{"id":141,"date":"2024-12-04T10:49:06","date_gmt":"2024-12-04T10:49:06","guid":{"rendered":"https:\/\/www.isvmspace.com\/?p=141"},"modified":"2024-12-04T10:49:06","modified_gmt":"2024-12-04T10:49:06","slug":"jvm%e7%b3%bb%e5%88%97-%e7%b1%bb%e5%8a%a0%e8%bd%bd%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.isvmspace.com\/?p=141","title":{"rendered":"JVM\u7cfb\u5217-\u7c7b\u52a0\u8f7d\u673a\u5236"},"content":{"rendered":"<h1>\u7c7b\u7684\u751f\u547d\u5468\u671f<\/h1>\n<p><img decoding=\"async\" src=\"https:\/\/www.isvmspace.com\/wp-content\/uploads\/2023\/02\/\u7c7b\u7684\u751f\u547d\u5468\u671f.png\" alt=\"\u7c7b\u7684\u751f\u547d\u5468\u671f\" \/><\/p>\n<h2>\u7c7b\u52a0\u8f7d\u7684\u65f6\u673a<\/h2>\n<p>\u52a0\u8f7d\u3001\u9a8c\u8bc1\u3001\u51c6\u5907\u3001\u521d\u59cb\u5316\u548c\u5378\u8f7d\u8fd9\u4e94\u4e2a\u9636\u6bb5\u7684\u987a\u5e8f\u662f\u786e\u5b9a\u7684\uff0c\u4f46\u89e3\u6790\u9636\u6bb5\u5219\u4e0d\u4e00\u5b9a\uff0c\u5b83\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u4ee5\u5728\u521d\u59cb\u5316\u9636\u6bb5\u4e4b\u540e\u518d\u5f00\u59cb\u3002<br \/>\n\u865a\u62df\u673a\u89c4\u8303\u4e25\u683c\u89c4\u5b9a\u4e86\u6709\u4e14\u53ea\u6709\u4e94\u79cd\u60c5\u51b5\u5fc5\u987b\u7acb\u5373\u5bf9\u7c7b\u8fdb\u884c\u521d\u59cb\u5316\u201d\uff1a<br \/>\n+ \u4f7f\u7528new\u5173\u952e\u5b57\u5b9e\u4f8b\u5316\u5bf9\u8c61\u7684\u65f6\u5019\u3001\u8bfb\u53d6\u6216\u8bbe\u7f6e\u4e00\u4e2a\u7c7b\u7684\u9759\u6001\u5b57\u6bb5\u7684\u65f6\u5019\uff0c\u5df2\u7ecf\u8c03\u7528\u4e00\u4e2a\u7c7b\u7684\u9759\u6001\u65b9\u6cd5\u7684\u65f6\u5019\u3002<br \/>\n+ \u4f7f\u7528java.lang.reflect\u5305\u7684\u65b9\u6cd5\u5bf9\u7c7b\u8fdb\u884c\u53cd\u5c04\u8c03\u7528\u7684\u65f6\u5019\uff0c\u5982\u679c\u7c7b\u6ca1\u6709\u521d\u59cb\u5316\uff0c\u5219\u9700\u8981\u5148\u89e6\u53d1\u5176\u521d\u59cb\u5316\u3002<br \/>\n+ \u5f53\u521d\u59cb\u5316\u4e00\u4e2a\u7c7b\u7684\u65f6\u5019\uff0c\u5982\u679c\u53d1\u73b0\u5176\u7236\u7c7b\u6ca1\u6709\u88ab\u521d\u59cb\u5316\u5c31\u4f1a\u5148\u521d\u59cb\u5316\u5b83\u7684\u7236\u7c7b\u3002<br \/>\n+ \u5f53\u865a\u62df\u673a\u542f\u52a8\u7684\u65f6\u5019\uff0c\u7528\u6237\u9700\u8981\u6307\u5b9a\u4e00\u4e2a\u8981\u6267\u884c\u7684\u4e3b\u7c7b\uff08\u5c31\u662f\u5305\u542bmain()\u65b9\u6cd5\u7684\u90a3\u4e2a\u7c7b\uff09\uff0c\u865a\u62df\u673a\u4f1a\u5148\u521d\u59cb\u5316\u8fd9\u4e2a\u7c7b\uff1b<br \/>\n+ \u4f7f\u7528Jdk1.7\u52a8\u6001\u8bed\u8a00\u652f\u6301\u7684\u65f6\u5019\u7684\u4e00\u4e9b\u60c5\u51b5<\/p>\n<p>\u9664\u6b64\u4e4b\u5916\u6240\u6709\u5f15\u7528\u7c7b\u7684\u65b9\u5f0f\u90fd\u4e0d\u4f1a\u89e6\u53d1\u521d\u59cb\u5316\u79f0\u4e3a\u88ab\u52a8\u5f15\u7528\uff0c\u4e0b\u9762\u662f3\u4e2a\u88ab\u52a8\u5f15\u7528\u4f8b\u5b50\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7\u5b50\u7c7b\u5f15\u7528\u7236\u7c7b\u9759\u6001\u5b57\u6bb5\uff0c\u4e0d\u4f1a\u5bfc\u81f4\u5b50\u7c7b\u521d\u59cb\u5316<\/li>\n<li>\u901a\u8fc7\u6570\u7ec4\u5b9a\u4e49\u5f15\u7528\u7c7b\uff0c\u4e0d\u4f1a\u89e6\u53d1\u6b64\u7c7b\u7684\u521d\u59cb\u5316<\/li>\n<li>\u5e38\u91cf\u5728\u7f16\u8bd1\u9636\u6bb5\u4f1a\u5b58\u5165\u8c03\u7528\u7c7b\u7684\u5e38\u91cf\u6c60\u4e2d\uff0c\u672c\u8d28\u4e0a\u5e76\u6ca1\u6709\u76f4\u63a5\u5f15\u7528\u5b9a\u4e49\u5e38\u91cf\u7684\u7c7b\uff0c\u56e0\u6b64\u4e0d\u4f1a\u89e6\u53d1\u5b9a\u4e49\u5e38\u91cf\u7684\u7c7b\u7684\u521d\u59cb\u5316<\/li>\n<\/ul>\n<h2>\u52a0\u8f7d<\/h2>\n<p>\u52a0\u8f7d\u8fc7\u7a0b\uff1a<br \/>\n\u901a\u8fc7\u7c7b\u578b\u7684\u5b8c\u5168\u9650\u5b9a\u540d\uff0c\u4ea7\u751f\u4e00\u4e2a\u4ee3\u8868\u8be5\u7c7b\u578b\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u6d41\uff08\u6ca1\u6709\u6307\u660e\u4ece\u54ea\u91cc\u83b7\u53d6\u3001\u600e\u6837\u83b7\u53d6\uff0c\u662f\u4e00\u4e2a\u975e\u5e38\u5f00\u653e\u7684\u5e73\u53f0\uff09\uff0c\u52a0\u8f7d\u6e90\u5305\u62ec\uff1a\u6587\u4ef6\uff08Class\u6587\u4ef6\uff0cJar\u6587\u4ef6\uff09\u3001\u7f51\u7edc\u3001\u8ba1\u7b97\u751f\u6210\uff08\u4ee3\u7406$Proxy\uff09\u3001\u7531\u5176\u5b83\u6587\u4ef6\u751f\u6210\uff08jsp\uff09\u3001\u6570\u636e\u5e93\u4e2d\uff1b<br \/>\n\u89e3\u6790\u8fd9\u4e2a\u4e8c\u8fdb\u5236\u6570\u636e\u6d41\u4e3a\u65b9\u6cd5\u533a\u5185\u7684\u8fd0\u884c\u65f6\u6570\u636e\u7ed3\u6784\uff1b<br \/>\n\u521b\u5efa\u4e00\u4e2a\u8868\u793a\u8be5\u7c7b\u578b\u7684java.lang.Class\u7c7b\u7684\u5b9e\u4f8b\uff0c\u4f5c\u4e3a\u65b9\u6cd5\u533a\u8fd9\u4e2a\u7c7b\u7684\u5404\u79cd\u6570\u636e\u7684\u8bbf\u95ee\u5165\u53e3<\/p>\n<h2>\u8fde\u63a5-\u6821\u9a8c<\/h2>\n<p>\u9a8c\u8bc1\u662f\u8fde\u63a5\u9636\u6bb5\u7684\u7b2c\u4e00\u6b65\uff0c\u8fd9\u4e00\u9636\u6bb5\u7684\u76ee\u7684\u662f\u4e3a\u4e86\u786e\u4fddClass\u6587\u4ef6\u7684\u5b57\u8282\u6d41\u4e2d\u5305\u542b\u7684\u4fe1\u606f\u7b26\u5408\u5f53\u524d\u865a\u62df\u673a\u7684\u8981\u6c42\uff0c\u5e76\u4e14\u4e0d\u4f1a\u5371\u5bb3\u865a\u62df\u673a\u81ea\u8eab\u7684\u5b89\u5168\u3002\u4ece\u6574\u4f53\u4e0a\u770b\uff0c\u9a8c\u8bc1\u9636\u6bb5\u5927\u81f4\u4e0a\u4f1a\u5b8c\u62104\u4e2a\u9636\u6bb5\u7684\u6821\u9a8c\u5de5\u4f5c\uff1a\u6587\u4ef6\u683c\u5f0f\u3001\u5143\u6570\u636e\u3001\u5b57\u8282\u7801\u3001\u7b26\u53f7\u5f15\u7528\u3002<\/p>\n<ul>\n<li>\u6587\u4ef6\u683c\u5f0f\u9a8c\u8bc1\uff1a\u4e3b\u8981\u9a8c\u8bc1\u5b57\u8282\u6d41\u662f\u5426\u7b26\u5408Class\u6587\u4ef6\u683c\u5f0f\u89c4\u8303\uff0c\u5e76\u4e14\u80fd\u88ab\u5f53\u524d\u7684\u865a\u62df\u673a\u52a0\u8f7d\u5904\u7406\u3002\u4f8b\u5982\uff1a\u4e3b\uff0c\u6b21\u7248\u672c\u53f7\u662f\u5426\u5728\u5f53\u524d\u865a\u62df\u673a\u5904\u7406\u7684\u8303\u56f4\u4e4b\u5185\u3002\u5e38\u91cf\u6c60\u4e2d\u662f\u5426\u6709\u4e0d\u88ab\u652f\u6301\u7684\u5e38\u91cf\u7c7b\u578b\u3002\u6307\u5411\u5e38\u91cf\u7684\u4e2d\u7684\u7d22\u5f15\u503c\u662f\u5426\u5b58\u5728\u4e0d\u5b58\u5728\u7684\u5e38\u91cf\u6216\u4e0d\u7b26\u5408\u7c7b\u578b\u7684\u5e38\u91cf\u3002<\/li>\n<li>\u5143\u6570\u636e\u9a8c\u8bc1\uff1a\u5bf9\u5b57\u8282\u7801\u63cf\u8ff0\u7684\u4fe1\u606f\u8fdb\u884c\u8bed\u4e49\u7684\u5206\u6790\uff0c\u5206\u6790\u662f\u5426\u7b26\u5408java\u7684\u8bed\u8a00\u8bed\u6cd5\u7684\u89c4\u8303\u3002<\/li>\n<li>\u5b57\u8282\u7801\u9a8c\u8bc1\uff1a\u6700\u91cd\u8981\u7684\u9a8c\u8bc1\u73af\u8282\uff0c\u5206\u6790\u6570\u636e\u6d41\u548c\u63a7\u5236\uff0c\u786e\u5b9a\u8bed\u4e49\u662f\u5408\u6cd5\u7684\uff0c\u7b26\u5408\u903b\u8f91\u7684\u3002\u4e3b\u8981\u7684\u9488\u5bf9\u5143\u6570\u636e\u9a8c\u8bc1\u540e\u5bf9\u65b9\u6cd5\u4f53\u7684\u9a8c\u8bc1\u3002\u4fdd\u8bc1\u7c7b\u65b9\u6cd5\u5728\u8fd0\u884c\u65f6\u4e0d\u4f1a\u6709\u5371\u5bb3\u51fa\u73b0\u3002<\/li>\n<li>\u7b26\u53f7\u5f15\u7528\u9a8c\u