{"id":54213,"date":"2025-08-12T23:59:50","date_gmt":"2025-08-12T15:59:50","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54213.html"},"modified":"2025-08-12T23:59:50","modified_gmt":"2025-08-12T15:59:50","slug":"java%e4%b8%ad%e9%9b%86%e5%90%88","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54213.html","title":{"rendered":"Java\u4e2d\u96c6\u5408"},"content":{"rendered":"<h2>\u96c6\u5408<\/h2>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u96c6\u5408<\/li>\n<li>\n<ul>\n<li>1.\u96c6\u5408\u57fa\u7840<\/li>\n<li>\n<ul>\n<li>1.1\u96c6\u5408\u6982\u8ff0<\/li>\n<li>1.2 ArrayList \u6784\u9020\u65b9\u6cd5\u548c\u6dfb\u52a0\u65b9\u6cd5<\/li>\n<li>1.3 ArrayList\u6210\u5458\u65b9\u6cd5<\/li>\n<li>1.3.1 \u57fa\u672c\u6570\u636e\u7c7b\u578b\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b<\/li>\n<li>1.4 \u7ec3\u4e60<\/li>\n<li>\n<ul>\n<li>1.4.1<\/li>\n<li>1.4.2<\/li>\n<li>1.4.3<\/li>\n<li>1.4.4<\/li>\n<li>1.4.5<\/li>\n<li>1.4.6<\/li>\n<li>1.4.7<\/li>\n<li>1.4.8<\/li>\n<li>1.4.9<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>1.\u96c6\u5408\u57fa\u7840<\/h3>\n<h4>1.1\u96c6\u5408\u6982\u8ff0<\/h4>\n<p>\u96c6\u5408\u7c7b\u7684\u7279\u70b9:\u63d0\u4f9b\u4e00\u79cd\u5b58\u50a8\u7a7a\u95f4\u53ef\u53d8\u7684\u5b58\u50a8\u6a21\u578b&#xff0c;\u5b58\u50a8\u7684\u6570\u636e\u5bb9\u91cf\u53ef\u4ee5\u53d1\u751f\u6539\u53d8\u96c6\u5408\u7c7b\u6709\u5f88\u591a<\/p>\n<p>ArrayList:<\/p>\n<ul>\n<li>\u53ef\u8c03\u6574\u5927\u5c0f\u7684\u6570\u7ec4\u5b9e\u73b0<\/li>\n<li>:\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6570\u636e\u7c7b\u578b&#xff0c;\u6cdb\u578b\u3002<\/li>\n<\/ul>\n<p>\u600e\u4e48\u7528? \u5728\u51fa\u73b0E\u7684\u5730\u65b9\u6211\u4eec\u4f7f\u7528\u5f15\u7528\u6570\u636e\u7c7b\u578b\u66ff\u6362\u5373\u53ef \u4e3e\u4f8b:ArrayList , ArrayList<\/p>\n<h4>1.2 ArrayList \u6784\u9020\u65b9\u6cd5\u548c\u6dfb\u52a0\u65b9\u6cd5<\/h4>\n<table>\n<tr>\u65b9\u6cd5\u540d\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">public ArrayList()<\/td>\n<td align=\"center\">\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u96c6\u5408\u5bf9\u8c61<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">public boolean add(E e)<\/td>\n<td align=\"center\">\u5c06\u6307\u5b9a\u7684\u5143\u7d20\u8ffd\u52a0\u5230\u6b21\u96c6\u5408\u7684\u672b\u5c3e<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">public void add(int index , E element)<\/td>\n<td align=\"center\">\u5728\u6b64\u96c6\u5408\u4e2d\u7684\u6307\u5b9a\u4f4d\u7f6e\u63d2\u5165\u6307\u5b9a\u7684\u5143\u7d20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u96c6\u5408\u548c\u6570\u7ec4\u7684\u5bf9\u6bd4<\/p>\n<li>\u6570\u7ec4\u957f\u5ea6\u56fa\u5b9a \u53ef\u4ee5\u5b58\u57fa\u672c\u6570\u636e\u7c7b\u578b \u53ef\u4ee5\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/li>\n<li>\u96c6\u5408\u957f\u5ea6\u53ef\u53d8 **\u53ef\u4ee5\u5b58\u5f15\u7528\u7c7b\u578b\u6570\u636e ** \u57fa\u672c\u6570\u636e\u7c7b\u578b&#8212;&#8212;&gt;\u5305\u88c5\u7c7b<\/li>\n<h4>1.3 ArrayList\u6210\u5458\u65b9\u6cd5<\/h4>\n<table>\n<tr>\u65b9\u6cd5\u540d\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"center\">boolean add(E e)<\/td>\n<td align=\"center\">\u6dfb\u52a0\u5143\u7d20&#xff0c;\u8fd4\u56de\u503c\u8868\u793a\u662f\u5426\u6dfb\u52a0\u6210\u529f<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">boolean remove(E e)<\/td>\n<td align=\"center\">\u5220\u9664\u6307\u5b9a\u5143\u7d20,\u8fd4\u56de\u503c\u8868\u793a\u662f\u5426\u5220\u9664\u6210\u529f<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">E remove(int index)<\/td>\n<td align=\"center\">\u5220\u9664\u6307\u5b9a\u7d22\u5f15\u7684\u5143\u7d20,\u8fd4\u56de\u88ab\u5220\u9664\u5143\u7d20<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">E set(int index,E e)<\/td>\n<td align=\"center\">\u4fee\u6539\u6307\u5b9a\u7d22\u5f15\u4e0b\u7684\u5143\u7d20,\u8fd4\u56de\u539f\u6765\u7684\u5143\u7d20<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">E get(int index)<\/td>\n<td align=\"center\">\u83b7\u53d6\u6307\u5b9a\u7d22\u5f15\u7684\u5143\u7d20<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">int size()<\/td>\n<td align=\"center\">\u96c6\u5408\u7684\u957f\u5ea6&#xff0c;\u4e5f\u5c31\u662f\u96c6\u5408\u4e2d\u5143\u7d20\u7684\u4e2a\u6570<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u589e\u5220\u6539\u67e5<\/span><br \/>\n            <span class=\"token comment\">\/*<\/p>\n<p>            boolean add(E e)          \u6dfb\u52a0<\/p>\n<p>            boolean remove(Ee)          \u5220\u9664<br \/>\n            E remove(int index)<\/p>\n<p>            E set(int index,E e)         \u4fee\u6539<\/p>\n<p>            E get(int index)            \u67e5\u8be2<br \/>\n            int size()                  \u83b7\u53d6\u957f\u5ea6<\/p>\n<p>            *\/<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ArrayListdemo02<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u589e<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;aaa&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bbb&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ccc&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ddd&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5220<\/span><br \/>\n      <span class=\"token keyword\">boolean<\/span> result1<span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;aaa&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token class-name\">String<\/span> st<span class=\"token operator\">&#061;<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>st<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u6539<\/span><br \/>\n        <span class=\"token comment\">\/*String result2 &#061;*\/<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;fff&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u67e5<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> s<span class=\"token operator\">&#061;<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>         <span class=\"token comment\">\/\/\u904d\u5386<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/i\u7d22\u5f15<\/span><br \/>\n            <span class=\"token comment\">\/\/list.get(i)    \u5143\u7d20<\/span><br \/>\n           <span class=\"token class-name\">String<\/span> s1<span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155944-689b64f0eb7a7.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u904d\u5386<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155946-689b64f2435ef.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>1.3.1 \u57fa\u672c\u6570\u636e\u7c7b\u578b\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b<\/h4>\n<p>\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b<\/p>\n<table>\n<tr>byteByte<\/tr>\n<tbody>\n<tr>\n<td>short<\/td>\n<td>Short<\/td>\n<\/tr>\n<tr>\n<td>char<\/td>\n<td>Character<\/td>\n<\/tr>\n<tr>\n<td>int<\/td>\n<td>Integer<\/td>\n<\/tr>\n<tr>\n<td>long<\/td>\n<td>Long<\/td>\n<\/tr>\n<tr>\n<td>float<\/td>\n<td>Float<\/td>\n<\/tr>\n<tr>\n<td>double<\/td>\n<td>Double<\/td>\n<\/tr>\n<tr>\n<td>boolean<\/td>\n<td>Boolean<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>1.4 \u7ec3\u4e60<\/h4>\n<h5>1.4.1<\/h5>\n<li>\u9700\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u6dfb\u52a0\u5b57\u7b26\u4e32&#xff0c;\u5e76\u8fdb\u884c\u904d\u5386\u904d\u5386\u683c\u5f0f\u53c2\u7167:[\u5143\u7d201,\u5143\u7d202,\u5143\u7d203]\u3002<\/li>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ArrayListdemo03<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u521b\u5efa\u6570\u7ec4<\/span><br \/>\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/2.\u589e\u52a0\u6570\u7ec4<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f60\u5728\u5e72\u561b&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u70b9\u8d5e\u4e86\u5417&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8f6c\u53d1\u4e86\u5417&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/3.\u904d\u5386<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;,&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;]&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155946-689b64f29fd8d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.2<\/h5>\n<li>\u7ec3\u4e60<\/li>\n<p>\u6dfb\u52a0\u6570\u5b57\u5e76\u904d\u5386 \u9700\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u6dfb\u52a0\u6570\u5b57&#xff0c;\u5e76\u8fdb\u884c\u904d\u5386\u3002 \u904d\u5386\u683c\u5f0f\u53c2\u7167:[\u5143\u7d201,\u5143\u7d202,\u5143\u7d203]\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u6dfb\u52a0\u6570\u5b57\u5e76\u904d\u5386   \u9700\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u6dfb\u52a0\u6570\u5b57&#xff0c;\u5e76\u8fdb\u884c\u904d\u5386\u3002<\/span><br \/>\n        <span class=\"token comment\">\/\/\u904d\u5386\u683c\u5f0f\u53c2\u7167:[\u5143\u7d201,\u5143\u7d202,\u5143\u7d203]\u3002<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> test1 <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u521b\u5efa\u6570\u7ec4<\/span><br \/>\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/2.