{"id":2051,"date":"2016-05-25T21:42:16","date_gmt":"2016-05-25T13:42:16","guid":{"rendered":"http:\/\/boweihe.me\/?p=2051"},"modified":"2016-05-25T21:42:16","modified_gmt":"2016-05-25T13:42:16","slug":"%e5%be%85%e5%a1%ab%e4%b9%8b%e5%9d%91%ef%bc%9ajava%e7%b1%bb%e5%8a%a0%e8%bd%bd%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/dayandcarrot.space\/?p=2051","title":{"rendered":"Java\u5305\u3001\u7c7b\u7684\u52a0\u8f7d\u673a\u5236\uff08\u7406\u8bba\uff09"},"content":{"rendered":"<blockquote><p><span style=\"color: #ff0000;\">\u672c\u4ebaJava\u83dc\u9e21\u4e00\u679a\uff0c\u5982\u679c\u4e0b\u9762\u7684\u5185\u5bb9\u6709\u8bef\uff0c\u8bf7\u5404\u4f4d\u62fc\u547d\u7559\u8a00\uff0c\u6211\u79d2\u79d2\u949f\u6539\uff01<\/span><\/p><\/blockquote>\n<p>\u505a\u9879\u76ee\u7684\u540c\u65f6\u52aa\u529b\u8865\u5168\u77e5\u8bc6\u70b9\u6216\u8bb8\u662f\u5f53\u52a1\u4e4b\u6025\uff1f<\/p>\n<h1>\u95ee\u9898<\/h1>\n<p>\u6b64\u9762\u8bd5\u95ee\u9898\u66b4\u9732\u4e86\u6211\u5bf9Java\u5185\u90e8\u539f\u7406\u7684\u65e0\u77e5\uff0c\u54c8\u54c8\uff0c\u8d76\u7d27\u5b66\u3002<em>\u9898\u5916\u8bdd\uff1a\u6362\u505a\u9762C++\u7684\u8bdd\uff0c\u6211\u4f30\u8ba1\u9762\u8bd5\u5b98\u4f1a\u7528\u4e00\u4e2a\u591a\u7ee7\u627f\u91cc\u5934\u7684\u95ee\u9898\u6765\u8003\u3002<\/em><\/p>\n<blockquote><p>\u6709a.jar\u548cb.jar\uff0c\u91cc\u9762\u90fd\u6709\u67d0\u4e2a\u7c7bMyClass\u4e14\u4ed6\u4eec\u7684<strong>\u5305\u540d\u5b8c\u5168\u76f8\u540c<\/strong>\uff0c\u4f46\u662f\u6709\u4e0d\u540c\u7684foo()\u65b9\u6cd5\uff0c\u5728\u4e00\u4e2a\u9879\u76ee\u4e2d\u540c\u65f6\u5f15\u5165\u8fd9\u4e24\u4e2ajar\u4f1a\u51fa\u73b0\u4ec0\u4e48\u5947\u5999\u7684\u4e8b\u60c5\u5462\uff1f<\/p><\/blockquote>\n<p>\u8fd9\u4e2a\u95ee\u9898\u7684\u7b54\u6848\u662f\uff0c\u8981\u6839\u636e\u7c7b\u52a0\u8f7d\u5668\u7684\u52a0\u8f7d\u987a\u5e8f\u6765\u51b3\u5b9a\u6211\u4eec\u6784\u5efaMyClass\u5bf9\u8c61\u7684\u65f6\u5019\u7a76\u7adf\u4f1a\u5148\u627e\u5230\u54ea\u4e2ajar\u91cc\u5934\u7684\u6587\u4ef6\uff0ca.jar\/b.jar\u54ea\u4e2a\u8fd0\u6c14\u597d\u62d4\u5f97\u5934\u7b79\u4e86\uff0c\u5269\u4e0b\u7684\u5c31\u88ab\u5ffd\u89c6\u4e86\u3002<br \/>\n\u5982\u679c\u6211\u4eec\u6784\u5efa\u4e86\u4e0d\u540c\u7684\u7c7b\u52a0\u8f7d\u5668\u5bf9\u8c61\u7684\u8bdd\uff0c\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668\u6765\u540c\u65f6\u52a0\u8f7d\u8fd9\u4e24\u4e2a\u957f\u5f97\u770b\u8d77\u6765\u4e00\u6a21\u4e00\u6837\u7684\u7c7b\uff0c\u5e76\u4e14\u53ef\u4ee5\u5404\u81ea\u8c03\u7528\u5176\u65b9\u6cd5\u5c5e\u6027\u4ec0\u4e48\u7684\u3002<br \/>\n\u66f4\u8be6\u5c3d\u7684\u56de\u7b54\u53ef\u4ee5\u770b\u8fd9\u91cc\uff1a<a