{"id":106285,"date":"2026-09-17T01:48:26","date_gmt":"2026-09-16T17:48:26","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/106285.html"},"modified":"2026-09-17T01:48:26","modified_gmt":"2026-09-16T17:48:26","slug":"ch03-kotlin-%e9%80%9f%e6%88%90%ef%bc%88%e5%8f%aa%e5%ad%a6%e8%bf%99%e4%b8%aa%e9%a1%b9%e7%9b%ae%e7%94%a8%e5%88%b0%e7%9a%84%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/106285.html","title":{"rendered":"ch03 Kotlin \u901f\u6210\uff08\u53ea\u5b66\u8fd9\u4e2a\u9879\u76ee\u7528\u5230\u7684\uff09"},"content":{"rendered":"<p>\u5b66\u4e60\u76ee\u6807<br \/>\n\u8bfb\u5b8c\u672c\u7ae0&#xff0c;\u4f60\u5e94\u5f53\u80fd\u591f&#xff1a;<\/p>\n<li>\u8bf4\u6e05 val \u548c var \u7684\u533a\u522b&#xff0c;\u4ee5\u53ca\u4e3a\u4ec0\u4e48\u672c\u5de5\u7a0b\u9ed8\u8ba4\u5168\u7528 val&#xff1b;<\/li>\n<li>\u8bfb\u61c2\u5e76\u5199\u51fa\u7a7a\u5b89\u5168\u4e09\u4ef6\u5957 ? \/ ?. \/ ?:&#xff0c;\u5e76\u89e3\u91ca\u4e3a\u4ec0\u4e48\u672c\u5de5\u7a0b\u51e0\u4e4e\u4e0d\u7528 !!&#xff1b;<\/li>\n<li>\u7528 data class &#043; copy() \u505a&#034;\u4e0d\u53ef\u53d8\u66f4\u65b0&#034;&#xff0c;\u5e76\u8bf4\u6e05\u5b83\u548c&#034;\u539f\u5730\u6539\u5217\u8868&#034;\u5bf9 UI \u5237\u65b0\u7684\u5f71\u54cd&#xff1b;<\/li>\n<li>\u770b\u61c2 Context.dataStore \u8fd9\u79cd\u6269\u5c55\u5c5e\u6027\u548c by \u59d4\u6258&#xff0c;\u77e5\u9053\u5b83\u4e3a\u4ec0\u4e48\u80fd&#034;\u51ed\u7a7a\u591a\u51fa\u4e00\u4e2a\u5c5e\u6027&#034;&#xff1b;<\/li>\n<li>\u8bfb\u61c2 formatFileSize \u4e0e ThinkStripper \u91cc\u7684\u5faa\u73af\u4e0e\u96c6\u5408\u64cd\u4f5c&#xff0c;\u5e76\u80fd\u81ea\u5df1\u6539\u5199&#xff1b;<\/li>\n<li>\u7528 when \u5199\u5206\u652f&#xff0c;\u77e5\u9053\u5b83\u4e3a\u4ec0\u4e48\u6bd4 switch \u5f3a\u3001\u4ee5\u53ca\u5bc6\u5c01\u7c7b\u642d\u914d\u5b83\u7684\u7528\u6cd5&#xff1b;<\/li>\n<li>\u4eb2\u624b\u7ed9 ModelInfo \u52a0\u4e00\u4e2a\u5b57\u6bb5\u5e76\u8ba9\u5de5\u7a0b\u7f16\u8bd1\u901a\u8fc7\u2014\u2014\u8fd9\u662f\u672c\u7ae0\u7684\u901a\u5173\u9a8c\u8bc1\u3002<\/li>\n<p>\u524d\u7f6e&#xff1a;ch01\u3001ch02&#xff08;\u4f60\u5df2\u7ecf\u80fd\u628a\u5de5\u7a0b\u6784\u5efa\u8d77\u6765\u4e86&#xff09;<br \/>\n\u5bf9\u5e94\u6e90\u7801&#xff08;\u672c\u7ae0\u4f1a\u9010\u4e2a\u6253\u5f00&#xff09;&#xff1a;<\/p>\n<ul>\n<li>app\/src\/main\/java\/com\/example\/llama\/model\/ModelInfo.kt&#xff08;24 \u884c&#xff09;\u2014\u2014 \u88c5\u6570\u636e &#043; \u5de5\u5177\u51fd\u6570<\/li>\n<li>app\/src\/main\/java\/com\/example\/llama\/model\/Message.kt&#xff08;13 \u884c&#xff09;\u2014\u2014 \u6700\u5c0f\u7684 data class<\/li>\n<li>app\/src\/main\/java\/com\/example\/llama\/model\/ChatSession.kt&#xff08;22 \u884c&#xff09;\u2014\u2014 \u4e0d\u53ef\u53d8\u5217\u8868 &#043; \u65f6\u95f4\u6233<\/li>\n<li>app\/src\/main\/java\/com\/example\/llama\/util\/AppSettings.kt&#xff08;74 \u884c&#xff09;\u2014\u2014 \u6269\u5c55\u5c5e\u6027 &#043; Flow &#043; \u59d4\u6258<\/li>\n<li>app\/src\/main\/java\/com\/example\/llama\/util\/ThinkStripper.kt&#xff08;59 \u884c&#xff09;\u2014\u2014 \u5355\u4f8b &#043; \u6b63\u5219 &#043; \u5b57\u7b26\u4e32<\/li>\n<\/ul>\n<p>\u672c\u4e66 Kotlin \u7248\u672c&#xff1a;2.3.0&#xff08;\u89c1 gradle\/libs.versions.toml \u7684 kotlin &#061; &#034;2.3.0&#034;&#xff09;\u3002<\/p>\n<p><span class=\"token comment\">\/\/ Playground.kt \u2014\u2014 ch03 \u8bed\u6cd5\u70b9\u81ea\u5305\u542b\u793a\u4f8b<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4e0d\u4f9d\u8d56\u5de5\u7a0b\u7c7b&#xff0c;\u7eaf Kotlin\/JVM&#xff0c;\u7528 kotlinc \u5373\u53ef\u8fd0\u884c&#xff08;\u89c1 code\/ch03\/README.md&#xff09;\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6bcf\u4e2a\u5757\u5bf9\u5e94\u4e66\u91cc\u4e00\u4e2a\u5c0f\u8282\u3002<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#8212;&#8212;&#8212;- 3.2 val \/ var &#8212;&#8212;&#8212;-<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">demoValVar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u79bb\u7ebfAI&#034;<\/span><\/span>      <span class=\"token comment\">\/\/ \u53ea\u8bfb<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span>            <span class=\"token comment\">\/\/ \u8bfb\u5199<\/span><br \/>\n    count <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.2] name&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">name<\/span><\/span><span class=\"token string\"> count&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">count<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#8212;&#8212;&#8212;- 3.3 \u7a7a\u5b89\u5168 &#8212;&#8212;&#8212;-<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">demoNullSafety<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> b<span class=\"token operator\">:<\/span> String<span class=\"token operator\">?<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> lenSafe <span class=\"token operator\">&#061;<\/span> b<span class=\"token operator\">?<\/span><span class=\"token punctuation\">.<\/span>length        <span class=\"token comment\">\/\/ null \u5b89\u5168\u8c03\u7528 -&gt; null<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> lenElvis <span class=\"token operator\">&#061;<\/span> b<span class=\"token operator\">?<\/span><span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">?:<\/span> <span class=\"token number\">0<\/span>  <span class=\"token comment\">\/\/ Elvis \u515c\u5e95 -&gt; 0<\/span><br \/>\n    b <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;hello&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">val<\/span> lenReal <span class=\"token operator\">&#061;<\/span> b<span class=\"token operator\">?<\/span><span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">?:<\/span> <span class=\"token number\">0<\/span>   <span class=\"token comment\">\/\/ -&gt; 5<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.3] lenSafe&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">lenSafe<\/span><\/span><span class=\"token string\"> lenElvis&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">lenElvis<\/span><\/span><span class=\"token string\"> lenReal&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">lenReal<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#8212;&#8212;&#8212;- 3.4 data class &#043; copy &#8212;&#8212;&#8212;-<\/span><br \/>\n<span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">Message<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">val<\/span> content<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">val<\/span> isUser<span class=\"token operator\">:<\/span> Boolean<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">Session<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">val<\/span> title<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">val<\/span> messages<span class=\"token operator\">:<\/span> List<span class=\"token operator\">&lt;<\/span>Message<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">val<\/span> updatedAt<span class=\"token operator\">:<\/span> Long<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">fun<\/span> <span class=\"token function\">demoDataClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">Session<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u4f1a\u8bddA&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">emptyList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0L<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> newMsg <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">Message<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;m1&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u4f60\u597d&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e0d\u53ef\u53d8\u66f4\u65b0&#xff1a;copy \u751f\u6210\u65b0\u5bf9\u8c61&#xff0c;\u65e7\u5bf9\u8c61\u4e0d\u53d8<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> s2 <span class=\"token operator\">&#061;<\/span> s1<span class=\"token punctuation\">.<\/span><span class=\"token function\">copy<\/span><span class=\"token punctuation\">(<\/span>messages <span class=\"token operator\">&#061;<\/span> s1<span class=\"token punctuation\">.<\/span>messages <span class=\"token operator\">&#043;<\/span> newMsg<span class=\"token punctuation\">,<\/span> updatedAt <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1L<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.4] s1 \u6d88\u606f\u6570&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token expression\">s1<span class=\"token punctuation\">.<\/span>messages<span class=\"token punctuation\">.<\/span>size<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, s2 \u6d88\u606f\u6570&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token expression\">s2<span class=\"token punctuation\">.<\/span>messages<span class=\"token punctuation\">.<\/span>size<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.4] s1 &#061;&#061; s2 ? <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token expression\">s1 <span class=\"token operator\">&#061;&#061;<\/span> s2<\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ data class \u7684 equals \u6309\u5b57\u6bb5\u6bd4\u8f83 -&gt; false<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#8212;&#8212;&#8212;- 3.5 \u6269\u5c55\u51fd\u6570 &#8212;&#8212;&#8212;-<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> String<span class=\"token punctuation\">.<\/span><span class=\"token function\">shout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">uppercase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;!&#034;<\/span><\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">demoExtension<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.5] <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u79bb\u7ebfAI&#034;<\/span><\/span> <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">shout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#8212;&#8212;&#8212;- 3.6 \u96c6\u5408\u64cd\u4f5c &#8212;&#8212;&#8212;-<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">formatFileSize<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token operator\">:<\/span> Long<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>bytes <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u672a\u77e5\u5927\u5c0f&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">val<\/span> units <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">arrayOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;B&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;KB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;MB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;GB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;TB&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> unit <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1024.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">toInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">coerceIn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> units<span class=\"token punctuation\">.<\/span>lastIndex<span class=\"token punctuation\">)<\/span>   <span class=\"token comment\">\/\/ \u66ff\u4ee3 while&#xff1a;\u76f4\u63a5\u7b97\u7ea7\u6570<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> value <span class=\"token operator\">&#061;<\/span> bytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">pow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1024.0<\/span><span class=\"token punctuation\">,<\/span> unit<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;%.1f %s&#034;<\/span><\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">,<\/span> units<span class=\"token punctuation\">[<\/span>unit<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">demoCollections<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> tags <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&lt;think&gt;&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&lt;\/think&gt;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> best <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>tag <span class=\"token keyword\">in<\/span> tags<span class=\"token punctuation\">)<\/span> best <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">maxOf<\/span><span class=\"token punctuation\">(<\/span>best<span class=\"token punctuation\">,<\/span> tag<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.6] \u6700\u957f\u6807\u7b7e\u957f\u5ea6&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">best<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.6] 1_932_178_688 -&gt; <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token expression\"><span class=\"token function\">formatFileSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1_932_178_688L<\/span><span class=\"token punctuation\">)<\/span><\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ &#8212;&#8212;&#8212;- 3.7 when \u8868\u8fbe\u5f0f &#8212;&#8212;&#8212;-<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> THEME_SYSTEM <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> THEME_LIGHT <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> THEME_DARK <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">themeLabel<\/span><span class=\"token punctuation\">(<\/span>mode<span class=\"token operator\">:<\/span> Int<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">when<\/span> <span class=\"token punctuation\">(<\/span>mode<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token number\">0<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u8ddf\u968f\u7cfb\u7edf&#034;<\/span><\/span><br \/>\n    <span class=\"token number\">1<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u6d45\u8272&#034;<\/span><\/span><br \/>\n    <span class=\"token number\">2<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u6df1\u8272&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u672a\u77e5&#034;<\/span><\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">demoWhen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;[3.7] mode&#061;2 -&gt; <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span><span class=\"token expression\"><span class=\"token function\">themeLabel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><\/span><span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">fun<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">demoValVar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">demoNullSafety<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">demoDataClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">demoExtension<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">demoCollections<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">demoWhen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u5168\u90e8\u793a\u4f8b\u8fd0\u884c\u5b8c\u6bd5\u3002&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f9ed; \u8bfb\u672c\u7ae0\u524d&#xff0c;\u8bf7\u5148\u786e\u8ba4<\/p>\n<ul>\n<li>\u524d\u7f6e&#xff1a;ch01\u3001ch02&#xff08;\u5df2\u7ecf\u80fd\u6784\u5efa\u6210\u529f&#xff09;\u3002<\/li>\n<li>\u9700\u8981\u7684\u57fa\u7840&#xff1a;\u77e5\u9053&#034;\u53d8\u91cf\u3001\u51fd\u6570\u3001\u5faa\u73af&#034;\u662f\u4ec0\u4e48\u2014\u2014\u5982\u679c\u4e0d\u77e5\u9053&#xff0c;<br \/>\n\u5148\u8bfb\u9644\u5f55 A.1&#xff08;\u7ea6 10 \u5206\u949f&#xff09;\u3002\u4e0d\u9700\u8981\u4e8b\u5148\u5b66\u8fc7 Kotlin\u3002<\/li>\n<li>\u672c\u7ae0\u4f1a\u51fa\u73b0\u7684\u751f\u8bcd&#xff1a;val\/var\u3001\u7a7a\u5b89\u5168&#xff08;?. ?:&#xff09;\u3001data class\u3001copy\u3001<br \/>\n\u6269\u5c55\u51fd\u6570\u3001\u5c5e\u6027\u59d4\u6258&#xff08;by&#xff09;\u3001\u5355\u4f8b&#xff08;object&#xff09;\u3001when\u3001Lambda\u3002<br \/>\n\u4e00\u8d77\u67e5 \u9644\u5f55 B.2\u3002<\/li>\n<li>\u8bfb\u6cd5\u5efa\u8bae&#xff1a;\u8fd9\u662f\u5168\u4e66\u6700\u8be5\u6162\u8bfb\u7684\u4e00\u7ae0\u3002<br \/>\n\u4e0d\u8981\u8bd5\u56fe\u8bb0\u4f4f\u8bed\u6cd5\u2014\u2014\u53ea\u8bb0&#034;\u5b83\u5728\u5de5\u7a0b\u91cc\u957f\u4ec0\u4e48\u6837&#034;\u3002<br \/>\n\u6bcf\u770b\u5b8c\u4e00\u8282&#xff0c;\u5c31\u53bb\u5bf9\u5e94\u6587\u4ef6\u91cc\u627e\u5230\u90a3\u6bb5\u4ee3\u7801\u770b\u4e00\u773c&#xff08;\u672c\u7ae0\u90fd\u7ed9\u4e86\u6587\u4ef6\u8def\u5f84&#xff09;\u3002<br \/>\n\u6700\u540e\u4e00\u5b9a\u8981\u505a 3.10 \u7684\u52a8\u624b\u9a8c\u8bc1&#xff08;\u7ed9 ModelInfo \u52a0\u5b57\u6bb5\u5e76\u7f16\u8bd1\u901a\u8fc7&#xff09;&#xff0c;<br \/>\n\u90a3\u662f&#034;\u771f\u5b66\u4f1a\u4e86&#034;\u548c&#034;\u770b\u61c2\u4e86&#034;\u7684\u5206\u754c\u7ebf\u3002<\/li>\n<\/ul>\n<p>\u672c\u7ae0\u5bfc\u8bfb<br \/>\n\u4e0a\u4e00\u7ae0\u4f60\u628a\u5de5\u5177\u88c5\u597d\u4e86\u3001APK \u4e5f\u6253\u51fa\u6765\u4e86\u3002\u4f46\u6253\u5f00\u4efb\u610f\u4e00\u4e2a .kt \u6587\u4ef6&#xff0c;\u5927\u6982\u7387\u8fd8\u662f\u4e00\u8138\u61f5&#xff1a;<br \/>\nval\u3001Flow&lt;Float&gt;\u3001data class\u3001by\u3001?:\u3001object\u2026\u2026\u8fd9\u4e9b\u662f\u4ec0\u4e48&#xff1f;<\/p>\n<p>\u597d\u6d88\u606f\u662f&#xff1a;Kotlin \u662f\u4e00\u95e8\u5f88\u5927\u7684\u8bed\u8a00&#xff0c;\u4f46\u672c\u9879\u76ee\u53ea\u7528\u4e86\u5b83\u7684\u4e00\u4e2a\u5b50\u96c6\u3002<br \/>\n\u4f60\u4e0d\u9700\u8981\u5148\u5543\u5b8c\u4e00\u672c 800 \u9875\u7684 Kotlin \u8bed\u6cd5\u4e66\u518d\u56de\u6765\u770b\u5de5\u7a0b\u2014\u2014\u90a3\u6837\u6548\u7387\u6781\u4f4e&#xff0c;<br \/>\n\u56e0\u4e3a\u4e66\u91cc 80% \u7684\u7279\u6027\u672c\u9879\u76ee\u6839\u672c\u6ca1\u7528\u5230\u3002<\/p>\n<p>\u672c\u7ae0\u7684\u8bb2\u6cd5\u662f\u53cd\u8fc7\u6765\u7684&#xff1a;\u4ece\u5de5\u7a0b\u91cc\u771f\u5b9e\u51fa\u73b0\u7684\u90a3\u51e0\u884c\u4ee3\u7801\u51fa\u53d1&#xff0c;\u9047\u5230\u4ec0\u4e48\u8bed\u6cd5\u5c31\u8bb2\u4ec0\u4e48\u3002<\/p>\n<p>&#x1f4a1; \u7c7b\u6bd4<br \/>\n\u5b66\u5916\u8bed\u6709\u4e24\u79cd\u65b9\u6cd5&#xff1a;\u2460 \u80cc\u5b8c\u6574\u8bcd\u5178\u518d\u53bb\u8bfb\u5c0f\u8bf4&#xff1b;\u2461 \u62ff\u4e00\u672c\u5c0f\u8bf4\u8fb9\u8bfb\u8fb9\u67e5\u8bcd\u3002<br \/>\n\u672c\u7ae0\u7528\u7b2c \u2461 \u79cd\u2014\u2014\u4f60\u73b0\u5728\u624b\u91cc\u5df2\u7ecf\u6709&#034;\u5c0f\u8bf4&#034;&#xff08;\u672c\u5de5\u7a0b&#xff09;\u4e86&#xff0c;\u7f3a\u7684\u53ea\u662f\u67e5\u8bcd\u8868\u3002<br \/>\n\u8bfb\u5b8c\u672c\u7ae0\u4f60\u4f1a\u8ba4\u5f97\u5de5\u7a0b\u91cc\u7ea6 80% \u7684 Kotlin&#xff1b;\u5269\u4e0b 20%&#xff08;\u534f\u7a0b suspend\u3001Flow\u3001Composable&#xff09;<br \/>\n\u4e0d\u662f&#034;\u8bed\u6cd5&#034;\u800c\u662f&#034;\u600e\u4e48\u7ec4\u7ec7\u5f02\u6b65\u548c UI&#034;&#xff0c;\u4f1a\u5728 ch06 \u4e4b\u540e\u4e13\u95e8\u8bb2\u2014\u2014\u5b83\u4eec\u624d\u662f\u672c\u9879\u76ee\u771f\u6b63\u7684\u96be\u70b9\u3002<\/p>\n<hr \/>\n<h3>3.1 \u5148\u5efa\u7acb\u6b63\u786e\u9884\u671f&#xff1a;\u4f60\u4e0d\u7528\u5b66&#034;\u5168\u90e8 Kotlin&#034;<\/h3>\n<p>\u672c\u7ae0\u53ea\u8bb2\u516b\u5757&#xff0c;\u6bcf\u4e00\u5757\u90fd\u5bf9\u5e94\u5de5\u7a0b\u91cc\u771f\u5b9e\u5b58\u5728\u7684\u4ee3\u7801&#xff1a;<\/p>\n<table>\n<tr>\u4f60\u5c06\u5728\u672c\u7ae0\u5b66\u4f1a\u5de5\u7a0b\u91cc\u7684\u51fa\u5904<\/tr>\n<tbody>\n<tr>\n<td>val \/ var \u4e0e\u4e0d\u53ef\u53d8\u4f18\u5148<\/td>\n<td>ModelInfo\u3001Message\u3001ChatSession \u7684\u5b57\u6bb5<\/td>\n<\/tr>\n<tr>\n<td>\u7a7a\u5b89\u5168&#xff08;? \/ ?. \/ ?: \/ !!