\u589e\u52a0\u6570\u5b57<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/3.\u904d\u5386\u6570\u7ec4<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i<span class=\"token operator\">&#061;&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;,&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;]&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155946-689b64f2d00e5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.3<\/h5>\n<p>3.\u7ec3\u4e60<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> test2 <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/add<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;a&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;b&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;c&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;d&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;e&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u904d\u5386<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i<span class=\"token operator\">&#061;&#061;<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;,&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;]&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155947-689b64f31110e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.4<\/h5>\n<p>4.\u7ec3\u4e60<\/p>\n<p>\u9700\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u6dfb\u52a0\u4e00\u4e9b\u5b66\u751f\u5bf9\u8c61&#xff0c;\u5e76\u8fdb\u884c\u904d\u5386 \u5b66\u751f\u7c7b\u7684\u5c5e\u6027\u4e3a:\u59d3\u540d&#xff0c;\u5e74\u9f84\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/javabean<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u79c1\u6709\u5316\u6210\u5458\u53d8\u91cf<\/span><br \/>\n        <span class=\"token comment\">\/\/ 2.\u7a7a\u53c2\u6784\u9020\u65b9\u6cd5<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3.\u5e26\u5168\u90e8\u53c2\u6570\u7684\u6784\u9020\u65b9\u6cd5<\/span><br \/>\n        <span class=\"token comment\">\/\/ 4.get\/set\u65b9\u6cd5<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Student<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&#061;<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&#061;<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u9700\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u6dfb\u52a0\u4e00\u4e9b\u5b66\u751f\u5bf9\u8c61&#xff0c;\u5e76\u8fdb\u884c\u904d\u5386    \u5b66\u751f\u7c7b\u7684\u5c5e\u6027\u4e3a:\u59d3\u540d&#xff0c;\u5e74\u9f84\u3002<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> test3 <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u521b\u5efa\u96c6\u5408<\/span><br \/>\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/2.\u6dfb\u52a0\u5b66\u751f\u5bf9\u8c61<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8d75&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">11<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u94b1&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b59&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">13<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Student<\/span> s4 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u674e&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">14<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/3.\u6dfb\u52a0\u5143\u7d20<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s4<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/4.\u904d\u5386<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/i \u7d22\u5f15 list.get(i) \u5143\u7d20\/\u5b66\u751f\u5bf9\u8c61<\/span><br \/>\n            <span class=\"token class-name\">Student<\/span> stu <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>stu<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;,&#034;<\/span><span class=\"token operator\">&#043;<\/span>stu<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155947-689b64f36c223.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.5<\/h5>\n<p>5.