{"id":104700,"date":"2026-09-13T01:33:11","date_gmt":"2026-09-12T17:33:11","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/104700.html"},"modified":"2026-09-13T01:33:11","modified_gmt":"2026-09-12T17:33:11","slug":"java%e7%a8%8b%e5%ba%8f%e8%99%90%e6%88%91%e5%8d%83%e7%99%be%e9%81%8d%ef%bc%8c%e6%88%91%e5%be%85%e4%bb%a3%e7%a0%81%e5%a6%82%e5%88%9d%e6%81%8b%ef%bc%81%e8%bf%99hello-world%e4%b9%9f%e6%95%a2%e5%8f%ab","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/104700.html","title":{"rendered":"Java\u7a0b\u5e8f\u8650\u6211\u5343\u767e\u904d\uff0c\u6211\u5f85\u4ee3\u7801\u5982\u521d\u604b\uff01\u8fd9Hello World\u4e5f\u6562\u53eb\u7b80\u5355\uff1f"},"content":{"rendered":"

\u8d44\u6df1\u8f6f\u4ef6\u5f00\u53d1\u5de5\u7a0b\u5e08，\u4e1a\u4f59\u9a6c\u62c9\u677e\u9009\u624b\u3002<\/p>\n

\u6211\u4eec\u6765\u7f16\u5199\u7b2c\u4e00\u4e2aJava\u7a0b\u5e8f\u3002<\/p>\n

\u6253\u5f00\u6587\u672c\u7f16\u8f91\u5668，\u8f93\u5165\u4ee5\u4e0b\u4ee3\u7801：<\/p>\n

public class Hello {
\n public static void main(String[] args) {
\n System.out.println("Hello, world!");
\n }
\n}<\/p>\n

\u5728\u4e00\u4e2aJava\u7a0b\u5e8f\u4e2d，\u4f60\u603b\u80fd\u627e\u5230\u4e00\u4e2a\u7c7b\u4f3c：<\/p>\n

public class Hello {
\n …
\n}<\/p>\n

\u79f0\u4f5cclass（\u7c7b）\u7684\u8fd9\u4e2a\u5b9a\u4e49, \u8fd9\u91cc\u7c7b\u540d\u662fHello, \u5176\u5927\u5c0f\u5199\u654f\u611f, class\u7528\u4e8e\u5b9a\u4e49\u4e00\u4e2a\u7c7b, \u8868\u660e\u8fd9\u4e2a\u7c7b\u662f\u516c\u5f00\u7684, class\u90fd\u662fJava\u7684\u5173\u952e\u5b57\u5e76\u4e14\u5fc5\u987b\u5c0f\u5199, Hello\u662f\u7c7b\u7684\u540d\u5b57, \u4f9d\u7167\u4e60\u60ef\u9996\u5b57\u6bcdH\u8981\u5927\u5199, \u82b1\u62ec\u53f7{}\u4e2d\u95f4\u662f\u7c7b\u7684\u5b9a\u4e49\u3002<\/p>\n

\u6ce8\u610f\u5230\u7c7b\u7684\u5b9a\u4e49\u4e2d，\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3amain\u7684\u65b9\u6cd5：<\/p>\n<\/p>\n

public static void main(String[] args) {
\n …
\n }<\/p>\n

\u4ee3\u7801\u5757\u662f\u53ef\u88ab\u6267\u884c\u7684\u65b9\u6cd5, \u4e00\u4e2a\u65b9\u6cd5, \u9664\u4e86\u540d\u4e3amain\u7684\u65b9\u6cd5\u540d\u4e4b\u5916, \u8fd8\u6709\u7528\u62ec\u53f7\u62ec\u8d77\u6765\u7684\u65b9\u6cd5\u53c2\u6570, \u5728\u6b64\u5904, main\u65b9\u6cd5\u5b58\u5728\u4e00\u4e2a\u53c2\u6570, \u53c2\u6570\u7684\u7c7b\u578b\u662f, \u53c2\u6570\u7684\u540d\u5b57\u662fargs, \u7528\u6765\u4fee\u9970\u65b9\u6cd5, \u6b64\u5904\u610f\u5473\u7740\u5b83\u662f\u4e00\u4e2a\u516c\u5f00\u7684\u9759\u6001\u65b9\u5f0f, void\u662f\u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b, \u800c\u4f4d\u4e8e\u82b1\u62ec\u53f7\u4e2d\u95f4\u7684\u90e8\u5206\u4fbf\u662f\u65b9\u6cd5\u7684\u4ee3\u7801\u3002<\/p>\n

\u65b9\u6cd5\u7684\u4ee3\u7801\u6bcf\u4e00\u884c\u7528;\u7ed3\u675f，\u8fd9\u91cc\u53ea\u6709\u4e00\u884c\u4ee3\u7801，\u5c31\u662f：<\/p>\n<\/p>\n

