{"id":857,"date":"2026-03-03T21:27:05","date_gmt":"2026-03-03T13:27:05","guid":{"rendered":"http:\/\/47.100.165.17\/wordpress\/?p=857"},"modified":"2026-03-03T21:27:06","modified_gmt":"2026-03-03T13:27:06","slug":"%e3%80%90java%e3%80%91%e5%9f%ba%e6%9c%ac%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e7%bc%93%e5%ad%98%e6%b1%a0%ef%bc%9a%e6%ba%90%e7%a0%81%e8%a7%a3%e6%9e%90%e4%b8%8e%e5%ae%9e%e6%88%98%e9%81%bf%e5%9d%91","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=857","title":{"rendered":"\u3010Java\u3011\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7f13\u5b58\u6c60\uff1a\u6e90\u7801\u89e3\u6790\u4e0e\u5b9e\u6218\u907f\u5751"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4e0a\u4e00\u7bc7\u6587\u7ae0\u548c\u5927\u5bb6\u5206\u4eab\u4e86 Java \u5165\u95e8\u7684\u6838\u5fc3\u6982\u5ff5\uff0c\u4eca\u5929\u54b1\u4eec\u6df1\u5165\u63a2\u8ba8\u4e00\u4e2a\u5bb9\u6613\u88ab\u5ffd\u7565\u4f46\u5f71\u54cd\u6df1\u8fdc\u7684\u77e5\u8bc6\u70b9 \u2014\u2014 \u57fa\u672c\u6570\u636e\u7c7b\u578b\u7f13\u5b58\u6c60\u3002\u76f8\u4fe1\u5f88\u591a\u540c\u5b66\u5728\u5f00\u53d1\u4e2d\u90fd\u9047\u5230\u8fc7 Integer \u5bf9\u8c61\u6bd4\u8f83\u7684\u8be1\u5f02\u95ee\u9898\uff0c\u6bd4\u5982<code>new Integer(127) == Integer.valueOf(127)<\/code>\u8fd4\u56de false\uff0c\u800c<code>Integer.valueOf(127) == Integer.valueOf(127)<\/code>\u5374\u8fd4\u56de true\u3002\u8fd9\u80cc\u540e\u7684\u7384\u673a\uff0c\u6b63\u662f\u7f13\u5b58\u6c60\u5728\u8d77\u4f5c\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u6838\u5fc3\u533a\u522b\uff1anew Integer () vs Integer.valueOf ()<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u4ece\u6700\u57fa\u7840\u7684\u95ee\u9898\u5165\u624b\uff0c\u8fd9\u4e24\u4e2a\u521b\u5efa Integer \u5bf9\u8c61\u7684\u65b9\u5f0f\u5230\u5e95\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>new Integer(18)<\/code>\uff1a\u6bcf\u6b21\u8c03\u7528\u90fd\u4f1a\u5728\u5806\u5185\u5b58\u4e2d\u65b0\u5efa\u4e00\u4e2a\u72ec\u7acb\u5bf9\u8c61\uff0c\u65e0\u8bba\u6570\u503c\u662f\u5426\u76f8\u540c\uff0c\u59cb\u7ec8\u662f\u4e0d\u540c\u7684\u5f15\u7528\uff1b<\/li>\n\n\n\n<li><code>Integer.valueOf(18)<\/code>\uff1a\u4f18\u5148\u4ece\u7f13\u5b58\u6c60\u4e2d\u83b7\u53d6\u5bf9\u8c61\uff0c\u82e5\u6570\u503c\u5728\u7f13\u5b58\u8303\u56f4\u5185\u5219\u76f4\u63a5\u8fd4\u56de\u7f13\u5b58\u5f15\u7528\uff0c\u8d85\u51fa\u8303\u56f4\u624d\u4f1a\u65b0\u5efa\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3e\u4e2a\u76f4\u89c2\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Integer a = new Integer(127);\nInteger b = new Integer(127);\nInteger c = Integer.valueOf(127);\nInteger d = Integer.valueOf(127);\n\nSystem.out.println(a == b); \/\/ false\uff08\u4e24\u4e2a\u4e0d\u540c\u5bf9\u8c61\uff09\nSystem.out.println(c == d); \/\/ true\uff08\u540c\u4e00\u7f13\u5b58\u5bf9\u8c61\uff09\nSystem.out.println(a == c); \/\/ false\uff08\u65b0\u5bf9\u8c61 vs \u7f13\u5b58\u5bf9\u8c61\uff09\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u5dee\u5f02\u7684\u672c\u8d28\u7684\u662f\uff1a\u7f13\u5b58\u6c60\u901a\u8fc7\u590d\u7528\u5e38\u7528\u5bf9\u8c61\uff0c\u907f\u514d\u4e86\u9891\u7e41\u521b\u5efa\u9500\u6bc1\u7684\u5f00\u9500\uff0c\u8fd9\u4e5f\u662f