8bc1\uff1a\u4e3b\u8981\u662f\u9488\u5bf9\u7b26\u53f7\u5f15\u7528\u8f6c\u6362\u4e3a\u76f4\u63a5\u5f15\u7528\u7684\u65f6\u5019\uff0c\u662f\u4f1a\u5ef6\u4f38\u5230\u7b2c\u4e09\u89e3\u6790\u9636\u6bb5\uff0c\u4e3b\u8981\u53bb\u786e\u5b9a\u8bbf\u95ee\u7c7b\u578b\u7b49\u6d89\u53ca\u5230\u5f15\u7528\u7684\u60c5\u51b5\uff0c\u4e3b\u8981\u662f\u8981\u4fdd\u8bc1\u5f15\u7528\u4e00\u5b9a\u4f1a\u88ab\u8bbf\u95ee\u5230\uff0c\u4e0d\u4f1a\u51fa\u73b0\u7c7b\u7b49\u65e0\u6cd5\u8bbf\u95ee\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<h2>\u8fde\u63a5-\u51c6\u5907<\/h2>\n<p>\u51c6\u5907\u9636\u6bb5\u6b63\u5f0f\u4e3a\u7c7b\u53d8\u91cf\u5206\u914d\u5185\u5b58\u5e76\u8bbe\u7f6e\u53d8\u91cf\u7684\u521d\u59cb\u503c\u3002\u8fd9\u4e9b\u53d8\u91cf\u4f7f\u7528\u7684\u5185\u5b58\u90fd\u5c06\u5728\u65b9\u6cd5\u533a\u4e2d\u8fdb\u884c\u5206\u914d\u3002\u6ce8\uff1a\u8fd9\u65f6\u5019\u8fdb\u884c\u5185\u5b58\u5206\u914d\u7684\u4ec5\u5305\u62ec\u7c7b\u53d8\u91cf\uff08\u88abstatic\u4fee\u9970\u7684\u53d8\u91cf\uff09\uff0c\u800c\u4e0d\u5305\u62ec\u5b9e\u4f8b\u53d8\u91cf\uff0c\u5b9e\u4f8b\u53d8\u91cf\u5c06\u4f1a\u5728\u5bf9\u8c61\u5b9e\u4f8b\u5316\u65f6\u968f\u7740\u5bf9\u8c61\u4e00\u8d77\u5206\u914d\u5728Java\u5806\u4e2d\u3002<br \/>\n\u521d\u59cb\u503c\u901a\u5e38\u662f\u6570\u636e\u7c7b\u578b\u7684\u96f6\u503c\uff1b\u5bf9\u4e8e\uff1apublic static int value = 123\uff0c\u90a3\u4e48\u53d8\u91cfvalue\u5728\u51c6\u5907\u9636\u6bb5\u8fc7\u540e\u7684\u521d\u59cb\u503c\u4e3a0\u800c\u4e0d\u662f123\uff0c\u8fd9\u65f6\u5019\u5c1a\u672a\u5f00\u59cb\u6267\u884c\u4efb\u4f55java\u65b9\u6cd5\uff0c\u628avalue\u8d4b\u503c\u4e3a123\u7684\u52a8\u4f5c\u5c06\u5728\u521d\u59cb\u5316\u9636\u6bb5\u624d\u4f1a\u88ab\u6267\u884c\u3002\u5bf9\u4e8e\uff1apublic static final int value = 123;\u7f16\u8bd1\u65f6Javac\u5c06\u4f1a\u4e3avalue\u751f\u6210ConstantValue\uff08\u5e38\u91cf\uff09\u5c5e\u6027\uff0c\u5728\u51c6\u5907\u9636\u6bb5\u865a\u62df\u673a\u5c31\u4f1a\u6839\u636eConstantValue\u7684\u8bbe\u7f6e\u5c06value\u8d4b\u503c\u4e3a123<\/p>\n<h2>\u8fde\u63a5-\u89e3\u6790<\/h2>\n<p>\u89e3\u6790\u9636\u6bb5\u662f\u865a\u62df\u673a\u5c06\u5e38\u91cf\u6c60\u4e2d\u7684\u7b26\u53f7\u5f15\u7528\u66ff\u6362\u4e3a\u76