{"id":523867,"date":"2024-11-08T06:02:49","date_gmt":"2024-11-08T05:02:49","guid":{"rendered":"https:\/\/blog.jetbrains.com\/?post_type=idea&p=523867"},"modified":"2025-09-16T14:42:35","modified_gmt":"2025-09-16T13:42:35","slug":"java-23-and-intellij-idea","status":"publish","type":"idea","link":"https:\/\/blog.jetbrains.com\/zh-hans\/idea\/2024\/11\/java-23-and-intellij-idea\/","title":{"rendered":"Java 23 \u548c IntelliJ IDEA"},"content":{"rendered":"Java 23 \u5305\u542b\u5168\u65b0\u548c\u66f4\u65b0\u7684 Java \u8bed\u8a00\u529f\u80fd\u3001\u6838\u5fc3 API \u4ee5\u53ca JVM\uff0c\u540c\u65f6\u9002\u5408\u65b0\u7684 Java \u5f00\u53d1\u8005\u548c\u9ad8\u7ea7\u5f00\u53d1\u8005\u3002 IntelliJ IDEA 2024.2<\/a> \u73b0\u5df2\u652f\u6301 Java 23 \u529f\u80fd\u3002\n\n\u8ddf\u4e0a Java \u65b0\u7248\u672c\u7684\u53d1\u5e03\u8282\u594f\u53ef\u80fd\u5f88\u96be \u2013 \u66f4\u6539\u662f\u4ec0\u4e48\u3001\u4e3a\u4ec0\u4e48\u8981\u66f4\u6539\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5168\u65b0\u548c\u66f4\u65b0\u7684\u529f\u80fd\u3002 \u5728\u8fd9\u7bc7\u535a\u6587\u4e2d\uff0c\u6211\u5c06\u4ecb\u7ecd Java 23 \u7684\u4e00\u4e9b\u5168\u65b0\u548c\u66f4\u65b0\u529f\u80fd \u2013 \u5b83\u4eec\u4e3a\u60a8\u89e3\u51b3\u7684\u75db\u70b9\u3001\u8bed\u6cd5\u548c\u8bed\u4e49\uff0c\u4ee5\u53ca IntelliJ IDEA \u5982\u4f55\u5e2e\u52a9\u60a8\u4f7f\u7528\u5b83\u4eec\u3002\n\n\u6211\u5c06\u91cd\u70b9\u4ecb\u7ecd Java 23 \u529f\u80fd\uff0c\u4f8b\u5982\u5728\u6a21\u5f0f\u5339\u914d\u4e2d\u5305\u542b\u57fa\u5143\u6570\u636e\u7c7b\u578b<\/a>\u3001\u5728\u4ee3\u7801\u5e93\u4e2d\u5bfc\u5165\u6a21\u5757<\/a>\u7684\u80fd\u529b\u3001\u5728\u6587\u6863\u6ce8\u91ca\u4e2d\u4f7f\u7528 Markdown<\/a> \u7684\u53ef\u80fd\u6027\u3001\u9690\u5f0f\u58f0\u660e\u7684\u7c7b\u4e0e\u5b9e\u4f8b main \u65b9\u6cd5<\/a>\uff0c\u4ee5\u53ca\u7075\u6d3b\u7684\u6784\u9020\u51fd\u6570\u4f53<\/a>\u3002 \u5982\u679c\u60a8\u611f\u5174\u8da3\uff0c\u8bf7\u8bbf\u95ee\u6b64\u94fe\u63a5<\/a>\u6765\u67e5\u770b Java 23 \u5176\u4ed6\u529f\u80fd\u7684\u5217\u8868\u3002\n\n\u5728\u6df1\u5165\u4e86\u89e3 Java 23 \u529f\u80fd\u7684\u8be6\u7ec6\u4fe1\u606f\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u5feb\u901f\u914d\u7f6e IntelliJ IDEA\u3002\n

