{"id":5399,"date":"2024-02-24T10:39:47","date_gmt":"2024-02-24T02:39:47","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5399"},"modified":"2024-02-24T10:39:47","modified_gmt":"2024-02-24T02:39:47","slug":"java%e5%8f%8d%e5%b0%84%e6%9c%ba%e5%88%b6%ef%bc%9a%e4%bc%98%e5%8c%96%e4%b8%8e%e6%80%a7%e8%83%bd%e7%9a%84%e6%9d%83%e8%a1%a1","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5399","title":{"rendered":"Java\u53cd\u5c04\u673a\u5236\uff1a\u4f18\u5316\u4e0e\u6027\u80fd\u7684\u6743\u8861"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5728Java\u7f16\u7a0b\u4e2d\uff0c\u53cd\u5c04\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u5b83\u5141\u8bb8\u7a0b\u5e8f\u5728\u8fd0\u884c\u65f6\u68c0\u67e5\u7c7b\u3001\u63a5\u53e3\u3001\u5b57\u6bb5\u548c\u65b9\u6cd5\u7684\u4fe1\u606f\uff0c\u5e76\u52a8\u6001\u5730\u521b\u5efa\u548c\u8c03\u7528\u5bf9\u8c61\u3002\u7136\u800c\uff0c\u53cd\u5c04\u673a\u5236\u4e5f\u5e26\u6765\u4e86\u6027\u80fd\u4e0a\u7684\u5f00\u9500\uff0c\u56e0\u4e3a\u5b83\u6d89\u53ca\u5230\u989d\u5916\u7684\u8fd0\u884c\u65f6\u89e3\u6790\u548c\u7c7b\u578b\u68c0\u67e5\u3002\u4e3a\u4e86\u5e73\u8861\u53cd\u5c04\u7684\u7075\u6d3b\u6027\u548c\u6027\u80fd\uff0cJava\u5728\u4e0d\u540c\u7248\u672c\u4e2d\u8fdb\u884c\u4e86\u591a\u65b9\u9762\u7684\u4f18\u5316\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e00\u3001MethodHandle\u7684\u5f15\u5165<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java 7\u5f15\u5165\u4e86<code>MethodHandle<\/code>\uff0c\u8fd9\u662f\u4e00\u4e2a\u66f4\u4e3a\u4f4e\u7ea7\u4e14\u9ad8\u6548\u7684\u53cd\u5c04API\u3002<code>MethodHandle<\/code>\u76f4\u63a5\u5f15\u7528\u4e86\u76ee\u6807\u65b9\u6cd5\uff0c\u4ece\u800c\u907f\u514d\u4e86\u4f20\u7edf\u53cd\u5c04\u8c03\u7528\u4e2d\u7684\u95f4\u63a5\u6027\u548c\u90e8\u5206\u5b89\u5168\u68c0\u67e5\u3002\u901a\u8fc7\u4f7f\u7528<code>MethodHandle<\/code>\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u7f13\u5b58\u65b9\u6cd5\u8c03\u7528\uff0c\u51cf\u5c11\u4e86\u89e3\u6790\u548c\u67e5\u627e\u7684\u5f00\u9500\u3002<code>MethodHandle<\/code>\u8fd8\u652f\u6301\u591a\u79cd\u8c03\u7528\u6a21\u5f0f\uff0c\u5305\u62ec\u76f4\u63a5\u8c03\u7528\u3001\u95f4\u63a5\u8c03\u7528\u548c\u53ef\u53d8\u53c2\u6570\u8c03\u7528\uff0c\u8fd9\u8fdb\u4e00\u6b65\u63d0\u9ad8\u4e86\u53cd\u5c04\u8c03\u7528\u7684\u6548\u7387\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e8c\u3001\u7f13\u5b58\u53cd\u5c04\u5bf9\u8c61<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u4f20\u7edf\u7684<code>Constructor<\/code>\u548c<code>Method<\/code>\u53cd\u5c04\u7528\u6cd5\uff0cJava\u5f00\u53d1\u8005\u53ef\u4ee5\u901a\u8fc7\u7f13\u5b58\u53cd\u5c04\u5bf9\u8c61\u6765\u4f18\u5316\u6027\u80fd\u3002\u7531\u4e8e\u53cd\u5c04\u8c03\u7528\u6d89