{"id":698,"date":"2023-03-23T21:50:23","date_gmt":"2023-03-23T13:50:23","guid":{"rendered":""},"modified":"2023-03-23T21:50:23","modified_gmt":"2023-03-23T13:50:23","slug":"Java\u865a\u62df\u673a","status":"publish","type":"post","link":"https:\/\/bianchenghao6.com\/698.html","title":{"rendered":"Java\u865a\u62df\u673a"},"content":{"rendered":"


\n <\/head>
\n <\/p>\n

\n

Java\u865a\u62df\u673a<\/h1>\n<\/p><\/div>\n
\n JVM\uff08Java\u865a\u62df\u673a\uff09\u662f\u62bd\u8c61\u673a\u3002\u5b83\u662f\u63d0\u4f9b\u53ef\u5728\u5176\u4e2d\u6267\u884cJava\u5b57\u8282\u7801\u7684\u8fd0\u884c\u65f6\u73af\u5883\u7684\u89c4\u8303\u3002
\n
JVM\u53ef\u7528\u4e8e\u8bb8\u591a\u786c\u4ef6\u548c\u8f6f\u4ef6\u5e73\u53f0\uff08\u5373JVM\u53d6\u51b3\u4e8e\u5e73\u53f0\uff09\u3002\n <\/div>\n

\u4ec0\u4e48\u662fJVM\uff1f<\/h2>\n
\n \u5b83\u662f\uff1a\n <\/div>\n

\u4e00\u4e2a\u89c4\u8303\uff0c\u5176\u4e2dJava\u865a\u62df\u673a\u7684\u5de5\u4f5c\u88ab\u6307\u5b9a\u3002\u4f46\u662f\u5b9e\u73b0\u63d0\u4f9b\u8005\u662f\u72ec\u7acb\u9009\u62e9\u7b97\u6cd5\u7684\u3002\u5b83\u7684\u5b9e\u73b0\u5df2\u7531Oracle\u548c\u5176\u4ed6\u516c\u53f8\u63d0\u4f9b\u3002<\/span>
\n \u4e00\u4e2a\u5b9e\u73b0\u5176\u5b9e\u73b0\u79f0\u4e3aJRE\uff08Java\u8fd0\u884c\u65f6\u73af\u5883\uff09\u3002<\/span>
\n \u8fd0\u884c\u65f6\u5b9e\u4f8b\u6bcf\u5f53\u60a8\u5728\u547d\u4ee4\u63d0\u793a\u7b26\u4e0b\u7f16\u5199Java\u547d\u4ee4\u4ee5\u8fd0\u884cJava\u7c7b\u65f6\uff0c\u90fd\u4f1a\u521b\u5efaJVM\u5b9e\u4f8b\u3002<\/span> <\/p>\n

\u5b83\u80fd\u505a\u4ec0\u4e48\uff1f<\/h2>\n
\n JVM\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a\n <\/div>\n

\u52a0\u8f7d\u4ee3\u7801<\/span>
\n \u9a8c\u8bc1\u7801<\/span>
\n \u6267\u884c\u4ee3\u7801<\/span>
\n \u63d0\u4f9b\u8fd0\u884c\u65f6\u73af\u5883<\/span> <\/p>\n

\n JVM\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u5b9a\u4e49\uff1a\n <\/div>\n

\u8bb0\u5fc6\u533a<\/span>
\n \u7c7b\u6587\u4ef6\u683c\u5f0f<\/span>
\n \u5bc4\u5b58\u5668\u96c6<\/span>
\n \u5783\u573e\u6536\u96c6\u5806<\/span>
\n \u81f4\u547d\u9519\u8bef\u62a5\u544a\u7b49<\/span> <\/p>\n

JVM\u67b6\u6784<\/h2>\n
\n \u8ba9\u6211\u4eec\u4e86\u89e3JVM\u7684\u5185\u90e8\u4f53\u7cfb\u7ed3\u6784\u3002\u5b83\u5305\u542b\u7c7b\u52a0\u8f7d\u5668\uff0c\u5185\u5b58\u533a\u57df\uff0c\u6267\u884c\u5f15\u64ce\u7b49\u3002\n <\/div>\n

Java\u865a\u62df\u673a_https:\/\/bianchenghao6.com_\u3010Java \u57fa\u7840\u6559\u7a0b\u3011_\u7b2c1\u5f20 <\/p>\n