IntelliJ IDEA \u914d\u7f6e<\/h2>\n\u6700\u8fd1\u53d1\u5e03\u7684 IntelliJ IDEA 2024.2<\/a> \u5df2\u7ecf\u652f\u6301 Java 23\u3002\n\n\u5728\u60a8\u7684 Project Settings<\/em>\uff08\u9879\u76ee\u8bbe\u7f6e\uff09\u4e2d\uff0c\u5c06 SDK \u8bbe\u7f6e\u4e3a Java 23\u3002 \u60a8\u53ef\u4ee5\u5c06 IntelliJ IDEA \u914d\u7f6e\u4e3a\u4f7f\u7528\u4e0b\u8f7d\u7248\u672c\u7684 JDK 23\uff0c\u4e5f\u53ef\u4ee5\u9009\u62e9\u4ece\u4f9b\u5e94\u5546\u5217\u8868\u4e2d\u4e0b\u8f7d\u800c\u65e0\u9700\u9000\u51fa IDE\u3002 \u5bf9\u4e8e\u8bed\u8a00\u7ea7\u522b\uff0c\u9009\u62e9\u201c23(Preview) \u2013 Primitive types in patterns, implicitly declared classes, etc.\u201d\uff0823(\u9884\u89c8) \u2013 \u6a21\u5f0f\u4e2d\u7684\u57fa\u5143\u7c7b\u578b\uff0c\u9690\u5f0f\u58f0\u660e\u7684\u7c7b\u7b49\uff09\uff0c\u5982\u4e0b\u9762\u7684\u5c4f\u5e55\u622a\u56fe\u4e2d\u6240\u793a\uff1a\n
\"\"<\/figure>\n\u8981\u4f7f\u7528 Markdown \u6587\u6863\u6ce8\u91ca\u7b49\u6b63\u5f0f\u529f\u80fd\uff0c\u8bf7\u5c06\u8bed\u8a00\u7ea7\u522b\u66f4\u6539\u4e3a\u201c23 \u2013 Markdown documentation comments\u201d\uff0823 \u2013 Markdown \u6587\u6863\u6ce8\u91ca\uff09\uff0c\u5982\u4ee5\u4e0b\u8bbe\u7f6e\u5c4f\u5e55\u622a\u56fe\u4e2d\u6240\u793a\uff1a\n
\"\"<\/figure>\n\u5728\u638c\u63e1 IntelliJ IDEA \u7684\u914d\u7f6e\u540e\uff0c\u6211\u4eec\u6765\u6df1\u5165\u5b66\u4e60\u65b0\u529f\u80fd\u3002\n

\u6a21\u5f0f\u3001instanceof \u548c switch \u4e2d\u7684\u57fa\u5143\u7c7b\u578b\uff08\u9884\u89c8\u529f\u80fd\uff09<\/h2>\n\u60f3\u8c61\u4e00\u4e0b\uff0c\u60a8\u9700\u8981\u7f16\u5199\u4e00\u4e2a\u6761\u4ef6\u6784\u9020\uff0c\u5b83\u57fa\u4e8e long<\/code> \u53d8\u91cf\u7684\u503c\u662f\u5426\u5339\u914d\u51e0\u4e2a\u5b57\u9762\u91cf\u503c\u6216\u843d\u5728\u67d0\u4e2a\u503c\u8303\u56f4\u5185\u6765\u6267\u884c\u4ee3\u7801\u3002\n\n\u60a8\u4f1a\u600e\u4e48\u505a\uff1f \u5728\u6b64\u4e4b\u524d\uff0c\u60a8\u53ea\u80fd\u4f7f\u7528 if\/else \u6784\u9020\u6267\u884c\u6b64\u64cd\u4f5c\u3002 \u4f46\u662f\uff0c\u501f\u52a9 Java 23 \u4e2d\u7684\u6a21\u5f0f\u3001instanceof \u548c switch \u4e2d\u7684\u57fa\u5143\u7c7b\u578b<\/a>\uff08\u4e00\u79cd\u9884\u89c8\u8bed\u8a00\u529f\u80fd\uff09\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u66f4\u5177\u8868\u8fbe\u6027\u4e14\u6613\u4e8e\u9605\u8bfb\u7684 switch \u6784\u9020\u6765\u7f16\u5199\u6b64\u529f\u80fd\uff0c\u540c\u65f6\u5728 case \u6807\u7b7e\u4e2d\u4f7f\u7528 long \u503c\u3002\n