Java \u6027\u80fd\u4f18\u5316\u7684\u7ecf\u5178\u601d\u8def\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u54ea\u4e9b\u5305\u88c5\u7c7b\u6709\u7f13\u5b58\u6c60\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u6709\u4e2a\u5173\u952e\u7ed3\u8bba\uff1a<strong>\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u5305\u88c5\u7c7b\u4e2d\uff0c\u9664\u4e86 Float \u548c Double\uff0c\u5176\u4f59\u516d\u4e2a\uff08Byte\u3001Short\u3001Integer\u3001Long\u3001Character\u3001Boolean\uff09\u90fd\u5185\u7f6e\u4e86\u5e38\u91cf\u7f13\u5b58\u6c60<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5404\u81ea\u7684\u7f13\u5b58\u8303\u56f4\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Byte\uff1a-128~127\uff08\u8986\u76d6\u6240\u6709 byte \u53d6\u503c\u8303\u56f4\uff09<\/li>\n\n\n\n<li>Short\uff1a-128~127<\/li>\n\n\n\n<li>Long\uff1a-128~127<\/li>\n\n\n\n<li>Character\uff1a\\u0000\uff080\uff09~ \\u007F\uff08127\uff09<\/li>\n\n\n\n<li>Boolean\uff1a\u4ec5\u7f13\u5b58 true \u548c false \u4e24\u4e2a\u5e38\u91cf<\/li>\n\n\n\n<li>Integer\uff1a\u9ed8\u8ba4 &#8211; 128~127\uff08\u53ef\u901a\u8fc7 JVM \u53c2\u6570\u8c03\u6574\u4e0a\u9650\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4ec0\u4e48 Float \u548c Double \u6ca1\u6709\u7f13\u5b58\u6c60\uff1f\u5176\u5b9e\u5f88\u597d\u7406\u89e3 \u2014\u2014 \u6d6e\u70b9\u578b\u7684\u53d6\u503c\u8303\u56f4\u6781\u5e7f\uff0c\u4e14\u5728\u5e38\u7528\u533a\u95f4\u5185\u6570\u503c\u662f\u8fde\u7eed\u7684\uff0c\u7f13\u5b58\u7684\u6027\u4ef7\u6bd4\u6781\u4f4e\uff0c\u53cd\u800c\u4f1a\u5360\u7528\u5927\u91cf\u5185\u5b58\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001IntegerCache \u6e90\u7801\u6df1\u5ea6\u89e3\u6790<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Integer \u7684\u7f13\u5b58\u673a\u5236\u6838\u5fc3\u5728\u4e8e<code>IntegerCache<\/code>\u8fd9\u4e2a\u9759\u6001\u5185\u90e8\u7c7b\uff0c\u54b1\u4eec\u6765\u770b\u5173\u952e\u6e90\u7801\u903b\u8f91\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>private static class IntegerCache {\n    static final int low = -128;\n    static final int high;\n    static final Integer cache&#91;];\n\n    static {\n        \/\/ \u7f13\u5b58\u6c60\u4e0a\u9650\u9ed8\u8ba4127\uff0c\u53ef\u901a\u8fc7JVM\u53c2\u6570\u8c03\u6574\n        int h = 127;\n        String integerCacheHighPropValue =\n            sun.misc.VM.getSavedProperty(\"java.lang.Integer.IntegerCache.high\");\n        if (integerCacheHighPropValue != null) {\n            try {\n                int i = parseInt(integerCacheHighPropValue);\n                i = Math.max(i, 127);\n                \/\/ \u4e0a\u9650\u4e0d\u80fd\u8d85\u8fc7Integer.MAX_VALUE - 129\n                h = Math.min(i, Integer.MAX_VALUE - 129);\n            } catch (NumberFormatException nfe) {\n                \/\/ \u5ffd\u7565\u65e0\u6548\u53c2\u6570\n            }\n        }\n        high = h;\n        \/\/ \u521d\u59cb\u5316\u7f13\u5b58\u6570\u7ec4\n        cache = new Integer&#91;(high - low) + 1];\n        int j = low;\n        for (int k = 0; k &lt; cache.length; k++)\n            cache&#91;k] = new Integer(j++);\n\n        \/\/ \u65ad\u8a00\u7f13\u5b58\u4e0a\u9650\u81f3\u5c11\u4e3a127\n        assert high &gt;= 127;\n    }\n\n    private IntegerCache() {}\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u6e90\u7801\u80fd\u770b\u51fa\u4e09\u4e2a\u5173\u952e\u4fe1\u606f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9759\u6001\u4ee3\u7801\u5757\u4f18\u5148\u6267\u884c\uff1a\u7c7b\u52a0\u8f7d\u65f6\u5c31\u521d\u59cb\u5316\u7f13\u5b58\u6570\u7ec4\uff0c\u63d0\u524d\u521b\u5efa &#8211; 128~high \u8303\u56f4\u5185\u7684 Integer \u5bf9\u8c61\uff1b<\/li>\n\n\n\n<li>\u7f13\u5b58\u4e0a\u9650\u53ef\u914d\u7f6e\uff1a\u901a\u8fc7<code>-XX:AutoBoxCacheMax=NNN<\/code>\u53c2\u6570\u8c03\u6574 high \u503c\uff0c\u6bd4\u5982<code>-XX:AutoBoxCacheMax=500<\/code>\u4f1a\u628a\u7f13\u5b58\u8303\u56f4\u6269\u5927\u5230 &#8211; 128~500\uff1b<\/li>\n\n\n\n<li>\u65ad\u8a00\u7684\u4f5c\u7528\uff1a<code>assert high >= 127<\/code>\u662f\u7528\u6765\u9a8c\u8bc1\u7f13\u5b58\u4e0a\u9650\u662f\u5426\u7b26\u5408\u9884\u671f\uff0c\u9ed8\u8ba4\u5173\u95ed\uff0c\u9700\u901a\u8fc7<code>-ea<\/code>\u53c2\u6570\u5f00\u542f\u65ad\u8a00\u529f\u80fd\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u65ad\u8a00\u7684\u4f7f\u7528\u4e0e JVM \u53c2\u6570\u914d\u7f6e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u63d0\u5230\u65ad\u8a00\uff0c\u5f88\u591a\u540c\u5b66\u53ef\u80fd\u5e73\u65f6\u7528\u5f97\u5c11\u3002\u8fd9\u91cc\u8865\u5145\u4e24\u4e2a\u5b9e\u7528\u77e5\u8bc6\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f00\u542f\u65ad\u8a00\uff1a\u8fd0\u884c Java \u7a0b\u5e8f\u65f6\u6dfb\u52a0<code>-ea<\/code>\u53c2\u6570\uff08\u6bd4\u5982 IDEA \u4e2d\u6267\u884c\u547d\u4ee4\uff1a<code>\/usr\/libexec\/java_home -v 1.8 \u2013exec java -ea com.yunyang.s51.AssertTest<\/code>\uff09\uff1b<\/li>\n\n\n\n<li>\u65ad\u8a00\u4f5c\u7528\uff1a\u4ec5\u7528\u4e8e\u5f00\u53d1\u6d4b\u8bd5\u9636\u6bb5\u7684\u903b\u8f91\u9a8c\u8bc1\uff0c\u751f\u4ea7\u73af\u5883\u5efa\u8bae\u5173\u95ed\uff0c\u907f\u514d\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u800c\u8c03\u6574\u7f13\u5b58\u6c60\u5927\u5c0f\u7684 JVM \u53c2\u6570\uff0c\u9002\u5408\u5728\u9700\u8981\u9891\u7e41\u4f7f\u7528\u5927\u8303\u56f4 Integer \u5bf9\u8c61\u7684\u573a\u666f\uff08\u6bd4\u5982\u5927\u6570\u636e\u5904\u7406\uff09\uff0c\u5408\u7406\u6269\u5927\u7f13\u5b58\u8303\u56f4\u80fd\u51cf\u5c11\u5bf9\u8c61\u521b\u5efa\u5f00\u9500\uff0c\u4f46\u4e5f\u8981\u6ce8\u610f\u907f\u514d\u5185\u5b58\u6d6a\u8d39\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u7f13\u5b58\u6c60\u7684\u4f18\u52bf\u4e0e\u6f5c\u5728\u98ce\u9669<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f18\u52bf\u5f88\u76f4\u63a5\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63d0\u5347\u6027\u80fd\uff1a\u590d\u7528\u5bf9\u8c61\u51cf\u5c11\u4e86\u521b\u5efa\u548c\u5783\u573e\u56de\u6536\u7684\u8017\u65f6\uff1b<\/li>\n\n\n\n<li>\u8282\u7701\u5185\u5b58\uff1a\u907f\u514d\u5927\u91cf\u91cd\u590d\u5bf9\u8c61\u5360\u7528\u5806\u7a7a\u95f4\uff0c\u5c24\u5176\u5728\u5faa\u73af\u521b\u5efa\u76f8\u540c\u6570\u503c\u5bf9\u8c61\u65f6\u6548\u679c\u663e\u8457\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u6f5c\u5728\u98ce\u9669\u9700\u8b66\u60d5\uff1a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f13\u5b58\u6c60\u4e2d\u7684\u5bf9\u8c61\u662f\u5171\u4eab\u7684\uff0c\u82e5\u88ab\u591a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539\uff08\u867d\u7136 