\u7ec3\u4e60<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> test4 <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u521b\u5efa\u96c6\u5408<\/span><br \/>\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/2.\u952e\u76d8\u5f55\u5165\u5b66\u751f\u7684\u4fe1\u606f\u5e76\u6dfb\u52a0\u5230\u96c6\u5408\u5f53\u4e2d<\/span><br \/>\n        <span class=\"token class-name\">Scanner<\/span> scanner <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/\u5bf9\u8c61\u7c7b\u578b \u5bf9\u8c61\u540d&#061;\u5bf9\u8c61\u503c<\/span><br \/>\n            <span class=\"token class-name\">Student<\/span> s<span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Student<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u5b66\u751f\u59d3\u540d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u5e74\u9f84&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> age<span class=\"token operator\">&#061;<\/span> scanner<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u628aname\u548cage\u8d4b\u503c\u7ed9\u5b66\u751f\u5bf9\u8c61<\/span><br \/>\n            s<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAge<\/span><span class=\"token punctuation\">(<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            s<span class=\"token punctuation\">.<\/span><span class=\"token function\">setName<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u628a\u5b66\u751f\u5bf9\u8c61\u6dfb\u52a0\u5230\u96c6\u5408\u4e2d<\/span><br \/>\n            list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/\u904d\u5386<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i1 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i1 <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i1<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/\u6570\u636e\u7c7b\u578bStudent   \u53d8\u91cf\u540dstu<\/span><br \/>\n            <span class=\"token comment\">\/\/list \u7c7b\u578b\u7684\u96c6\u5408  \u4ecelist\u96c6\u5408\u4e2d \u53d6\u51fa\u7d22\u5f15\u4e3ai1\u7684\u5143\u7d20 &#xff0c;\u628a\u4ed6\u5f3a\u5236\u8f6c\u6362\u4e3aStudent\u7c7b\u578b \u7136\u540e\u8d4b\u503c\u7ed9\u53d8\u91cfstu(\u7528stu\u63a5\u6536\u8fd9\u4e2a\u5bf9\u8c61)<\/span><br \/>\n            <span class=\"token class-name\">Student<\/span> stu<span class=\"token operator\">&#061;<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>stu<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;,&#034;<\/span><span class=\"token operator\">&#043;<\/span>stu<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155947-689b64f386dcd.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.6<\/h5>\n<p>6.\u7ec3\u4e60<\/p>\n<p>\u9700\u6c42: 1&#xff0c;main\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u5b58\u5165\u4e09\u4e2a\u7528\u6237\u5bf9\u8c61\u3002 \u7528\u6237\u5c5e\u6027\u4e3a:id&#xff0c;username&#xff0c;password 2&#xff0c;\u8981\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u6839\u636eid\u67e5\u627e\u5bf9\u5e94\u7684\u7528\u6237\u4fe1\u606f&#xff0c; \u5982\u679c\u5b58\u5728&#xff0c;\u8fd4\u56detrue \u5982\u679c\u4e0d\u5b58\u5728&#xff0c;\u8fd4\u56defalse<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u79c1\u6709\u5316\u6210\u5458\u53d8\u91cf<\/span><br \/>\n        <span class=\"token comment\">\/\/ 2.\u7a7a\u53c2\u6784\u9020\u65b9\u6cd5<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3.\u5e26\u5168\u90e8\u53c2\u6570\u7684\u6784\u9020\u65b9\u6cd5<\/span><br \/>\n        <span class=\"token comment\">\/\/ 4.get\/set\u65b9\u6cd5<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> password<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> id<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> password<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">&#061;<\/span> id<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>password <span class=\"token operator\">&#061;<\/span> password<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id <span class=\"token operator\">&#061;<\/span> id<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getPassword<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> password<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setPassword<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> password<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>password <span