\u53ca\u5230\u89e3\u6790\u548c\u67e5\u627e\u7c7b\u7684\u6210\u5458\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u76f8\u5bf9\u8017\u65f6\u3002\u56e0\u6b64\uff0c\u5c06<code>Constructor<\/code>\u3001<code>Method<\/code>\u548c<code>Field<\/code>\u5bf9\u8c61\u7f13\u5b58\u8d77\u6765\uff0c\u5e76\u5728\u9700\u8981\u65f6\u91cd\u590d\u4f7f\u7528\uff0c\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u6267\u884c\u8fd9\u4e9b\u8017\u65f6\u7684\u64cd\u4f5c\u3002\u8fd9\u79cd\u4f18\u5316\u7b56\u7565\u5728\u9700\u8981\u9891\u7e41\u8fdb\u884c\u53cd\u5c04\u8c03\u7528\u7684\u573a\u666f\u4e2d\u5c24\u4e3a\u6709\u6548\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e09\u3001setAccessible()\u7684\u4f7f\u7528<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u867d\u7136\u4e0d\u63a8\u8350\u6ee5\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528<code>setAccessible(true)<\/code>\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u53cd\u5c04\u8c03\u7528\u7684\u6027\u80fd\u3002\u8fd9\u4e2a\u65b9\u6cd5\u5141\u8bb8\u53cd\u5c04\u8c03\u7528\u7ed5\u8fc7Java\u8bed\u8a00\u7684\u8bbf\u95ee\u63a7\u5236\u68c0\u67e5\uff0c\u4ece\u800c\u907f\u514d\u4e86\u8fd0\u884c\u65f6\u7684\u5b89\u5168\u68c0\u67e5\u5f00\u9500\u3002\u7136\u800c\uff0c\u4f7f\u7528<code>setAccessible()<\/code>\u9700\u8981\u8c28\u614e\uff0c\u56e0\u4e3a\u5b83\u53ef\u80fd\u7834\u574f\u5c01\u88c5\u6027\u5e76\u5bfc\u81f4\u5b89\u5168\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u56db\u3001JIT\u7f16\u8bd1\u5668\u7684\u4f18\u5316<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\u7684\u5373\u65f6\u7f16\u8bd1\u5668\uff08JIT\uff09\u5728\u8fd0\u884c\u65f6\u53ef\u4ee5\u5bf9\u4ee3\u7801\u8fdb\u884c\u4f18\u5316\uff0c\u5305\u62ec\u53cd\u5c04\u8c03\u7528\u3002\u5982\u679c\u53cd\u5c04\u8c03\u7528\u662f\u70ed\u70b9\u4ee3\u7801\u7684\u4e00\u90e8\u5206\uff0cJIT\u7f16\u8bd1\u5668\u53ef\u80fd\u4f1a\u5bf9\u5176\u8fdb\u884c\u5185\u8054\u3001\u7c7b\u578b\u7279\u5316\u7b49\u4f18\u5316\uff0c\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\u3002\u8fd9\u610f\u5473\u7740\u5728\u957f\u65f6\u95f4\u8fd0\u884c\u7684\u7a0b\u5e8f\u4e2d\uff0c\u53cd\u5c04\u8c03\u7528\u7684\u6027\u80fd\u53ef\u80fd\u4f1a\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u800c\u6539\u5584\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e94\u3001\u51cf\u5c11\u5f02\u5e38\u5904\u7406\u5f00\u9500<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53cd\u5c04\u8c03\u7528\u53ef\u80fd\u4f1a\u629b\u51fa\u591a\u79cd\u5f02\u5e38\uff0c\u8fd9\u4e9b\u5f02\u5e38\u7684\u5904\u7406\u4e5f\u4f1a\u5e26\u6765\u4e00\u5b9a\u7684\u6027\u80fd\u5f00\u9500\u3002\u4e3a\u4e86\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5f02\u5e38\u5904\u7406\u5f00\u9500\uff0c\u5f00