href=\"http:\/\/stackoverflow.com\/questions\/6879652\/possible-to-use-two-java-classes-with-same-name-and-same-package\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/stackoverflow.com\/questions\/6879652\/possible-to-use-two-java-classes-with-same-name-and-same-package<\/a><\/p>\n<h1><\/h1>\n<h1>\u5305(Package)\u3001\u7f16\u8bd1\u5355\u5143<\/h1>\n<p>C\/C++\u91cc\u9762\u7528<span class=\"lang:c++ decode:true crayon-inline\">#include<\/span>\u6765\u8868\u793a\u5f15\u7528\u7684\u7c7b\uff08\u6587\u4ef6\uff09\uff0c\u5e76\u4e14\u7528\u8fc7C++\u7684\u76c6\u53cb\u80af\u5b9a\u77e5\u9053<span class=\"lang:c++ decode:true crayon-inline \">namespace<\/span>\u00a0\u8fd9\u4e2a\u5173\u952e\u5b57\u53ef\u4ee5\u7528\u6765\u9694\u79bb\u540d\u5b57\u76f8\u540c\u4e1c\u897f\uff0c\u6700\u5e38\u89c1\u7684\u83ab\u8fc7\u4e8e<span class=\"lang:default decode:true crayon-inline\">using namespace std;<\/span>\u00a0\u4e86\u3002\u4ee5\u4e0a\u8fd9\u4e9b\u4e0e\u6240\u8c13\u201c\u8bbf\u95ee\u6743\u9650\u63a7\u5236\u201d\u6709\u5173\uff08\u8be6\u89c1\u300aJava\u7f16\u7a0b\u601d\u60f3\u300b\u7b2c6\u7ae0\uff09\u3002<br \/>\n\u800cJava\u4ee5\u53ca\u8bf8\u5982Python\u8fd9\u79cd\u8bed\u8a00\u91c7\u7528\u5305(package)\u4f5c\u4e3a\u5e93\u5355\u5143\uff0c\u4e00\u4e2a\u5305\u5185\u5305\u542b\u4e00\u7ec4\u7c7b\uff0c\u6bd4\u5982ArrayList\u5728Java\u6807\u51c6\u5e93\u4e2d\u88ab\u653e\u7f6e\u5728java.util\u5305(\u540d\u5b57\u7a7a\u95f4)\u4e0b\u3002\u5305\u7684\u4f5c\u7528\u6709\u70b9\u50cf\u5730\u5740\uff0c\u5728\u5bfb\u627e\u4e00\u4e2a\u7c7b\u7684\u65f6\u5019\u5c31\u50cf\u5feb\u9012\u5206\u62e3\u4e00\u6837\uff0c\u6839\u636e\u5305\u7684\u540d\u5b57\u80fd\u627e\u5230\u6700\u7ec8\u7684\u76ee\u6807\uff0c\u4e00\u4e2a\u4e0d\u6070\u5f53\u7684\u4f8b\u5b50\u5c31\u662f\uff0c<em>package \u6d59\u6c5f.\u676d\u5dde.\u897f\u6e56<\/em>\u00a0\u5e95\u4e0b\u53ef\u80fd\u4f1a\u6709 <em>\u540c\u4ec1\u533b\u9662<\/em> \u8fd9\u4e2a\u7c7b\uff0c\u800c <em>package \u798f\u5efa.\u798f\u5dde.\u9f13\u697c<\/em>\uff08\u8fd9\u4e2a\u4f8b\u5b50\u4e0d\u6070\u5f53\uff0c\u56e0\u4e3a\u6309\u7167Java\u7684\u539f\u610f\uff0c\u5305\u540d\u5e94\u8be5\u662f\u201c\u4ece\u540e\u5f80\u524d\u201d\u5199\u7684\uff0c\u5982cn.com.ibm\uff09 \u5e95\u4e0b\u4e5f\u53ef\u4ee5\u6709 <em>\u540c\u4ec1\u533b\u9662<\/em> \u8fd9\u4e2a\u7c7b\uff0c\u5728Java\u4ee3\u7801\u4e2d\u4f7f\u7528\u7c7b\u7684\u5185\u5bb9\u7684\u65f6\u5019\uff0cJava\u865a\u62df\u673a\u5c31\u5f97\u6839\u636e\u5305\u7684\u540d\u79f0\u6765\u786e\u5b9a\u4f60\u8981\u5f15\u7528\u7684\u5230\u5e95\u662f\u54ea\u4e2a\u533b\u9662\u7c7b\u4e86\u3002<br \/>\n\u800c\u6240\u8c13\u7f16\u8bd1\u5355\u5143\uff0c\u5927\u591a\u662f\u6307Java\u6e90\u4ee3\u7801\u6587\u4ef6\u3002\u4e00\u4e2a\u7f16\u8bd1\u5355\u5143\u7684\u540e\u7f00\u5c31\u662f.java\uff0c\u6587\u4ef6\u91cc\u53ea\u80fd\u6709\u4e00\u4e2apublic\u7684\u7c7b\u4e14\u8be5\u7c7b\u7684\u540d\u79f0\u4e0e\u6587\u4ef6\u540d\u76f8\u540c\uff0c\u5426\u5219\u5c31\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef\u3002Java\u89e3\u91ca\u5668\u7684\u8fd0\u884c\u8fc7\u7a0b\u5927\u81f4\u662f\uff1a\u627e\u51fa\u73af\u5883\u53d8\u91cfCLASSPATH\uff08\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u76ee\u5f55\uff09\u7528\u4f5c\u67e5\u627e.class\u6587\u4ef6\u7684\u6839\u76ee\u5f55\u3002\u4ece\u6839\u76ee\u5f55\u5f00\u59cb\uff0c\u89e3\u91ca\u5668\u83b7\u53d6\u5305\u7684\u540d\u79f0\u5e76\u5c06\u6bcf\u4e2a\u53e5\u70b9\u66ff\u6362\u4e3a\u53cd\u659c\u6760\\\uff0c\u6bd4\u5982 <em>\u6d59\u6c5f.\u676d\u5dde.\u897f\u6e56<\/em> \u5c31\u53d8\u6210\u4e86\u76ee\u5f55 <em>\u6d59\u6c5f\\\u676d\u5dde\\\u897f\u6e56<\/em>\uff08\u6839\u636e\u64cd\u4f5c\u7cfb\u7edf\u53ef\u80fd\u7565\u6709\u4e0d\u540c\uff0c\u53d8\u4e3a\u6b63\u659c\u6760\/\u4e5f\u662f\u6709\u53ef\u80fd\u7684\uff09\u3002\u968f\u540e\u89e3\u91ca\u5668\u5c31\u5728\u8fd9\u4e48\u4e2a\u76ee\u5f55\u4e2d\u67e5\u627e\u5bf9\u5e94\u4f60\u7ed9\u7684\u7c7b\u540d\u79f0\u7684.class\u6587\u4ef6\uff0c\u6bd4\u5982\u4e0a\u9762\u7684 <em>\u540c\u4ec1\u533b\u9662.class<\/em>\u3002<\/p>\n<h1>\u7f16\u8bd1\u6267\u884c\u6d41\u7a0b<\/h1>\n<p>\u4f30\u8ba1\u5927\u5bb6\u90fd\u77e5\u9053\uff0cJava\u4e2d\u7684\u7c7b\u53ef\u4ee5\u88ab\u52a8\u6001\u52a0\u8f7d\u5230Java\u865a\u62df\u673a\u4e2d\u6267\u884c\u3002\u4e0b\u9762\u8fd9\u5f20\u56fe(\u63a8\u8350https:\/\/www.processon.com\/\uff0c\u5728\u7ebf\u753b\u7b80\u5355\u6d41\u7a0b\u56fe\u7684\u597d\u4e1c\u897f)\u53ef\u4ee5\u5927\u81f4\u8bf4\u660e\uff1a<br \/>\n<a href=\"http:\/\/boweihe.me\/wp-content\/uploads\/2016\/05\/Java-Classloader.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2054 size-full\" src=\"http:\/\/boweihe.me\/wp-content\/uploads\/2016\/05\/Java-Classloader.png\" alt=\"Java Classloader\" width=\"740\" height=\"362\" \/><\/a><br \/>\nJava \u6e90\u7a0b\u5e8f\uff08.java \u6587\u4ef6\uff09\u5728\u7ecf\u8fc7 Java \u7f16\u8bd1\u5668\u7f16\u8bd1\u4e4b\u540e\u5c31\u88ab\u8f6c\u6362\u6210 Java \u5b57\u8282\u4ee3\u7801\uff08.class \u6587\u4ef6\uff09\u3002\u7c7b\u52a0\u8f7d\u5668\u8d1f\u8d23\u8bfb\u53d6 Java \u5b57\u8282\u4ee3\u7801\uff0c\u5e76\u8f6c\u6362\u6210<span class=\"lang:default decode:true crayon-inline \">java.lang.Class<\/span>\u00a0\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002\u6bcf\u4e2a\u8fd9\u6837\u7684\u5b9e\u4f8b\u7528\u6765\u8868\u793a\u4e00\u4e2a Java \u7c7b\u3002\u901a\u8fc7\u6b64\u5b9e\u4f8b\u7684<span class=\"lang:default decode:true crayon-inline \"> newInstance()<\/span>\u00a0\u65b9\u6cd5\u5c31\u53ef\u4ee5\u521b\u5efa\u51fa\u8be5\u7c7b\u7684\u4e00\u4e2a\u5bf9\u8c61\u3002\u5b9e\u9645\u7684\u60c5\u51b5\u53ef\u80fd\u66f4\u52a0\u590d\u6742\uff0c\u6bd4\u5982 