1\uff09\u7c7b\u52a0\u8f7d\u5668<\/h3>\n
\n Classloader\u662fJVM\u7684\u5b50\u7cfb\u7edf\uff0c\u7528\u4e8e\u52a0\u8f7d\u7c7b\u6587\u4ef6\u3002\u6bcf\u5f53\u6211\u4eec\u8fd0\u884cJava\u7a0b\u5e8f\u65f6\uff0c\u5b83\u90fd\u4f1a\u7531\u7c7b\u52a0\u8f7d\u5668\u9996\u5148\u52a0\u8f7d\u3002Java\u4e2d\u6709\u4e09\u4e2a\u5185\u7f6e\u7684\u7c7b\u52a0\u8f7d\u5668\u3002\n <\/div>\n
\n Bootstrap ClassLoader\uff1a<\/strong>\u8fd9\u662f\u7b2c\u4e00\u4e2a\u7c7b\u52a0\u8f7d\u5668\uff0c\u5b83\u662fExtension\u7c7b\u52a0\u8f7d\u5668\u7684\u8d85\u7c7b\u3002\u5b83\u4f1a\u52a0\u8f7drt.jar\u6587\u4ef6\uff0c\u5176\u4e2d\u5305\u542bJava Standard Edition\u7684\u6240\u6709\u7c7b\u6587\u4ef6\uff0c\u4f8b\u5982java.lang\u5305\u7c7b\uff0cjava.net\u5305\u7c7b\uff0cjava.util\u5305\u7c7b\uff0cjava.io\u5305\u7c7b\uff0cjava.sql\u5305\u7c7b\u7b49\u3002\n <\/div>\n
\n Extension ClassLoader: <\/strong>\u8fd9\u662fBootstrap\u7684\u5b50\u7c7b\u52a0\u8f7d\u5668\uff0c\u662fSystem\u7c7b\u52a0\u8f7d\u5668\u7684\u7236\u7c7b\u52a0\u8f7d\u5668\u3002\u5b83\u52a0\u8f7d\u4f4d\u4e8e$ JAVA_HOME \/ jre \/ lib \/ ext\u76ee\u5f55\u4e2d\u7684jar\u6587\u4ef6\u3002\n <\/div>\n
\n System \/ Application ClassLoader\uff1a<\/strong>\u8fd9\u662f\u6269\u5c55\u7c7b\u52a0\u8f7d\u5668\u7684\u5b50\u7c7b\u52a0\u8f7d\u5668\u3002\u5b83\u4ece\u7c7b\u8def\u5f84\u52a0\u8f7d\u7c7b\u6587\u4ef6\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cclasspath\u8bbe\u7f6e\u4e3a\u5f53\u524d\u76ee\u5f55\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u201c -cp\u201d\u6216\u201c -classpath\u201d\u5f00\u5173\u66f4\u6539\u7c7b\u8def\u5f84\u3002\u5b83\u4e5f\u88ab\u79f0\u4e3a\u5e94\u7528\u7a0b\u5e8f\u7c7b\u52a0\u8f7d\u5668\u3002\n <\/div>\n
\n
 public class ClassLoaderExample 
 { 
     public static void main(String[] args) 
     { 
         Class c=ClassLoaderExample.class; 
         System.out.println<\/span>(c.getClassLoader<\/span>()); 
         classloader 
         System.out.println<\/span>(String.class.getClassLoader<\/span>()); 
     } 
 } 
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8f93\u51fa:\n  <\/div>\n
\n
sun.misc.Launcher$AppClassLoader@4e0e2f2a \n
 null<\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd9\u4e9b\u662fJava\u63d0\u4f9b\u7684\u5185\u90e8\u7c7b\u52a0\u8f7d\u5668\u3002\u5982\u679c\u8981\u521b\u5efa\u81ea\u5df1\u7684\u7c7b\u52a0\u8f7d\u5668\uff0c\u5219\u9700\u8981\u6269\u5c55ClassLoader\u7c7b\u3002\n  <\/div>\n
2\uff09\u7c7b\u522b\uff08\u65b9\u6cd5\uff09\u533a\u57df<\/h3>\n
\n    Class\uff08Method\uff09\u533a\u57df\u5b58\u50a8\u6bcf\u4e2a\u7c7b\u7684\u7ed3\u6784\uff0c\u4f8b\u5982\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\uff0c\u5b57\u6bb5\u548c\u65b9\u6cd5\u6570\u636e\uff0c\u65b9\u6cd5\u4ee3\u7801\u3002\n  <\/div>\n