class=\"token operator\">&#061;<\/span> password<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u6dfb\u52a0\u7528\u6237\u5bf9\u8c61\u5e76\u5224\u65ad\u662f\u5426\u5b58\u5728<\/span><br \/>\n        <span class=\"token comment\">\/\/\u9700\u6c42:<\/span><br \/>\n        <span class=\"token comment\">\/\/1&#xff0c;main\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u5b58\u5165\u4e09\u4e2a\u7528\u6237\u5bf9\u8c61\u3002<\/span><br \/>\n        <span class=\"token comment\">\/\/\u7528\u6237\u5c5e\u6027\u4e3a:id&#xff0c;username&#xff0c;password<\/span><br \/>\n        <span class=\"token comment\">\/\/2&#xff0c;\u8981\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u6839\u636eid\u67e5\u627e\u5bf9\u5e94\u7684\u7528\u6237\u4fe1\u606f&#xff0c;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5982\u679c\u5b58\u5728&#xff0c;\u8fd4\u56detrue<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5982\u679c\u4e0d\u5b58\u5728&#xff0c;\u8fd4\u56defalse<\/span><br \/>\n        <span class=\"token comment\">\/\/<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> test5 <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/1.\u521b\u5efa\u6570\u7ec4<\/span><br \/>\n                <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/2.\u521b\u5efa\u4e09\u4e2a\u7528\u6237\u5bf9\u8c61<\/span><br \/>\n                <span class=\"token class-name\">User<\/span> u1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;10001&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhao&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">123456<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">User<\/span> u2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;10002&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhang&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1234567<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">User<\/span> u3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;10003&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;li&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1234561<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/3.\u628a\u7528\u6237\u5bf9\u8c61\u6dfb\u52a0\u5230\u96c6\u5408\u4e2d\u53bb<\/span><br \/>\n                list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>u1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>u2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>u3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/4.\u8c03\u7528\u65b9\u6cd5\u67e5\u770bid\u662f\u5426\u5b58\u5728<\/span><\/p>\n<p>                <span class=\"token keyword\">boolean<\/span> flag<span class=\"token operator\">&#061;<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;10001&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/5.\u6253\u5370\u7ed3\u679c<\/span><\/p>\n<p>            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/1.\u6211\u8981\u5e72\u561b                    \u6839\u636eid\u67e5\u627e\u7528\u6237<\/span><br \/>\n            <span class=\"token comment\">\/\/2.\u6211\u5e72\u8fd9\u4ef6\u4e8b\u9700\u8981\u4ec0\u4e48\u624d\u80fd\u5b8c\u6210      \u5728list\u4e2d\u627eid<\/span><br \/>\n            <span class=\"token comment\">\/\/3.\u8c03\u7528\u5904\u662f\u5426\u9700\u8981\u4f7f\u7528\u65b9\u6cd5\u7684\u7ed3\u679c     \u8fd4\u56de<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list<span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span> id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                  <span class=\"token class-name\">User<\/span> u<span class=\"token operator\">&#061;<\/span>  list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u62ff\u5230\u96c6\u5408\u91cc\u9762\u6bcf\u4e00\u4e2a\u7528\u6237<\/span><br \/>\n                  <span class=\"token class-name\">String<\/span> uid<span class=\"token operator\">&#061;<\/span> u<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8c03\u7528 id &#xff0c;\u628aid\u62ff\u51fa\u6765<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u5c06uid\u548c\u8981\u67e5\u627e\u7684id\u4f5c\u6bd4\u8f83<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>uid<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>id<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 boolean\">true<\/span><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> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155948-689b64f40792a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.7<\/h5>\n<p>7.