Java \u5b57\u8282\u4ee3\u7801\u53ef\u80fd\u662f\u901a\u8fc7\u5de5\u5177\u52a8\u6001\u751f\u6210\u7684\uff0c\u4e5f\u53ef\u80fd\u662f\u901a\u8fc7\u7f51\u7edc\u4e0b\u8f7d\u7684\u3002<br \/>\n<strong>\u57fa\u672c\u4e0a\u6240\u6709\u7684\u7c7b\u52a0\u8f7d\u5668\u90fd\u662f<span class=\"lang:java decode:true crayon-inline \"> java.lang.ClassLoader<\/span>\u00a0\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/strong>\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\u4e00\u70b9\uff0c\u5c31\u662f\u901a\u8fc7\u4e0d\u540c\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u53ef\u4ee5\u52a0\u8f7d\u51fa\u4e0d\u540c\u7684Class\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n<h1>java.lang.ClassLoader<\/h1>\n<p>\u4e4b\u524d\u8bf4\u8fc7\u7c7b\u52a0\u8f7d\u5668\u662f\u5e72\u5565\u4f7f\u7684\uff0c\u9664\u4e86\u52a0\u8f7d\u7c7b\u4ee5\u5916\uff0c\u5176\u5b9e\u8bf8\u5982\u56fe\u50cf\u6587\u4ef6\u4ec0\u4e48\u7684\u8d44\u6e90\u4e5f\u662f\u5b83\u52a0\u8f7d\u7684\uff0c\u4e0d\u8fc7\u8fd9\u91cc\u6682\u4e14\u4e0d\u8c08\u3002<br \/>\njava.lang.ClassLoader\u5176\u5b9e\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u6709\u51e0\u4e2a\u6bd4\u8f83\u91cd\u8981\u7684\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><span class=\"lang:default decode:true crayon-inline \">getParent()<\/span>\u00a0\u7528\u4e8e\u8fd4\u56de\u8be5\u7c7b\u52a0\u8f7d\u5668\u7684\u7236\u7c7b\u52a0\u8f7d\u5668\uff1b\u8fd9\u4e2a\u65b9\u6cd5\u4e0e\u7ecf\u5e38\u80fd\u770b\u5230\u7684\u201c\u53cc\u4eb2\u59d4\u6d3e\u201d\u8fd9\u4e2a\u5173\u952e\u8bcd\u6709\u5173:)<\/li>\n<li><span class=\"lang:default decode:true crayon-inline \">loadClass(String name)<\/span>\u00a0\u52a0\u8f7d\u540d\u79f0\u4e3aname\u7684\u7c7b\uff0c\u8fd4\u56dejava.lang.Class\u5b9e\u4f8b\u3002<br \/>\n\u8be5\u65b9\u6cd5\u6709\u4e09\u6b65\uff1a<br \/>\n1.\u8c03\u7528findLoadedClass\u65b9\u6cd5\u770b\u770b\u662f\u4e0d\u662f\u5df2\u7ecf\u52a0\u8f7d\u8fc7\u8fd9\u4e2a\u7c7b\u4e86\uff1b<br \/>\n2.\u5982\u679c\u6ca1\u6709\uff0c\u5728\u7236\u7c7b\u52a0\u8f7d\u5668\u4e0a\u8c03\u7528loadClass\u65b9\u6cd5\u3002\u5982\u679c\u7236\u7c7b\u52a0\u8f7d\u5668\u662fnull\uff08\u554a..\u5230\u5e95\u4e86&#8230;\uff09\uff0c\u5219\u7528\u865a\u62df\u673a\u7684\u5185\u7f6e\u7c7b\u52a0\u8f7d\u5668\uff08\u4e0b\u9762\u8bb2\u5230\u7684\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\uff09\uff1b<br \/>\n3.