System.out.println("Hello, world!");<\/p>\n

\u5b83\u7528\u6765\u6253\u5370\u4e00\u4e2a\u5b57\u7b26\u4e32\u5230\u5c4f\u5e55\u4e0a\u3002<\/p>\n

\u6309\u7167Java\u7684\u89c4\u5b9a\u6765\u8bb2, \u6709\u4e00\u4e2a\u7279\u5b9a\u7684\u6761\u4ef6, \u90a3\u5c31\u662f\u67d0\u4e2a\u7c7b\u6240\u5b9a\u4e49\u7684void main( args)\u8fd9\u4e2a\u65b9\u6cd5, \u5b83\u662fJava\u7a0b\u5e8f\u7684\u56fa\u5b9a\u5165\u53e3\u65b9\u6cd5, \u57fa\u4e8e\u6b64, \u6709\u8fd9\u6837\u4e00\u4e2a\u7ed3\u679c, \u90a3\u5c31\u662fJava\u7a0b\u5e8f\u603b\u662f\u4ecemain\u65b9\u6cd5\u5f00\u59cb\u6267\u884c\u3002<\/p>\n

\u7559\u610f\u5230Java\u6e90\u7801\u7684\u7f29\u8fdb\u5e76\u975e\u662f\u5fc5\u5b9a\u8981\u6709\u7684, \u7136\u800c\u4f7f\u7528\u7f29\u8fdb\u4e4b\u540e, \u683c\u5f0f\u663e\u5f97\u7f8e\u89c2, \u6781\u6613\u53d1\u89c9\u4ee3\u7801\u5757\u7684\u8d77\u59cb\u4ee5\u53ca\u7ed3\u675f，\u7f29\u8fdb\u901a\u5e38\u662f4\u4e2a\u7a7a\u683c\u6216\u8005\u4e00\u4e2atab\u3002<\/p>\n

\u4e4b\u540e, \u5728\u6211\u4eec\u5c06\u4ee3\u7801\u5b58\u4e3a\u6587\u4ef6\u4e4b\u9645, \u6587\u4ef6\u7684\u540d\u79f0\u5f97\u662fHello.java, \u5e76\u4e14\u6587\u4ef6\u540d\u5bf9\u4e8e\u5927\u5c0f\u5199\u4e5f\u662f\u9700\u8981\u7559\u610f\u7684, \u7f18\u7531\u5728\u4e8e\u8981\u8ddf\u6211\u4eec\u6240\u5b9a\u4e49\u7684\u7c7b\u540dHello\u5168\u7136\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n

\u5982\u4f55\u8fd0\u884cJava\u7a0b\u5e8f<\/p>\n

Java\u6e90\u7801\u4ece\u672c\u8d28\u800c\u8a00\u662f\u4e2a\u6587\u672c\u6587\u4ef6, \u6211\u4eec\u5f97\u5148\u7528javac\u5c06Hello.java\u7f16\u8bd1\u6210\u5b57\u8282\u7801\u6587\u4ef6Hello.class, \u63a5\u7740, \u8fd0\u7528java\u547d\u4ee4\u53bb\u6267\u884c\u8fd9\u4e2a\u5b57\u8282\u7801\u6587\u4ef6:<\/p>\n<\/p>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 Hello.java \u2502\u2500\u2500 source code
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2502 compile<\/p>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 Hello.class \u2502\u2500\u2500 byte code
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2502 execute<\/p>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 Run on JVM \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

\u6240\u4ee5, \u90a3\u53ef\u6267\u884c\u7684\u6587\u4ef6javac\u5c5e\u4e8e\u7f16\u8bd1\u5668\u8303\u7574, \u7136\u800c\u90a3\u53ef\u6267\u884c\u6587\u4ef6java\u5374\u662f\u865a\u62df\u673a\u3002<\/p>\n

step1, \u4e8e\u5b58\u653eHello.java\u7684\u90a3\u4e2a\u76ee\u5f55\u91cc, \u53bb\u6267\u884c\u540d\u4e3ajavac Hello.java\u7684\u547d\u4ee4\u3002<\/p>\n<\/p>\n

$ javac Hello.java<\/p>\n

\u82e5\u6e90\u4ee3\u7801\u4e0d\u5b58\u5728\u9519\u8bef, \u4e0a\u8ff0\u6240\u63d0\u53ca\u7684\u547d\u4ee4\u5219\u4e0d\u4f1a\u51fa\u73b0\u4efb\u4f55\u8f93\u51fa\u60c5\u51b5, \u5e76\u4e14\u5728\u5f53\u524d\u6240\u5904\u7684\u76ee\u5f55\u4e4b\u4e0b\u5c06\u4f1a\u751f\u6210\u4e00\u4e2a\u540d\u4e3aHello.class\u7684\u6587\u4ef6, \u7531\u6b64\u53ef\u89c1\u3002<\/p>\n<\/p>\n