\u7ec3\u4e60<\/p>\n<p>\u9700\u6c42: 1&#xff0c;main\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u5b58\u5165\u4e09\u4e2a\u7528\u6237\u5bf9\u8c61\u3002<\/p>\n<p>\u200b \u7528\u6237\u5c5e\u6027\u4e3a:id&#xff0c;username&#xff0c;password 2&#xff0c;\u8981\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u6839\u636eid\u67e5\u627e\u5bf9\u5e94\u7684\u7528\u6237\u4fe1\u606f\u3002\u5982\u679c\u5b58\u5728&#xff0c;\u8fd4\u56de\u7d22\u5f15 \u5982\u679c\u4e0d\u5b58\u5728&#xff0c;\u8fd4\u56de-1<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u9700\u6c42:<\/span><br \/>\n        <span class=\"token comment\">\/\/1&#xff0c;main\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u5b58\u5165\u4e09\u4e2a\u7528\u6237\u5bf9\u8c61\u3002<\/span><br \/>\n        <span class=\"token comment\">\/\/<\/span><br \/>\n        <span class=\"token comment\">\/\/\u7528\u6237\u5c5e\u6027\u4e3a:id&#xff0c;username&#xff0c;password<\/span><br \/>\n        <span class=\"token comment\">\/\/2&#xff0c;\u8981\u6c42:\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u6839\u636eid\u67e5\u627e\u5bf9\u5e94\u7684\u7528\u6237\u4fe1\u606f\u3002\u5982\u679c\u5b58\u5728&#xff0c;\u8fd4\u56de\u7d22\u5f15<\/span><br \/>\n        <span class=\"token comment\">\/\/<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5982\u679c\u4e0d\u5b58\u5728&#xff0c;\u8fd4\u56de-1<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> test6 <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u521b\u5efa\u6570\u7ec4<\/span><br \/>\n        <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/2.\u521b\u5efa\u4e09\u4e2a\u7528\u6237\u5bf9\u8c61<\/span><br \/>\n        <span class=\"token class-name\">User<\/span> u1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;10001&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhao&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">123456<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">User<\/span> u2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;10002&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhang&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1234567<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">User<\/span> u3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;10003&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;li&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1234561<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/3.\u628a\u7528\u6237\u5bf9\u8c61\u6dfb\u52a0\u5230\u96c6\u5408\u4e2d\u53bb<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>u1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>u2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>u3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/4.\u67e5\u627e\u7d22\u5f15<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> <span class=\"token class-name\">Index<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token function\">getIndex<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;10001&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Index<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u96c6\u5408               \u8981\u67e5\u627e\u7684id<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getIndex<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list<span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span> id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">User<\/span> u<span class=\"token operator\">&#061;<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u62ff\u5230\u96c6\u5408\u91cc\u9762\u6bcf\u4e00\u4e2a\u7528\u6237<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> uId<span class=\"token operator\">&#061;<\/span>u<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8c03\u7528 id &#xff0c;\u628aid\u62ff\u51fa\u6765<\/span><br \/>\n            <span class=\"token comment\">\/\/\u5c06uId\u548c\u8981\u67e5\u627e\u7684id\u4f5c\u6bd4\u8f83<\/span><br \/>\n             <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>uId<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">return<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><br \/>\n     <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155948-689b64f4a5211.