&#xff09;<\/td>\n<td>AppSettings \u7684 ?: \u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n<tr>\n<td>data class \u4e0e copy<\/td>\n<td>\u4e09\u4e2a model \u7c7b<\/td>\n<\/tr>\n<tr>\n<td>\u6269\u5c55\u51fd\u6570 \/ \u6269\u5c55\u5c5e\u6027<\/td>\n<td>Context.dataStore&#xff08;AppSettings.kt:21&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>by \u5c5e\u6027\u59d4\u6258<\/td>\n<td>by preferencesDataStore(&#8230;)<\/td>\n<\/tr>\n<tr>\n<td>\u51fd\u6570\u5f0f\u96c6\u5408\u64cd\u4f5c<\/td>\n<td>formatFileSize\u3001trailingPartialTagLength<\/td>\n<\/tr>\n<tr>\n<td>when \u8868\u8fbe\u5f0f<\/td>\n<td>AppSettings \u7684\u4e3b\u9898\u5e38\u91cf &#043; MainScreenState \u72b6\u6001\u673a&#xff08;ch09&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>object \u5355\u4f8b<\/td>\n<td>ThinkStripper<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4dd; \u6807\u8bb0\u8bf4\u660e&#xff1a;\u672c\u7ae0\u4ee3\u7801\u5757\u53f3\u4e0a\u89d2\u7684\u6807\u8bb0\u542b\u4e49\u2014\u2014<br \/>\n\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1\u3000\u2699\ufe0f \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u672a\u5728\u4e0a\u677f\u8fd0\u884c\u3000&#x1f4dd; \u793a\u4f8b&#xff08;\u9700\u81ea\u884c\u9a8c\u8bc1&#xff09;<\/p>\n<hr \/>\n<h3>3.2 \u7f16\u7a0b\u6700\u57fa\u672c\u7684\u56db\u4ef6\u4e8b&#xff08;\u4ece\u6ca1\u5199\u8fc7\u4ee3\u7801\u4e5f\u522b\u614c&#xff09;<\/h3>\n<p>\u5982\u679c\u4f60\u4ece\u6ca1\u5199\u8fc7\u4ee3\u7801&#xff0c;\u5148\u522b\u6025\u7740\u80cc\u8bed\u6cd5\u3002\u7a0b\u5e8f\u8fd9\u4ef6\u4e8b\u8bf4\u7a7f\u4e86\u53ea\u6709\u6700\u57fa\u672c\u7684\u51e0\u4ef6\u4e8b&#xff0c;<br \/>\n\u628a\u8fd9\u4e00\u8282\u8bfb\u5b8c&#xff0c;\u540e\u9762\u6240\u6709\u8bed\u6cd5\u90fd\u53ea\u662f\u5728\u7ed9\u8fd9\u51e0\u4ef6\u4e8b&#034;\u8d34\u6807\u7b7e\u3001\u52a0\u5305\u88c5&#034;\u3002<\/p>\n<p>\u2460 \u7a0b\u5e8f &#061; \u6570\u636e &#043; \u64cd\u4f5c<br \/>\n\u6570\u636e\u662f&#034;\u662f\u4ec0\u4e48&#034;&#xff08;\u6bd4\u5982\u4e00\u4e2a\u6a21\u578b\u7684\u540d\u5b57\u3001\u5927\u5c0f&#xff09;&#xff0c;\u64cd\u4f5c\u662f&#034;\u505a\u4ec0\u4e48&#034;&#xff08;\u6bd4\u5982\u628a\u5b57\u8282\u6570\u7b97\u6210 MB\u3001\u5265\u6389\u601d\u8003\u6807\u7b7e&#xff09;\u3002<br \/>\n\u5199\u7a0b\u5e8f\u5c31\u662f&#xff1a;\u628a\u6570\u636e\u6446\u597d&#xff0c;\u7136\u540e\u5b89\u6392\u4e00\u8fde\u4e32\u64cd\u4f5c\u53bb\u5904\u7406\u5b83\u3002<\/p>\n<p>&#x1f4dd; <span class=\"token number\">1536000.0<\/span>          <span class=\"token comment\">\/\/ \u8fd9\u662f\u4e00\u4e2a&#034;\u6570\u636e&#034;<\/span><br \/>\nsize <span class=\"token operator\">\/<\/span> <span class=\"token number\">1024<\/span>           <span class=\"token comment\">\/\/ \u8fd9\u662f\u4e00\u4e2a&#034;\u64cd\u4f5c&#034;&#xff1a;\u628a\u6570\u636e\u9664\u4ee5 1024<\/span><\/p>\n<p>\u2461 \u53d8\u91cf &#061; \u7ed9\u6570\u636e\u8d34\u540d\u5b57\u7684\u6807\u7b7e<br \/>\n\u5149\u628a\u6570\u636e\u5199\u5728\u4ee3\u7801\u91cc&#xff0c;\u4e0b\u6b21\u60f3\u7528\u5c31\u627e\u4e0d\u5230\u4e86\u3002\u53d8\u91cf\u5c31\u662f\u7ed9\u6570\u636e\u8d34\u4e00\u4e2a\u6807\u7b7e&#xff0c;<br \/>\n\u4ee5\u540e\u558a\u6807\u7b7e\u540d&#xff0c;\u8ba1\u7b97\u673a\u5c31\u628a\u6807\u7b7e\u4e0b\u9762\u7684\u90a3\u4efd\u6570\u636e\u9012\u7ed9\u4f60\u3002<br \/>\n\u7c7b\u6bd4&#xff1a;\u62bd\u5c49\u4e0a\u8d34\u7740\u5199\u6709&#034;\u6a21\u578b\u5927\u5c0f&#034;\u7684\u7eb8\u6761\u2014\u2014\u4f60\u4e0d\u7528\u8bb0\u62bd\u5c49\u957f\u4ec0\u4e48\u6837&#xff0c;\u558a\u540d\u5b57\u5c31\u80fd\u62ff\u5230\u91cc\u9762\u7684\u4e1c\u897f\u3002<\/p>\n<p>&#x1f4dd; <span class=\"token keyword\">val<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1536000.0<\/span>   <span class=\"token comment\">\/\/ \u628a\u6570\u636e 1536000.0 \u8d34\u4e0a\u6807\u7b7e size<\/span><br \/>\nsize <span class=\"token operator\">\/<\/span> <span class=\"token number\">1024<\/span>               <span class=\"token comment\">\/\/ \u4ee5\u540e\u5199 size&#xff0c;\u5c31\u662f\u5728\u558a\u90a3\u4e2a\u6807\u7b7e<\/span><\/p>\n<p>\u2462 \u7c7b\u578b &#061; \u6570\u636e\u7684&#034;\u5f62\u72b6&#034;<br \/>\n\u6bcf\u4e2a\u6570\u636e\u90fd\u6709\u81ea\u5df1\u7684\u5f62\u72b6&#xff1a;\u6574\u6570\u662f&#034;\u80fd\u52a0\u51cf\u7684\u6570\u5b57&#034;&#xff0c;\u5b57\u7b26\u4e32\u662f&#034;\u4e00\u6bb5\u6587\u5b57&#034;\u3002<br \/>\n\u5f62\u72b6\u4e0d\u540c&#xff0c;\u80fd\u505a\u7684\u64cd\u4f5c\u5c31\u4e0d\u540c\u2014\u2014\u4f60\u4e0d\u80fd\u5bf9\u4e00\u53e5\u95ee\u5019\u8bed\u505a\u9664\u6cd5\u3002<br \/>\n\u7c7b\u6bd4&#xff1a;\u5706\u5f62\u63d2\u5b54\u63d2\u4e0d\u8fdb\u65b9\u5f62\u63d2\u5934&#xff0c;\u7c7b\u578b\u4e00\u4e0d\u914d\u5bf9&#xff0c;\u7f16\u8bd1\u5668\u5f53\u573a\u62a5\u8b66\u3002<\/p>\n<p>&#x1f4dd; <span class=\"token keyword\">val<\/span> n<span class=\"token operator\">:<\/span> Int <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1024<\/span>        <span class=\"token comment\">\/\/ Int &#061; \u6574\u6570&#xff0c;\u80fd\u52a0\u51cf\u4e58\u9664<\/span><br \/>\n<span class=\"token keyword\">val<\/span> s<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u79bb\u7ebfAI&#034;<\/span><\/span>    <span class=\"token comment\">\/\/ String &#061; \u4e00\u6bb5\u6587\u5b57&#xff0c;\u80fd\u62fc\u63a5\u3001\u80fd\u53d6\u957f\u5ea6<\/span><\/p>\n<p>\u2463 \u51fd\u6570 &#061; \u8d77\u4e86\u540d\u5b57\u7684\u4e00\u4e32\u64cd\u4f5c<br \/>\n\u4e00\u4e2a\u529f\u80fd\u5f80\u5f80\u8981\u597d\u51e0\u6b65\u64cd\u4f5c\u624d\u5b8c\u6210&#xff08;\u6bd4\u5982&#034;\u663e\u793a\u6587\u4ef6\u5927\u5c0f&#034;\u8981\u9664\u597d\u51e0\u6b21 1024 \u518d\u52a0\u5355\u4f4d&#xff09;\u3002<br \/>\n\u628a\u8fd9\u4e00\u4e32\u64cd\u4f5c\u6253\u5305\u3001\u8d77\u4e2a\u540d\u5b57&#xff0c;\u4ee5\u540e\u6309\u4e00\u4e0b\u8fd9\u4e2a\u540d\u5b57\u5c31\u6574\u5957\u6267\u884c\u3002<br \/>\n\u7c7b\u6bd4&#xff1a;\u6d17\u8863\u673a\u4e0a\u7684&#034;\u6807\u51c6\u6d17&#034;\u6309\u94ae\u2014\u2014\u6309\u4e00\u4e0b\u5c31\u81ea\u52a8\u6267\u884c\u6d17\u3001\u6f02\u3001\u8131\u4e09\u6b65&#xff0c;<br \/>\n\u4f60\u4e0d\u7528\u6bcf\u6b21\u90fd\u624b\u52a8\u5b89\u6392\u8fd9\u4e09\u6b65\u3002<\/p>\n<p>&#x1f4dd; <span class=\"token keyword\">fun<\/span> \u683c\u5f0f\u5316<span class=\"token punctuation\">(<\/span>\u5b57\u8282<span class=\"token operator\">:<\/span> Long<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u4e00\u8fde\u4e32\u64cd\u4f5c\u6253\u5305\u5728\u8fd9\u91cc\u9762 *\/<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;1.5 MB&#034;<\/span><\/span> <span class=\"token punctuation\">}<\/span><br \/>\n\u683c\u5f0f\u5316<span class=\"token punctuation\">(<\/span><span class=\"token number\">1536000<\/span><span class=\"token punctuation\">)<\/span>          <span class=\"token comment\">\/\/ \u6309\u4e00\u4e0b\u6309\u94ae&#xff0c;\u91cc\u9762\u90a3\u4e32\u64cd\u4f5c\u81ea\u52a8\u8dd1\u5b8c<\/span><\/p>\n<p>\u2464 \u8bed\u53e5\u6309\u987a\u5e8f\u6267\u884c<br \/>\n\u8ba1\u7b97\u673a\u4e0d\u4f1a&#034;\u731c\u4f60\u60f3\u5e72\u4ec0\u4e48&#034;\u3002\u5199\u5728\u524d\u9762\u7684\u8bed\u53e5\u5148\u6267\u884c&#xff0c;\u5199\u5728\u540e\u9762\u7684\u540e\u6267\u884c&#xff0c;<br \/>\n\u4e00\u6b65\u63a5\u4e00\u6b65&#xff0c;\u9664\u975e\u9047\u5230\u5faa\u73af\u3001\u5206\u652f\u8fd9\u79cd\u4e13\u95e8\u6539\u53d8\u987a\u5e8f\u7684\u7ed3\u6784&#xff08;\u672c\u7ae0\u540e\u9762\u4f1a\u8bb2&#xff09;\u3002<br \/>\n\u8bfb\u4ee3\u7801\u65f6\u8bb0\u4f4f&#xff1a;\u4ece\u4e0a\u5f80\u4e0b\u8bfb&#xff0c;\u5c31\u662f\u8ba1\u7b97\u673a\u771f\u6b63\u5e72\u6d3b\u7684\u987a\u5e8f\u3002<\/p>\n<p>&#x1f4cc; \u9644\u5f55 A.1 \u6709\u66f4\u8be6\u7ec6\u7684\u5c55\u5f00&#xff0c;\u672c\u7ae0\u53ea\u9700\u7406\u89e3\u5230\u8fd9\u4e2a\u7a0b\u5ea6\u5c31\u80fd\u5f80\u4e0b\u8bfb\u3002<\/p>\n<hr \/>\n<h3>3.3 val \/ var&#xff1a;\u4e0d\u53ef\u53d8\u4f18\u5148<\/h3>\n<h4>3.3.1 \u8fd9\u662f\u4ec0\u4e48\u3001\u4e3a\u4ec0\u4e48\u9700\u8981<\/h4>\n<p>\u8fd9\u662f\u4ec0\u4e48&#xff08;\u5927\u767d\u8bdd&#xff09;&#xff1a;\u53d8\u91cf\u5c31\u662f 3.2 \u8bb2\u7684&#034;\u8d34\u4e86\u540d\u5b57\u7684\u6570\u636e\u6807\u7b7e&#034;\u3002<br \/>\nKotlin \u91cc\u8d34\u6807\u7b7e\u53ea\u6709\u4e24\u79cd\u5199\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">val<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u79bb\u7ebfAI&#034;<\/span><\/span>   <span class=\"token comment\">\/\/ val &#061; value&#xff0c;\u53ea\u8bfb&#xff1b;\u8d4b\u503c\u540e\u4e0d\u80fd\u518d\u6539&#xff08;\u7c7b\u4f3c Java \u7684 final&#xff09;<\/span><br \/>\n<span class=\"token keyword\">var<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span>         <span class=\"token comment\">\/\/ var &#061; variable&#xff0c;\u53ef\u8bfb\u5199<\/span><\/p>\n<p>\u8bd5\u7740\u7ed9 val \u91cd\u65b0\u8d4b\u503c\u4f1a\u7f16\u8bd1\u4e0d\u8fc7&#xff08;\u8fd9\u662f\u597d\u4e8b&#xff0c;\u9519\u8bef\u88ab\u62e6\u5728\u7f16\u8bd1\u671f&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">val<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u79bb\u7ebfAI&#034;<\/span><\/span><br \/>\nname <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u522b\u7684&#034;<\/span><\/span>          <span class=\"token comment\">\/\/ \u274c \u7f16\u8bd1\u9519\u8bef<\/span><\/p>\n<p>\u4f60\u4f1a\u770b\u5230&#xff1a;<\/p>\n<p>error: val cannot be reassigned<\/p>\n<p>\u4e3a\u4ec0\u4e48\u8981\u5206 val \u548c var \u4e24\u79cd&#xff1f;<br \/>\n\u56e0\u4e3a\u4ee3\u7801\u91cc\u6709\u4e00\u534a\u6570\u636e\u4f60\u538b\u6839\u4e0d\u5e0c\u671b\u5b83\u88ab\u6539&#xff08;\u6bd4\u5982\u4e00\u4e2a\u6a21\u578b\u7684 id\u3001\u540d\u5b57&#xff09;\u2014\u2014<br \/>\n\u5199\u6210 val&#xff0c;\u8c01\u8981\u662f\u624b\u6ed1\u6539\u4e86&#xff0c;\u7f16\u8bd1\u5668\u7acb\u523b\u62e6\u4e0b&#xff1b;<br \/>\n\u53e6\u4e00\u534a\u672c\u6765\u5c31\u8981\u53d8&#xff08;\u6bd4\u5982\u5faa\u73af\u8ba1\u6570\u3001\u7d2f\u52a0\u7684\u4f53\u79ef\u503c&#xff09;&#xff0c;\u624d\u7528 var\u3002<br \/>\nKotlin \u7684\u9009\u62e9\u662f&#xff1a;\u9ed8\u8ba4\u5168\u90e8 val&#xff0c;\u771f\u7684\u9700\u8981\u53d8\u624d\u7528 var&#xff08;\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u9009&#xff0c;3.3.3 \u8bb2&#xff09;\u3002<\/p>\n<p>&#x1f4a1; val \u4e0d\u4ee3\u8868&#034;\u5bf9\u8c61\u5185\u5bb9\u4e0d\u53ef\u53d8&#034;&#xff0c;\u53ea\u4ee3\u8868&#034;\u8fd9\u4e2a\u53d8\u91cf\u4e0d\u80fd\u6307\u5411\u522b\u7684\u5bf9\u8c61&#034;\u3002<br \/>\n\u7c7b\u6bd4&#xff1a;val \u50cf\u628a\u9065\u63a7\u5668\u7528\u80f6\u6c34\u7c98\u5728\u8336\u51e0\u4e0a\u2014\u2014\u4f60\u4e0d\u80fd\u6362\u9065\u63a7\u5668&#xff08;\u53d8\u91cf\u4e0d\u80fd\u91cd\u65b0\u6307\u5411&#xff09;&#xff0c;<br \/>\n\u4f46\u9065\u63a7\u5668\u4e0a\u7684\u6309\u94ae\u4f60\u8fd8\u662f\u80fd\u6309&#xff08;\u5bf9\u8c61\u5185\u90e8\u7684\u72b6\u6001\u53ef\u80fd\u53ef\u53d8&#xff09;\u3002<br \/>\n\u771f\u6b63&#034;\u5185\u5bb9\u4e5f\u4e0d\u53ef\u53d8&#034;\u8981\u9760 data class &#043; \u5168 val \u5b57\u6bb5 &#043; \u4e0d\u53ef\u53d8\u96c6\u5408&#xff08;\u89c1 3.5&#xff09;\u3002<\/p>\n<h4>3.3.2 \u5de5\u7a0b\u91cc\u600e\u4e48\u7528<\/h4>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 model\/ModelInfo.kt:3-11<\/p>\n<p><span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">ModelInfo<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> name<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> path<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> size<span class=\"token operator\">:<\/span> Long <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> isLoaded<span class=\"token operator\">:<\/span> Boolean <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> architecture<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> quantization<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u9010\u884c\u62c6\u5f00\u770b&#xff1a;<\/p>\n<table>\n<tr>\u884c\u4ee3\u7801\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>3<\/td>\n<td>data class ModelInfo(<\/td>\n<td>\u58f0\u660e\u4e00\u4e2a\u6570\u636e\u7c7b&#xff08;3.5 \u8be6\u8bb2&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>val id: String,<\/td>\n<td>\u552f\u4e00\u6807\u8bc6&#xff0c;\u5fc5\u586b&#xff08;\u65e0\u9ed8\u8ba4\u503c&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>val name: String,<\/td>\n<td>\u6a21\u578b\u540d&#xff0c;\u5fc5\u586b<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>val path: String,<\/td>\n<td>\u6587\u4ef6\u8def\u5f84&#xff0c;\u5fc5\u586b<\/td>\n<\/tr>\n<tr>\n<td>7<\/td>\n<td>val size: Long &#061; 0,<\/td>\n<td>\u5b57\u8282\u6570&#xff0c;\u6709\u9ed8\u8ba4\u503c 0<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>val isLoaded: Boolean &#061; false,<\/td>\n<td>\u662f\u5426\u5df2\u52a0\u8f7d&#xff0c;\u9ed8\u8ba4 false<\/td>\n<\/tr>\n<tr>\n<td>9-10<\/td>\n<td>val architecture: String &#061; &#034;&#034; \u7b49<\/td>\n<td>\u67b6\u6784 \/ \u91cf\u5316\u4fe1\u606f&#xff0c;\u9ed8\u8ba4\u7a7a\u4e32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5168\u662f val&#xff0c;\u6ca1\u6709\u4e00\u4e2a\u662f var\u3002\u8fd9\u4e0d\u662f\u5de7\u5408&#xff0c;\u800c\u662f\u5de5\u7a0b\u60ef\u4f8b&#xff1a;<br \/>\n\u4e00\u4e2a\u6a21\u578b\u7684\u4fe1\u606f\u4e00\u65e6\u6784\u9020\u51fa\u6765&#xff0c;\u5c31\u4e0d\u8be5\u88ab\u968f\u4fbf\u6539\u5b57\u6bb5\u3002\u9700\u8981&#034;\u6539&#034;\u7684\u65f6\u5019&#xff0c;\u7528 copy&#xff08;3.5 \u8bb2&#xff09;\u3002<\/p>\n<p>\u26a0\ufe0f \u6ce8\u610f&#034;\u5fc5\u586b vs \u6709\u9ed8\u8ba4\u503c&#034;\u8fd9\u4e2a\u533a\u522b\u2014\u2014\u5b83\u76f4\u63a5\u51b3\u5b9a\u4f60 new \u4e00\u4e2a\u5bf9\u8c61\u65f6\u8981\u4f20\u51e0\u4e2a\u53c2\u6570&#xff1a;<\/p>\n<p><span class=\"token function\">ModelInfo<\/span><span class=\"token punctuation\">(<\/span>id <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;m1&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;Hy-MT2&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> path <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\/sdcard\/x.gguf&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span>   <span class=\"token comment\">\/\/ \u2705 \u540e\u56db\u4e2a\u7528\u9ed8\u8ba4\u503c<\/span><br \/>\n<span class=\"token function\">ModelInfo<\/span><span class=\"token punctuation\">(<\/span>id <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;m1&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;Hy-MT2&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span>                            <span class=\"token comment\">\/\/ \u274c \u5c11\u4f20 path<\/span><\/p>\n<p>\u8fd9\u4e2a\u8bbe\u8ba1\u5728 3.10 \u7684\u52a8\u624b\u9a8c\u8bc1\u91cc\u4f1a\u53d8\u6210\u4f60\u7684&#034;\u4fdd\u62a4\u4f1e&#034;\u3002<\/p>\n<h4>3.3.3 \u4e3a\u4ec0\u4e48&#034;\u4e0d\u53ef\u53d8\u4f18\u5148&#034;<\/h4>\n<p>\u5728\u591a\u7ebf\u7a0b \/ \u534f\u7a0b\u73af\u5883\u91cc&#xff0c;\u4e0d\u53ef\u53d8\u5bf9\u8c61\u5929\u7136\u6ca1\u6709&#034;\u8bfb\u5199\u7ade\u4e89&#034;\u95ee\u9898&#xff1a;<br \/>\n\u4e24\u4e2a\u534f\u7a0b\u540c\u65f6\u8bfb\u4e00\u4e2a\u4e0d\u4f1a\u53d8\u7684\u5bf9\u8c61&#xff0c;\u4e0d\u53ef\u80fd\u8bfb\u5230&#034;\u6539\u5230\u4e00\u534a&#034;\u7684\u72b6\u6001\u3002<\/p>\n<p>\u672c\u9879\u76ee\u5927\u91cf\u4f7f\u7528\u534f\u7a0b&#xff08;ch08&#xff09;&#xff0c;\u804a\u5929\u8bb0\u5f55\u3001\u6a21\u578b\u5217\u8868\u90fd\u5728\u534f\u7a0b\u91cc\u4f20\u9012\u3002<br \/>\n\u5982\u679c\u8fd9\u4e9b\u5bf9\u8c61\u662f var \u53ef\u53d8\u7684&#xff0c;\u4f60\u5c31\u5f97\u5904\u5904\u52a0\u9501\u3002\u7528 val &#043; copy&#xff0c;\u95ee\u9898\u76f4\u63a5\u6d88\u5931\u3002<\/p>\n<hr \/>\n<h3>3.4 \u7a7a\u5b89\u5168&#xff1a;Kotlin \u6700\u6709\u540d\u7684\u7279\u6027<\/h3>\n<h4>3.4.1 \u95ee\u9898\u4ece\u54ea\u6765<\/h4>\n<p>\u5728 Java&#xff08;\u4ee5\u53ca\u5f88\u591a\u8bed\u8a00&#xff09;\u91cc&#xff0c;null \u662f\u4e2a\u5de8\u5927\u7684\u5751&#xff1a;<\/p>\n<p><span class=\"token class-name\">String<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\ns<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u7f16\u8bd1\u80fd\u8fc7&#xff0c;\u8fd0\u884c\u65f6\u70b8&#xff1a;NullPointerException&#xff08;NPE&#xff09;<\/span><\/p>\n<p>\u8fd9\u4e2a\u9519\u8bef\u53ea\u5728\u8fd0\u884c\u65f6\u624d\u66b4\u9732&#xff0c;\u800c\u4e14\u7ecf\u5e38\u5728\u4f60\u6700\u60f3\u4e0d\u5230\u7684\u5730\u65b9\u70b8\u3002<br \/>\n\u4e1a\u754c\u628a\u5b83\u79f0\u4e3a&#034;\u5341\u4ebf\u7f8e\u5143\u7684\u9519\u8bef&#034;\u3002<\/p>\n<h4>3.4.2 Kotlin \u7684\u89e3\u6cd5&#xff1a;\u628a&#034;\u80fd\u4e0d\u80fd\u4e3a null&#034;\u5199\u8fdb\u7c7b\u578b<\/h4>\n<p><span class=\"token keyword\">var<\/span> a<span class=\"token operator\">:<\/span> String  <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;hi&#034;<\/span><\/span>    <span class=\"token comment\">\/\/ \u975e\u7a7a\u7c7b\u578b&#xff1a;\u4e0d\u80fd\u8d4b null<\/span><br \/>\n<span class=\"token keyword\">var<\/span> b<span class=\"token operator\">:<\/span> String<span class=\"token operator\">?<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span>    <span class=\"token comment\">\/\/ \u53ef\u7a7a\u7c7b\u578b&#xff1a;\u7c7b\u578b\u540e\u9762\u591a\u4e2a ?<\/span><\/p>\n<p>\u5173\u952e\u533a\u522b\u5728\u7c7b\u578b\u540e\u9762\u90a3\u4e2a\u95ee\u53f7&#xff1a;<\/p>\n<ul>\n<li>String \u2014\u2014 \u6211\u4fdd\u8bc1\u5b83\u6c38\u8fdc\u4e0d\u662f null<\/li>\n<li>String? \u2014\u2014 \u5b83\u53ef\u80fd\u662f null&#xff0c;\u4f60\u5fc5\u987b\u5904\u7406<\/li>\n<\/ul>\n<p>\u8bd5\u7740\u8fdd\u53cd\u5b83&#xff0c;\u7f16\u8bd1\u5668\u7acb\u523b\u62e6\u4f4f&#xff1a;<\/p>\n<p><span class=\"token keyword\">var<\/span> a<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;hi&#034;<\/span><\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span>                 <span class=\"token comment\">\/\/ \u274c \u7f16\u8bd1\u9519\u8bef<\/span><\/p>\n<p><span class=\"token keyword\">var<\/span> b<span class=\"token operator\">:<\/span> String<span class=\"token operator\">?<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><br \/>\n<span class=\"token keyword\">val<\/span> len <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">.<\/span>length       <span class=\"token comment\">\/\/ \u274c \u7f16\u8bd1\u9519\u8bef<\/span><\/p>\n<p>\u7b2c\u4e8c\u6761\u4f60\u4f1a\u770b\u5230&#xff1a;<\/p>\n<p>error: only safe (?.) or non-null asserted (!!.) calls are allowed<br \/>\non a nullable receiver of type String?<\/p>\n<h4>3.4.3 \u4e09\u4ef6\u5957&#xff1a;?. \/ ?: \/ !!<\/h4>\n<p>\u5bf9\u53ef\u7a7a\u7c7b\u578b&#xff0c;\u6709\u4e09\u4e2a\u5de5\u5177&#xff1a;<\/p>\n<table>\n<tr>\u5199\u6cd5\u540d\u5b57\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>b?.length<\/td>\n<td>\u5b89\u5168\u8c03\u7528<\/td>\n<td>\u5982\u679c b \u4e0d\u662f null \u5c31\u53d6 length&#xff1b;\u662f null \u5c31\u6574\u4e2a\u8868\u8fbe\u5f0f\u8fd4\u56de null&#xff0c;\u4e0d\u5d29<\/td>\n<\/tr>\n<tr>\n<td>b?.length ?: 0<\/td>\n<td>Elvis \u8fd0\u7b97\u7b26<\/td>\n<td>\u5de6\u8fb9\u4e3a null \u65f6&#xff0c;\u7528\u53f3\u8fb9\u7684\u503c\u515c\u5e95<\/td>\n<\/tr>\n<tr>\n<td>b!!.length<\/td>\n<td>\u975e\u7a7a\u65ad\u8a00<\/td>\n<td>\u201c\u6211\u53d1\u8a93\u5b83\u4e0d\u662f null\u201d\u2014\u2014\u53d1\u8a93\u9519\u4e86\u5c31 NPE \u5d29\u6e83<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7ec4\u5408\u8d77\u6765\u7684\u6548\u679c&#xff08;b \u662f String?&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">val<\/span> len1 <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">.<\/span>length          <span class=\"token comment\">\/\/ \u274c \u7f16\u8bd1\u9519\u8bef<\/span><br \/>\n<span class=\"token keyword\">val<\/span> len2 <span class=\"token operator\">&#061;<\/span> b<span class=\"token operator\">?<\/span><span class=\"token punctuation\">.<\/span>length         <span class=\"token comment\">\/\/ \u2705 \u7c7b\u578b\u53d8\u6210 Int?&#xff08;\u53ef\u80fd null&#xff09;<\/span><br \/>\n<span class=\"token keyword\">val<\/span> len3 <span class=\"token operator\">&#061;<\/span> b<span class=\"token operator\">?<\/span><span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">?:<\/span> <span class=\"token number\">0<\/span>    <span class=\"token comment\">\/\/ \u2705 \u7c7b\u578b\u53d8\u6210 Int&#xff08;null \u65f6\u7528 0&#xff09;<\/span><\/p>\n<p>&#x1f4a1; Elvis \u4e3a\u4ec0\u4e48\u53eb Elvis&#xff1f;<br \/>\n\u56e0\u4e3a ?: \u4fa7\u8fc7\u6765\u770b\u50cf\u732b\u738b&#xff08;Elvis Presley&#xff09;\u7684\u98de\u673a\u5934\u548c\u773c\u775b\u3002\u8fd9\u662f Kotlin \u5b98\u65b9\u7684\u51b7\u7b11\u8bdd\u3002<\/p>\n<h4>3.4.4 \u5de5\u7a0b\u91cc\u6700\u5178\u578b\u7684\u7528\u6cd5<\/h4>\n<p>\u26a0\ufe0f \u5148\u6253\u4e2a\u9884\u9632\u9488&#xff1a;\u4e0b\u9762\u8fd9\u884c\u91cc\u7684 context.dataStore.data.map { &#8230; } \u662f ch08 \u624d\u6559\u7684&#034;\u5f02\u6b65\u6570\u636e\u6d41&#xff08;Flow&#xff09;\u201c&#xff0c;<br \/>\n\u73b0\u5728\u5b8c\u5168\u4e0d\u7528\u61c2\u5b83\u3002\u4f60\u53ea\u9700\u8981\u628a\u5b83\u6574\u4f53\u5f53\u6210&#034;\u4e00\u4e2a\u53ef\u80fd\u4e3a null \u7684\u503c\u201d&#xff0c;<br \/>\n\u773c\u775b\u53ea\u76ef\u4f4f ?: \u8fd9\u4e00\u4e2a\u7b26\u53f7\u600e\u4e48\u7528\u3002<br \/>\n\u6015\u6df7\u6dc6\u7684\u8bdd&#xff0c;\u5148\u770b\u8fd9\u4e2a &#x1f4dd; \u6700\u5c0f\u7248\u672c\u2014\u2014\u5b83\u548c\u5de5\u7a0b\u4ee3\u7801\u91cc\u7684 ?: \u7528\u6cd5\u4e00\u6a21\u4e00\u6837&#xff1a;<\/p>\n<p>&#x1f4dd; <span class=\"token keyword\">val<\/span> name <span class=\"token operator\">&#061;<\/span> userInput <span class=\"token operator\">?:<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u9ed8\u8ba4\u540d&#034;<\/span><\/span>   <span class=\"token comment\">\/\/ userInput \u53ef\u80fd\u662f null&#xff1b;\u662f null \u5c31\u7528 &#034;\u9ed8\u8ba4\u540d&#034;<\/span><\/p>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 util\/AppSettings.kt:32<\/p>\n<p><span class=\"token keyword\">val<\/span> temperature<span class=\"token operator\">:<\/span> Flow<span class=\"token operator\">&lt;<\/span>Float<span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">&#061;<\/span> context<span class=\"token punctuation\">.<\/span>dataStore<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span> <span class=\"token punctuation\">{<\/span> it<span class=\"token punctuation\">[<\/span>TEMP_KEY<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">?:<\/span> DEFAULT_TEMPERATURE <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u62c6\u5f00\u770b\u8fd9\u4e00\u884c\u4e3a\u4ec0\u4e48\u53eb&#034;\u7a7a\u5b89\u5168\u6559\u79d1\u4e66&#034;&#xff1a;<\/p>\n<table>\n<tr>\u7247\u6bb5\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>context.dataStore.data<\/td>\n<td>\u4e00\u4e2a\u6570\u636e\u6d41&#xff08;Flow&#xff09;&#xff0c;\u6bcf\u6b21\u8bbe\u7f6e\u53d8\u5316\u4f1a\u91cd\u65b0\u53d1\u503c<\/td>\n<\/tr>\n<tr>\n<td>.map { &#8230; }<\/td>\n<td>\u628a\u6d41\u91cc\u7684\u6bcf\u4e2a\u5143\u7d20\u505a\u4e00\u6b21\u8f6c\u6362<\/td>\n<\/tr>\n<tr>\n<td>it<\/td>\n<td>Lambda \u7684\u9690\u5f0f\u53c2\u6570\u540d&#xff0c;\u8fd9\u91cc\u6307&#034;\u6d41\u91cc\u7684\u90a3\u4e2a\u5143\u7d20&#034;&#xff08;\u4e00\u4e2a Preferences \u5bf9\u8c61&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>it[TEMP_KEY]<\/td>\n<td>\u6309\u952e\u53d6\u503c\u3002\u7c7b\u578b\u662f Float?\u2014\u2014\u53ef\u80fd\u6ca1\u5b58\u8fc7\u8fd9\u4e2a\u503c<\/td>\n<\/tr>\n<tr>\n<td>?: DEFAULT_TEMPERATURE<\/td>\n<td>\u6ca1\u5b58\u8fc7\u5c31\u7528\u9ed8\u8ba4\u6e29\u5ea6 0.3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u540c\u6837\u7684\u6a21\u5f0f\u5728\u8fd9\u51e0\u884c\u91cd\u590d\u51fa\u73b0&#xff08;\u2705 \u540c\u6587\u4ef6&#xff09;&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ AppSettings.kt:35<\/span><br \/>\n<span class=\"token keyword\">val<\/span> topP<span class=\"token operator\">:<\/span> Flow<span class=\"token operator\">&lt;<\/span>Float<span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">&#061;<\/span> context<span class=\"token punctuation\">.<\/span>dataStore<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span> <span class=\"token punctuation\">{<\/span> it<span class=\"token punctuation\">[<\/span>TOP_P_KEY<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">?:<\/span> DEFAULT_TOP_P <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ AppSettings.kt:38<\/span><br \/>\n<span class=\"token keyword\">val<\/span> topK<span class=\"token operator\">:<\/span> Flow<span class=\"token operator\">&lt;<\/span>Int<span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">&#061;<\/span> context<span class=\"token punctuation\">.<\/span>dataStore<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span> <span class=\"token punctuation\">{<\/span> it<span class=\"token punctuation\">[<\/span>TOP_K_KEY<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">?:<\/span> DEFAULT_TOP_K <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ AppSettings.kt:41<\/span><br \/>\n<span class=\"token keyword\">val<\/span> predictLength<span class=\"token operator\">:<\/span> Flow<span class=\"token operator\">&lt;<\/span>Int<span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">&#061;<\/span> context<span class=\"token punctuation\">.<\/span>dataStore<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span> <span class=\"token punctuation\">{<\/span> it<span class=\"token punctuation\">[<\/span>PREDICT_KEY<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">?:<\/span> DEFAULT_PREDICT_LENGTH <span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f4cc; \u8bb0\u4f4f\u8fd9\u4e2a\u5957\u8def&#xff1a;\u8bfb\u4e00\u4e2a\u53ef\u80fd\u4e0d\u5b58\u5728\u7684\u503c ?: \u9ed8\u8ba4\u503c\u3002\u672c\u9879\u76ee\u91cc\u5230\u5904\u90fd\u662f&#xff0c;<br \/>\n\u5b83\u8ba9\u4f60&#034;\u6c38\u8fdc\u4e0d\u5fc5\u5199 if (x &#061;&#061; null)&#034;\u3002<\/p>\n<h4>3.4.5 \u4e3a\u4ec0\u4e48\u672c\u5de5\u7a0b\u51e0\u4e4e\u4e0d\u7528 !!<\/h4>\n<p>!! \u7684\u610f\u601d\u662f&#034;\u6211\u4fdd\u8bc1\u4e0d\u4e3a null&#xff0c;\u5426\u5219\u4f60\u5d29\u7ed9\u6211\u770b&#034;\u3002\u5b83\u628a\u7f16\u8bd1\u671f\u9519\u8bef\u63a8\u8fdf\u6210\u8fd0\u884c\u65f6\u5d29\u6e83&#xff0c;<br \/>\n\u6070\u6070\u662f Kotlin \u60f3\u6d88\u706d\u7684\u4e1c\u897f\u3002<\/p>\n<p>\u672c\u5de5\u7a0b\u91cc\u51e0\u4e4e\u770b\u4e0d\u5230 !!\u3002 \u4f60\u4e5f\u5e94\u8be5\u517b\u6210\u4e60\u60ef&#xff1a;\u770b\u5230 !! \u5148\u95ee\u81ea\u5df1<br \/>\n\u201c\u6211\u771f\u7684\u80fd\u4fdd\u8bc1\u5417&#xff1f;\u80fd\u4e0d\u80fd\u7528 ?. \u6216 ?: \u4ee3\u66ff&#xff1f;\u201d<\/p>\n<hr \/>\n<h3>3.5 data class \u4e0e copy&#xff1a;\u88c5\u6570\u636e\u5c31\u7528\u5b83<\/h3>\n<h4>3.5.1 \u8fd9\u662f\u4ec0\u4e48\u3001\u4e3a\u4ec0\u4e48\u9700\u8981<\/h4>\n<p>\u8fd9\u662f\u4ec0\u4e48&#xff08;\u5927\u767d\u8bdd&#xff09;&#xff1a;\u51e1\u662f&#034;\u4e3b\u8981\u7528\u6765\u88c5\u6570\u636e&#034;\u7684\u7c7b&#xff0c;\u90fd\u7528 data class\u3002\u5b83\u81ea\u52a8\u5e2e\u4f60\u751f\u6210\u56db\u4e2a\u4e1c\u897f&#xff1a;<br \/>\nequals()\u3001hashCode()\u3001toString()&#xff0c;\u4ee5\u53ca\u4e00\u4e2a copy()\u3002<\/p>\n<p>\u5148\u628a\u8fd9\u56db\u4e2a\u81ea\u52a8\u751f\u6210\u7684\u4e1c\u897f\u8bf4\u4eba\u8bdd&#xff1a;<\/p>\n<ul>\n<li>equals()&#xff1a;\u5224\u65ad&#034;\u4e24\u4e2a\u5bf9\u8c61\u88c5\u7684\u5185\u5bb9\u662f\u4e0d\u662f\u76f8\u540c&#034;\u3002<br \/>\n\u6bd4\u5982\u4e24\u6761 Message \u7684 id\u3001content\u3001isUser \u90fd\u4e00\u6837&#xff0c;m1 &#061;&#061; m2 \u5c31\u8fd4\u56de true\u3002<\/li>\n<li>hashCode()&#xff1a;\u7ed9\u5bf9\u8c61\u7b97\u4e00\u4e2a&#034;\u5feb\u901f\u7f16\u53f7&#034;&#xff0c;\u65b9\u4fbf\u628a\u5b83\u653e\u8fdb HashMap\u3001HashSet \u8fd9\u7c7b\u5bb9\u5668\u91cc\u5feb\u901f\u67e5\u627e\u3002<br \/>\n\u5185\u5bb9\u76f8\u540c\u7684\u5bf9\u8c61\u5fc5\u987b\u7b97\u51fa\u76f8\u540c\u7684\u7f16\u53f7&#xff0c;\u5426\u5219 HashMap \u4f1a\u8ba4\u9519\u4e1c\u897f\u3002<\/li>\n<li>toString()&#xff1a;\u628a\u5bf9\u8c61\u8f6c\u6210\u4e00\u6bb5\u6587\u5b57\u65b9\u4fbf\u6253\u5370\u3002<br \/>\n\u4e0d\u5199\u5b83&#xff0c;println(message) \u53ea\u4f1a\u6253\u51fa\u4e00\u4e32\u4e71\u7801\u822c\u7684\u5185\u5b58\u5730\u5740&#xff1b;\u5199\u4e86\u5b83&#xff0c;<br \/>\n\u6253\u51fa\u6765\u662f Message(id&#061;m1, content&#061;\u4f60\u597d, isUser&#061;true)\u2014\u2014\u8c03\u8bd5\u65f6\u80fd\u6551\u547d\u3002<\/li>\n<li>copy()&#xff1a;\u590d\u5236\u4e00\u4efd\u3001\u53ea\u6539\u4f60\u60f3\u6539\u7684\u5b57\u6bb5&#xff08;3.5.4 \u8be6\u8bb2&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u4e3a\u4ec0\u4e48\u9700\u8981&#xff08;\u6ca1\u6709\u5b83\u8981\u624b\u5199\u591a\u5c11&#xff09;&#xff1a;\u4e0d\u7528 data class \u7684\u8bdd&#xff0c;\u4e0a\u9762\u56db\u4e2a\u65b9\u6cd5\u4f60\u5f97\u4e00\u4e2a\u4e00\u4e2a\u624b\u5199&#xff0c;<br \/>\n\u5927\u7ea6 30 \u884c\u6837\u677f\u4ee3\u7801&#xff0c;\u800c\u4e14\u624b\u5199\u5f88\u5bb9\u6613\u5199\u9519&#xff08;\u6bd4\u5982 equals \u6f0f\u6bd4\u4e00\u4e2a\u5b57\u6bb5&#xff09;\u3002<br \/>\n\u4e0b\u9762\u662f\u540c\u4e00\u4e2a Message \u7684\u4e24\u4e2a\u7248\u672c&#xff0c;\u5bf9\u7167\u7740\u770b&#xff1a;<\/p>\n<p>&#x1f4dd; \u4e0d\u7528 data class \u7684\u624b\u5199\u7248&#xff08;\u7ea6 30 \u884c&#xff0c;\u53ea\u4e3a\u8ba9\u4f60\u611f\u53d7&#034;\u6837\u677f\u4ee3\u7801&#034;\u6709\u591a\u70e6&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token function\">Message<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> content<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> isUser<span class=\"token operator\">:<\/span> Boolean<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">fun<\/span> <span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>other<span class=\"token operator\">:<\/span> Any<span class=\"token operator\">?<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> Boolean <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span> <span class=\"token operator\">&#061;&#061;&#061;<\/span> other<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>other <span class=\"token operator\">!<\/span><span class=\"token keyword\">is<\/span> Message<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> id <span class=\"token operator\">&#061;&#061;<\/span> other<span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">&amp;&amp;<\/span> content <span class=\"token operator\">&#061;&#061;<\/span> other<span class=\"token punctuation\">.<\/span>content <span class=\"token operator\">&amp;&amp;<\/span> isUser <span class=\"token operator\">&#061;&#061;<\/span> other<span class=\"token punctuation\">.