Integer \u662f\u4e0d\u53ef\u53d8\u7c7b\uff0c\u4f46\u5b9e\u9645\u5f00\u53d1\u4e2d\u53ef\u80fd\u5b58\u5728\u7c7b\u4f3c\u573a\u666f\uff09\uff0c\u4f1a\u5bfc\u81f4\u6570\u636e\u4e00\u81f4\u6027\u95ee\u9898\u3002\u4e0d\u8fc7 Integer \u7684\u4e0d\u53ef\u53d8\u6027\u672c\u8eab\u907f\u514d\u4e86\u8fd9\u4e2a\u95ee\u9898\uff0c\u8fd9\u91cc\u4e3b\u8981\u662f\u63d0\u9192\u5927\u5bb6\u5728\u81ea\u5b9a\u4e49\u7f13\u5b58\u6c60\u65f6\u8981\u6ce8\u610f\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u5f00\u53d1\u5b9e\u6218\u5efa\u8bae<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4f18\u5148\u4f7f\u7528<code>valueOf()<\/code>\u65b9\u6cd5\uff1a\u83b7\u53d6\u5305\u88c5\u7c7b\u5bf9\u8c61\u65f6\uff0c\u5c3d\u91cf\u7528<code>valueOf()<\/code>\u800c\u975e<code>new<\/code>\uff0c\u5145\u5206\u5229\u7528\u7f13\u5b58\u6c60\uff1b<\/li>\n\n\n\n<li>\u907f\u514d\u7528<code>==<\/code>\u6bd4\u8f83\u5305\u88c5\u7c7b\uff1a\u5373\u4f7f\u7f13\u5b58\u6c60\u751f\u6548\uff0c\u4e5f\u5efa\u8bae\u7528<code>equals()<\/code>\u6bd4\u8f83\u503c\uff0c\u907f\u514d\u56e0\u8303\u56f4\u8d85\u51fa\u7f13\u5b58\u5bfc\u81f4\u7684\u903b\u8f91\u9519\u8bef\uff1b<\/li>\n\n\n\n<li>\u5408\u7406\u914d\u7f6e JVM \u53c2\u6570\uff1a\u6839\u636e\u4e1a\u52a1\u573a\u666f\u8c03\u6574<code>AutoBoxCacheMax<\/code>\uff0c\u5e73\u8861\u6027\u80fd\u548c\u5185\u5b58\u5f00\u9500\uff1b<\/li>\n\n\n\n<li>\u8bb0\u4f4f\u7f13\u5b58\u8303\u56f4\uff1a\u5c24\u5176\u8981\u6ce8\u610f Short\u3001Integer\u3001Long \u7684\u9ed8\u8ba4\u7f13\u5b58\u8303\u56f4\u90fd\u662f &#8211; 128~127\uff0c\u907f\u514d\u8e29\u5751\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7f13\u5b58\u6c60\u662f Java \u7684\u4e00\u4e2a\u6027\u80fd\u4f18\u5316\u8bbe\u8ba1\uff0c\u7406\u89e3\u5176\u539f\u7406\u4e0d\u4ec5\u80fd\u89e3\u51b3\u5b9e\u9645\u5f00\u53d1\u4e2d\u7684\u8be1\u5f02\u95ee\u9898\uff0c\u66f4\u80fd\u5e2e\u52a9\u6211\u4eec\u6df1\u5165\u638c\u63e1 Java \u7684\u7c7b\u52a0\u8f7d\u673a\u5236\u548c\u6027\u80fd\u4f18\u5316\u601d\u8def\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u8ba9\u5927\u5bb6\u5bf9\u7f13\u5b58\u6c60\u6709\u6e05\u6670\u7684\u8ba4\u77e5\uff0c\u4e0b\u4e00\u7bc7\u6211\u4eec\u5c06\u63a2\u8ba8\u66f4\u591a Java \u6838\u5fc3\u6280\u672f\u70b9\uff0c\u8bb0\u5f97\u6301\u7eed\u5173\u6ce8\u54e6\uff5e<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5927\u5bb6\u5728\u4f7f\u7528\u7f13\u5b58\u6c60\u65f6\u9047\u5230\u8fc7\u7279\u6b8a\u573a\u666f\uff0c\u6216\u8005\u6709\u5176\u4ed6\u7591\u95ee\uff0c\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u4ea4\u6d41\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4e0a\u4e00\u7bc7\u6587\u7ae0\u548c\u5927\u5bb6\u5206\u4eab\u4e86 Java \u5165\u95e8\u7684\u6838\u5fc3\u6982\u5ff5\uff0c\u4eca\u5929\u54b1\u4eec\u6df1\u5165\u63a2\u8ba8\u4e00\u4e2a\u5bb9\u6613\u88ab\u5ffd\u7565\u4f46\u5f71\u54cd\u6df1\u8fdc<\/p>\n<div 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