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.8<\/h5>\n<p>8.\u7ec3\u4e60<\/p>\n<p>\u6dfb\u52a0\u624b\u673a\u5bf9\u8c61\u5e76\u8fd4\u56de\u8981\u6c42\u7684\u6570\u636e \u9700\u6c42: \u5b9a\u4e49Javabean\u7c7b:Phone Phone\u5c5e\u6027:\u54c1\u724c&#xff0c;\u4ef7\u683c\u3002 main\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u5b58\u5165\u4e09\u4e2a\u624b\u673a\u5bf9\u8c61\u3002 \u5206\u522b\u4e3a:\u5c0f\u7c73&#xff0c;1000\u3002\u82f9\u679c&#xff0c;8000\u3002\u9524\u5b502999. \u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u5c06\u4ef7\u683c\u4f4e\u4e8e3000\u7684\u624b\u673a\u4fe1\u606f\u8fd4\u56de<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/javabean<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u79c1\u6709\u5316\u6210\u5458\u53d8\u91cf<\/span><br \/>\n        <span class=\"token comment\">\/\/ 2.\u7a7a\u53c2\u6784\u9020\u65b9\u6cd5<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3.\u5e26\u5168\u90e8\u53c2\u6570\u7684\u6784\u9020\u65b9\u6cd5<\/span><br \/>\n        <span class=\"token comment\">\/\/ 4.get\/set\u65b9\u6cd5<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/Phone\u5c5e\u6027:\u54c1\u724c&#xff0c;\u4ef7\u683c\u3002<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Phone<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> brand<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> price<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> brand<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> price<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>brand <span class=\"token operator\">&#061;<\/span> brand<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>price <span class=\"token operator\">&#061;<\/span> price<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getBrand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> brand<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setBrand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> brand<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>brand <span class=\"token operator\">&#061;<\/span> brand<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> price<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> price<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>price <span class=\"token operator\">&#061;<\/span> price<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Gather<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u6dfb\u52a0\u624b\u673a\u5bf9\u8c61\u5e76\u8fd4\u56de\u8981\u6c42\u7684\u6570\u636e<\/span><br \/>\n    <span class=\"token comment\">\/\/\u9700\u6c42:<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5b9a\u4e49Javabean\u7c7b:Phone<\/span><br \/>\n    <span class=\"token comment\">\/\/Phone\u5c5e\u6027:\u54c1\u724c&#xff0c;\u4ef7\u683c\u3002<\/span><br \/>\n    <span class=\"token comment\">\/\/main\u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u96c6\u5408&#xff0c;\u5b58\u5165\u4e09\u4e2a\u624b\u673a\u5bf9\u8c61\u3002<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5206\u522b\u4e3a:\u5c0f\u7c73&#xff0c;1000\u3002\u82f9\u679c&#xff0c;8000\u3002\u9524\u5b502999.<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u5c06\u4ef7\u683c\u4f4e\u4e8e3000\u7684\u624b\u673a\u4fe1\u606f\u8fd4\u56de<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> test7 <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/1.\u521b\u5efa\u6570\u7ec4<\/span><br \/>\n            <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/2.\u5b58\u5165\u5bf9\u8c61<\/span><br \/>\n            <span class=\"token class-name\">Phone<\/span> p1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;xiaomi&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">Phone<\/span> p2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;iphone&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">Phone<\/span> p3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;chuizi&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/3.\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d<\/span><br \/>\n            list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>p1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>p2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>p3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/4.