\u5c06\u57fa\u5143\u7c7b\u578b\u6dfb\u52a0\u5230\u6a21\u5f0f\u5339\u914d\u4e2d\u610f\u5473\u7740\u4ec0\u4e48\uff1f<\/h3>\n\u5728 Java 23 \u4e4b\u524d\uff0cswitch \u6784\u9020\uff08\u8bed\u53e5\u548c\u8868\u8fbe\u5f0f\uff09\u4ec5\u80fd\u5904\u7406\u5f15\u7528\u53d8\u91cf\u548c\u4e00\u4e9b\u57fa\u5143\u6570\u636e\u7c7b\u578b\uff0c\u4f8b\u5982 int<\/code>\u3001byte<\/code>\u3001short<\/code>\uff08\u6709\u7ea6\u675f\uff09\u3002 \u6b64\u5916\uff0cinstanceof<\/code> \u8fd0\u7b97\u7b26\u4e0d\u80fd\u7528\u4e8e\u4efb\u4f55\u57fa\u5143\u6570\u636e\u7c7b\u578b\u3002\n\n\u501f\u52a9 Java 23\uff0c\u60a8\u53ef\u4ee5\u5c06\u6240\u6709\u57fa\u5143\u6570\u636e\u7c7b\u578b\uff08\u5305\u62ec boolean<\/code>\u3001long<\/code>\u3001float<\/code> \u548c double<\/code><\/code>\uff09\u4e0e Switch \u6784\u9020\u4e2d\u7684\u6a21\u5f0f\u5339\u914d\u548c instanceof<\/code> \u8fd0\u7b97\u7b26\u4e00\u8d77\u4f7f\u7528\u3002 \u8fd9\u9002\u7528\u4e8e\u5728\u5d4c\u5957\u548c\u9876\u5c42\u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528\u3002\n\n\u4e3a\u4ec0\u4e48\u60a8\u5e94\u8be5\u5173\u6ce8\u6b64\u529f\u80fd\uff1f \u4e00\u9879\u529f\u80fd\u7684\u4ef7\u503c\u53d6\u51b3\u4e8e\u5b83\u5f71\u54cd\u7684\u4ee3\u7801\u5e93\u6709\u591a\u5927\u4ee5\u53ca\u4f7f\u7528\u9891\u7387\u3002 \u7531\u4e8e\u6761\u4ef6\u8bed\u53e5\u662f\u7f16\u7a0b\u7684\u57fa\u7840\u4e4b\u4e00\uff0c\u60a8\u53ef\u4ee5\u9884\u671f\u5728\u4ee3\u7801\u5e93\u4e2d\u5927\u91cf\u4f7f\u7528\u6b64\u529f\u80fd\u3002 \u5373\u4f7f\u60a8\u53ef\u80fd\u4e0d\u4f1a\u7f16\u5199\u4ee3\u7801\uff0c\u60a8\u4e5f\u4f1a\u9605\u8bfb\u7531\u5176\u4ed6\u4eba\u7f16\u5199\u7684\u4ee3\u7801\u3002\n\n\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u793a\u4f8b\u6765\u7406\u89e3\u6b64\u529f\u80fd\u3002\n

\u4e00\u4e2a\u793a\u4f8b\uff08\u5c06\u8f83\u957f\u7684 if-else \u8bed\u53e5\u66ff\u6362\u4e3a switch \u8868\u8fbe\u5f0f\uff09<\/h3>\n\u60f3\u8c61\u4e00\u4e2a\u65b9\u6cd5\uff0c\u4f8b\u5982 getHTTPCodeDesc(int)<\/code>\uff0c\u5b83\u63a5\u53d7 HTTP \u670d\u52a1\u5668\u4ee3\u7801\u4f5c\u4e3a int \u503c\uff0c\u5e76\u8fd4\u56de\u76f8\u5e94\u7684\u5b57\u7b26\u4e32\u8868\u793a\uff0c\u540c\u65f6\u5c06\u5176\u4e0e\u67d0\u4e2a\u5b57\u9762\u91cf\u503c\u6216\u503c\u8303\u56f4\u8fdb\u884c\u6bd4\u8f83\u3002\n\n\u8fd9\u6bb5\u4ee3\u7801\u4f3c\u4e4e\u6ca1\u6709\u660e\u663e\u7684\u95ee\u9898 \u2013 \u6211\u4eec\u90fd\u7f16\u5199\u8fc7\u6216\u9605\u8bfb\u8fc7\u7c7b\u4f3c\u7684\u4ee3\u7801\u3002 \u4e0d\u8fc7\uff0c\u5904\u7406 if-else \u6784\u9020\u7684\u6d41\u7a0b\u53ef\u80fd\u9700\u8981\u66f4\u957f\u7684\u65f6\u95f4\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u80fd\u5b9a\u4e49\u4e0d\u4ec5\u9650\u4e8e\u4e00\u4e2a\u53d8\u91cf\u7684\u590d\u6742\u6761\u4ef6\u3002 \u6211\u4eec\u7b80\u5355\u5730\u5047\u8bbe\u65b9\u6cd5 getHTTPCodeDesc()<\/code> \u7684\u5b9a\u4e49\u5982\u4e0b\uff1a\n