\u53d1\u8005\u5e94\u8be5\u5728\u8c03\u7528\u53cd\u5c04\u4e4b\u524d\u8fdb\u884c\u5145\u5206\u7684\u68c0\u67e5\u548c\u9a8c\u8bc1\uff0c\u786e\u4fdd\u8c03\u7528\u7684\u5408\u6cd5\u6027\u548c\u6b63\u786e\u6027\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u603b\u7ed3<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\u53cd\u5c04\u673a\u5236\u5728\u63d0\u4f9b\u7075\u6d3b\u6027\u548c\u52a8\u6001\u6027\u7684\u540c\u65f6\uff0c\u4e5f\u5e26\u6765\u4e86\u6027\u80fd\u4e0a\u7684\u6311\u6218\u3002\u901a\u8fc7\u5f15\u5165<code>MethodHandle<\/code>\u3001\u7f13\u5b58\u53cd\u5c04\u5bf9\u8c61\u3001\u4f7f\u7528<code>setAccessible()<\/code>\u3001\u5229\u7528JIT\u7f16\u8bd1\u5668\u7684\u4f18\u5316\u4ee5\u53ca\u51cf\u5c11\u5f02\u5e38\u5904\u7406\u5f00\u9500\u7b49\u7b56\u7565\uff0cJava\u5728\u53cd\u5c04\u6027\u80fd\u4e0a\u8fdb\u884c\u4e86\u591a\u65b9\u9762\u7684\u4f18\u5316\u3002\u7136\u800c\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u65e0\u8bba\u5982\u4f55\u4f18\u5316\uff0c\u53cd\u5c04\u8c03\u7528\u901a\u5e38\u4ecd\u7136\u6bd4\u975e\u53cd\u5c04\u8c03\u7528\u6162\u3002\u56e0\u6b64\uff0c\u5728\u6027\u80fd\u654f\u611f\u7684\u5e94\u7528\u4e2d\uff0c\u5f00\u53d1\u8005\u5e94\u8be5\u8c28\u614e\u4f7f\u7528\u53cd\u5c04\uff0c\u5e76\u4ec5\u5728\u5fc5\u8981\u65f6\u4f7f\u7528\u5b83\u3002\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b\uff0c\u8003\u8651\u4f7f\u7528\u66f4\u9ad8\u6548\u7684\u53cd\u5c04\u66ff\u4ee3\u65b9\u6848\uff0c\u5982<code>MethodHandle<\/code>\uff0c\u4ee5\u5e73\u8861\u7075\u6d3b\u6027\u548c\u6027\u80fd\u7684\u9700\u6c42\u3002<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=5399\">Java\u53cd\u5c04\u673a\u5236\uff1a\u4f18\u5316\u4e0e\u6027\u80fd\u7684\u6743\u8861<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u7f16\u7a0b\u4e2d\uff0c\u53cd\u5c04\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u5b83\u5141\u8bb8\u7a0b\u5e8f\u5728\u8fd0\u884c\u65f6\u68c0\u67e5\u7c7b\u3001\u63a5\u53e3\u3001\u5b57\u6bb5\u548c\u65b9\u6cd5\u7684\u4fe1\u606f\uff0c\u5e76\u52a8\u6001\u5730\u521b\u5efa\u548c\u8c03\u7528\u5bf9 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[386,1496,1512,106,43],"class_list":["post-5399","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-jit","tag-1512","tag-106","tag-43"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5399","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5399"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5399\/revisions"}],"predecessor-version":[{"id":5400,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/5399\/revisions\/5400"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5399"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5399"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}