\u8fd8\u662f\u4e0d\u884c\uff0c\u8c03\u7528findClass\u65b9\u6cd5\u67e5\u627e\u7c7b<\/li>\n<li><span class=\"lang:default decode:true crayon-inline \">findClass(String name)<\/span>\u00a0\u67e5\u627e\u540d\u79f0\u4e3aname\u7684\u7c7b\uff0c\u8fd4\u56dejava.lang.Class\u5b9e\u4f8b<\/li>\n<li><span class=\"lang:default decode:true crayon-inline \">findLoadedClass(String name)<\/span>\u00a0\u67e5\u627e\u4e00\u4e2a\u540d\u4e3aname\u7684\u5df2\u7ecf\u52a0\u8f7d\u8fc7\u7684\u7c7b\uff0c\u8fd4\u56dejava.lang.Class\u5b9e\u4f8b<\/li>\n<li><span class=\"lang:default decode:true crayon-inline \">defineClass(String name, byte[] b, int off, int len)<\/span>\u00a0\u628a\u5b57\u8282\u6570\u7ec4b\u4e2d\u7684\u5185\u5bb9\u8f6c\u6362\u4e3aJava\u7c7b\uff0c\u8fd4\u56dejava.lang.Class\u5b9e\u4f8b\uff0c\u8fd9\u662f\u4e2afinal\u65b9\u6cd5<\/li>\n<li><span class=\"lang:default decode:true crayon-inline \">resolveClass(Class&lt;?&gt; c)<\/span>\u00a0\u94fe\u63a5\u6307\u5b9a\u7684Java\u7c7b<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a\u91cc\u9762\u7684\u53c2\u6570name\u90fd\u662f\u4e8c\u8fdb\u5236\u540d\u79f0\u3002<br \/>\n\u7cfb\u7edf\u63d0\u4f9b\u7684\u7c7b\u52a0\u8f7d\u5668\u4e3b\u8981\u6709\u4e09\u7c7b\uff1a<\/p>\n<ul>\n<li>Bootstrap class loader: \u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\uff0c\u7528\u539f\u751f\u4ee3\u7801\u5199\u7684\uff0c\u7528\u9014\u5c31\u662fbootstrap Java\u7684\u6838\u5fc3\u5e93\u3002<\/li>\n<li>Extensions class loader: \u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\uff0c\u7528\u6765\u52a0\u8f7d\u6269\u5c55\u5e93\u3002<\/li>\n<li>System class loader: \u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668\uff0c\u6839\u636eJava\u5e94\u7528\u7c7b\u7684\u8def\u5f84(CLASSPATH)\u52a0\u8f7dJava\u7c7b\uff0c\u4e00\u822c\u6211\u4eec\u5199\u7684\u4e1c\u897f\u5c31\u662f\u5b83\u6765\u52a0\u8f7d\u7684\u3002<\/li>\n<\/ul>\n<p>\u9664\u4e86\u5199\u597d\u7684\u7c7b\u52a0\u8f7d\u5668\u5916\uff0c\u6211\u4eec\u53ef\u4ee5\u81ea\u5df1\u7ee7\u627fjava.lang.ClassLoader\u6765\u5b9e\u73b0\u81ea\u5df1\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u6ee1\u8db3\u4e00\u4e9b\u5947\u5947\u602a\u602a\u7684\u9700\u6c42\uff0c\u6bd4\u5982\u95ee\u98981&#8230;<\/p>\n<h2>getParent()\u2014\u2014\u627e\u201c\u7239\u201d\u65b9\u6cd5<\/h2>\n<p>\u5728\u53c2\u8003\u6587\u732e\u4e2d\u662f\u8fd9\u4e48\u5199\u7684\u201c\u5bf9\u4e8e\u5f00\u53d1\u4eba\u5458\u7f16\u5199\u7684\u7c7b\u52a0\u8f7d\u5668\u6765\u8bf4\uff0c\u5176\u7236\u7c7b\u52a0\u8f7d\u5668\u662f\u52a0\u8f7d\u6b64\u7c7b\u52a0\u8f7d\u5668 Java \u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668\u201d\uff0c\u662f\u4e0d\u662f\u5f88\u62d7\u53e3\uff1f\u6bd4\u5982\u6211\u4eec\u81ea\u5df1\u7ee7\u627f\u4e86\u4e2aClassLoader\u7c7b\u7684\u8bdd(\u5047\u8bbe\u4ed6\u53ebMyClassLoader)\uff0c\u4e00\u822c\u4f1a\u5728\u8fd9\u4e2a\u65b9\u6cd5\u91cc\u9762\u8fd4\u56deSystem class