<\/span>isUser<br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">fun<\/span> <span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> Int <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">var<\/span> result <span class=\"token operator\">&#061;<\/span> id<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        result <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">31<\/span> <span class=\"token operator\">*<\/span> result <span class=\"token operator\">&#043;<\/span> content<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        result <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">31<\/span> <span class=\"token operator\">*<\/span> result <span class=\"token operator\">&#043;<\/span> isUser<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> result<br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">override<\/span> <span class=\"token keyword\">fun<\/span> <span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span><br \/>\n        <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;Message(id&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">id<\/span><\/span><span class=\"token string\">, content&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">content<\/span><\/span><span class=\"token string\">, isUser&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">$<\/span><span class=\"token expression\">isUser<\/span><\/span><span class=\"token string\">)&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">copy<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id<span class=\"token punctuation\">,<\/span> content<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>content<span class=\"token punctuation\">,<\/span><br \/>\n             isUser<span class=\"token operator\">:<\/span> Boolean <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>isUser<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">Message<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">,<\/span> content<span class=\"token punctuation\">,<\/span> isUser<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f4dd; Kotlin \u7684 data class \u7248&#xff08;\u4e0a\u9762 30 \u884c\u7684\u5168\u90e8\u6548\u679c&#xff0c;\u53ea\u8981 5 \u884c&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">Message<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> content<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> isUser<span class=\"token operator\">:<\/span> Boolean<br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5de5\u7a0b\u771f\u8eab&#xff1a;\u4e0b\u4e00\u8282 3.5.2 \u5c31\u662f\u5de5\u7a0b\u91cc\u771f\u5b9e\u7684 Message\u3002<\/p>\n<h4>3.5.2 \u5de5\u7a0b\u91cc\u6700\u5c0f\u7684\u4f8b\u5b50<\/h4>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 model\/Message.kt:9-13<\/p>\n<p><span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">Message<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> content<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> isUser<span class=\"token operator\">:<\/span> Boolean<br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u4e09\u4e2a\u5b57\u6bb5&#xff1a;\u552f\u4e00 ID\u3001\u5185\u5bb9\u3001\u662f\u4e0d\u662f\u7528\u6237\u53d1\u7684\u3002\u5c31\u8fd9\u4e9b\u3002<\/p>\n<p>&#x1f4cc; \u987a\u5e26\u770b\u4e00\u773c\u4e0a\u9762\u7684\u6ce8\u91ca&#xff08;\u540c\u6587\u4ef6 3-8 \u884c&#xff09;&#xff0c;\u5b83\u8bb0\u5f55\u4e86\u4e00\u6b21\u771f\u5b9e\u7684\u91cd\u6784&#xff1a;<br \/>\n\u8fd9\u4e2a\u7c7b\u539f\u5148\u5b9a\u4e49\u5728 MessageAdapter.kt \u91cc&#xff0c;\u540e\u6765\u968f RecyclerView \u9002\u914d\u5668\u4e00\u8d77\u5220\u6389\u3001\u8fc1\u79fb\u5230 model \u5305&#xff0c;<br \/>\n\u76ee\u7684\u662f\u8ba9 UI \u5c42\u53ea\u4f9d\u8d56 model \u5305\u3002\u8bfb\u5de5\u7a0b\u6ce8\u91ca\u7ecf\u5e38\u80fd\u6316\u5230\u8fd9\u79cd&#034;\u4e3a\u4ec0\u4e48\u8fd9\u6837\u8bbe\u8ba1&#034;\u7684\u4fe1\u606f&#xff0c;\u503c\u5f97\u517b\u6210\u4e60\u60ef\u3002<\/p>\n<h4>3.5.3 \u5e26\u5217\u8868\u7684\u4f8b\u5b50<\/h4>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 model\/ChatSession.kt:16-22<\/p>\n<p><span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">ChatSession<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> title<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> messages<span class=\"token operator\">:<\/span> List<span class=\"token operator\">&lt;<\/span>Message<span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> createdAt<span class=\"token operator\">:<\/span> Long<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> updatedAt<span class=\"token operator\">:<\/span> Long<br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6ce8\u610f messages: List&lt;Message&gt; \u2014\u2014 \u8fd9\u91cc\u7684 &lt;Message&gt; \u662f\u6cdb\u578b&#xff08;generic&#xff09;&#xff0c;\u610f\u601d\u662f&#034;\u8fd9\u662f\u4e00\u4e2a\u4e13\u95e8\u88c5 Message \u7684\u5217\u8868&#034;\u3002\u4f60\u53ef\u4ee5\u8bfb\u6210&#034;\u88c5\u6d88\u606f\u7684\u5217\u8868&#034;\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u9700\u8981\u6cdb\u578b&#xff1f; \u60f3\u8c61\u4e00\u4e2a\u6ca1\u8d34\u6807\u7b7e\u7684\u7a7a\u7bb1\u5b50&#xff1a;\u4f60\u5f80\u91cc\u585e\u82f9\u679c\u3001\u585e\u6a58\u5b50\u3001\u585e\u4e66\u90fd\u53ef\u4ee5&#xff0c;<br \/>\n\u4f46\u7b49\u4f60\u4f38\u624b\u53bb\u53d6\u7684\u65f6\u5019&#xff0c;\u6839\u672c\u4e0d\u77e5\u9053\u8fd9\u6b21\u62ff\u5230\u7684\u662f\u82f9\u679c\u8fd8\u662f\u6a58\u5b50\u2014\u2014\u53ea\u80fd\u9760\u731c&#xff0c;\u731c\u9519\u4e86\u5c31\u62a5\u9519\u3002<br \/>\n&lt;Message&gt; \u5c31\u662f\u8d34\u5728\u7bb1\u5b50\u4e0a\u7684\u6807\u7b7e&#xff1a;\u201c\u8fd9\u4e2a\u7bb1\u5b50\u53ea\u51c6\u653e Message\u201d\u3002<br \/>\n\u4f60\u8981\u662f\u60f3\u5f80\u91cc\u585e\u4e00\u4e2a String&#xff0c;\u7f16\u8bd1\u5668\u5f53\u573a\u62e6\u4f4f&#xff1b;\u4f60\u4ece\u91cc\u9762\u53d6\u4e1c\u897f\u65f6&#xff0c;<br \/>\n\u7f16\u8bd1\u5668\u4e5f\u77e5\u9053&#034;\u8fd9\u4e00\u5b9a\u662f Message&#034;&#xff0c;\u4e0d\u7528\u4f60\u518d\u505a&#034;\u7c7b\u578b\u8f6c\u6362&#034;\u8fd9\u9053\u731c\u6d4b\u5de5\u5e8f\u3002<br \/>\nKotlin \u7684 List \u9ed8\u8ba4\u662f\u53ea\u8bfb\u7684&#xff08;\u6ca1\u6709 add\/remove&#xff09;\u3002<br \/>\n\u8981\u53ef\u53d8\u5217\u8868\u5fc5\u987b\u663e\u5f0f\u5199 MutableList\u3002\u8fd9\u662f Kotlin \u5728\u7c7b\u578b\u5c42\u9762\u5e2e\u4f60\u9632\u9519\u3002<\/p>\n<p>\u540c\u6587\u4ef6\u4e0a\u65b9\u8fd8\u6709\u4e00\u6bb5\u5f88\u6709\u4ef7\u503c\u7684 KDoc&#xff08;3-15 \u884c&#xff09;&#xff0c;\u89e3\u91ca\u4e86\u591a\u4f1a\u8bdd\u529f\u80fd&#xff08;F2&#xff09;\u4e3a\u4ec0\u4e48\u9700\u8981\u8fd9\u4e2a\u7c7b&#xff0c;<br \/>\n\u4ee5\u53ca updatedAt \u7684\u7528\u9014\u662f\u4f1a\u8bdd\u5217\u8868\u6392\u5e8f\u3002<\/p>\n<h4>3.5.4 copy&#xff1a;\u6539\u4e00\u4e2a\u5b57\u6bb5\u3001\u5176\u4f59\u4e0d\u53d8<\/h4>\n<p>\u56e0\u4e3a\u5b57\u6bb5\u5168\u662f val\u3001\u5217\u8868\u662f\u53ea\u8bfb List&#xff0c;\u8981&#034;\u52a0\u4e00\u6761\u6d88\u606f&#034;\u4e0d\u80fd\u8fd9\u4e48\u5199&#xff1a;<\/p>\n<p>session<span class=\"token punctuation\">.<\/span>messages<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>newMessage<span class=\"token punctuation\">)<\/span>     <span class=\"token comment\">\/\/ \u274c List \u6ca1\u6709 add<\/span><\/p>\n<p>\u6b63\u786e\u505a\u6cd5\u662f\u7528 copy \u751f\u6210\u4e00\u4e2a\u65b0\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token keyword\">val<\/span> updated <span class=\"token operator\">&#061;<\/span> session<span class=\"token punctuation\">.<\/span><span class=\"token function\">copy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    messages <span class=\"token operator\">&#061;<\/span> session<span class=\"token punctuation\">.<\/span>messages <span class=\"token operator\">&#043;<\/span> newMessage<span class=\"token punctuation\">,<\/span><br \/>\n    updatedAt <span class=\"token operator\">&#061;<\/span> System<span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u9010\u6bb5\u89e3\u91ca&#xff1a;<\/p>\n<table>\n<tr>\u7247\u6bb5\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>session.copy(&#8230;)<\/td>\n<td>\u590d\u5236\u4e00\u4efd&#xff0c;copy \u7684\u53c2\u6570\u90fd\u662f\u53ef\u9009\u7684&#xff0c;\u53ea\u4f20\u4f60\u60f3\u6539\u7684<\/td>\n<\/tr>\n<tr>\n<td>messages &#061; session.messages &#043; newMessage<\/td>\n<td>&#043; \u5bf9 List \u662f&#034;\u8fd4\u56de\u4e00\u4e2a\u65b0\u5217\u8868&#034;&#xff0c;\u539f\u5217\u8868\u4e0d\u53d8<\/td>\n<\/tr>\n<tr>\n<td>updatedAt &#061; System.currentTimeMillis()<\/td>\n<td>\u987a\u624b\u66f4\u65b0\u6700\u540e\u4fee\u6539\u65f6\u95f4<\/td>\n<\/tr>\n<tr>\n<td>\u672a\u63d0\u5230\u7684 id\/title\/createdAt<\/td>\n<td>\u539f\u6837\u4fdd\u7559<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u53eb\u4e0d\u53ef\u53d8\u66f4\u65b0&#xff1a;\u65e7 session \u4e00\u70b9\u6ca1\u53d8&#xff0c;\u4f60\u5f97\u5230\u4e00\u4e2a\u65b0\u5bf9\u8c61 updated\u3002<\/p>\n<h4>3.5.5 \u4e3a\u4ec0\u4e48\u975e\u8981\u8fd9\u6837&#xff1f;\u2014\u2014\u56e0\u4e3a\u5b83\u51b3\u5b9a\u4e86 UI \u5237\u4e0d\u5237\u65b0<\/h4>\n<p>\u8fd9\u662f\u672c\u7ae0\u6700\u91cd\u8981\u7684\u4e00\u4e2a\u8ba4\u77e5&#xff0c;\u8bf7\u52a1\u5fc5\u7406\u89e3&#xff1a;<\/p>\n<p>&#x1f4dd; Compose \u9760&#034;\u5f15\u7528\u662f\u5426\u53d8\u4e86&#034;\u6765\u5224\u65ad\u8981\u4e0d\u8981\u91cd\u753b UI&#xff08;ch06 \u8be6\u8bb2&#xff09;\u3002<br \/>\n\u5982\u679c\u4f60\u539f\u5730\u6539\u5217\u8868&#xff08;mutableList.add(&#8230;)&#xff09;&#xff0c;\u5217\u8868\u8fd8\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61&#xff0c;<br \/>\nCompose \u770b\u4e0d\u51fa\u53d8\u5316 \u2192 \u754c\u9762\u4e0d\u5237\u65b0&#xff0c;\u4f60\u4f1a\u770b\u5230&#034;\u6570\u636e\u53d8\u4e86\u4f46\u5c4f\u5e55\u6ca1\u53d8&#034;\u7684\u8be1\u5f02 bug\u3002<\/p>\n<p>copy &#043; &#043; \u4f1a\u4ea7\u751f\u65b0\u7684\u5bf9\u8c61\u5f15\u7528&#xff0c;Compose \u7acb\u523b\u53d1\u73b0&#034;\u54e6&#xff0c;\u53d8\u4e86&#034;&#xff0c;\u4e8e\u662f\u91cd\u753b\u3002<\/p>\n<p>\u6240\u4ee5&#034;\u4e0d\u53ef\u53d8\u66f4\u65b0&#034;\u4e0d\u662f\u8bed\u6cd5\u6d01\u7656&#xff0c;\u800c\u662f\u8ba9 UI \u6b63\u5e38\u5de5\u4f5c\u7684\u5fc5\u8981\u6761\u4ef6\u3002<br \/>\nch09 \u8bb2 MainScreenState \u65f6\u4f1a\u770b\u5230&#xff0c;\u6574\u4e2a\u804a\u5929\u8bb0\u5f55\u7684\u66f4\u65b0\u90fd\u5efa\u7acb\u5728\u8fd9\u4e2a\u624b\u6cd5\u4e0a\u3002<\/p>\n<hr \/>\n<h3>3.6 \u6269\u5c55\u51fd\u6570 \/ \u6269\u5c55\u5c5e\u6027&#xff1a;\u7ed9\u73b0\u6709\u7c7b&#034;\u52a0\u65b9\u6cd5&#034;\u800c\u4e0d\u6539\u5b83<\/h3>\n<h4>3.6.1 \u8fd9\u662f\u4ec0\u4e48\u3001\u4e3a\u4ec0\u4e48\u9700\u8981<\/h4>\n<p>Kotlin \u5141\u8bb8\u4f60\u7ed9\u4e00\u4e2a\u5df2\u7ecf\u5b58\u5728\u7684\u7c7b\u6dfb\u52a0\u51fd\u6570\u6216\u5c5e\u6027\u2014\u2014\u54ea\u6015\u8fd9\u4e2a\u7c7b\u4e0d\u662f\u4f60\u5199\u7684\u3001\u4f60\u6ca1\u6709\u6e90\u7801<br \/>\n&#xff08;\u6bd4\u5982 Android \u6846\u67b6\u7684 Context&#xff09;\u3002\u5199\u6cd5\u662f\u5728\u540d\u5b57\u524d\u9762\u52a0 \u7c7b\u540d.&#xff1a;<\/p>\n<p>\u4e3a\u4ec0\u4e48\u9700\u8981\u5b83&#xff1f; \u4f60\u5199 App \u65f6\u4f1a\u9891\u7e41\u7528\u5230 Android \u6846\u67b6\u7684 Context\u3001String\u3001List \u8fd9\u4e9b\u7c7b&#xff0c;<br \/>\n\u4f46\u5b83\u4eec\u662f Google \u5199\u597d\u7684\u9ed1\u76d2&#xff1a;\u4f60\u6539\u4e0d\u4e86\u6e90\u7801&#xff0c;\u4e5f\u6ca1\u6cd5\u7ed9\u5b83\u4eec&#034;\u52a0\u4e2a\u65b0\u65b9\u6cd5&#034;\u3002<br \/>\n\u6269\u5c55\u51fd\u6570\u5c31\u662f\u8ba9\u4f60\u5728\u4e0d\u78b0\u539f\u7c7b\u7684\u524d\u63d0\u4e0b&#xff0c;\u50cf\u7ed9\u5b83\u52a0\u4e86\u4e2a\u6210\u5458\u4e00\u6837\u8c03\u7528\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u7ed9 String \u52a0\u4e00\u4e2a\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> String<span class=\"token punctuation\">.<\/span><span class=\"token function\">stripThink<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> ThinkStripper<span class=\"token punctuation\">.<\/span><span class=\"token function\">strip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e4b\u540e\u5c31\u80fd\u8fd9\u4e48\u7528<\/span><br \/>\n<span class=\"token keyword\">val<\/span> cleaned <span class=\"token operator\">&#061;<\/span> rawText<span class=\"token punctuation\">.<\/span><span class=\"token function\">stripThink<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u51fd\u6570\u4f53\u91cc\u7684 this \u6307&#034;\u88ab\u6269\u5c55\u7684\u90a3\u4e2a\u5bf9\u8c61&#034;\u3002<\/p>\n<h4>3.6.2 \u5de5\u7a0b\u91cc\u6700\u7cbe\u5f69\u7684\u4e00\u5904<\/h4>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 util\/AppSettings.kt:21<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> Context<span class=\"token punctuation\">.<\/span>dataStore <span class=\"token keyword\">by<\/span> <span class=\"token function\">preferencesDataStore<\/span><span class=\"token punctuation\">(<\/span>name <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;app_settings&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd9\u4e00\u884c\u5e72\u4e86\u4e09\u4ef6\u4e8b&#xff0c;\u6bcf\u4e00\u4ef6\u90fd\u503c\u5f97\u7ec6\u770b&#xff1a;<\/p>\n<p>\u2460 Context.dataStore \u2014\u2014 \u8fd9\u662f\u6269\u5c55\u5c5e\u6027\u3002<br \/>\n\u5b83\u7ed9 Android \u7684 Context \u7c7b\u52a0\u4e86\u4e00\u4e2a\u53eb dataStore \u7684\u5c5e\u6027\u3002<br \/>\n\u4e4b\u540e\u5728\u8fd9\u4e2a\u6587\u4ef6\u91cc&#xff0c;context.dataStore \u5c31\u80fd\u76f4\u63a5\u7528&#xff08;\u89c1 3.4.4 \u90a3\u4e9b context.dataStore.data&#xff09;\u3002<\/p>\n<p>\u2461 by preferencesDataStore(name &#061; &#8230;) \u2014\u2014 \u8fd9\u662f\u5c5e\u6027\u59d4\u6258\u3002<br \/>\nby \u7684\u610f\u601d\u662f&#xff1a;\u201c\u6211\u4e0d\u81ea\u5df1\u5b9e\u73b0\u8fd9\u4e2a\u5c5e\u6027&#xff0c;\u628a\u2019\u600e\u4e48\u5f97\u5230\u5b83\u2019\u4ea4\u7ed9\u53f3\u8fb9\u90a3\u4e2a\u4e1c\u897f\u3002\u201d<br \/>\npreferencesDataStore(&#8230;) \u662f DataStore \u5e93\u63d0\u4f9b\u7684\u59d4\u6258&#xff0c;\u5b83\u8d1f\u8d23&#xff1a;<\/p>\n<ul>\n<li>\u521b\u5efa DataStore&#xff1b;<\/li>\n<li>\u4fdd\u8bc1\u540c\u4e00\u4e2a name \u53ea\u521b\u5efa\u4e00\u6b21&#xff08;\u8fdb\u7a0b\u5185\u5355\u4f8b&#xff09;&#xff1b;<\/li>\n<li>\u5904\u7406\u597d\u7ebf\u7a0b\u5b89\u5168\u3002<\/li>\n<\/ul>\n<p>\u4f60\u53ea\u5199&#034;\u6211\u8981\u4e00\u4e2a\u53eb app_settings \u7684 DataStore&#034;&#xff0c;\u5176\u4f59\u5168\u4ea4\u7ed9\u5e93\u3002<\/p>\n<p>\u2462 private \u2014\u2014 \u53ea\u5728\u672c\u6587\u4ef6\u5185\u53ef\u89c1\u3002<br \/>\n\u5916\u90e8\u62ff\u4e0d\u5230 context.dataStore&#xff0c;\u53ea\u80fd\u901a\u8fc7 AppSettings \u7684\u516c\u5f00\u65b9\u6cd5\u8bbf\u95ee\u3002\u8fd9\u662f\u5c01\u88c5\u3002<\/p>\n<p>&#x1f4a1; \u4e3a\u4ec0\u4e48\u53eb&#034;\u6269\u5c55&#034;\u800c\u4e0d\u662f&#034;\u7ee7\u627f&#034;&#xff1f;<br \/>\n\u56e0\u4e3a\u4f60\u6ca1\u6709 Context \u7684\u6e90\u7801&#xff0c;\u4e5f\u4e0d\u53ef\u80fd\u8ba9\u6240\u6709 Context \u7684\u5b9e\u73b0\u7c7b\u90fd\u53bb\u7ee7\u627f\u4f60\u7684\u5b50\u7c7b\u3002<br \/>\n\u6269\u5c55\u8ba9\u4f60&#034;\u5728\u4e0d\u78b0\u539f\u7c7b\u7684\u524d\u63d0\u4e0b&#xff0c;\u50cf\u7ed9\u5b83\u52a0\u6210\u5458\u4e00\u6837\u8c03\u7528&#034;\u3002<br \/>\n\u8fd9\u662f Kotlin \u5199 Android \u6700\u8212\u670d\u7684\u7279\u6027\u4e4b\u4e00\u2014\u2014Android \u6846\u67b6\u91cc\u904d\u5730\u662f&#034;\u60f3\u52a0\u4e2a\u65b9\u6cd5\u5374\u6539\u4e0d\u4e86&#034;\u7684\u7c7b\u3002<\/p>\n<h4>3.6.3 \u59d4\u6258\u7684\u53e6\u4e00\u79cd\u5e38\u89c1\u5f62\u5f0f<\/h4>\n<p>by \u5728\u672c\u4e66\u91cc\u8fd8\u4f1a\u4ee5\u53e6\u4e00\u79cd\u5f62\u5f0f\u51fa\u73b0&#xff08;ch04 \u4f1a\u89c1\u5230&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> mainState<span class=\"token operator\">:<\/span> MainScreenState <span class=\"token keyword\">by<\/span> <span class=\"token function\">viewModels<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u610f\u601d\u662f&#034;\u628a\u83b7\u53d6 ViewModel \u8fd9\u4ef6\u4e8b\u59d4\u6258\u7ed9 viewModels() \u8fd9\u4e2a\u51fd\u6570&#034;\u3002<br \/>\n\u770b\u5230 by&#xff0c;\u5c31\u60f3\u6210&#034;\u8fd9\u4e2a\u4e1c\u897f\u7684\u83b7\u53d6\/\u5b58\u50a8\u903b\u8f91\u4ea4\u7ed9\u522b\u4eba\u4e86&#034;\u3002<\/p>\n<hr \/>\n<h3>3.7 \u51fd\u6570\u5f0f\u96c6\u5408\u64cd\u4f5c&#xff1a;\u5c11\u5199\u5faa\u73af<\/h3>\n<p>Kotlin \u7684\u96c6\u5408\u6709\u4e00\u5806\u597d\u7528\u7684\u9ad8\u9636\u51fd\u6570&#xff08;\u63a5\u53d7\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u7684\u51fd\u6570&#xff09;\u3002\u672c\u9879\u76ee\u89c4\u6a21\u4e0d\u5927&#xff0c;\u4f46\u4e0b\u9762\u8fd9\u4e9b\u90fd\u7528\u5230\u4e86\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u9700\u8981\u5b83&#xff1f; \u904d\u5386\u4e00\u4e2a\u5217\u8868\u505a&#034;\u9010\u4e2a\u52a0\u5de5 \/ \u6311\u51fa\u7b26\u5408\u6761\u4ef6\u7684 \/ \u627e\u7b2c\u4e00\u4e2a&#034;&#xff0c;<br \/>\n\u5982\u679c\u624b\u5199 for \u5faa\u73af&#xff0c;\u6bcf\u6b21\u90fd\u8981\u5148\u5907\u597d\u4e00\u4e2a\u4e34\u65f6\u5bb9\u5668\u3001\u518d\u5199\u5faa\u73af\u3001\u518d\u5f80\u91cc\u585e\u2014\u2014<br \/>\n\u4e09\u884c\u6d3b\u7f29\u6210\u4e00\u884c\u51fd\u6570\u8c03\u7528&#xff0c;\u8bfb\u4ee3\u7801\u7684\u4eba\u4e00\u773c\u5c31\u770b\u51fa\u610f\u56fe&#xff08;map \u5c31\u662f&#034;\u9010\u4e2a\u53d8\u6362&#034;&#xff0c;filter \u5c31\u662f&#034;\u6311\u51fa\u6765&#034;&#xff09;\u3002<\/p>\n<p>&#x1f9d2; \u5148\u8865\u4e00\u8bfe&#xff1a;Lambda&#xff08;\u533f\u540d\u51fd\u6570&#xff09;\u548c&#034;\u9ad8\u9636\u51fd\u6570&#034;\u662f\u4ec0\u4e48&#xff1f; \u5982\u679c\u4f60\u4ece\u6ca1\u5199\u8fc7\u4ee3\u7801&#xff0c;\u8fd9\u91cc\u9700\u8981\u505c\u4e00\u4e0b\u3002<\/p>\n<ul>\n<li>\u51fd\u6570 &#061; \u4e00\u6bb5\u8d77\u4e86\u540d\u5b57\u3001\u80fd\u53cd\u590d\u8c03\u7528\u7684\u64cd\u4f5c&#xff08;\u9644\u5f55 A.1.3 \u8bb2\u8fc7&#xff09;\u3002<\/li>\n<li>Lambda &#061; \u4e00\u6bb5\u6ca1\u8d77\u540d\u5b57\u3001\u4e34\u65f6\u585e\u5728\u522b\u4eba\u62ec\u53f7\u91cc\u7684\u5c0f\u64cd\u4f5c&#xff0c;\u5199\u6cd5\u662f { \u5b83 -&gt; \u505a\u4ec0\u4e48 }\u3002\u4f60\u53ef\u4ee5\u60f3\u6210&#034;\u4e00\u5f20\u5199\u7740\u4e34\u65f6\u505a\u6cd5\u7684\u5c0f\u7eb8\u6761&#xff0c;\u9012\u7ed9\u522b\u4eba\u5e2e\u4f60\u6267\u884c&#034;\u3002<\/li>\n<li>\u9ad8\u9636\u51fd\u6570 &#061; \u63a5\u6536\u8fd9\u5f20\u7eb8\u6761\u7684\u51fd\u6570\u3002\u6bd4\u5982 list.map(\u7eb8\u6761) \u7684\u610f\u601d\u662f&#034;\u5bf9\u5217\u8868\u91cc\u6bcf\u4e2a\u5143\u7d20&#xff0c;\u90fd\u7167\u8fd9\u5f20\u7eb8\u6761\u52a0\u5de5\u4e00\u4e0b&#xff0c;\u7ed9\u6211\u65b0\u5217\u8868&#034;\u3002<br \/>\n\u5bf9\u7167&#xff1a;list.map { it.name } \u91cc&#xff0c;{ it.name } \u5c31\u662f Lambda&#xff08;\u7eb8\u6761&#xff09;&#xff0c;it \u662f\u7eb8\u6761\u91cc&#034;\u5f53\u524d\u8fd9\u4e2a\u5143\u7d20&#034;\u7684\u4e34\u65f6\u540d\u5b57\u3002\u770b\u4e0d\u61c2\u6ca1\u5173\u7cfb\u2014\u2014\u4e0b\u9762 3.7.3 \u90a3\u5f20\u8868\u628a\u672c\u5de5\u7a0b\u7528\u5230\u7684\u5199\u6cd5\u90fd\u5217\u4e86&#xff0c;\u7167\u7740\u8ba4\u8138\u5373\u53ef\u3002<br \/>\n\u672c\u9879\u76ee\u89c4\u6a21\u4e0d\u5927&#xff0c;\u4f46\u4e0b\u9762\u8fd9\u4e9b\u90fd\u7528\u5230\u4e86\u3002<\/li>\n<\/ul>\n<h4>3.7.1 \u5148\u770b\u4e00\u4e2a\u771f\u5b9e\u7684\u5de5\u5177\u51fd\u6570<\/h4>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 model\/ModelInfo.kt:13-24<\/p>\n<p><span class=\"token comment\">\/** \u628a\u5b57\u8282\u6570\u683c\u5f0f\u5316\u4e3a\u4eba\u7c7b\u53ef\u8bfb\u7684\u4f53\u79ef&#xff08;\u5982 1.8 GB \/ 376 MB&#xff09; *\/<\/span><br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">formatFileSize<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token operator\">:<\/span> Long<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>bytes <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u672a\u77e5\u5927\u5c0f&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">val<\/span> units <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">arrayOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;B&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;KB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;MB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;GB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;TB&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> value <span class=\"token operator\">&#061;<\/span> bytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> unit <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>value <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">1024<\/span> <span class=\"token operator\">&amp;&amp;<\/span> unit <span class=\"token operator\">&lt;<\/span> units<span class=\"token punctuation\">.<\/span>lastIndex<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        value <span class=\"token operator\">\/&#061;<\/span> <span class=\"token number\">1024<\/span><br \/>\n        unit<span class=\"token operator\">&#043;&#043;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;%.1f %s&#034;<\/span><\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">,<\/span> units<span class=\"token punctuation\">[<\/span>unit<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9010\u884c\u62c6\u89e3&#xff1a;<\/p>\n<table>\n<tr>\u884c\u4ee3\u7801\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>13<\/td>\n<td>\/** &#8230; *\/<\/td>\n<td>KDoc \u6ce8\u91ca&#xff0c;\u8bf4\u660e\u8fd9\u4e2a\u51fd\u6570\u5e72\u561b<\/td>\n<\/tr>\n<tr>\n<td>14<\/td>\n<td>fun formatFileSize(bytes: Long): String {<\/td>\n<td>\u51fd\u6570\u58f0\u660e&#xff1a;\u5165\u53c2 Long&#xff0c;\u8fd4\u56de String<\/td>\n<\/tr>\n<tr>\n<td>15<\/td>\n<td>if (bytes &lt;&#061; 0) return &#034;\u672a\u77e5\u5927\u5c0f&#034;<\/td>\n<td>\u9632\u5fa1&#xff1a;\u975e\u6b63\u6570\u76f4\u63a5\u8fd4\u56de<\/td>\n<\/tr>\n<tr>\n<td>16<\/td>\n<td>val units &#061; arrayOf(&#8230;)<\/td>\n<td>\u5355\u4f4d\u8868<\/td>\n<\/tr>\n<tr>\n<td>17-18<\/td>\n<td>var value &#061; &#8230; \/ var unit &#061; 0<\/td>\n<td>\u6ce8\u610f\u8fd9\u91cc\u662f var\u2014\u2014\u5faa\u73af\u91cc\u8981\u6539<\/td>\n<\/tr>\n<tr>\n<td>19<\/td>\n<td>while (value &gt;&#061; 1024 &amp;&amp; unit &lt; units.lastIndex)<\/td>\n<td>\u8fd8\u6709\u5f97\u9664\u3001\u4e14\u6ca1\u5230\u6700\u5927\u5355\u4f4d<\/td>\n<\/tr>\n<tr>\n<td>20-21<\/td>\n<td>value \/&#061; 1024 \/ unit&#043;&#043;<\/td>\n<td>\u9664\u4e00\u6b21 1024&#xff0c;\u5355\u4f4d\u5347\u4e00\u7ea7<\/td>\n<\/tr>\n<tr>\n<td>23<\/td>\n<td>return &#034;%.1f %s&#034;.format(value, units[unit])<\/td>\n<td>\u683c\u5f0f\u5316\u6210 \u201c1.8 GB\u201d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u51e0\u4e2a\u8bed\u6cd5\u70b9&#xff1a;<\/p>\n<ul>\n<li>fun \u540d\u5b57(\u53c2\u6570: \u7c7b\u578b): \u8fd4\u56de\u7c7b\u578b \u2014\u2014 Kotlin \u51fd\u6570\u58f0\u660e\u7684\u56fa\u5b9a\u683c\u5f0f\u3002<\/li>\n<li>units.lastIndex \u2014\u2014 Array \u81ea\u5e26\u7684\u5c5e\u6027&#xff0c;\u7b49\u4e8e&#034;\u6700\u540e\u4e00\u4e2a\u4e0b\u6807&#034;&#xff08;\u8fd9\u91cc\u662f 4&#xff09;\u3002<br \/>\n\u7b49\u4ef7\u4e8e units.size &#8211; 1&#xff0c;\u4f46\u66f4\u4e0d\u5bb9\u6613\u5199\u9519\u3002<\/li>\n<li>&#034;%.1f %s&#034;.format(&#8230;) \u2014\u2014 \u548c Java \u7684 String.format \u4e00\u6837&#xff1a;%.1f \u662f\u4fdd\u7559 1 \u4f4d\u5c0f\u6570&#xff0c;%s \u662f\u5b57\u7b26\u4e32\u3002<\/li>\n<li>arrayOf(&#8230;) \u2014\u2014 \u9020\u6570\u7ec4&#xff1b;\u8981\u5217\u8868\u7528 listOf(&#8230;)\u3002<\/li>\n<\/ul>\n<p>&#x1f4cc; \u4e3a\u4ec0\u4e48 17-18 \u884c\u7528 var \u800c\u4e0d\u662f val&#xff1f;<br \/>\n\u56e0\u4e3a\u5b83\u4eec\u5728 while \u5faa\u73af\u91cc\u88ab\u91cd\u65b0\u8d4b\u503c&#xff08;value \/&#061; 1024 \u5c31\u662f value &#061; value \/ 1024&#xff09;\u3002<br \/>\n\u8fd9\u6b63\u597d\u8bf4\u660e 3.3 \u8bb2\u7684&#034;\u80fd\u7528 val \u5c31\u7528 val&#034;\u4e0d\u662f\u6559\u6761\u2014\u2014\u771f\u8981\u53d8\u7684\u65f6\u5019\u5c31\u7528 var\u3002<\/p>\n<p>\u7528\u5177\u4f53\u8f93\u5165\u628a\u8fd9\u6bb5\u4ee3\u7801&#034;\u8dd1\u4e00\u904d&#034;&#xff08;\u5f3a\u70c8\u5efa\u8bae\u8ddf\u7740\u8d70\u4e00\u904d&#xff09;<\/p>\n<p>\u5149\u770b\u8868\u5bb9\u6613\u89c9\u5f97&#034;\u61c2\u4e86&#034;&#xff0c;\u5176\u5b9e\u6ca1\u771f\u6b63\u8dd1\u8fc7\u3002\u6211\u4eec\u62ff\u4e00\u4e2a\u771f\u5b9e\u8f93\u5165 1536000&#xff08;\u5b57\u8282&#xff0c;\u7ea6 1.5 MB&#xff09;&#xff0c;<br \/>\n\u4e00\u6b65\u6b65\u770b\u8ba1\u7b97\u673a\u6267\u884c\u65f6\u53d1\u751f\u4e86\u4ec0\u4e48&#xff08;\u6ce8\u610f&#xff1a;\u4ee3\u7801\u91cc\u5faa\u73af\u53d8\u91cf\u53eb value&#xff0c;\u4e0d\u53eb size&#xff09;&#xff1a;<\/p>\n<table>\n<tr>\u6b65\u9aa4\u6267\u884c\u5230\u54ea\u6b64\u65f6 value\u6b64\u65f6 unit<\/tr>\n<tbody>\n<tr>\n<td>\u2460<\/td>\n<td>\u51fd\u6570\u5f00\u59cb&#xff1a;units &#061; [&#034;B&#034;,&#034;KB&#034;,&#034;MB&#034;,&#034;GB&#034;,&#034;TB&#034;]&#xff0c;value &#061; 1536000.0&#xff0c;unit &#061; 0<\/td>\n<td>1536000.0<\/td>\n<td>0&#xff08;B&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u2461<\/td>\n<td>while \u5224\u65ad&#xff1a;1536000 &gt;&#061; 1024 \u6210\u7acb&#xff0c;\u4e14 unit(0) &lt; 4 \u2192 \u8fdb\u5faa\u73af<\/td>\n<td>1536000.0<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td>\u2462<\/td>\n<td>value \/&#061; 1024 \u2192 1500.0&#xff1b;unit&#043;&#043; \u2192 1<\/td>\n<td>1500.0<\/td>\n<td>1&#xff08;KB&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u2463<\/td>\n<td>\u518d\u5224\u65ad&#xff1a;1500 &gt;&#061; 1024 \u6210\u7acb \u2192 \u518d\u5faa\u73af\u3002value \/&#061; 1024 \u2192 \u7ea6 1.4648&#xff1b;unit&#043;&#043; \u2192 2<\/td>\n<td>\u22481.4648<\/td>\n<td>2&#xff08;MB&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u2464<\/td>\n<td>\u518d\u5224\u65ad&#xff1a;1.4648 &gt;&#061; 1024 \u4e0d\u6210\u7acb \u2192 \u9000\u51fa\u5faa\u73af<\/td>\n<td>\u22481.4648<\/td>\n<td>2&#xff08;MB&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u2465<\/td>\n<td>return &#034;%.1f %s&#034;.format(value, units[2])<\/td>\n<td>\u2014<\/td>\n<td>\u8f93\u51fa &#034;1.5 MB&#034;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6ce8\u610f\u6700\u540e\u8f93\u51fa\u662f &#034;1.5 MB&#034; \u800c\u4e0d\u662f 1.46\u2014\u2014\u683c\u5f0f\u5316\u4e32\u505a\u4e86\u56db\u820d\u4e94\u5165&#xff0c;\u53ea\u7559\u4e00\u4f4d\u5c0f\u6570\u3002<\/p>\n<p>\u987a\u624b\u89e3\u91ca &#034;%.1f %s&#034;.format(&#8230;) \u8fd9\u4e2a\u683c\u5f0f\u5316\u4e32&#xff1a;<\/p>\n<ul>\n<li>%.1f &#061; \u201c\u4e00\u4e2a\u6570\u5b57&#xff0c;\u4fdd\u7559 1 \u4f4d\u5c0f\u6570\u201d&#xff08;f \u6765\u81ea float&#xff09;&#xff1b;<\/li>\n<li>%s &#061; \u201c\u4e00\u6bb5\u6587\u5b57\u201d&#xff08;s \u6765\u81ea string&#xff09;&#xff1b;<\/li>\n<li>\u4e24\u4e2a\u5360\u4f4d\u7b26\u4e2d\u95f4\u7684\u7a7a\u683c\u5c31\u662f\u666e\u901a\u7a7a\u683c&#xff1b;<\/li>\n<li>.format(value, units[2]) \u6309\u4ece\u5de6\u5230\u53f3\u7684\u987a\u5e8f\u628a\u62ec\u53f7\u91cc\u7684\u4e24\u4e2a\u53c2\u6570\u586b\u8fdb % \u5360\u4f4d\u7b26&#xff1a;<br \/>\n\u5148\u586b 1.4648&#xff08;\u2192 \u201c1.5\u201d&#xff09;&#xff0c;\u518d\u586b \u201cMB\u201d&#xff0c;\u62fc\u51fa &#034;1.5 MB&#034;\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u540e\u770b\u5230 &#034;%.2f&#034;\u3001&#034;%d&#034; \u8fd9\u7c7b\u5199\u6cd5\u5c31\u77e5\u9053&#xff1a;\u767e\u5206\u53f7\u5f00\u5934\u7684\u662f\u5360\u4f4d\u7b26&#xff0c;format \u8d1f\u8d23\u6309\u987a\u5e8f\u586b\u7a7a\u3002<\/p>\n<h4>3.7.2 \u518d\u770b\u4e00\u4e2a\u5e26\u96c6\u5408\u904d\u5386\u7684<\/h4>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 util\/ThinkStripper.kt:48-58<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">fun<\/span> <span class=\"token function\">trailingPartialTagLength<\/span><span class=\"token punctuation\">(<\/span>text<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> Int <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>text<span class=\"token punctuation\">.<\/span><span class=\"token function\">isEmpty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><br \/>\n    <span class=\"token keyword\">var<\/span> best <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>tag <span class=\"token keyword\">in<\/span> <span class=\"token function\">listOf<\/span><span class=\"token punctuation\">(<\/span>OPEN_TAG<span class=\"token punctuation\">,<\/span> CLOSE_TAG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">val<\/span> maxLen <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">minOf<\/span><span class=\"token punctuation\">(<\/span>tag<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> text<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>len <span class=\"token keyword\">in<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">..<\/span>maxLen<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>text<span class=\"token punctuation\">.<\/span><span class=\"token function\">endsWith<\/span><span class=\"token punctuation\">(<\/span>tag<span class=\"token punctuation\">.<\/span><span class=\"token function\">substring<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> best <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">maxOf<\/span><span class=\"token punctuation\">(<\/span>best<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> best<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8bed\u6cd5\u70b9&#xff1a;<\/p>\n<table>\n<tr>\u5199\u6cd5\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>for (tag in listOf(&#8230;))<\/td>\n<td>\u904d\u5386\u4e00\u4e2a\u53ea\u8bfb\u5217\u8868<\/td>\n<\/tr>\n<tr>\n<td>listOf(a, b)<\/td>\n<td>\u9020\u53ea\u8bfb List&#xff08;\u8981\u53ef\u53d8\u7684\u7528 mutableListOf&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>1..maxLen<\/td>\n<td>\u533a\u95f4&#xff0c;\u8868\u793a 1 \u5230 maxLen&#xff08;\u542b\u4e24\u7aef&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>minOf(a, b) \/ maxOf(a, b)<\/td>\n<td>\u53d6\u8f83\u5c0f \/ \u8f83\u5927\u503c<\/td>\n<\/tr>\n<tr>\n<td>text.endsWith(x)<\/td>\n<td>\u5b57\u7b26\u4e32\u662f\u5426\u4ee5 x \u7ed3\u5c3e<\/td>\n<\/tr>\n<tr>\n<td>tag.substring(0, len)<\/td>\n<td>\u53d6\u524d len \u4e2a\u5b57\u7b26<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u6bb5\u5728\u5e72\u4ec0\u4e48&#xff1f;&#xff08;\u8fd9\u662f\u7406\u89e3\u6d41\u5f0f\u8f93\u51fa\u7684\u5173\u952e\u7ec6\u8282&#xff09;<br \/>\n\u5b83\u5728\u68c0\u67e5\u6587\u672c\u672b\u5c3e\u662f\u4e0d\u662f &lt;think&gt; \u6216 &lt;\/think&gt; \u7684\u4e0d\u5b8c\u6574\u524d\u7f00\u3002<br \/>\n\u6bd4\u5982\u6d41\u5f0f\u8f93\u51fa\u6b63\u597d\u65ad\u5728 &#034;&lt;th&#034; \u8fd9\u91cc&#xff0c;\u51fd\u6570\u8fd4\u56de 2&#xff0c;\u8c03\u7528\u65b9\u5c31\u628a\u8fd9\u4e24\u4e2a\u5b57\u7b26\u6263\u7559&#xff0c;<br \/>\n\u7b49\u4e0b\u4e00\u6bb5\u6570\u636e\u6765\u4e86\u518d\u5224\u65ad\u2014\u2014\u907f\u514d\u628a &lt;th \u5f53\u6210\u6b63\u6587\u663e\u793a\u7ed9\u7528\u6237\u3002<\/p>\n<h4>3.7.3 \u5e38\u89c1\u7684\u96c6\u5408\/\u5b57\u7b26\u4e32\u64cd\u4f5c\u901f\u67e5<\/h4>\n<table>\n<tr>\u64cd\u4f5c\u5199\u6cd5\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u53d8\u6362<\/td>\n<td>list.map { it.name }<\/td>\n<td>\u6bcf\u4e2a\u5143\u7d20\u8f6c\u4e00\u6b21&#xff0c;\u8fd4\u56de\u65b0\u5217\u8868<\/td>\n<\/tr>\n<tr>\n<td>\u8fc7\u6ee4<\/td>\n<td>list.filter { it.size &gt; 0 }<\/td>\n<td>\u7559\u4e0b\u6ee1\u8db3\u6761\u4ef6\u7684<\/td>\n<\/tr>\n<tr>\n<td>\u904d\u5386<\/td>\n<td>list.forEach { println(it) }<\/td>\n<td>\u5bf9\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u64cd\u4f5c&#xff08;\u65e0\u8fd4\u56de\u503c&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u67e5\u627e<\/td>\n<td>list.firstOrNull { it.id &#061;&#061; id }<\/td>\n<td>\u627e\u7b2c\u4e00\u4e2a\u6ee1\u8db3\u7684&#xff0c;\u627e\u4e0d\u5230\u8fd4\u56de null<\/td>\n<\/tr>\n<tr>\n<td>\u6392\u5e8f<\/td>\n<td>list.sortedByDescending { it.updatedAt }<\/td>\n<td>\u6309\u67d0\u5b57\u6bb5\u5012\u5e8f<\/td>\n<\/tr>\n<tr>\n<td>\u6c42\u548c<\/td>\n<td>list.sumOf { it.size }<\/td>\n<td>\u6c42\u548c<\/td>\n<\/tr>\n<tr>\n<td>\u62fc\u63a5<\/td>\n<td>&#034;a&#034; &#043; &#034;b&#034;\u3001list.joinToString(&#034;, &#034;)<\/td>\n<td>\u62fc\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4dd; it \u662f\u5355\u53c2\u6570 Lambda \u7684\u9690\u5f0f\u540d\u5b57\u3002\u5199 { it.name } \u7b49\u4ef7\u4e8e { x -&gt; x.name }\u3002<br \/>\n\u5f53 Lambda \u53ea\u6709\u4e00\u4e2a\u53c2\u6570\u65f6\u53ef\u4ee5\u7528 it&#xff0c;\u591a\u4e2a\u53c2\u6570\u5c31\u5fc5\u987b\u663e\u5f0f\u547d\u540d&#xff1a;{ a, b -&gt; a &#043; b }\u3002<\/p>\n<hr \/>\n<h3>3.8 object&#xff1a;\u5355\u4f8b\u5c31\u8fd9\u4e48\u5199<\/h3>\n<h4>3.8.1 \u8fd9\u662f\u4ec0\u4e48\u3001\u4e3a\u4ec0\u4e48\u9700\u8981<\/h4>\n<p>\u8fd9\u662f\u4ec0\u4e48&#xff08;\u5927\u767d\u8bdd&#xff09;&#xff1a;**\u5355\u4f8b&#xff08;singleton&#xff09;**\u5c31\u662f&#034;\u6574\u4e2a App \u91cc\u53ea\u9020\u4e00\u4e2a\u3001\u5927\u5bb6\u5171\u7528\u540c\u4e00\u4e2a&#034;\u7684\u5bf9\u8c61\u3002<br \/>\nKotlin \u7528\u4e00\u4e2a\u5173\u952e\u5b57 object \u5c31\u80fd\u58f0\u660e\u5b83\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u9700\u8981\u5355\u4f8b&#xff1f; \u62ff\u672c\u5de5\u7a0b\u7684 ThinkStripper&#xff08;\u8d1f\u8d23\u5265\u6389\u6a21\u578b\u8f93\u51fa\u7684 &lt;think&gt;&#8230;&lt;\/think&gt; \u601d\u8003\u5757&#xff09;\u4e3e\u4f8b&#xff1a;<br \/>\n\u201c\u524a\u76ae&#034;\u8fd9\u4ef6\u4e8b\u4e0d\u9700\u8981\u6bcf\u804a\u4e00\u53e5\u5c31\u4e70\u4e00\u4e2a\u524a\u76ae\u5668\u2014\u2014\u6574\u4e2a App \u5171\u7528\u4e00\u4e2a\u5c31\u591f\u4e86\u3002<br \/>\n\u5982\u679c\u6bcf\u6b21\u5265\u4e00\u6bb5\u6587\u5b57\u90fd&#034;\u65b0\u9020\u4e00\u4e2a\u524a\u76ae\u5668\u201d&#xff0c;\u4f1a\u767d\u767d\u6d6a\u8d39\u5185\u5b58&#xff1b;<br \/>\n\u66f4\u7cdf\u7684\u662f&#xff0c;\u591a\u4e2a\u524a\u76ae\u5668\u5404\u81ea\u8bb0\u7740\u81ea\u5df1\u7684\u4e2d\u95f4\u72b6\u6001&#xff0c;\u53ef\u80fd\u5265\u5f97\u524d\u540e\u4e0d\u4e00\u81f4\u3002<br \/>\n&#034;\u53ea\u9020\u4e00\u4e2a\u3001\u5168\u5c40\u5171\u7528&#034;\u5c31\u540c\u65f6\u89e3\u51b3\u4e86\u8fd9\u4e24\u4e2a\u95ee\u9898\u3002<\/p>\n<p>\u6700\u5c0f\u793a\u4f8b&#xff1a;<\/p>\n<p>&#x1f4dd; <span class=\"token keyword\">object<\/span> ThinkStripper <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">strip<\/span><span class=\"token punctuation\">(<\/span>text<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token punctuation\">{<\/span> <span class=\"token operator\">..