{"id":59424,"date":"2026-01-13T20:49:08","date_gmt":"2026-01-13T12:49:08","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/59424.html"},"modified":"2026-01-13T20:49:08","modified_gmt":"2026-01-13T12:49:08","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e8%a6%81%e6%9c%89%e5%8c%85%e8%a3%85%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/59424.html","title":{"rendered":"\u4e3a\u4ec0\u4e48\u8981\u6709\u5305\u88c5\u7c7b"},"content":{"rendered":"<h4>\u4e00\u3001\u5148\u660e\u786e\u6838\u5fc3\u6982\u5ff5<\/h4>\n<ul>\n<li>\u57fa\u672c\u6570\u636e\u7c7b\u578b&#xff1a;Java \u539f\u751f\u7684 8 \u79cd\u7b80\u5355\u7c7b\u578b&#xff08;byte\/short\/int\/long\/float\/double\/char\/boolean&#xff09;&#xff0c;\u4e0d\u5c5e\u4e8e\u5bf9\u8c61&#xff0c;\u5b58\u50a8\u5728\u6808\u4e2d&#xff0c;\u8f7b\u91cf\u3001\u8fd0\u7b97\u5feb&#xff0c;\u4f46\u529f\u80fd\u5355\u4e00\u3002<\/li>\n<li>\u5305\u88c5\u7c7b&#xff1a;\u4e3a\u6bcf\u4e00\u79cd\u57fa\u672c\u7c7b\u578b\u8bbe\u8ba1\u7684\u5bf9\u5e94\u7684\u7c7b&#xff08;\u5982Integer\u5bf9\u5e94int\u3001Double\u5bf9\u5e94double&#xff09;&#xff0c;\u5c5e\u4e8ejava.lang\u5305\u4e0b\u7684\u5bf9\u8c61&#xff0c;\u5b58\u50a8\u5728\u5806\u4e2d&#xff0c;\u5177\u5907\u5bf9\u8c61\u7684\u6240\u6709\u7279\u6027&#xff08;\u53ef\u8c03\u7528\u65b9\u6cd5\u3001\u53ef\u8d4b\u503c\u4e3anull\u7b49&#xff09;\u3002<\/li>\n<\/ul>\n<h4>\u4e8c\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u5305\u88c5\u7c7b&#xff1f;&#xff08;\u6838\u5fc3\u539f\u56e0&#xff09;<\/h4>\n<p>\u5305\u88c5\u7c7b\u7684\u8bde\u751f&#xff0c;\u672c\u8d28\u662f\u4e3a\u4e86\u89e3\u51b3\u57fa\u672c\u6570\u636e\u7c7b\u578b\u65e0\u6cd5\u9002\u914d Java \u9762\u5411\u5bf9\u8c61\u4f53\u7cfb\u7684\u95ee\u9898&#xff0c;\u5177\u4f53\u4f53\u73b0\u5728\u4ee5\u4e0b 5 \u4e2a\u6838\u5fc3\u573a\u666f&#xff1a;<\/p>\n<h5>1. \u9002\u914d\u6cdb\u578b\u548c\u96c6\u5408\u6846\u67b6&#xff08;\u6700\u6838\u5fc3\u7528\u9014&#xff09;<\/h5>\n<p>Java \u7684\u6cdb\u578b&#xff08;Generic&#xff09;\u548c\u96c6\u5408\u6846\u67b6&#xff08;\u5982List\u3001Map\u3001Set&#xff09;\u53ea\u80fd\u5b58\u50a8\u5bf9\u8c61&#xff0c;\u65e0\u6cd5\u76f4\u63a5\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\u3002\u5305\u88c5\u7c7b\u662f\u8fde\u63a5\u57fa\u672c\u7c7b\u578b\u548c\u6cdb\u578b \/ \u96c6\u5408\u7684 \u201c\u6865\u6881\u201d\u3002<\/p>\n<p>\u53cd\u4f8b&#xff08;\u9519\u8bef&#xff09;&#xff1a;\u57fa\u672c\u7c7b\u578b\u65e0\u6cd5\u7528\u4e8e\u6cdb\u578b \/ \u96c6\u5408<\/p>\n<p>\/\/ \u7f16\u8bd1\u62a5\u9519&#xff1a;\u6cdb\u578b\u53c2\u6570\u4e0d\u80fd\u662f\u57fa\u672c\u7c7b\u578b<br \/>\nList&lt;int&gt; intList &#061; new ArrayList&lt;&gt;();<br \/>\n\/\/ \u7f16\u8bd1\u62a5\u9519&#xff1a;ArrayList\u53ea\u80fd\u5b58\u50a8\u5bf9\u8c61&#xff0c;\u4e0d\u80fd\u5b58\u50a8\u57fa\u672c\u7c7b\u578b<br \/>\nArrayList&lt;double&gt; doubleList &#061; new ArrayList&lt;&gt;();<\/p>\n<p>\u6b63\u4f8b&#xff08;\u6b63\u786e&#xff09;&#xff1a;\u5305\u88c5\u7c7b\u9002\u914d\u6cdb\u578b \/ \u96c6\u5408<\/p>\n<p>\/\/ \u6b63\u786e&#xff1a;\u4f7f\u7528Integer\u5305\u88c5\u7c7b\u5b58\u50a8\u6574\u6570<br \/>\nList&lt;Integer&gt; integerList &#061; new ArrayList&lt;&gt;();<br \/>\nintegerList.add(10); \/\/ \u81ea\u52a8\u88c5\u7bb1&#xff08;int\u2192Integer&#xff09;<br \/>\nintegerList.add(20);<\/p>\n<p>\/\/ \u6b63\u786e&#xff1a;\u4f7f\u7528Double\u5305\u88c5\u7c7b\u5b58\u50a8\u5c0f\u6570<br \/>\nMap&lt;String, Double&gt; scoreMap &#061; new HashMap&lt;&gt;();<br \/>\nscoreMap.put(&#034;\u6570\u5b66&#034;, 95.5);<br \/>\nscoreMap.put(&#034;\u82f1\u8bed&#034;, 88.0);<\/p>\n<h5>2. \u652f\u6301null\u503c&#xff08;\u4e1a\u52a1\u573a\u666f\u5fc5\u9700&#xff09;<\/h5>\n<p>\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e0d\u80fd\u8d4b\u503c\u4e3anull&#xff0c;\u4f46\u5b9e\u9645\u4e1a\u52a1\u4e2d&#xff0c;\u5f88\u591a\u573a\u666f\u9700\u8981\u7528null\u8868\u793a \u201c\u65e0\u503c\u201d&#xff08;\u6bd4\u5982\u6570\u636e\u5e93\u5b57\u6bb5\u5141\u8bb8\u4e3a\u7a7a\u3001\u63a5\u53e3\u8fd4\u56de\u7684\u53ef\u9009\u503c&#xff09;&#xff0c;\u5305\u88c5\u7c7b\u53ef\u4ee5\u5b8c\u7f8e\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<p>\u793a\u4f8b&#xff1a;\u4e1a\u52a1\u573a\u666f\u5bf9\u6bd4<\/p>\n<p>\/\/ \u57fa\u672c\u7c7b\u578b&#xff1a;\u65e0\u6cd5\u8868\u793a\u201c\u672a\u586b\u5199\u5e74\u9f84\u201d&#xff08;\u53ea\u80fd\u7528\u7279\u6b8a\u503c\u5982-1&#xff0c;\u6613\u51fa\u9519&#xff09;<br \/>\nint age1 &#061; -1; \/\/ \u7528-1\u8868\u793a\u201c\u672a\u586b\u5199\u201d&#xff0c;\u8bed\u4e49\u4e0d\u6e05\u6670<\/p>\n<p>\/\/ \u5305\u88c5\u7c7b&#xff1a;\u7528null\u76f4\u63a5\u8868\u793a\u201c\u672a\u586b\u5199\u5e74\u9f84\u201d&#xff0c;\u8bed\u4e49\u660e\u786e<br \/>\nInteger age2 &#061; null; \/\/ \u5b8c\u7f8e\u9002\u914d\u201c\u5b57\u6bb5\u4e3a\u7a7a\u201d\u7684\u4e1a\u52a1\u573a\u666f<\/p>\n<p>\/\/ \u6570\u636e\u5e93\u4ea4\u4e92\u573a\u666f&#xff1a;\u67e5\u8be2\u7528\u6237\u624b\u673a\u53f7&#xff0c;\u672a\u7ed1\u5b9a\u5219\u8fd4\u56denull<br \/>\nString sql &#061; &#034;select phone from user where id&#061;1&#034;;<br \/>\n\/\/ ResultSet\u7684getObject\u8fd4\u56deObject\u7c7b\u578b&#xff0c;\u5305\u88c5\u7c7b\u53ef\u63a5\u6536null&#xff0c;\u57fa\u672c\u7c7b\u578b\u4e0d\u884c<br \/>\nLong phone &#061; (Long) resultSet.getObject(&#034;phone&#034;); <\/p>\n<h5>3. \u63d0\u4f9b\u4e30\u5bcc\u7684\u5b9e\u7528\u65b9\u6cd5&#xff08;\u7b80\u5316\u5f00\u53d1&#xff09;<\/h5>\n<p>\u5305\u88c5\u7c7b\u5c01\u88c5\u4e86\u5927\u91cf\u9488\u5bf9\u6570\u503c \/ \u5b57\u7b26\u7684\u64cd\u4f5c\u65b9\u6cd5&#xff0c;\u57fa\u672c\u7c7b\u578b\u672c\u8eab\u6ca1\u6709\u4efb\u4f55\u65b9\u6cd5&#xff0c;\u53ea\u80fd\u4f9d\u8d56\u5de5\u5177\u7c7b&#xff08;\u5982Math&#xff09;&#xff0c;\u800c\u5305\u88c5\u7c7b\u7684\u65b9\u6cd5\u66f4\u8d34\u5408\u81ea\u8eab\u7c7b\u578b&#xff0c;\u4f7f\u7528\u66f4\u4fbf\u6377\u3002<\/p>\n<p>\u793a\u4f8b&#xff1a;\u5305\u88c5\u7c7b\u7684\u5b9e\u7528\u65b9\u6cd5<\/p>\n<p>\/\/ 1. \u5b57\u7b26\u4e32\u8f6c\u57fa\u672c\u7c7b\u578b&#xff08;\u5f00\u53d1\u4e2d\u9ad8\u9891\u4f7f\u7528&#xff09;<br \/>\nString numStr &#061; &#034;123&#034;;<br \/>\nint num1 &#061; Integer.parseInt(numStr); \/\/ Integer\u7684\u9759\u6001\u65b9\u6cd5&#xff0c;\u5feb\u901f\u8f6c\u6362<br \/>\ndouble num2 &#061; Double.valueOf(&#034;3.14&#034;); \/\/ Double\u7684\u9759\u6001\u65b9\u6cd5&#xff0c;\u8fd4\u56deDouble\u5bf9\u8c61<\/p>\n<p>\/\/ 2. \u8fdb\u5236\u8f6c\u6362<br \/>\nString binary &#061; Integer.toBinaryString(8); \/\/ 8\u8f6c\u4e8c\u8fdb\u5236&#xff1a;&#034;1000&#034;<br \/>\nString hex &#061; Integer.toHexString(16); \/\/ 16\u8f6c\u5341\u516d\u8fdb\u5236&#xff1a;&#034;10&#034;<\/p>\n<p>\/\/ 3. \u6570\u503c\u6bd4\u8f83&#xff08;\u907f\u514d\u7a7a\u6307\u9488\u7684\u5b89\u5168\u6bd4\u8f83&#xff09;<br \/>\nInteger a &#061; 100;<br \/>\nInteger b &#061; 200;<br \/>\nint compareResult &#061; a.compareTo(b); \/\/ \u6bd4\u8f83\u5927\u5c0f&#xff1a;\u8fd4\u56de-1&#xff08;a&lt;b&#xff09;\u30010&#xff08;\u76f8\u7b49&#xff09;\u30011&#xff08;a&gt;b&#xff09;<\/p>\n<p>\/\/ 4. \u5e38\u91cf\u503c\u83b7\u53d6<br \/>\nint maxInt &#061; Integer.MAX_VALUE; \/\/ \u83b7\u53d6int\u7684\u6700\u5927\u503c&#xff1a;2147483647<br \/>\ndouble minDouble &#061; Double.MIN_VALUE; \/\/ \u83b7\u53d6double\u7684\u6700\u5c0f\u503c<\/p>\n<h5>4. \u9002\u914d\u53cd\u5c04\u3001\u6ce8\u89e3\u7b49\u9ad8\u7ea7\u7279\u6027<\/h5>\n<p>Java \u7684\u53cd\u5c04\u3001\u6ce8\u89e3\u3001Lambda \u7b49\u9ad8\u7ea7\u7279\u6027\u5747\u57fa\u4e8e \u201c\u5bf9\u8c61\u201d \u8bbe\u8ba1&#xff0c;\u57fa\u672c\u7c7b\u578b\u65e0\u6cd5\u76f4\u63a5\u53c2\u4e0e&#xff0c;\u5305\u88c5\u7c7b\u662f\u552f\u4e00\u9009\u62e9\u3002<\/p>\n<p>\u793a\u4f8b&#xff1a;\u53cd\u5c04\u83b7\u53d6\u5b57\u6bb5\u7c7b\u578b<\/p>\n<p>class User {<br \/>\n    private Integer id; \/\/ \u5305\u88c5\u7c7b\u5b57\u6bb5<br \/>\n    private int age; \/\/ \u57fa\u672c\u7c7b\u578b\u5b57\u6bb5<br \/>\n}<\/p>\n<p>\/\/ \u53cd\u5c04\u83b7\u53d6User\u7c7b\u7684\u5b57\u6bb5<br \/>\nField[] fields &#061; User.class.getDeclaredFields();<br \/>\nfor (Field field : fields) {<br \/>\n    System.out.println(&#034;\u5b57\u6bb5\u540d&#xff1a;&#034; &#043; field.getName() &#043; &#034;&#xff0c;\u7c7b\u578b&#xff1a;&#034; &#043; field.getType());<br \/>\n    \/\/ \u8f93\u51fa&#xff1a;<br \/>\n    \/\/ \u5b57\u6bb5\u540d&#xff1a;id&#xff0c;\u7c7b\u578b&#xff1a;class java.lang.Integer<br \/>\n    \/\/ \u5b57\u6bb5\u540d&#xff1a;age&#xff0c;\u7c7b\u578b&#xff1a;int<br \/>\n}<br \/>\n\/\/ \u6ce8\u89e3\u53c2\u6570&#xff1a;\u53ea\u80fd\u7528\u5305\u88c5\u7c7b&#xff08;\u6216\u5b57\u7b26\u4e32\u3001Class\u7b49&#xff09;&#xff0c;\u4e0d\u80fd\u7528\u57fa\u672c\u7c7b\u578b<br \/>\n&#064;interface MyAnnotation {<br \/>\n    Integer value() default 0; \/\/ \u6b63\u786e<br \/>\n    \/\/ int value() default 0; \/\/ \u4e5f\u80fd\u7f16\u8bd1&#xff0c;\u4f46\u672c\u8d28\u662f\u81ea\u52a8\u88c5\u7bb1\u4e3aInteger<br \/>\n}<\/p>\n<h5>5. \u7edf\u4e00\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u6a21\u578b<\/h5>\n<p>Java \u662f\u7eaf\u9762\u5411\u5bf9\u8c61\u8bed\u8a00&#xff08;\u9664\u4e86\u57fa\u672c\u7c7b\u578b&#xff09;&#xff0c;\u5305\u88c5\u7c7b\u8ba9\u57fa\u672c\u7c7b\u578b \u201c\u5bf9\u8c61\u5316\u201d&#xff0c;\u53ef\u4ee5\u53c2\u4e0e\u7ee7\u627f\u3001\u591a\u6001\u7b49\u9762\u5411\u5bf9\u8c61\u7279\u6027&#xff0c;\u6bd4\u5982&#xff1a;<\/p>\n<ul>\n<li>\u5305\u88c5\u7c7b\u90fd\u7ee7\u627f\u81eaObject\u7c7b&#xff0c;\u53ef\u91cd\u5199equals()\u3001hashCode()\u3001toString()\u7b49\u65b9\u6cd5&#xff1b;<\/li>\n<li>\u5305\u88c5\u7c7b\u53ef\u4f5c\u4e3a\u65b9\u6cd5\u7684\u53c2\u6570 \/ \u8fd4\u56de\u503c&#xff0c;\u9002\u914d \u201c\u4e00\u5207\u7686\u5bf9\u8c61\u201d \u7684\u7f16\u7a0b\u601d\u7ef4\u3002<\/li>\n<\/ul>\n<h4>\u4e09\u3001\u81ea\u52a8\u88c5\u7bb1 \/ \u62c6\u7bb1&#xff1a;\u7b80\u5316\u5305\u88c5\u7c7b\u7684\u4f7f\u7528<\/h4>\n<p>Java 5 \u5f15\u5165\u4e86\u81ea\u52a8\u88c5\u7bb1&#xff08;Autoboxing&#xff09; \u548c\u81ea\u52a8\u62c6\u7bb1&#xff08;Unboxing&#xff09;&#xff0c;\u8ba9\u5305\u88c5\u7c7b\u548c\u57fa\u672c\u7c7b\u578b\u53ef\u4ee5\u65e0\u7f1d\u8f6c\u6362&#xff0c;\u5927\u5e45\u964d\u4f4e\u4f7f\u7528\u6210\u672c&#xff1a;<\/p>\n<ul>\n<li>\u81ea\u52a8\u88c5\u7bb1&#xff1a;\u57fa\u672c\u7c7b\u578b \u2192 \u5305\u88c5\u7c7b&#xff08;\u5982int 10 \u2192 Integer 10&#xff09;&#xff1b;<\/li>\n<li>\u81ea\u52a8\u62c6\u7bb1&#xff1a;\u5305\u88c5\u7c7b \u2192 \u57fa\u672c\u7c7b\u578b&#xff08;\u5982Integer 10 \u2192 int 10&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;\u81ea\u52a8\u88c5\u7bb1 \/ \u62c6\u7bb1<\/p>\n<p>\/\/ \u81ea\u52a8\u88c5\u7bb1&#xff1a;int \u2192 Integer<br \/>\nInteger num1 &#061; 100; \/\/ \u7b49\u4ef7\u4e8e Integer num1 &#061; Integer.valueOf(100);<\/p>\n<p>\/\/ \u81ea\u52a8\u62c6\u7bb1&#xff1a;Integer \u2192 int<br \/>\nint num2 &#061; num1; \/\/ \u7b49\u4ef7\u4e8e int num2 &#061; num1.intValue();<\/p>\n<p>\/\/ 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