loader\uff0c\u4e3a\u5565\u5462\uff1f\u56e0\u4e3a\u6211\u4eec\u81ea\u5df1\u5199\u7684MyClassLoader\u4e5f\u662f\u4e2a\u7c7b\uff08\u5148\u6709\u9e21\u8fd8\u662f\u5148\u6709\u86cb\uff0c\u54c8\u54c8\uff09\uff0c\u4e5f\u9700\u8981\u4e00\u4e2a\u52a0\u8f7d\u5668\u628aMyClassLoader\u52a0\u8f7d\u4e86\uff0c\u6211\u4eec\u624d\u80fd\u7528\u5b83\u53bb\u52a0\u8f7d\u522b\u7684\u4e1c\u897f\u3002<br \/>\n\u6709\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5c31\u53ef\u4ee5\u5728\u52a0\u8f7d\u7c7b\u7684\u65f6\u5019\u6709\u4e00\u4e2a\u5411\u4e0a\u8ffd\u6eaf\u7684\u627e\u7c7b\u8fc7\u7a0b\uff0c\u8fd9\u4e2a\u611f\u89c9\u5c31\u6709\u70b9\u50cfJavaScript\u91cc\u9762\u7684XX\u94fe\uff08\u539f\u578b\u94fe\u3001\u4f5c\u7528\u57df\u94fe\u2026\u2026\u54e6\uff0c\u626f\u8fdc\u4e86\uff09\u3002\u7c7b\u52a0\u8f7d\u5668\u4e4b\u95f4\u53ef\u4ee5\u5f62\u6210\u6811\u5f62\u7ed3\u6784\uff0c\u6bd4\u5982\u4e0b\u9762\u8fd9\u6837\u5b50(\u56fe\u7248\u6743\u5f52IBM\u6240\u6709)\uff1a<br \/>\n<figure style=\"width: 564px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/www.ibm.com\/developerworks\/cn\/java\/j-lo-classloader\/image001.jpg\" width=\"564\" height=\"446\" \/><figcaption class=\"wp-caption-text\">\u7c7b\u52a0\u8f7d\u5668\u7684\u6811\u72b6\u7ed3\u6784<\/figcaption><\/figure><br \/>\n\u4e00\u8def\u90fd\u53ef\u4ee5getParent()\u4e0a\u53bb\uff0c\u6709\u4e9bJDK\u53ef\u80fd\u8f93\u51fa\u4e0d\u5230\u6700\u521d\u7684\u90a3\u4e2a\u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668\uff08AppClassLoader\u7684getParent()\u8fd4\u56de\u4e86null\uff09\u3002<\/p>\n<h2>\u7c7b\u52a0\u8f7d\u5668\u7684\u4ee3\u7406\u6a21\u5f0f\u2014\u2014&#8221;\u6211&#8221;\u662f&#8221;\u6211&#8221;?<\/h2>\n<p>Java\u865a\u62df\u673a\u600e\u4e48\u5224\u65ad\u4e24\u4e2a\u7c7b\u76f8\u540c\u5462\uff1f\u901a\u8fc7\u5305\u540d+\u7c7b\u540d\uff1f\u4e0d\u662f\u7684\uff0c\u8fd8\u5f97\u770b\u52a0\u8f7d\u8fd9\u4e2a\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668\u662f\u4e0d\u662f\u4e00\u6837\u3002\u672c\u6587\u7684\u7b2c\u4e00\u5f20\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u76f8\u540c\u7684\u5b57\u8282\u7801\uff0c\u88ab\u4e0d\u540c\u7684\u7c7b\u52a0\u8f7d\u5668\u52a0\u8f7d\u4e4b\u540e\uff0c\u5f97\u5230\u7684Class\u7c7b\u5b9e\u4f8b\u662f\u4e0d\u540c\u7684\u3002<br \/>\n\u4e0d\u540c\u7684\u7c7b\u52a0\u8f7d\u5668\u4f7f\u5f97\u5305\u3001\u7c7b\u540d\u79f0\u5b8c\u5168\u76f8\u540c\u7684\u4e24\u4e2a\u7c7b\u53ef\u4ee5\u5e76\u5b58\u5728Java\u865a\u62df\u673a\u4e2d\uff0c\u4e14\u4e0d\u540c\u52a0\u8f7d\u5668\u52a0\u8f7d\u7684\u7c7b\u4e4b\u95f4\u662f\u4e0d\u517c\u5bb9\u7684\u3002\u4ee3\u7406\u6a21\u5f0f\u7684\u8bbe\u8ba1\u52a8\u673a\u662f\u4fdd\u8bc1Java\u6838\u5fc3\u5e93\u7684\u7c7b\u578b\u5b89\u5168\u3002\u6211\u4eec\u77e5\u9053java.lang.Object\u7c7b\u662f\u201d\u4e07\u7269\u7684\u57fa\u7840\