<\/span><span class=\"token punctuation\">.<\/span> <span class=\"token punctuation\">}<\/span>   <span class=\"token comment\">\/\/ \u91cc\u9762\u5199\u4e00\u4e32\u64cd\u4f5c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528&#xff1a;\u76f4\u63a5\u7528\u540d\u5b57\u8c03\u7528&#xff0c;\u4e0d\u9700\u8981&#034;new \u4e00\u4e2a\u65b0\u7684&#034;<\/span><br \/>\nThinkStripper<span class=\"token punctuation\">.<\/span><span class=\"token function\">strip<\/span><span class=\"token punctuation\">(<\/span>rawText<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5de5\u7a0b\u771f\u8eab&#xff1a;3.8.2 \u662f\u5de5\u7a0b\u91cc\u771f\u5b9e\u7684 ThinkStripper&#xff08;59 \u884c&#xff0c;\u672c\u9879\u76ee\u552f\u4e00\u4e00\u4e2a object&#xff09;\u3002<\/p>\n<p>object \u58f0\u660e\u7684\u7c7b\u5728\u6574\u4e2a\u8fdb\u7a0b\u91cc\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b&#xff0c;\u7531 Kotlin \u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u5730\u521b\u5efa\u3002<\/p>\n<h4>3.8.2 \u5de5\u7a0b\u91cc\u7684\u771f\u8eab<\/h4>\n<p>\u5728\u770b\u5de5\u7a0b\u4ee3\u7801\u4e4b\u524d&#xff0c;\u5148\u7528\u4e09\u53e5\u8bdd\u8ba4\u8bc6\u4e00\u4e0b \u6b63\u5219\u8868\u8fbe\u5f0f&#xff08;regex&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u5b83\u662f\u4ec0\u4e48&#xff1a;\u4e00\u79cd&#034;\u6309\u89c4\u5219\u6279\u91cf\u627e\u6587\u5b57&#034;\u7684\u8ff7\u4f60\u8bed\u8a00\u3002\u624b\u52a8\u5224\u65ad&#034;\u7b2c\u51e0\u4e2a\u5b57\u7b26\u662f\u4e0d\u662f &lt;\u201c&#xff0c;\u5f97\u4e00\u4e2a\u5b57\u7b26\u4e00\u4e2a\u5b57\u7b26\u5730\u770b&#xff1b;\u6b63\u5219\u7528\u4e00\u884c\u7b26\u53f7\u5c31\u80fd\u63cf\u8ff0&#034;\u627e\u4e00\u6bb5\u4ee5 &lt;think&gt; \u5f00\u5934\u3001&lt;\/think&gt; \u7ed3\u5c3e\u7684\u6587\u5b57\u201d\u3002<\/li>\n<li>\u4e3a\u4ec0\u4e48\u9700\u8981&#xff1a;\u9010\u5b57\u7b26\u624b\u5199\u5224\u65ad\u592a\u5570\u55e6&#xff0c;\u8fd8\u5bb9\u6613\u6f0f\u6389\u8fb9\u89d2&#xff08;\u6bd4\u5982\u6807\u7b7e\u4e2d\u95f4\u6362\u4e86\u4e00\u884c\u600e\u4e48\u529e&#xff09;\u3002\u6b63\u5219\u628a&#034;\u6309\u6a21\u5f0f\u627e\u6587\u5b57&#034;\u8fd9\u4ef6\u4e8b\u4ea4\u7ed9\u4e13\u95e8\u7684\u5f15\u64ce\u505a\u3002<\/li>\n<li>\u672c\u5de5\u7a0b\u7528\u5b83\u505a\u4ec0\u4e48&#xff1a;\u5265\u6389\u6a21\u578b\u8f93\u51fa\u91cc\u7684 &lt;think&gt;&#8230;&lt;\/think&gt; \u601d\u8003\u5757&#xff0c;\u53ea\u7559\u6b63\u6587\u3002\u4e0b\u9762\u4ee3\u7801\u91cc\u4e09\u4e2a Regex(&#8230;) \u5206\u522b\u8d1f\u8d23&#xff1a;\u5df2\u95ed\u5408\u7684\u601d\u8003\u5757\u3001\u8fd8\u6ca1\u95ed\u5408\u7684\u601d\u8003\u5757\u3001\u6f0f\u6389\u7684\u5b64\u7acb\u95ed\u5408\u6807\u7b7e\u3002<\/li>\n<\/ul>\n<p>\u6b63\u5219\u8bed\u6cd5\u7ec6\u8282\u672c\u7ae0\u4e0d\u5c55\u5f00&#xff08;\u4f60\u73b0\u5728\u4e5f\u4e0d\u9700\u8981\u4f1a\u5199&#xff09;&#xff0c;\u5148\u8ba4\u8138\u5373\u53ef\u3002<\/p>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 util\/ThinkStripper.kt:20-42<\/p>\n<p><span class=\"token keyword\">object<\/span> ThinkStripper <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> OPEN_TAG <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&lt;think&gt;&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> CLOSE_TAG <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&lt;\/think&gt;&#034;<\/span><\/span><\/p>\n<p>    <span class=\"token comment\">\/** \u5df2\u95ed\u5408\u7684\u601d\u8003\u5757&#xff1b;(?s) \u8ba9 . \u5339\u914d\u6362\u884c&#xff0c;\u975e\u8d2a\u5a6a\u907f\u514d\u541e\u6389\u540e\u7eed\u6b63\u6587 *\/<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> COMPLETE_THINK <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">Regex<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal multiline\"><span class=\"token string\">&#034;&#034;&#034;(?s)\\\\s*&lt;think&gt;.*?&lt;\/think&gt;\\\\s*&#034;&#034;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/** \u672a\u95ed\u5408\u7684\u601d\u8003\u5757&#xff1a;\u6b63\u5728\u601d\u8003\u4e2d&#xff0c;\u5176\u540e\u6240\u6709\u5185\u5bb9\u90fd\u8fd8\u4e0d\u662f\u6b63\u6587 *\/<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> OPEN_THINK <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">Regex<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal multiline\"><span class=\"token string\">&#034;&#034;&#034;(?s)\\\\s*&lt;think&gt;.*&#034;&#034;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/** \u9632\u5fa1&#xff1a;\u6a21\u677f\u6ce8\u5165\u5f00\u5934\u6807\u7b7e\u65f6\u6d41\u91cc\u53ef\u80fd\u53ea\u6709\u5b64\u7acb\u7684\u95ed\u5408\u6807\u7b7e *\/<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">val<\/span> STRAY_CLOSE <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">Regex<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal multiline\"><span class=\"token string\">&#034;&#034;&#034;\\\\s*&lt;\/think&gt;\\\\s*&#034;&#034;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/** \u5265\u79bb\u601d\u8003\u5757&#xff1b;\u7ed3\u679c\u53ea\u505a\u9996\u5c3e\u53bb\u7a7a\u767d&#xff0c;\u5c3e\u90e8\u53ef\u80fd\u6263\u7559\u4e0d\u5b8c\u6574\u7684\u6807\u7b7e\u7247\u6bb5 *\/<\/span><br \/>\n    <span class=\"token keyword\">fun<\/span> <span class=\"token function\">strip<\/span><span class=\"token punctuation\">(<\/span>text<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">val<\/span> cleaned <span class=\"token operator\">&#061;<\/span> text<span class=\"token punctuation\">.<\/span><span class=\"token function\">replace<\/span><span class=\"token punctuation\">(<\/span>COMPLETE_THINK<span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">replace<\/span><span class=\"token punctuation\">(<\/span>OPEN_THINK<span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">replace<\/span><span class=\"token punctuation\">(<\/span>STRAY_CLOSE<span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">trim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">val<\/span> partial <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">trailingPartialTagLength<\/span><span class=\"token punctuation\">(<\/span>cleaned<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>partial <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> cleaned<span class=\"token punctuation\">.<\/span><span class=\"token function\">dropLast<\/span><span class=\"token punctuation\">(<\/span>partial<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">else<\/span> cleaned<br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u65b0\u8bed\u6cd5\u70b9&#xff1a;<\/p>\n<table>\n<tr>\u5199\u6cd5\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>object \u540d\u5b57 { }<\/td>\n<td>\u5355\u4f8b\u5bf9\u8c61\u58f0\u660e<\/td>\n<\/tr>\n<tr>\n<td>private const val<\/td>\n<td>\u7f16\u8bd1\u671f\u5e38\u91cf&#xff08;\u53ea\u80fd\u4fee\u9970\u57fa\u672c\u7c7b\u578b\/String&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>private val X &#061; Regex(&#8230;)<\/td>\n<td>\u6b63\u5219\u5bf9\u8c61&#xff0c;\u9884\u5148\u7f16\u8bd1\u597d\u590d\u7528&#xff08;\u4e0d\u8981\u6bcf\u6b21\u8c03\u7528\u90fd\u91cd\u5efa&#xff0c;\u5f88\u6162&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>&#034;&#034;&#034;&#8230;&#034;&#034;&#034;<\/td>\n<td>\u539f\u59cb\u5b57\u7b26\u4e32&#xff0c;\u91cc\u9762 \\\\ \u4e0d\u7528\u8f6c\u4e49&#xff0c;\u53ef\u76f4\u63a5\u5199 \\\\s<\/td>\n<\/tr>\n<tr>\n<td>Regex(&#034;&#8230;&#034;)<\/td>\n<td>\u6784\u9020\u6b63\u5219<\/td>\n<\/tr>\n<tr>\n<td>\u94fe\u5f0f .replace().replace().trim()<\/td>\n<td>\u6bcf\u4e2a\u90fd\u8fd4\u56de\u65b0\u5b57\u7b26\u4e32&#xff0c;\u53ef\u94fe\u5f0f\u8c03\u7528<\/td>\n<\/tr>\n<tr>\n<td>if (cond) a else b<\/td>\n<td>Kotlin \u7684 if \u662f\u8868\u8fbe\u5f0f&#xff0c;\u53ef\u4ee5\u76f4\u63a5 return if&#8230;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4cc; const val vs val \u7684\u533a\u522b\u2014\u2014&#034;\u7f16\u8bd1\u671f&#034;\u548c&#034;\u8fd0\u884c\u65f6&#034;\u5230\u5e95\u5dee\u5728\u54ea&#xff1a;<\/p>\n<ul>\n<li>\u7f16\u8bd1\u671f\u5e38\u91cf&#xff08;const val&#xff09;&#xff1a;\u6253\u5305 App \u7684\u90a3\u4e00\u523b&#xff0c;\u503c\u5c31\u6b7b\u6b7b\u5b9a\u4e0b\u6765\u4e86&#xff0c;<br \/>\n\u4f1a\u88ab\u76f4\u63a5\u5199\u8fdb\u5b89\u88c5\u5305\u3002\u7c7b\u6bd4&#xff1a;\u83dc\u8c31\u4e0a\u5370\u6b7b\u7684&#034;\u76d0 3 \u514b&#034;\u2014\u2014\u5370\u51fa\u6765\u4ee5\u540e\u8c01\u4e5f\u6539\u4e0d\u4e86\u3002<br \/>\n\u53ea\u80fd\u662f\u6570\u5b57\u3001\u5e03\u5c14\u3001\u5b57\u7b26\u4e32\u8fd9\u79cd\u7b80\u5355\u7c7b\u578b\u3002<\/li>\n<li>\u8fd0\u884c\u65f6\u53ea\u8bfb&#xff08;val&#xff09;&#xff1a;App \u8dd1\u8d77\u6765\u4e4b\u540e\u624d\u7b97\u51fa\u6765\u7684\u503c\u3002\u7c7b\u6bd4&#xff1a;\u505a\u83dc\u65f6\u5c1d\u4e86\u4e00\u53e3&#xff0c;<br \/>\n\u6839\u636e\u54b8\u6de1\u4e34\u573a\u52a0\u7684\u90a3\u52fa\u76d0\u2014\u2014\u83dc\u8c31\u4e0a\u6ca1\u6cd5\u9884\u5148\u5199\u6b7b\u3002\u4e0a\u9762\u7684 Regex(&#8230;) \u5c31\u8981\u5728\u8fd0\u884c\u65f6\u624d\u6784\u9020\u597d&#xff0c;<br \/>\n\u6240\u4ee5\u53ea\u80fd\u662f val&#xff0c;\u4e0d\u80fd const val\u3002<\/li>\n<\/ul>\n<p>\u672c\u5de5\u7a0b\u91cc AppSettings \u7684\u90a3\u4e9b\u9ed8\u8ba4\u503c\u7528\u7684\u5c31\u662f const val&#xff08;\u89c1 3.9&#xff09;\u3002<\/p>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u7684\u4e1a\u52a1\u542b\u4e49\u4e5f\u503c\u5f97\u8bb0\u4e00\u4e0b&#xff1a;Qwen3 \u8fd9\u7c7b\u63a8\u7406\u6a21\u578b\u4f1a\u5148\u8f93\u51fa &lt;think&gt;\u601d\u8003\u8fc7\u7a0b&lt;\/think&gt;<br \/>\n\u518d\u7ed9\u6b63\u6587\u3002\u672c\u51fd\u6570\u5728\u5e94\u7528\u5c42\u628a\u601d\u8003\u5757\u5265\u6389&#xff0c;\u8ba9 UI \u53ea\u663e\u793a\u6b63\u6587\u3001TTS \u53ea\u6717\u8bfb\u6b63\u6587\u3002<br \/>\n\u6ce8\u610f\u5b83\u662f&#034;\u6d41\u5f0f\u5b89\u5168&#034;\u7684\u2014\u2014\u9010 token \u5230\u8fbe\u65f6\u4e5f\u4e0d\u4f1a\u628a\u6807\u7b7e\u788e\u7247\u6f0f\u51fa\u6765\u3002<\/p>\n<hr \/>\n<h3>3.9 when&#xff1a;\u6bd4 switch \u5f3a\u5f97\u591a\u7684\u5206\u652f<\/h3>\n<h4>3.9.1 \u57fa\u672c\u7528\u6cd5<\/h4>\n<p>when \u662f Kotlin \u7684&#034;\u589e\u5f3a\u7248 switch&#034;&#xff0c;\u5b83\u53ef\u4ee5\u4f5c\u4e3a\u8868\u8fbe\u5f0f\u76f4\u63a5\u8fd4\u56de\u503c\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u9700\u8981\u5b83&#xff1f; \u4e00\u4e2a\u53d8\u91cf&#034;\u7b49\u4e8e\u4e0d\u540c\u503c\u5c31\u8d70\u4e0d\u540c\u5206\u652f&#034;\u7684\u60c5\u51b5&#xff0c;\u5982\u679c\u7528 if&#8230;else if&#8230;else<br \/>\n\u4e00\u5c42\u5c42\u5199\u4e0b\u53bb&#xff0c;\u53c8\u957f\u53c8\u5bb9\u6613\u6f0f\u5206\u652f&#xff1b;when \u628a&#034;\u4e00\u4e2a\u503c\u7684\u51e0\u79cd\u60c5\u51b5&#034;\u6574\u9f50\u5217\u6210\u4e00\u5f20\u6e05\u5355&#xff0c;<br \/>\n\u8fd8\u80fd\u76f4\u63a5\u5f53\u503c\u8d4b\u7ed9\u53d8\u91cf\u3002<\/p>\n<p><span class=\"token keyword\">val<\/span> label <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">when<\/span> <span class=\"token punctuation\">(<\/span>themeMode<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token number\">0<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u8ddf\u968f\u7cfb\u7edf&#034;<\/span><\/span><br \/>\n    <span class=\"token number\">1<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u6d45\u8272&#034;<\/span><\/span><br \/>\n    <span class=\"token number\">2<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u6df1\u8272&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u672a\u77e5&#034;<\/span><\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5206\u652f\u7528 -&gt;&#xff0c;\u4e0d\u7528 :&#xff1b;\u800c\u4e14\u6574\u4e2a when \u662f\u4e00\u4e2a\u6709\u503c\u7684\u8868\u8fbe\u5f0f&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u8d4b\u7ed9 label\u3002<\/p>\n<h4>3.9.2 \u5de5\u7a0b\u91cc\u7684\u5bf9\u5e94\u5e38\u91cf<\/h4>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b\u3001\u5df2\u7f16\u8bd1\u9a8c\u8bc1 \u2014\u2014 util\/AppSettings.kt:56-58<\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> THEME_SYSTEM <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> THEME_LIGHT <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">val<\/span> THEME_DARK <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><\/p>\n<p>\u6709\u4e86\u5e38\u91cf&#xff0c;\u4e0a\u9762\u7684 when \u5c31\u80fd\u5199\u5f97\u66f4\u6e05\u695a&#xff1a;<\/p>\n<p><span class=\"token keyword\">val<\/span> label <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">when<\/span> <span class=\"token punctuation\">(<\/span>themeMode<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    AppSettings<span class=\"token punctuation\">.<\/span>THEME_SYSTEM <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u8ddf\u968f\u7cfb\u7edf&#034;<\/span><\/span><br \/>\n    AppSettings<span class=\"token punctuation\">.<\/span>THEME_LIGHT  <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u6d45\u8272&#034;<\/span><\/span><br \/>\n    AppSettings<span class=\"token punctuation\">.<\/span>THEME_DARK   <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u6df1\u8272&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u672a\u77e5&#034;<\/span><\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f4cc; \u4e3a\u4ec0\u4e48\u8981\u7528\u5e38\u91cf\u800c\u4e0d\u662f\u76f4\u63a5\u5199 0\/1\/2&#xff1f;<br \/>\n\u56e0\u4e3a when(mode) \u91cc\u5199 0 \u662f&#034;\u9b54\u6cd5\u6570\u5b57&#034;&#xff0c;\u534a\u5e74\u540e\u4f60\u6839\u672c\u60f3\u4e0d\u8d77 0 \u662f\u4ec0\u4e48\u610f\u601d\u3002<br \/>\n\u7528 THEME_SYSTEM \u5219\u671b\u6587\u751f\u4e49\u3002\u8fd9\u662f\u672c\u9879\u76ee\u7684\u4e00\u8d2f\u505a\u6cd5\u3002<\/p>\n<h4>3.9.3 when \u8fd8\u80fd\u600e\u4e48\u73a9<\/h4>\n<p><span class=\"token comment\">\/\/ \u2460 \u5339\u914d\u591a\u4e2a\u503c<\/span><br \/>\n<span class=\"token keyword\">when<\/span> <span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u5c0f&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u4e2d&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u5927&#034;<\/span><\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2461 \u5339\u914d\u8303\u56f4<\/span><br \/>\n<span class=\"token keyword\">when<\/span> <span class=\"token punctuation\">(<\/span>score<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">in<\/span> <span class=\"token number\">0<\/span><span class=\"token operator\">..<\/span><span class=\"token number\">59<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u4e0d\u53ca\u683c&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">in<\/span> <span class=\"token number\">60<\/span><span class=\"token operator\">..<\/span><span class=\"token number\">100<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u53ca\u683c&#034;<\/span><\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u65e0\u6548&#034;<\/span><\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2462 \u4e0d\u5e26\u53c2\u6570\u7684 when&#xff08;\u5f53 if-else \u94fe\u7528&#xff09;<\/span><br \/>\n<span class=\"token keyword\">when<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    text<span class=\"token punctuation\">.<\/span><span class=\"token function\">isEmpty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u7a7a&#034;<\/span><\/span><br \/>\n    text<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u592a\u957f&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">else<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u6b63\u5e38&#034;<\/span><\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2463 \u5339\u914d\u7c7b\u578b&#xff08;\u914d\u5408\u5bc6\u5c01\u7c7b&#xff0c;\u5f3a\u5236\u5904\u7406\u6240\u6709\u60c5\u51b5&#xff09;<\/span><br \/>\n<span class=\"token keyword\">when<\/span> <span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">is<\/span> State<span class=\"token punctuation\">.<\/span>ModelReady <span class=\"token operator\">-&gt;<\/span> \u663e\u793a\u8f93\u5165\u6846<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">is<\/span> State<span class=\"token punctuation\">.<\/span>LoadingModel <span class=\"token operator\">-&gt;<\/span> \u663e\u793a\u8fdb\u5ea6\u6761<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">is<\/span> State<span class=\"token punctuation\">.<\/span>Error <span class=\"token operator\">-&gt;<\/span> \u663e\u793a\u9519\u8bef<span class=\"token punctuation\">(<\/span>state<span class=\"token punctuation\">.