\u8c03\u7528<\/span><br \/>\n           <span class=\"token comment\">\/\/ GetPhoneInfo(list);<\/span><br \/>\n            <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> phoneInfoList <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">GetPhoneInfo<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/5.\u904d\u5386\u96c6\u5408<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> phoneInfoList<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">Phone<\/span> phone <span class=\"token operator\">&#061;<\/span> phoneInfoList<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>phone<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBrand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token string\">&#034;,&#034;<\/span><span class=\"token operator\">&#043;<\/span>phone<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/1.\u6211\u8981\u5e72\u561b                    \u6839\u636e\u4ef7\u683c\u8fd4\u56de\u624b\u673a\u4fe1\u606f<\/span><br \/>\n        <span class=\"token comment\">\/\/2.\u6211\u5e72\u8fd9\u4ef6\u4e8b\u9700\u8981\u4ec0\u4e48\u624d\u80fd\u5b8c\u6210      \u5728list\u4e2d\u627e\u4f4e\u4e8e3000\u4ef7\u683c\u7684\u624b\u673a<\/span><br \/>\n        <span class=\"token comment\">\/\/3.\u8c03\u7528\u5904\u662f\u5426\u9700\u8981\u4f7f\u7528\u65b9\u6cd5\u7684\u7ed3\u679c     \u8fd4\u56de<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u6280\u5de7<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5982\u679c\u6211\u4eec\u8981\u8fd4\u56de\u591a\u4e2a\u6570\u636e&#xff0c;\u53ef\u4ee5\u628a\u8fd9\u4e9b\u6570\u636e\u653e\u5230\u4e00\u4e2a\u5bb9\u5668\u5f53\u4e2d&#xff0c;\u518d\u628a\u5bb9\u5668\u8fd4\u56de<\/span><br \/>\n    <span class=\"token comment\">\/\/\u96c6\u5408 \u6570\u7ec4<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/public static void GetPhoneInfo(ArrayList&lt;Phone&gt; list){<\/span><br \/>\n        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token class-name\">GetPhoneInfo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Phone<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> resultList <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n               <span class=\"token class-name\">Phone<\/span> p<span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n               <span class=\"token keyword\">int<\/span> price<span class=\"token operator\">&#061;<\/span>p<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n               <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>price<span class=\"token operator\">&lt;<\/span><span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token comment\">\/\/  System.out.println(p.getBrand()&#043;&#034;,&#034;&#043;p.getPrice());<\/span><br \/>\n                   resultList<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n               <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">return<\/span> resultList<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812155949-689b64f50edcd.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h5>1.4.9<\/h5>\n<p>\u665a\u4e0a\u597d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb229\u6b21\uff0c\u70b9\u8d5e11\u6b21\uff0c\u6536\u85cf4\u6b21\u3002\u672c\u6587\u4ecb\u7ecd\u4e86Java\u96c6\u5408\u6846\u67b6\u4e2d\u7684ArrayList\u57fa\u7840\u7528\u6cd5\uff0c\u4e3b\u8981\u5305\u62ec\uff1a \u96c6\u5408\u6982\u8ff0 ArrayList\u662f\u53ef\u8c03\u6574\u5927\u5c0f\u7684\u6570\u7ec4\u5b9e\u73b0 \u4f7f\u7528\u6cdb\u578b&lt;E&gt;\uff0c\u9700\u7528\u5f15\u7528\u6570\u636e\u7c7b\u578b\u66ff\u6362 \u5e38\u7528\u65b9\u6cd5 \u6784\u9020\u65b9\u6cd5\uff1aArrayList() \u6dfb\u52a0\u5143\u7d20\uff1aadd(E e)\/add(int index,E e) \u5220\u9664\u5143\u7d20\uff1aremove(E e)\/remove(int index) \u4fee\u6539\u5143\u7d20\uff1aset(int index,E e) \u67e5\u8be2\u5143\u7d20\uff1aget(int index) \u83b7\u53d6\u957f\u5ea6\uff1asize() \u57fa\u672c\u6570\u636e\u7c7b\u578b\u5305\u88c5\u7c7b \u5982int\u5bf9\u5e94Integer\uff0c<\/p>\n","protected":false},"author":2,"featured_media":54203,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,149,190],"topic":[],"class_list":["post-54213","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-windows","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - 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