f4\u63a5\u5f15\u7528\u7684\u8fc7\u7a0b\u3002\u89e3\u6790\u52a8\u4f5c\u4e3b\u8981\u9488\u5bf9\u7c7b\u6216\u63a5\u53e3\u3001\u5b57\u6bb5\u3001\u7c7b\u65b9\u6cd5\u3001\u63a5\u53e3\u65b9\u6cd5\u3001\u65b9\u6cd5\u7c7b\u578b\u3001\u65b9\u6cd5\u53e5\u67c4\u548c\u8c03\u7528\u70b9\u9650\u5b9a\u7b267\u7c7b\u7b26\u53f7\u5f15\u7528\u8fdb\u884c\u3002<\/p>\n<ul>\n<li>\u7b26\u53f7\u5f15\u7528\uff08Symbolic References\uff09\uff1a \u7b26\u53f7\u5f15\u7528\u4ee5\u4e00\u7ec4\u7b26\u53f7\u6765\u63cf\u8ff0\u6240\u5f15\u7528\u7684\u76ee\u6807\uff0c\u7b26\u53f7\u53ef\u4ee5\u662f\u7b26\u5408\u7ea6\u5b9a\u7684\u4efb\u4f55\u5f62\u5f0f\u7684\u5b57\u9762\u91cf\uff0c\u7b26\u53f7\u5f15\u7528\u4e0e\u865a\u62df\u673a\u5b9e\u73b0\u7684\u5185\u5b58\u5e03\u5c40\u65e0\u5173\uff0c\u5f15\u7528\u7684\u76ee\u6807\u5e76\u4e0d\u4e00\u5b9a\u5df2\u7ecf\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n<\/li>\n<li>\n<p>\u76f4\u63a5\u5f15\u7528\uff08Direct References\uff09: \u76f4\u63a5\u5f15\u7528\u53ef\u4ee5\u662f\u76f4\u63a5\u6307\u5411\u76ee\u6807\u7684\u6307\u9488\u3001\u76f8\u5bf9\u504f\u79fb\u91cf\u6216\u662f\u4e00\u4e2a\u80fd\u95f4\u63a5\u5b9a\u4f4d\u5230\u76ee\u6807\u7684\u53e5\u67c4\u3002\u76f4\u63a5\u5f15\u7528\u4e0e\u865a\u62df\u673a\u5b9e\u73b0\u7684\u5185\u5b58\u5e03\u5c40\u76f8\u5173\uff0c\u5f15\u7528\u7684\u76ee\u6807\u5fc5\u5b9a\u5df2\u7ecf\u5728\u5185\u5b58\u4e2d\u5b58\u5728\u3002<\/p>\n<\/li>\n<\/ul>\n<h2>\u521d\u59cb\u5316<\/h2>\n<p>\u521d\u59cb\u5316\u9636\u6bb5\u662f\u6267\u884c\u7c7b\u6784\u9020\u5668<clinit>()\u65b9\u6cd5\u7684\u8fc7\u7a0b\uff0c\u5b83\u662f\u7531\u7f16\u8bd1\u5668\u81ea\u52a8\u6536\u96c6\u7c7b\u4e2d\u7684\u6240\u6709\u7c7b\u53d8\u91cf\u7684\u8d4b\u503c\u52a8\u4f5c\u548c\u9759\u6001\u8bed\u53e5\u5757static{}\u4e2d\u7684\u8bed\u53e5\u5408\u5e76\u4ea7\u751f\u7684\u3002\u9759\u6001\u8bed\u53e5\u5757\u4e2d\u53ea\u80fd\u8bbf\u95ee\u5230\u5b9a\u4e49\u5728\u9759\u6001\u8bed\u53e5\u5757\u4e4b\u524d\u7684\u53d8\u91cf\uff0c\u5b9a\u4e49\u5728\u5b83\u4e4b\u540e\u7684\u53d8\u91cf\uff0c\u5728\u524d\u9762\u7684\u9759\u6001\u8bed\u53e5\u5757\u53ef\u4ee5\u8d4b\u503c\uff0c\u4f46\u4e0d\u80fd\u8bbf\u95ee\u3002<br 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