<\/span>exception<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#x1f4a1; \u7b2c \u2463 \u79cd\u662f\u672c\u9879\u76ee\u6700\u91cd\u8981\u7684\u7528\u6cd5&#xff0c;\u8bf7\u628a\u5b83\u8bfb\u61c2\u3002<\/p>\n<p>\u4ec0\u4e48\u662f\u5bc6\u5c01\u7c7b&#xff08;sealed class&#xff09;&#xff1f; \u5b83\u662f\u4e00\u79cd&#034;\u5bb6\u8c31\u88ab\u7f16\u8bd1\u5668\u770b\u5f97\u4e00\u6e05\u4e8c\u695a&#034;\u7684\u7c7b&#xff1a;<br \/>\n\u4f60\u58f0\u660e\u4e86\u5b83\u6709\u54ea\u51e0\u4e2a\u5b50\u7c7b&#xff0c;\u7f16\u8bd1\u5668\u5c31\u77e5\u9053&#034;\u5b83\u7684\u540e\u4ee3\u53ea\u6709\u8fd9\u51e0\u4e2a&#xff0c;\u4e0d\u4f1a\u518d\u5192\u51fa\u65b0\u7684&#034;\u3002<\/p>\n<p>\u8fd9\u4e3a\u4ec0\u4e48\u91cd\u8981&#xff1f; \u65e2\u7136\u7f16\u8bd1\u5668\u77e5\u9053\u72b6\u6001&#034;\u53ea\u53ef\u80fd\u6709\u8fd9\u51e0\u79cd\u957f\u76f8&#034;&#xff0c;<br \/>\n\u90a3\u4f60\u5199 when \u65f6\u5982\u679c\u6f0f\u5199\u4e86\u5176\u4e2d\u4e00\u79cd&#xff08;\u6bd4\u5982\u52a0\u4e86\u4e00\u79cd\u65b0\u72b6\u6001&#xff0c;\u5374\u5fd8\u4e86\u5728\u754c\u9762\u4e0a\u5904\u7406\u5b83&#xff09;&#xff0c;<br \/>\n\u7f16\u8bd1\u5668\u5c31\u76f4\u63a5\u62a5\u9519\u63d0\u9192\u4f60&#034;\u6f0f\u4e86\u8fd9\u79cd\u60c5\u51b5&#034;\u2014\u2014\u8fd9\u4e2a\u80fd\u529b\u53eb\u7a77\u5c3d\u6027\u68c0\u67e5&#xff08;exhaustive check&#xff09;\u3002<br \/>\n\u53cd\u8fc7\u6765&#xff0c;\u5982\u679c\u662f\u666e\u901a\u7c7b&#xff0c;\u7f16\u8bd1\u5668\u4e0d\u77e5\u9053\u4ee5\u540e\u8fd8\u4f1a\u5192\u51fa\u4ec0\u4e48\u5b50\u7c7b&#xff0c;<br \/>\n\u5c31\u53ea\u80fd\u8ba9\u4f60\u5199\u4e00\u4e2a else \u515c\u5e95&#xff1b;\u771f\u6f0f\u4e86\u5b83\u4e5f\u4e0d\u542d\u58f0\u3002<\/p>\n<p>\u4e00\u53e5\u8bdd&#xff1a;\u5bc6\u5c01\u7c7b &#043; \u628a\u6240\u6709 is \u5206\u652f\u5199\u5168 &#061; \u7f16\u8bd1\u5668\u66ff\u4f60\u76ef\u7740&#034;\u6bcf\u79cd\u60c5\u51b5\u90fd\u5904\u7406\u5230\u4e86&#034;\u3002<br \/>\n\u672c\u9879\u76ee\u5f15\u64ce\u7684\u72b6\u6001\u673a\u5c31\u662f\u8fd9\u4e48\u5199\u7684&#xff08;ch01 1.5.6 \u89c1\u8fc7&#xff09;&#xff0c;ch09 \u4f1a\u6df1\u5165\u3002<\/p>\n<hr \/>\n<h3>3.10 \u52a8\u624b\u9a8c\u8bc1&#xff1a;\u7ed9 ModelInfo \u52a0\u4e00\u4e2a\u5b57\u6bb5<\/h3>\n<p>\u5149\u770b\u4e0d\u591f&#xff0c;\u4eb2\u624b\u7f16\u8bd1\u4e00\u6b21\u624d\u53eb\u5b66\u4f1a\u3002\u6211\u4eec\u6765\u7ed9\u6a21\u578b\u4fe1\u606f\u52a0\u4e00\u4e2a description \u5b57\u6bb5\u3002<\/p>\n<h4>3.10.1 \u6b65\u9aa4<\/h4>\n<p>\u2460 \u6253\u5f00 app\/src\/main\/java\/com\/example\/llama\/model\/ModelInfo.kt<\/p>\n<p>\u2461 \u52a0\u4e00\u884c&#xff08;\u653e\u5728\u6700\u540e&#xff0c;\u5e26\u9ed8\u8ba4\u503c&#xff0c;\u4fdd\u8bc1\u5df2\u6709\u4ee3\u7801\u4ecd\u80fd\u7f16\u8bd1&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">ModelInfo<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> name<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> path<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> size<span class=\"token operator\">:<\/span> Long <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> isLoaded<span class=\"token operator\">:<\/span> Boolean <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> architecture<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> quantization<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> description<span class=\"token operator\">:<\/span> String <span class=\"token operator\">&#061;<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;&#034;<\/span><\/span>   <span class=\"token comment\">\/\/ \u2190 \u65b0\u589e<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u2462 \u5728 llama.android \u76ee\u5f55\u6267\u884c&#xff1a;<\/p>\n<p>gradlew :app:compileDebugKotlin<\/p>\n<h4>3.10.2 \u9884\u671f\u7ed3\u679c<\/h4>\n<p>\u2705 \u9884\u671f&#xff1a;BUILD SUCCESSFUL\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u52a0\u4e86\u5b57\u6bb5\u5374\u4e0d\u4f1a\u7834\u574f\u5df2\u6709\u4ee3\u7801&#xff1f;<br \/>\n\u56e0\u4e3a\u65b0\u5b57\u6bb5\u6709\u9ed8\u8ba4\u503c&#xff08;&#061; &#034;&#034;&#xff09;\u3002Kotlin \u4f1a\u5728\u6240\u6709\u6ca1\u4f20\u8fd9\u4e2a\u53c2\u6570\u7684\u5730\u65b9\u81ea\u52a8\u8865\u4e0a\u9ed8\u8ba4\u503c\u3002<br \/>\n\u8fd9\u6b63\u662f&#034;data class &#043; \u9ed8\u8ba4\u53c2\u6570&#034;\u7684\u5a01\u529b\u2014\u2014\u6269\u5c55\u6570\u636e\u7ed3\u6784\u4e0d\u4f1a\u5f15\u53d1\u8fde\u9501\u4fee\u6539\u3002<\/p>\n<h4>3.10.3 \u8fdb\u9636&#xff1a;\u6545\u610f\u628a\u5b83\u53d8\u6210\u5fc5\u586b&#xff08;\u5f3a\u70c8\u5efa\u8bae\u505a\u4e00\u6b21&#xff09;<\/h4>\n<p>\u628a &#061; &#034;&#034; \u53bb\u6389&#xff0c;\u8ba9\u5b83\u53d8\u6210\u5fc5\u586b\u5b57\u6bb5&#xff1a;<\/p>\n<p><span class=\"token keyword\">val<\/span> description<span class=\"token operator\">:<\/span> String    <span class=\"token comment\">\/\/ \u2190 \u53bb\u6389\u4e86\u9ed8\u8ba4\u503c<\/span><\/p>\n<p>\u518d\u7f16\u8bd1\u4e00\u6b21&#xff0c;\u4f60\u4f1a\u770b\u5230\u4e00\u4e32\u62a5\u9519&#xff0c;\u6307\u5411\u6240\u6709 ModelInfo(&#8230;) \u7684\u8c03\u7528\u70b9&#xff0c;\u7c7b\u4f3c&#xff1a;<\/p>\n<p>error: no value passed for parameter &#039;description&#039;<\/p>\n<p>\u8fd9\u4e2a\u5b9e\u9a8c\u7684\u4ef7\u503c&#xff1a;\u4f60\u4f1a\u76f4\u89c2\u5730\u770b\u5230&#034;\u9ed8\u8ba4\u53c2\u6570\u5982\u4f55\u4fdd\u62a4\u5df2\u6709\u8c03\u7528\u70b9&#034;\u3002<br \/>\n\u4ee5\u540e\u4f60\u8bbe\u8ba1\u6570\u636e\u7ed3\u6784\u65f6\u5c31\u4f1a\u660e\u767d\u2014\u2014\u7ed9\u65b0\u5b57\u6bb5\u52a0\u9ed8\u8ba4\u503c\u662f\u5411\u540e\u517c\u5bb9\u7684\u5173\u952e\u3002<\/p>\n<p>\u505a\u5b8c\u8bb0\u5f97\u628a &#061; &#034;&#034; \u52a0\u56de\u53bb&#xff08;\u6216\u8005\u5e72\u8106\u4fdd\u7559\u8fd9\u4e2a\u5b57\u6bb5&#xff0c;\u5f53\u4f5c\u4f60\u81ea\u5df1\u7684\u7b2c\u4e00\u4e2a\u6539\u52a8&#xff09;\u3002<\/p>\n<hr \/>\n<h3>3.11 \u5e38\u89c1\u9519\u8bef\u4e0e\u6392\u67e5<\/h3>\n<table>\n<tr>\u62a5\u9519\u4fe1\u606f&#xff08;\u4f60\u4f1a\u770b\u5230\u7684\u539f\u6587&#xff09;\u539f\u56e0\u600e\u4e48\u6539<\/tr>\n<tbody>\n<tr>\n<td>val cannot be reassigned<\/td>\n<td>\u7ed9 val \u91cd\u65b0\u8d4b\u503c\u4e86<\/td>\n<td>\u6539\u6210 var&#xff0c;\u6216\u8005\u6362\u4e2a\u65b0\u53d8\u91cf<\/td>\n<\/tr>\n<tr>\n<td>only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver<\/td>\n<td>\u5728\u53ef\u7a7a\u7c7b\u578b\u4e0a\u76f4\u63a5\u8c03\u65b9\u6cd5<\/td>\n<td>\u6539\u7528 ?. \u6216 ?: \u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n<tr>\n<td>null can not be a value of a non-null type String<\/td>\n<td>\u628a null \u8d4b\u7ed9\u975e\u7a7a\u7c7b\u578b<\/td>\n<td>\u7c7b\u578b\u540e\u52a0 ?&#xff0c;\u6216\u7ed9\u4e2a\u771f\u5b9e\u503c<\/td>\n<\/tr>\n<tr>\n<td>no value passed for parameter &#039;xxx&#039;<\/td>\n<td>\u5fc5\u586b\u53c2\u6570\u6ca1\u4f20<\/td>\n<td>\u4f20\u503c&#xff0c;\u6216\u7ed9\u5b83\u52a0\u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n<tr>\n<td>type mismatch: inferred type is Int but Long was expected<\/td>\n<td>\u7c7b\u578b\u4e0d\u5339\u914d&#xff08;\u5982\u628a Int \u5f53 Long \u7528&#xff09;<\/td>\n<td>\u663e\u5f0f\u8f6c\u6362&#xff1a;x.toLong()<\/td>\n<\/tr>\n<tr>\n<td>unresolved reference: xxx<\/td>\n<td>\u540d\u5b57\u4e0d\u5b58\u5728&#xff08;\u62fc\u9519 \/ \u6ca1 import&#xff09;<\/td>\n<td>\u68c0\u67e5\u62fc\u5199\u548c import<\/td>\n<\/tr>\n<tr>\n<td>function invocation &#039;xxx(&#8230;)&#039; expected<\/td>\n<td>\u628a\u5c5e\u6027\u5f53\u51fd\u6570\u8c03\u4e86&#xff08;\u6216\u53cd\u4e4b&#xff09;<\/td>\n<td>\u68c0\u67e5\u662f\u4e0d\u662f\u591a\u4e86\/\u5c11\u4e86 ()<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4cc; \u8bfb Kotlin \u62a5\u9519\u7684\u7ecf\u9a8c&#xff1a;<br \/>\nKotlin \u7f16\u8bd1\u5668&#xff08;\u5c24\u5176\u662f\u914d\u5408 IDE&#xff09;\u7684\u62a5\u9519\u901a\u5e38\u5f88\u51c6&#xff0c;\u800c\u4e14\u4f1a\u76f4\u63a5\u7ed9\u4f60&#034;quick fix&#034;\u3002<br \/>\n\u770b\u5230\u62a5\u9519\u5148\u8bfb\u7b2c\u4e00\u884c\u548c error: \u540e\u9762\u90a3\u53e5&#xff0c;\u518d\u5bf9\u7740\u4e0a\u8868\u627e\u3002<br \/>\n\u4e0d\u8981\u4e00\u770b\u5230\u7ea2\u8272\u5c31\u614c\u2014\u2014\u5927\u90e8\u5206\u662f\u4e0a\u9762\u8fd9\u51e0\u79cd\u4e4b\u4e00\u3002<\/p>\n<hr \/>\n<h3>3.12 \u52a8\u624b\u9a8c\u8bc1&#xff1a;\u786e\u8ba4\u4f60\u771f\u7684\u4f1a\u4e86<\/h3>\n<h4>3.12.1 \u7528 formatFileSize \u9a8c\u8bc1\u4f60\u7684\u7406\u89e3<\/h4>\n<p>\u4e0d\u7528\u8fd0\u884c App&#xff0c;\u7eaf\u63a8\u7b97&#xff1a;\u4e00\u4e2a 1,932,178,688 \u5b57\u8282\u7684\u6a21\u578b\u4f1a\u663e\u793a\u6210\u4ec0\u4e48&#xff1f;<\/p>\n<p>\u63a8\u7b97\u8fc7\u7a0b<br \/>\n1,932,178,688 B<br \/>\n\u00f71024 &#061; 1,886,893 B   \u2192 1,886,893.0 KB<br \/>\n\u00f71024 &#061; 1,842.67 KB   \u2192 1,842.7 MB<br \/>\n\u00f71024 &#061; 1.799 GB      \u2192 1.8 GB<\/p>\n<p>while \u4f1a\u4e00\u76f4\u9664\u5230 value &lt; 1024&#xff08;\u8fd9\u91cc\u662f 1.799&#xff09;\u4e14\u6ca1\u5230\u6700\u5927\u5355\u4f4d&#xff0c;<br \/>\nunit \u505c\u5728 3&#xff08;GB&#xff09;&#xff0c;\u6240\u4ee5\u8f93\u51fa 1.8 GB\u3002<\/p>\n<h4>3.12.2 \u9a8c\u8bc1\u7f16\u8bd1\u94fe\u8def\u901a\u4e86<\/h4>\n<p>\u6267\u884c 3.10 \u7684 gradlew :app:compileDebugKotlin&#xff0c;\u786e\u8ba4 BUILD SUCCESSFUL\u3002<br \/>\n\u8fd9\u4e00\u6b65\u540c\u65f6\u9a8c\u8bc1\u4e86&#xff1a;\u4f60\u7684 Kotlin \u6539\u52a8\u80fd\u8fdb\u5165\u7f16\u8bd1\u6d41\u7a0b&#xff08;ch02 \u7684\u73af\u5883\u662f\u597d\u7684&#xff09;\u3002<\/p>\n<hr \/>\n<h3>3.13 \u5c0f\u7ed3<\/h3>\n<table>\n<tr>\u6982\u5ff5\u4e00\u53e5\u8bdd\u5de5\u7a0b\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td>val \/ var<\/td>\n<td>\u53ea\u8bfb \/ \u8bfb\u5199&#xff0c;\u4f18\u5148 val<\/td>\n<td>ModelInfo \u5168\u5b57\u6bb5 val&#xff1b;\u5faa\u73af\u8ba1\u6570\u5668\u624d\u7528 var<\/td>\n<\/tr>\n<tr>\n<td>\u7a7a\u5b89\u5168 ?<\/td>\n<td>\u628a&#034;\u4f1a\u4e0d\u4f1a null&#034;\u5199\u8fdb\u7c7b\u578b<\/td>\n<td>it[TEMP_KEY] \u662f Float?<\/td>\n<\/tr>\n<tr>\n<td>?. \u5b89\u5168\u8c03\u7528<\/td>\n<td>null \u65f6\u6574\u4e2a\u8868\u8fbe\u5f0f\u8fd4\u56de null&#xff0c;\u4e0d\u5d29<\/td>\n<td>\u2014<\/td>\n<\/tr>\n<tr>\n<td>?: Elvis<\/td>\n<td>\u5de6\u8fb9\u4e3a null \u65f6\u7528\u53f3\u8fb9\u515c\u5e95<\/td>\n<td>?: DEFAULT_TEMPERATURE&#xff08;0.3&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>!! \u975e\u7a7a\u65ad\u8a00<\/td>\n<td>\u53d1\u8a93\u975e\u7a7a&#xff0c;\u9519\u4e86\u5c31\u5d29\u2014\u2014\u672c\u9879\u76ee\u51e0\u4e4e\u4e0d\u7528<\/td>\n<td>\u2014<\/td>\n<\/tr>\n<tr>\n<td>data class<\/td>\n<td>\u88c5\u6570\u636e\u7684\u7c7b&#xff0c;\u81ea\u5e26 equals\/hashCode\/toString\/copy<\/td>\n<td>ModelInfo\/Message\/ChatSession<\/td>\n<\/tr>\n<tr>\n<td>copy()<\/td>\n<td>\u6539\u90e8\u5206\u5b57\u6bb5\u3001\u5176\u4f59\u4e0d\u53d8&#xff0c;\u4ea7\u751f\u65b0\u5bf9\u8c61<\/td>\n<td>session.copy(messages &#061; &#8230;)<\/td>\n<\/tr>\n<tr>\n<td>\u4e0d\u53ef\u53d8\u66f4\u65b0<\/td>\n<td>\u65b0\u5f15\u7528\u624d\u80fd\u89e6\u53d1 Compose \u5237\u65b0<\/td>\n<td>ch06\u3001ch09<\/td>\n<\/tr>\n<tr>\n<td>\u6269\u5c55\u5c5e\u6027<\/td>\n<td>\u7ed9\u6ca1\u6e90\u7801\u7684\u7c7b\u52a0\u6210\u5458<\/td>\n<td>Context.dataStore&#xff08;AppSettings.kt:21&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>by \u59d4\u6258<\/td>\n<td>\u83b7\u53d6\/\u5b58\u50a8\u903b\u8f91\u4ea4\u7ed9\u522b\u4eba<\/td>\n<td>by preferencesDataStore\u3001by viewModels()<\/td>\n<\/tr>\n<tr>\n<td>object<\/td>\n<td>\u5355\u4f8b<\/td>\n<td>ThinkStripper<\/td>\n<\/tr>\n<tr>\n<td>const val<\/td>\n<td>\u7f16\u8bd1\u671f\u5e38\u91cf&#xff08;\u57fa\u672c\u7c7b\u578b\/String&#xff09;<\/td>\n<td>THEME_SYSTEM &#061; 0<\/td>\n<\/tr>\n<tr>\n<td>when<\/td>\n<td>\u5f3a\u5206\u652f&#xff0c;\u53ef\u4f5c\u8868\u8fbe\u5f0f&#xff0c;\u914d\u5408\u5bc6\u5c01\u7c7b\u514d else<\/td>\n<td>\u4e3b\u9898\u5224\u65ad\u3001\u72b6\u6001\u673a<\/td>\n<\/tr>\n<tr>\n<td>\u539f\u59cb\u5b57\u7b26\u4e32 &#034;&#034;&#034;<\/td>\n<td>\\\\ \u4e0d\u7528\u8f6c\u4e49<\/td>\n<td>Regex(&#034;&#034;&#034;(?s)\\\\s*&lt;think&gt;.*&#034;&#034;&#034;)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4f60\u73b0\u5728\u5df2\u7ecf\u80fd\u8bfb\u61c2\u672c\u9879\u76ee\u7ea6 80% \u7684 Kotlin\u3002\u5269\u4e0b 20%&#xff08;\u534f\u7a0b suspend\u3001Flow\u3001Composable&#xff09;<br \/>\n\u4f1a\u5728 ch06 \u4e4b\u540e\u4e13\u95e8\u8bb2\u2014\u2014\u5b83\u4eec\u4e0d\u662f&#034;\u8bed\u6cd5&#034;&#xff0c;\u800c\u662f&#034;\u600e\u4e48\u7ec4\u7ec7\u5f02\u6b65\u4e0e UI&#034;&#xff0c;\u662f\u672c\u9879\u76ee\u771f\u6b63\u7684\u96be\u70b9\u3002<\/p>\n<hr \/>\n<h3>3.14 \u672c\u7ae0\u4f60\u5b66\u4f1a\u4e86\u4ec0\u4e48<\/h3>\n<p>\u9010\u6761\u81ea\u6d4b\u3002\u4efb\u4f55\u4e00\u6761\u6253\u4e0d\u4e86\u52fe&#xff0c;\u56de\u5230\u5bf9\u5e94\u5c0f\u8282\u518d\u770b\u4e00\u904d\u3002<\/p>\n<ul>\n<li class=\"task-list-item\"> \u6211\u80fd\u8bf4\u6e05 val \u548c var \u7684\u533a\u522b&#xff0c;\u4ee5\u53ca\u4e3a\u4ec0\u4e48\u9ed8\u8ba4\u7528 val\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u7406\u89e3 val \u53ea\u662f&#034;\u53d8\u91cf\u4e0d\u80fd\u91cd\u65b0\u6307\u5411&#034;&#xff0c;\u4e0d\u4ee3\u8868\u5bf9\u8c61\u5185\u5bb9\u4e0d\u53d8\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u80fd\u8bfb\u61c2 String? \u91cc\u7684\u95ee\u53f7\u662f\u4ec0\u4e48\u610f\u601d\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u4f1a\u7528 ?. \u548c ?:&#xff0c;\u5e76\u77e5\u9053 !! \u4e3a\u4ec0\u4e48\u5371\u9669\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u80fd\u770b\u61c2 it[TEMP_KEY] ?: DEFAULT_TEMPERATURE \u8fd9\u4e00\u884c\u5728\u5e72\u4ec0\u4e48\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u77e5\u9053 data class \u81ea\u52a8\u5e2e\u6211\u751f\u6210\u4e86\u54ea\u4e9b\u4e1c\u897f\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u4f1a\u7528 copy() \u505a\u4e0d\u53ef\u53d8\u66f4\u65b0&#xff0c;\u5e76\u8bf4\u6e05\u5b83\u5bf9 UI \u5237\u65b0\u7684\u610f\u4e49\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u7406\u89e3\u4e3a\u4ec0\u4e48 List \u4e0d\u80fd add&#xff0c;\u4ee5\u53ca &#043; \u5bf9 List \u7684\u542b\u4e49\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u80fd\u770b\u61c2 Context.dataStore \u662f\u6269\u5c55\u5c5e\u6027\u3001by \u662f\u59d4\u6258\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u80fd\u8bfb\u61c2 formatFileSize \u7684\u6bcf\u4e00\u884c&#xff08;\u5305\u62ec units.lastIndex \u548c &#034;%.1f %s&#034;.format&#xff09;\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u4f1a\u7528 when \u5199\u5206\u652f&#xff0c;\u77e5\u9053\u5b83\u80fd\u5f53\u8868\u8fbe\u5f0f\u7528\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u77e5\u9053\u5bc6\u5c01\u7c7b &#043; when \u80fd\u514d\u9664 else \u5e76\u83b7\u5f97&#034;\u7a77\u5c3d\u6027\u68c0\u67e5&#034;\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u7406\u89e3 object \u5c31\u662f\u5355\u4f8b&#xff0c;\u4ee5\u53ca const val \u548c val \u7684\u533a\u522b\u3002<\/li>\n<li class=\"task-list-item\"> \u6211\u4eb2\u624b\u7ed9 ModelInfo \u52a0\u8fc7\u5b57\u6bb5\u5e76\u7f16\u8bd1\u901a\u8fc7&#xff0c;\u8fd8\u8bd5\u8fc7&#034;\u53bb\u6389\u9ed8\u8ba4\u503c&#034;\u770b\u62a5\u9519\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>3.15 \u7ec3\u4e60<\/h3>\n<h4>\u7ec3\u4e60 1&#xff1a;\u5b8c\u6210\u52a0\u5b57\u6bb5\u9a8c\u8bc1&#xff08;\u542b\u8fdb\u9636&#xff09;<\/h4>\n<p>\u6309 3.10 \u505a\u4e00\u904d&#xff1a;\u52a0 description \u5b57\u6bb5 \u2192 \u7f16\u8bd1\u901a\u8fc7 \u2192 \u53bb\u6389\u9ed8\u8ba4\u503c \u2192 \u770b\u62a5\u9519 \u2192 \u52a0\u56de\u9ed8\u8ba4\u503c\u3002<\/p>\n<p>\u89e3\u9898\u601d\u8def\u63d0\u793a<\/p>\n<p>\u91cd\u70b9\u662f\u7406\u89e3&#034;\u9ed8\u8ba4\u53c2\u6570 &#061; \u5411\u540e\u517c\u5bb9&#034;\u3002\u6ce8\u610f\u7f16\u8bd1\u547d\u4ee4\u7528 compileDebugKotlin \u800c\u4e0d\u662f<br \/>\nassembleRelease\u2014\u2014\u53ea\u7f16 Kotlin \u66f4\u5feb&#xff08;\u51e0\u5341\u79d2 vs \u4e24\u5206\u949f&#xff09;&#xff0c;\u591f\u7528\u6765\u9a8c\u8bc1\u8bed\u6cd5\u3002<\/p>\n<p>\u53c2\u8003\u7b54\u6848\u8981\u70b9<\/p>\n<ul>\n<li>\u5e26\u9ed8\u8ba4\u503c &#061; &#034;&#034;&#xff1a;BUILD SUCCESSFUL&#xff0c;\u6240\u6709\u5df2\u6709 ModelInfo(&#8230;) \u8c03\u7528\u70b9\u4e0d\u53d7\u5f71\u54cd\u3002<\/li>\n<li>\u53bb\u6389\u9ed8\u8ba4\u503c&#xff1a;\u6240\u6709 ModelInfo(&#8230;) \u8c03\u7528\u70b9\u62a5 no value passed for parameter &#039;description&#039;\u3002<\/li>\n<li>\u8fd9\u8bf4\u660e&#xff1a;\u65b0\u589e\u5b57\u6bb5\u65f6\u7ed9\u9ed8\u8ba4\u503c&#xff0c;\u662f\u8ba9\u6570\u636e\u7ed3\u6784\u53ef\u6f14\u8fdb\u7684\u5173\u952e\u624b\u6bb5\u3002<\/li>\n<li>\u5b9e\u9645\u5de5\u7a0b\u4e2d&#xff0c;\u4f60\u8fd8\u4f1a\u9700\u8981\u5728 UI \u6216\u5b58\u50a8\u903b\u8f91\u91cc\u771f\u6b63\u7528\u4e0a\u8fd9\u4e2a\u5b57\u6bb5&#xff08;\u6bd4\u5982\u663e\u793a\u6a21\u578b\u63cf\u8ff0&#xff09;&#xff0c;<br \/>\n\u90a3\u5c5e\u4e8e ch07\/ch11 \u7684\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<h4>\u7ec3\u4e60 2&#xff1a;\u7ed9 Message \u52a0\u65f6\u95f4\u6233<\/h4>\n<p>\u5728 Message.kt \u91cc\u7ed9 Message \u52a0\u4e00\u4e2a val timestamp: Long &#061; 0&#xff0c;\u7f16\u8bd1\u901a\u8fc7\u3002<br \/>\n\u7136\u540e\u601d\u8003&#xff1a;\u4e3a\u4ec0\u4e48\u8fd9\u4e2a\u503c\u8981\u5e26\u9ed8\u8ba4\u503c&#xff1f;<\/p>\n<p>\u89e3\u9898\u601d\u8def\u63d0\u793a<\/p>\n<p>\u60f3\u60f3 Message \u5728\u591a\u5c11\u4e2a\u5730\u65b9\u88ab\u521b\u5efa\u3002\u5982\u679c\u6539\u6210\u5fc5\u586b&#xff0c;\u4f60\u8981\u6539\u591a\u5c11\u5904&#xff1f;<\/p>\n<p>\u53c2\u8003\u7b54\u6848\u8981\u70b9<br \/>\n<span class=\"token keyword\">data<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token function\">Message<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> id<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> content<span class=\"token operator\">:<\/span> String<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> isUser<span class=\"token operator\">:<\/span> Boolean<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> timestamp<span class=\"token operator\">:<\/span> Long <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span>      <span class=\"token comment\">\/\/ \u2190 \u65b0\u589e&#xff0c;\u5e26\u9ed8\u8ba4\u503c<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<ul>\n<li>\u5e26\u9ed8\u8ba4\u503c \u2192 \u5df2\u6709\u521b\u5efa\u70b9\u5168\u90e8\u4e0d\u53d7\u5f71\u54cd&#xff0c;\u76f4\u63a5\u7f16\u8bd1\u901a\u8fc7\u3002<\/li>\n<li>\u5982\u679c\u6539\u5fc5\u586b \u2192 \u6240\u6709 Message(&#8230;) \u8c03\u7528\u70b9\u90fd\u8981\u8865\u53c2\u6570\u3002<\/li>\n<li>\u9ed8\u8ba4\u503c 0 \u7684\u542b\u4e49&#xff1a;\u201c\u672a\u77e5\/\u672a\u8bbe\u7f6e\u201d\u3002\u8bfb\u53d6\u65f6\u53ef\u7528 if (timestamp &gt; 0) \u5224\u65ad\u6709\u6ca1\u6709\u503c\u3002<br \/>\n\u8fd9\u4e5f\u662f\u672c\u9879\u76ee\u5904\u7406&#034;\u53ef\u9009\u5b57\u6bb5&#034;\u7684\u5e38\u89c1\u624b\u6cd5&#xff08;\u53e6\u4e00\u4e2a\u624b\u6cd5\u662f\u7528\u53ef\u7a7a\u7c7b\u578b Long?