3\uff09\u5806<\/h3>\n
\n    \u8fd9\u662f\u5728\u5176\u4e2d\u5206\u914d\u5bf9\u8c61\u7684\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\u3002\n  <\/div>\n
4\uff09\u5806\u53e0<\/h3>\n
\n    Java Stack\u5b58\u50a8\u6846\u67b6\u3002\u5b83\u4fdd\u5b58\u5c40\u90e8\u53d8\u91cf\u548c\u90e8\u5206\u7ed3\u679c\uff0c\u5e76\u5728\u65b9\u6cd5\u8c03\u7528\u548c\u8fd4\u56de\u4e2d\u8d77\u4f5c\u7528\u3002
\n   
\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u4e00\u4e2a\u4e13\u7528\u7684JVM\u5806\u6808\uff0c\u4e0e\u8be5\u7ebf\u7a0b\u540c\u65f6\u521b\u5efa\u3002
\n   
\u6bcf\u6b21\u8c03\u7528\u65b9\u6cd5\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u6846\u67b6\u3002\u6846\u67b6\u7684\u65b9\u6cd5\u8c03\u7528\u5b8c\u6210\u540e\u5c06\u9500\u6bc1\u3002\n  <\/div>\n
5\uff09\u7a0b\u5e8f\u8ba1\u6570\u5668\u5bc4\u5b58\u5668<\/h3>\n
\n    PC\uff08\u7a0b\u5e8f\u8ba1\u6570\u5668\uff09\u5bc4\u5b58\u5668\u5305\u542b\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684Java\u865a\u62df\u673a\u6307\u4ee4\u7684\u5730\u5740\u3002\n  <\/div>\n
6\uff09\u672c\u673a\u65b9\u6cd5\u5806\u6808<\/h3>\n
\n    \u5b83\u5305\u542b\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u7684\u6240\u6709\u672c\u673a\u65b9\u6cd5\u3002\n  <\/div>\n
7\uff09\u6267\u884c\u5f15\u64ce<\/h3>\n
\n    \u5b83\u5305\u542b\u4e86\uff1a
\n   
\u865a\u62df\u5904\u7406\u5668
\n   
 \u89e3\u91ca\u5668\uff1a\u8bfb\u53d6\u5b57\u8282\u7801\u6d41\uff0c\u7136\u540e\u6267\u884c\u6307\u4ee4\u3002
\n   
 \u5373\u65f6\uff08JIT\uff09\u7f16\u8bd1\u5668\uff1a\u7528\u4e8e\u63d0\u9ad8\u6027\u80fd\u3002JIT\u540c\u65f6\u7f16\u8bd1\u5177\u6709\u76f8\u4f3c\u529f\u80fd\u7684\u5b57\u8282\u7801\u90e8\u5206\uff0c\u56e0\u6b64\u51cf\u5c11\u4e86\u7f16\u8bd1\u6240\u9700\u7684\u65f6\u95f4\u3002\u5728\u6b64\uff0c\u672f\u8bed\u201c\u7f16\u8bd1\u5668\u201d\u662f\u6307\u4eceJava\u865a\u62df\u673a\uff08JVM\uff09\u7684\u6307\u4ee4\u96c6\u5230\u7279\u5b9aCPU\u7684\u6307\u4ee4\u96c6\u7684\u8f6c\u6362\u5668\u3002\n  <\/div>\n
8\uff09Java\u672c\u673a\u63a5\u53e3<\/h3>\n
\n    Java\u672c\u673a\u63a5\u53e3\uff08JNI\uff09\u662f\u4e00\u4e2a\u6846\u67b6\uff0c\u63d0\u4f9b\u4e0e\u4f7f\u7528C\uff0cC ++\uff0cAssembly\u7b49\u5176\u4ed6\u8bed\u8a00\u7f16\u5199\u7684\u53e6\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u8fdb\u884c\u901a\u4fe1\u7684\u63a5\u53e3\u3002Java\u4f7f\u7528JNI\u6846\u67b6\u5c06\u8f93\u51fa\u53d1\u9001\u5230\u63a7\u5236\u53f0\u6216\u4e0eOS\u5e93\u8fdb\u884c\u4ea4\u4e92\u3002\n  <\/div>\n
 <\/body>
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