$ ls
\nHello.classHello.java<\/p>\n

\u7b2c\u4e00\u6b65, \u5148\u627e\u5230Hello.class\u6587\u4ef6, \u7b2c\u4e8c\u6b65, \u5728\u627e\u5230\u8be5\u6587\u4ef6\u540e, \u8c03\u7528\u547d\u4ee4java Hello\u6765\u6267\u884c\u8fd9\u4e2a\u6587\u4ef6, \u8981\u6ce8\u610f\u7684\u662f, \u8fd9\u91cc\u4f7f\u7528\u7684\u547d\u4ee4\u662fjava Hello, \u800c\u4e0d\u662fjava Hello.class\u3002<\/p>\n<\/p>\n

$ java Hello
\nHello, world!<\/p>\n

\u9700\u6ce8\u610f, \u5411\u865a\u62df\u673a\u6240\u4f20\u9012\u7684\u53c2\u6570Hello, \u5b83\u5c5e\u4e8e\u6211\u4eec\u6240\u5b9a\u4e49\u7684\u7c7b\u540d, \u865a\u62df\u673a\u81ea\u7136\u800c\u7136\u5730\u4f1a\u53bb\u67e5\u627e\u4e0e\u4e4b\u5bf9\u5e94\u7684class\u6587\u4ef6, \u5e76\u4e14\u4e88\u4ee5\u6267\u884c\u3002<\/p>\n

\u5982\u679c\u6267\u884cjava Hello\u62a5\u9519：<\/p>\n<\/p>\n

$ java Hello
\nError: Could not find or load main class Hello
\nCaused by: java.lang.ClassNotFoundException: Hello<\/p>\n

\u51fa\u73b0\u4e86on\u4fe1\u606f, \u8fd9\u8868\u660e\u5728\u5f53\u4e0b\u7684\u76ee\u5f55\u91cc, \u5e76\u4e0d\u5b58\u5728\u540d\u4e3aHello.class\u7684\u8fd9\u4e2a\u6587\u4ef6, \u90a3\u4e48\u5c31\u8981\u5207\u6362\u81f3Hello.class\u6240\u5728\u7684\u76ee\u6807\u76ee\u5f55, \u4e4b\u540e\u518d\u53bb\u6267\u884cjava Hello\u3002<\/p>\n

\u6709\u4e9b\u7ae5\u978b\u6216\u8bb8\u6653\u5f97, \u76f4\u63a5\u53bb\u8fd0\u884cjava, Hello.java\u8fd9\u6837\u505a\u4e5f\u662f\u884c\u5f97\u901a\u7684:<\/p>\n

$ java Hello.java
\nHello, world!<\/p>\n

\u8fd9\u662f\u4e00\u9879\u4eceJava 11\u8d77\u624d\u5f00\u59cb\u6709\u7684\u65b0\u589e\u529f\u80fd, \u5b83\u80fd\u591f\u76f4\u63a5\u53bb\u8fd0\u884c\u4e00\u4e2a\u5355\u6587\u4ef6\u6e90\u7801！<\/p>\n

\u80fd\u591f\u7559\u610f\u5230\u7684\u662f, \u4f4d\u4e8e\u5b9e\u9645\u9879\u76ee\u91cc, \u5355\u72ec\u4e00\u4e2a\u4e0d\u4f9d\u9760\u7b2c\u4e09\u65b9\u5e93\u7684Java\u6e90\u7801\u662f\u6781\u4e3a\u5c11\u89c1\u7684, \u56e0\u800c, \u5728\u5927\u591a\u6570\u60c5\u5f62\u4e0b, \u6211\u4eec\u6ca1\u529e\u6cd5\u76f4\u63a5\u53bb\u8fd0\u884c\u4e00\u4efdJava\u6e90\u7801\u6587\u4ef6, \u7f18\u7531\u5728\u4e8e\u5b83\u9700\u8981\u4f9d\u8d56\u522b\u7684\u5e93\u3002<\/p>\n

\u5c0f\u7ed3<\/p>\n

\u4e00\u4e2aJava\u6e90\u7801, \u4ec5\u80fd\u591f\u5b9a\u4e49\u4e00\u79cd\u7c7b\u578b\u7684class, \u800c\u4e14class\u7684\u540d\u79f0\u4ee5\u53ca\u6587\u4ef6\u540d, \u5fc5\u987b\u8981\u505a\u5230\u5168\u7136\u4e00\u81f4\u3002<\/p>\n

\u501f\u52a9javac, \u80fd\u591f\u628a.java\u6e90\u7801\u7ed9\u4e88\u7f16\u8bd1\u6210.class\u5b57\u8282\u7801\u3002<\/p>\n

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