&#xff09;\u3002<\/li>\n<\/ul>\n<h4>\u7ec3\u4e60 3&#xff1a;\u6539\u5199\u4e00\u4e2a\u5faa\u73af<\/h4>\n<p>\u628a formatFileSize \u6539\u5199\u6210\u4e0d\u7528 while \u7684\u7248\u672c&#xff08;\u7528\u5bf9\u6570\u7b97\u51fa\u8be5\u9664\u51e0\u6b21 1024&#xff09;\u3002<\/p>\n<p>\u89e3\u9898\u601d\u8def\u63d0\u793a<\/p>\n<p>\u9700\u8981&#034;1024 \u7684\u51e0\u6b21\u65b9 \u2248 bytes&#034;&#xff0c;\u5c31\u662f\u6c42 log(bytes) \/ log(1024) \u518d\u5411\u4e0b\u53d6\u6574\u3002<br \/>\n\u522b\u5fd8\u4e86\u7528 coerceIn \u628a\u7ed3\u679c\u5939\u5728\u5408\u6cd5\u8303\u56f4\u5185&#xff08;\u9632\u6b62\u6570\u7ec4\u8d8a\u754c&#xff09;\u3002<\/p>\n<p>\u53c2\u8003\u7b54\u6848\u8981\u70b9<br \/>\n<span class=\"token keyword\">fun<\/span> <span class=\"token function\">formatFileSize<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token operator\">:<\/span> Long<span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> String <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>bytes <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;\u672a\u77e5\u5927\u5c0f&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">val<\/span> units <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">arrayOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal singleline\"><span class=\"token string\">&#034;B&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;KB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;MB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;GB&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;TB&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> unit <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1024.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">toInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">coerceIn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> units<span class=\"token punctuation\">.<\/span>lastIndex<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> value <span class=\"token operator\">&#061;<\/span> bytes<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">pow<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1024.0<\/span><span class=\"token punctuation\">,<\/span> unit<span class=\"token punctuation\">.<\/span><span class=\"token function\">toDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token string-literal singleline\"><span class=\"token string\">&#034;%.1f %s&#034;<\/span><\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">,<\/span> units<span class=\"token punctuation\">[<\/span>unit<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>coerceIn(0, units.lastIndex) \u628a\u7ed3\u679c\u5939\u5728 [0, 4]&#xff0c;\u7b49\u4ef7\u4e8e\u539f while \u7684&#034;\u5230\u9876\u5c31\u505c&#034;\u3002<\/li>\n<li>coerceIn \u662f Kotlin \u6807\u51c6\u5e93\u51fd\u6570&#xff0c;\u6bd4\u624b\u5199 maxOf(minOf(x, max), min) \u6e05\u6670\u5f97\u591a\u3002<\/li>\n<li>\u601d\u8003&#xff1a;\u4e24\u4e2a\u7248\u672c\u54ea\u4e2a\u66f4\u597d&#xff1f;\u539f\u7248 while \u66f4\u76f4\u767d\u3001\u6ca1\u6709\u6d6e\u70b9\u8bef\u5dee&#xff1b;<br \/>\n\u5bf9\u6570\u7248\u66f4\u77ed\u4f46\u5f15\u5165\u4e86\u6d6e\u70b9\u8fd0\u7b97\u3002\u672c\u9879\u76ee\u4fdd\u7559 while \u7248\u2014\u2014\u53ef\u8bfb\u6027\u4f18\u5148\u3002<br \/>\n\u8fd9\u4e5f\u63d0\u9192\u4f60&#xff1a;&#034;\u66f4\u77ed\u7684\u5199\u6cd5&#034;\u4e0d\u4e00\u5b9a\u66f4\u597d\u3002<\/li>\n<\/ul>\n<h4>\u7ec3\u4e60 4&#xff1a;\u6539\u5199\u904d\u5386\u65b9\u5f0f<\/h4>\n<p>\u628a ThinkStripper \u91cc\u7684<br \/>\nfor (tag in listOf(OPEN_TAG, CLOSE_TAG)) { &#8230; }<br \/>\n\u6539\u6210 listOf(OPEN_TAG, CLOSE_TAG).forEach { tag -&gt; &#8230; }&#xff0c;\u7f16\u8bd1\u9a8c\u8bc1\u4e24\u8005\u7b49\u4ef7\u3002<\/p>\n<p>\u89e3\u9898\u601d\u8def\u63d0\u793a<\/p>\n<p>forEach \u63a5\u53d7\u4e00\u4e2a Lambda\u3002\u6ce8\u610f&#xff1a;\u5728 for \u5faa\u73af\u91cc\u53ef\u4ee5\u7528 break\/continue&#xff0c;<br \/>\n\u4f46\u5728 forEach \u7684 Lambda \u91cc\u4e0d\u80fd\u7528 break&#xff08;\u8981\u7528 return&#064;forEach \u5b9e\u73b0 continue \u7684\u6548\u679c&#xff09;\u3002<br \/>\n\u672c\u9898\u7684\u5faa\u73af\u4f53\u91cc\u6ca1\u6709 break&#xff0c;\u6240\u4ee5\u76f4\u63a5\u6539\u662f\u5b89\u5168\u7684\u3002<\/p>\n<p>\u53c2\u8003\u7b54\u6848\u8981\u70b9<br \/>\n<span class=\"token function\">listOf<\/span><span class=\"token punctuation\">(<\/span>OPEN_TAG<span class=\"token punctuation\">,<\/span> CLOSE_TAG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span> <span class=\"token punctuation\">{<\/span> tag <span class=\"token operator\">-&gt;<\/span><br \/>\n    <span class=\"token keyword\">val<\/span> maxLen <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">minOf<\/span><span class=\"token punctuation\">(<\/span>tag<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> text<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>len <span class=\"token keyword\">in<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">..<\/span>maxLen<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>text<span class=\"token punctuation\">.<\/span><span class=\"token function\">endsWith<\/span><span class=\"token punctuation\">(<\/span>tag<span class=\"token punctuation\">.<\/span><span class=\"token function\">substring<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> best <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">maxOf<\/span><span class=\"token punctuation\">(<\/span>best<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u4e24\u8005\u8bed\u4e49\u7b49\u4ef7&#xff0c;\u90fd\u80fd\u7f16\u8bd1\u901a\u8fc7\u3002<\/li>\n<li>\u5dee\u522b&#xff1a;for \u66f4\u7075\u6d3b&#xff08;\u53ef break\/continue&#xff09;&#xff1b;forEach \u66f4&#034;\u51fd\u6570\u5f0f&#034;\u3001\u53ef\u4e0e\u5176\u4ed6\u9ad8\u9636\u51fd\u6570\u94fe\u5f0f\u7ec4\u5408\u3002<\/li>\n<li>\u672c\u9879\u76ee\u4fdd\u7559 for \u7248\u2014\u2014\u56e0\u4e3a\u8fd9\u91cc\u903b\u8f91\u7b80\u5355&#xff0c;for \u7684\u53ef\u8bfb\u6027\u66f4\u597d\u3002<\/li>\n<li>\u5ef6\u4f38&#xff1a;Kotlin \u7684\u60ef\u4f8b\u662f&#034;\u7b80\u5355\u904d\u5386\u7528 for&#xff0c;\u9700\u8981\u94fe\u5f0f\u7ec4\u5408&#xff08;map\/filter \u4e4b\u540e&#xff09;\u7528 forEach&#034;\u3002<\/li>\n<\/ul>\n<h4>\u7ec3\u4e60 5&#xff1a;\u8bfb\u61c2\u4e00\u6bb5\u4f60\u6ca1\u89c1\u8fc7\u7684\u4ee3\u7801<\/h4>\n<p>\u6253\u5f00 util\/AppSettings.kt&#xff0c;\u8bfb 43-53 \u884c\u7684\u51e0\u4e2a setter&#xff1a;<\/p>\n<p>\u2705 \u53d6\u81ea\u672c\u5de5\u7a0b \u2014\u2014 util\/AppSettings.kt:47<\/p>\n<p><span class=\"token keyword\">suspend<\/span> <span class=\"token keyword\">fun<\/span> <span class=\"token function\">setTemperature<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token operator\">:<\/span> Float<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> context<span class=\"token punctuation\">.<\/span>dataStore<span class=\"token punctuation\">.<\/span><span class=\"token function\">edit<\/span> <span class=\"token punctuation\">{<\/span> it<span class=\"token punctuation\">[<\/span>TEMP_KEY<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> v <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u56de\u7b54&#xff1a;<\/p>\n<li>suspend \u662f\u4ec0\u4e48\u610f\u601d&#xff1f;&#xff08;\u63d0\u793a&#xff1a;ch08 \u4f1a\u7ec6\u8bb2&#xff0c;\u73b0\u5728\u53ea\u9700\u77e5\u9053&#034;\u5b83\u53ea\u80fd\u5728\u534f\u7a0b\u91cc\u88ab\u8c03\u7528&#034;&#xff09;<\/li>\n<li>&#061; \u8868\u8fbe\u5f0f \u8fd9\u79cd\u5199\u6cd5\u53eb\u4ec0\u4e48&#xff1f;\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u4e0d\u5199 { return &#8230; }&#xff1f;<\/li>\n<li>edit { } \u7684\u5927\u62ec\u53f7\u91cc\u4e3a\u4ec0\u4e48\u80fd\u76f4\u63a5\u6539 it[TEMP_KEY]&#xff1f;<\/li>\n<p>\u89e3\u9898\u601d\u8def\u63d0\u793a<\/p>\n<p>\u7b2c 2 \u95ee&#xff1a;Kotlin \u7684&#034;\u5355\u8868\u8fbe\u5f0f\u51fd\u6570&#034;&#xff08;expression body&#xff09;\u3002<br \/>\n\u7b2c 3 \u95ee&#xff1a;\u8fd9\u662f&#034;\u5e26\u63a5\u6536\u8005\u7684 Lambda&#034;\u2014\u2014\u5927\u62ec\u53f7\u91cc\u7684 it \u5176\u5b9e\u53ef\u4ee5\u7701\u7565\u4e0d\u5199&#xff08;\u76f4\u63a5 TEMP_KEY \u4e0d\u884c&#xff0c;<br \/>\n\u4f46 preferences[TEMP_KEY] &#061; v \u8fd9\u79cd\u8981\u770b\u5177\u4f53\u7b7e\u540d&#xff09;\u3002\u56de\u5fc6 3.7.3 \u8bb2\u7684 it\u3002<\/p>\n<p>\u53c2\u8003\u7b54\u6848\u8981\u70b9<\/p>\n<li>suspend \u6807\u8bb0\u8fd9\u662f\u4e00\u4e2a&#034;\u53ef\u6302\u8d77\u51fd\u6570&#034;\u2014\u2014\u5b83\u6267\u884c\u5230\u4e00\u534a\u53ef\u4ee5\u6682\u505c\u3001\u8ba9\u51fa\u7ebf\u7a0b&#xff0c;<br \/>\n\u7b49\u8017\u65f6\u64cd\u4f5c\u5b8c\u6210\u518d\u7ee7\u7eed\u3002\u6240\u4ee5\u5b83\u53ea\u80fd\u5728\u534f\u7a0b&#xff08;\u6216\u5176\u4ed6 suspend \u51fd\u6570&#xff09;\u91cc\u8c03\u7528\u3002<br \/>\n\u8fd9\u662f Kotlin \u534f\u7a0b\u7684\u6838\u5fc3\u673a\u5236&#xff0c;ch08 \u4f1a\u7528\u6574\u6574\u4e00\u7ae0\u8bb2\u5b83\u3002<\/li>\n<li>&#061; \u8868\u8fbe\u5f0f \u53eb\u5355\u8868\u8fbe\u5f0f\u51fd\u6570&#xff08;expression body&#xff09;\u3002\u5f53\u51fd\u6570\u4f53\u53ea\u6709\u4e00\u4e2a\u8868\u8fbe\u5f0f\u65f6&#xff0c;<br \/>\n\u53ef\u4ee5\u7701\u7565 { } \u548c return&#xff0c;\u7528 &#061; \u8fde\u63a5\u3002\u8fd4\u56de\u503c\u7531\u8868\u8fbe\u5f0f\u7c7b\u578b\u63a8\u65ad\u3002<br \/>\n\u8fd9\u662f Kotlin \u8ba9\u4ee3\u7801\u53d8\u77ed\u7684\u5e38\u89c1\u624b\u6cd5&#xff08;\u672c\u9879\u76ee\u5927\u91cf\u4f7f\u7528&#xff09;\u3002<\/li>\n<li>edit { } \u7684\u5927\u62ec\u53f7\u662f\u4e00\u4e2a Lambda&#xff0c;it \u662f\u5b83\u7684\u9690\u5f0f\u53c2\u6570&#xff08;\u8fd9\u91cc\u662f MutablePreferences&#xff09;\u3002<br \/>\n\u8fd9\u4e2a Lambda \u7531 DataStore \u5e93\u8c03\u7528&#xff0c;\u5e93\u5728\u5408\u9002\u7684\u65f6\u673a\u628a\u53ef\u4fee\u6539\u7684 Preferences \u5bf9\u8c61\u4f20\u8fdb\u6765&#xff0c;<br \/>\n\u4f60\u5728\u91cc\u9762\u6539\u5b8c&#xff0c;\u5e93\u8d1f\u8d23\u5199\u56de\u78c1\u76d8\u3002\u8fd9\u5c31\u662f&#034;\u628a\u4e00\u6bb5\u4ee3\u7801\u4ea4\u7ed9\u5e93\u53bb\u6267\u884c&#034;\u7684\u6a21\u5f0f&#xff0c;<br \/>\n\u548c 3.6 \u8bb2\u7684\u59d4\u6258\u30013.7 \u8bb2\u7684\u9ad8\u9636\u51fd\u6570\u662f\u540c\u4e00\u4e2a\u601d\u60f3\u7684\u4e0d\u540c\u8868\u73b0\u3002<br \/>\n&#xff08;edit \u7684\u4e8b\u52a1\u8bed\u4e49\u89c1 ch11\u3002&#xff09;<\/li>\n<hr \/>\n<h3>3.16 \u81ea\u6d4b\u9898&#xff08;\u9644\u7b54\u6848&#xff09;<\/h3>\n<p>\u8fd9\u4e00\u7ae0\u7684\u81ea\u6d4b\u91cd\u70b9\u4e0d\u662f&#034;\u8bb0\u8bed\u6cd5&#034;&#xff0c;\u800c\u662f&#034;\u7406\u89e3\u4e3a\u4ec0\u4e48&#034;\u3002<br \/>\n\u6240\u4ee5\u4e0b\u9762\u7684\u7b80\u7b54\u9898\u6bd4\u5224\u65ad\u9898\u66f4\u91cd\u8981\u3002<\/p>\n<p>\u4e00\u3001\u5224\u65ad\u5bf9\u9519<\/p>\n<li>val \u58f0\u660e\u7684\u5bf9\u8c61&#xff0c;\u5b83\u7684\u5185\u90e8\u5185\u5bb9\u4e5f\u4e0d\u80fd\u6539\u3002<\/li>\n<li>\u672c\u9879\u76ee\u91cc\u51e0\u4e4e\u4e0d\u7528 !!\u3002<\/li>\n<li>session.messages.add(newMessage) \u53ef\u4ee5\u7ed9\u4e0d\u53ef\u53d8\u5217\u8868\u52a0\u5143\u7d20\u3002<\/li>\n<li>\u539f\u5730\u6539\u5217\u8868\u5185\u5bb9&#xff08;\u4e0d\u4ea7\u751f\u65b0\u5bf9\u8c61&#xff09;&#xff0c;Compose \u4e5f\u80fd\u5bdf\u89c9\u5230\u5e76\u5237\u65b0\u754c\u9762\u3002<\/li>\n<p>\u4e8c\u3001\u9009\u62e9<\/p>\n<li>it[TEMP_KEY] ?: DEFAULT_TEMPERATURE \u91cc ?: \u7684\u4f5c\u7528\u662f&#xff1f;<br \/>\nA. \u7c7b\u578b\u8f6c\u6362\u3000B. \u5de6\u8fb9\u4e3a null \u65f6\u7528\u53f3\u8fb9\u7684\u503c\u3000C. \u5f3a\u5236\u975e\u7a7a\u3000D. \u629b\u51fa\u5f02\u5e38<\/li>\n<li>Context.dataStore \u7528\u7684\u662f\u4ec0\u4e48\u8bed\u6cd5&#xff1f;<br \/>\nA. \u7ee7\u627f\u3000B. \u6269\u5c55\u5c5e\u6027\u3000C. \u63a5\u53e3\u5b9e\u73b0\u3000D. \u6cdb\u578b<\/li>\n<li>data class \u4f1a\u81ea\u52a8\u751f\u6210\u4e0b\u9762\u54ea\u4e2a&#xff1f;<br \/>\nA. copy()\u3000B. main()\u3000C. run()\u3000D. map()<\/li>\n<p>\u4e09\u3001\u7b80\u7b54<\/p>\n<li>\u4e3a\u4ec0\u4e48\u672c\u9879\u76ee&#034;\u80fd\u7528 val \u5c31\u7528 val&#034;&#xff1f;<\/li>\n<li>\u7ed9 data class \u52a0\u5b57\u6bb5\u65f6\u4e3a\u4ec0\u4e48\u8981\u5e26\u9ed8\u8ba4\u503c&#xff1f;<\/li>\n<li>\u4e3a\u4ec0\u4e48 copy() \u4f1a\u89e6\u53d1 Compose \u5237\u65b0&#xff0c;\u800c&#034;\u539f\u5730\u6539\u5b57\u6bb5&#034;\u4e0d\u4f1a&#xff1f;<\/li>\n<p>\u7b54\u6848\u4e0e\u89e3\u6790<\/p>\n<p>\u4e00\u3001\u5224\u65ad<\/p>\n<li>\u274c \u9519\u3002val \u53ea\u8868\u793a&#034;\u53d8\u91cf\u4e0d\u80fd\u91cd\u65b0\u6307\u5411\u522b\u7684\u5bf9\u8c61&#034;&#xff0c;<br \/>\n\u4e0d\u4ee3\u8868\u5bf9\u8c61\u5185\u90e8\u5185\u5bb9\u4e0d\u53ef\u53d8\u3002<br \/>\n\u7c7b\u6bd4&#xff1a;\u9065\u63a7\u5668\u88ab\u7c98\u5728\u8336\u51e0\u4e0a&#xff08;\u4e0d\u80fd\u6362&#xff09;&#xff0c;\u4f46\u6309\u94ae\u8fd8\u80fd\u6309&#xff08;3.3.1&#xff09;\u3002<\/li>\n<li>\u2705 \u5bf9\u3002\u56e0\u4e3a !! \u4e00\u65e6\u5224\u65ad\u5931\u8bef\u5c31 NPE \u5d29\u6e83&#xff0c;<br \/>\n\u672c\u9879\u76ee\u7528 ?. \/ ?: \u4ee3\u66ff&#xff08;3.4.5&#xff09;\u3002<\/li>\n<li>\u274c \u9519\u3002Kotlin \u7684 List \u662f\u53ea\u8bfb\u7684&#xff0c;\u6ca1\u6709 add\u3002<br \/>\n\u8981\u52a0\u5143\u7d20\u5f97\u7528 session.messages &#043; newMessage&#xff08;\u8fd4\u56de\u65b0\u5217\u8868&#xff09;&#xff0c;<br \/>\n\u6216\u8005\u7528 MutableList&#xff08;3.5.4&#xff09;\u3002<\/li>\n<li>\u274c \u9519\u3002Compose \u9760&#034;\u5f15\u7528\u662f\u5426\u53d8\u4e86&#034;\u5224\u65ad\u8981\u4e0d\u8981\u91cd\u753b\u3002<br \/>\n\u539f\u5730\u6539\u5217\u8868 \u2192 \u8fd8\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61 \u2192 Compose \u770b\u4e0d\u51fa\u53d8\u5316 \u2192 \u754c\u9762\u4e0d\u5237\u65b0&#xff08;3.5.5&#xff09;\u3002<\/li>\n<p>\u4e8c\u3001\u9009\u62e9<\/p>\n<li>B\u3002\u8fd9\u5c31\u662f Elvis \u8fd0\u7b97\u7b26&#xff1a;\u5de6\u8fb9\u4e3a null \u65f6\u7528\u53f3\u8fb9\u515c\u5e95&#xff08;3.4.3&#xff09;\u3002<\/li>\n<li>B&#xff08;\u6269\u5c55\u5c5e\u6027&#xff09;\u3002\u5b83\u7ed9 Android \u7684 Context \u52a0\u4e86\u4e00\u4e2a\u6210\u5458&#xff08;3.6.2&#xff09;\u3002<\/li>\n<li>A&#xff08;copy()&#xff09;\u3002data class \u8fd8\u81ea\u52a8\u751f\u6210 equals\/hashCode\/toString&#xff08;3.5.1&#xff09;\u3002<\/li>\n<p>\u4e09\u3001\u7b80\u7b54&#xff08;\u8981\u70b9&#xff09;<\/p>\n<li>\u56e0\u4e3a\u4e0d\u53ef\u53d8\u5bf9\u8c61\u5929\u7136\u6ca1\u6709\u8bfb\u5199\u7ade\u4e89\u95ee\u9898\u3002<br \/>\n\u672c\u9879\u76ee\u5927\u91cf\u4f7f\u7528\u534f\u7a0b&#xff08;ch08&#xff09;&#xff0c;\u5982\u679c\u5bf9\u8c61\u662f\u53ef\u53d8\u7684&#xff0c;\u5c31\u5f97\u5904\u5904\u52a0\u9501&#xff1b;<br \/>\n\u7528 val &#043; copy 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