u201c\uff0c\u5982\u8fc7\u8fd9\u4e2a\u4e1c\u897f\u80fd\u591f\u7528\u81ea\u5df1\u7684\u7c7b\u52a0\u8f7d\u5668\u6765\u5148\u52a0\u8f7d\u7684\u8bdd\uff0c\u90a3\u5c31\u53ef\u80fd\u5b58\u5728\u591a\u4e2a\u7248\u672c\u7684java.lang.Object\u7c7b\u5e76\u4e14\u4ed6\u4eec\u8fd8\u4e92\u4e0d\u517c\u5bb9\uff0c\u8fd9\u5c31\u61f5\u903c\u4e86\u3002<\/p>\n<h1>\u52a0\u8f7d\u7c7b\u7684\u8fc7\u7a0b<\/h1>\n<p>\u9996\u5148\u660e\u786e\u4e00\u70b9\uff0c\u7531\u4e8e\u7c7b\u7684\u52a0\u8f7d\u662f\u81ea\u9876\u5411\u4e0b\u5c1d\u8bd5\u7684\uff0c\u771f\u6b63\u5b8c\u6210\u7c7b\u52a0\u8f7d\u5de5\u4f5c\u7684\u52a0\u8f7d\u5668\u548c\u542f\u52a8\u52a0\u8f7d\u8fc7\u7a0b\u7684\u52a0\u8f7d\u5668\u6709\u53ef\u80fd\u4e0d\u662f\u540c\u4e00\u4e2a\u3002<br \/>\ndefineClass\u65b9\u6cd5\u7684\u4f5c\u7528\u662f\u201d\u771f\u6b63\u7684\u201c\u5b8c\u6210\u7c7b\u7684\u52a0\u8f7d\u8fc7\u7a0b\uff08\u4f60\u770b\u5b83\u7684\u4f20\u5165\u53c2\u6570\uff0c\u5b57\u8282\u6570\u7ec4\u4ec0\u4e48\u7684\uff0c\u591a\u4e48\u6734\u5b9e\uff09\uff0c\u6267\u884c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u52a0\u8f7d\u5668\u88ab\u79f0\u4f5c\u5b9a\u4e49\u52a0\u8f7d\u5668\uff1b\u542f\u52a8\u7c7b\u7684\u52a0\u8f7d\u8fc7\u7a0b\u662f\u8c03\u7528loadClass\u65b9\u6cd5\u5b9e\u73b0\u7684\uff08\u5b83\u53ea\u8981\u7ed9\u4e2a\u540d\u5b57\u5c31\u884c\uff09\uff0c\u6267\u884c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u52a0\u8f7d\u5668\u53eb\u505a\u521d\u59cb\u52a0\u8f7d\u5668\uff0c\u5b83\u8981\u627e\u4e0d\u5230\u7c7b\u7684\u8bdd\uff0c\u5c31\u629b\u51fa\u4e2aClassNotFoundException\u5f02\u5e38\u3002\u6210\u529f\u52a0\u8f7d\u4e00\u4e2a\u7c7b\u540e\uff0c\u4f1a\u628a\u5f97\u5230\u7684Class\u7c7b\u5b9e\u4f8b\u7f13\u5b58\u8d77\u6765\uff0c\u4e0b\u6b21\u8bf7\u6c42\u65f6\u5c31\u4e0d\u4f1a\u91cd\u590d\u52a0\u8f7d\u4e86\uff0c\u5373\u5bf9\u4e8e\u4e00\u4e2a\u7c7b\uff08\u5168\u540d\u8868\u793a\uff09\u6765\u8bf4\uff0cloadClass\u65b9\u6cd5\u4e0d\u4f1a\u5728\u4e00\u4e2aclassLoader\u91cc\u5934\u91cd\u590d\u8c03\u7528\u3002<br \/>\n&nbsp;<br \/>\n\u989d\uff0c\u5982\u679c\u6709\u7a7a\u7684\u8bdd\uff0c\u4e0b\u4e00\u7bc7\u4f1a\u5b9e\u4f5c\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7684ClassLoader\u3002<\/p>\n<h3>\u53c2\u8003\u6587\u732e<\/h3>\n<ul>\n<li>\u5f7b\u5e95\u641e\u61c2Java Classloader:\u00a0<a href=\"http:\/\/weli.iteye.com\/blog\/1682625\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/weli.iteye.com\/blog\/1682625<\/a><\/li>\n<li>\u6df1\u5165\u63a2\u8ba8Java\u7c7b\u52a0\u8f7d\u5668\uff1ahttps:\/\/www.ibm.com\/developerworks\/cn\/java\/j-lo-classloader\/<\/li>\n<li>\u300aJava\u7f16\u7a0b\u601d\u60f3\uff08\u7b2c\u56db\u7248\uff09\u300b<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u4ebaJava\u83dc\u9e21\u4e00\u679a\uff0c\u5982\u679c\u4e0b\u9762\u7684\u5185\u5bb9\u6709\u8bef\uff0c\u8bf7\u5404\u4f4d\u62fc\u547d\u7559\u8a00\uff0c\u6211\u79d2\u79d2\u949f\u6539\uff01 \u505a\u9879\u76ee\u7684\u540c\u65f6\u52aa\u529b\u8865\u5168\u77e5\u8bc6\u70b9\u6216\u8bb8\u662f\u5f53\u52a1\u4e4b\u6025\uff1f \u95ee\u9898 \u6b64\u9762\u8bd5\u95ee\u9898\u66b4\u9732\u4e86\u6211\u5bf9Java\u5185\u90e8\u539f\u7406\u7684\u65e0\u77e5\uff0c\u54c8\u54c8\uff0c\u8d76\u7d27\u5b66\u3002\u9898\u5916\u8bdd\uff1a\u6362\u505a\u9762C++\u7684\u8bdd\uff0c\u6211\u4f30\u8ba1\u9762\u8bd5\u5b98\u4f1a\u7528\u4e00\u4e2a\u591a\u7ee7\u627f\u91cc\u5934\u7684\u95ee\u9898\u6765\u8003\u3002 \u6709a.jar\u548cb.jar\uff0c\u91cc\u9762\u90fd\u6709\u67d0\u4e2a\u7c7bMyClass\u4e14\u4ed6\u4eec\u7684\u5305\u540d\u5b8c\u5168\u76f8\u540c\uff0c\u4f46\u662f\u6709\u4e0d\u540c\u7684foo()\u65b9\u6cd5\uff0c\u5728\u4e00\u4e2a\u9879\u76ee\u4e2d\u540c\u65f6\u5f15\u5165\u8fd9\u4e24\u4e2ajar\u4f1a\u51fa\u73b0\u4ec0\u4e48\u5947\u5999\u7684\u4e8b\u60c5\u5462\uff1f \u8fd9\u4e2a\u95ee\u9898\u7684\u7b54\u6848\u662f\uff0c\u8981\u6839\u636e\u7c7b\u52a0\u8f7d\u5668\u7684\u52a0\u8f7d\u987a\u5e8f\u6765\u51b3\u5b9a\u6211\u4eec\u6784\u5efaMyClass\u5bf9\u8c61\u7684\u65f6\u5019\u7a76\u7adf\u4f1a\u5148\u627e\u5230\u54ea\u4e2ajar\u91cc\u5934\u7684\u6587\u4ef6\uff0ca.jar\/b.jar\u54ea\u4e2a\u8fd0\u6c14\u597d\u62d4\u5f97\u5934\u7b79\u4e86\uff0c\u5269\u4e0b\u7684\u5c31\u88ab\u5ffd\u89c6\u4e86\u3002 \u5982\u679c\u6211\u4eec\u6784\u5efa\u4e86\u4e0d\u540c\u7684\u7c7b\u52a0\u8f7d\u5668\u5bf9\u8c61\u7684\u8bdd\uff0c\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u7684\u7c7b\u52a0\u8f7d\u5668\u6765\u540c\u65f6\u52a0\u8f7d\u8fd9\u4e24\u4e2a\u957f\u5f97\u770b\u8d77\u6765\u4e00\u6a21\u4e00\u6837\u7684\u7c7b\uff0c\u5e76\u4e14\u53ef\u4ee5\u5404\u81ea\u8c03\u7528\u5176\u65b9\u6cd5\u5c5e\u6027\u4ec0\u4e48\u7684\u3002 \u66f4\u8be6\u5c3d\u7684\u56de\u7b54\u53ef\u4ee5\u770b\u8fd9\u91cc\uff1ahttp:\/\/stackoverflow.com\/questions\/6879652\/possible-to-use-two-java-classes-with-same-name-and-same-package \u5305(Package)\u3001\u7f16\u8bd1\u5355\u5143 C\/C++\u91cc\u9762\u7528#include\u6765\u8868\u793a\u5f15\u7528\u7684\u7c7b\uff08\u6587\u4ef6\uff09\uff0c\u5e76\u4e14\u7528\u8fc7C++\u7684\u76c6\u53cb\u80af\u5b9a\u77e5\u9053namespace\u00a0\u8fd9\u4e2a\u5173\u952e\u5b57\u53ef\u4ee5\u7528\u6765\u9694\u79bb\u540d\u5b57\u76f8\u540c\u4e1c\u897f\uff0c\u6700\u5e38\u89c1\u7684\u83ab\u8fc7\u4e8eusing namespace std;\u00a0\u4e86\u3002\u4ee5\u4e0a\u8fd9\u4e9b\u4e0e\u6240\u8c13\u201c\u8bbf\u95ee\u6743\u9650\u63a7\u5236\u201d\u6709\u5173\uff08\u8be6\u89c1\u300aJava\u7f16\u7a0b\u601d\u60f3\u300b\u7b2c6\u7ae0\uff09\u3002 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