public String getHTTPCodeDesc(int code) {\n   if (code == 100) {\n       return "Continue";\n   } \n   else if (code == 200) {\n       return "OK";\n   } \n   else if (code == 301) {\n       return "Moved permanently";\n   } \n   else if (code == 302) {\n       return "Found";\n   } \n   else if (code == 400) {\n       return "Bad request";\n   } \n   else if (code == 500) {\n       return "Internal server error";\n   } \n   else if (code == 502) {\n       return "Bad gateway";\n   } \n   else if (code > 100 && code < 200) {\n       return "Informational";\n   } \n   else if (code > 200 && code < 300) {\n       return "Successful";\n   } \n   else if (code > 302 && code < 400) {\n       return "Redirection";\n   } \n   else if (code > 400 && code < 500) {\n       return "Client error";\n   } \n   else if (code > 502 && code < 600) {\n       return "Server error";\n   } \n   else {\n       return "Unknown error";\n   }\n}<\/pre>\n\u5728 Java 23 \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 switch \u8868\u8fbe\u5f0f\uff08\u4f7f\u7528\u57fa\u5143\u4f5c\u4e3a\u6a21\u5f0f\uff09\u66ff\u6362\u4e0a\u8ff0\u4ee3\u7801\uff0c\u5177\u4f53\u5982\u4e0b\u6240\u793a\uff1a\n
public String getHTTPCodeDesc(int code) {\n    return switch(code) {\n        case 100 -> "Continue";\n        case 200 -> "OK";\n        case 301 -> "Moved Permanently";\n        case 302 -> "Found";\n        case 400 -> "Bad Request";\n        case 500 -> "Internal Server Error";\n        case 502 -> "Bad Gateway";\n        case int i when i > 100 && i < 200 -> "Informational";\n        case int i when i > 200 && i < 300 -> "Successful";\n        case int i when i > 302 && i < 400 -> "Redirection";\n        case int i when i > 400 && i < 500 -> "Client Error";\n        case int i when i > 502 && i < 600 -> "Server Error";\n        default                            -> "Unknown error";\n    };\n}<\/pre>\n\u4e0a\u8ff0\u4ee3\u7801\u7684\u7b2c\u4e00\u4e2a\u660e\u663e\u597d\u5904\u662f\uff0c\u76f8\u6bd4\u4e8e\u4f7f\u7528 if-else \u8bed\u53e5\u7684\u7248\u672c\uff0c\u5b83\u66f4\u6613\u4e8e\u9605\u8bfb\u548c\u7406\u89e3\u3002 \u60a8\u53ef\u4ee5\u4e00\u76ee\u4e86\u7136\u5730\u7406\u89e3\u4ee3\u7801\u903b\u8f91\u3002\n\n\u53e6\u4e00\u4e2a\u4e0d\u90a3\u4e48\u660e\u663e\u7684\u597d\u5904\uff08\u4f46\u4e5f\u5f88\u91cd\u8981\uff09\u662f\u4e0a\u8ff0\u4ee3\u7801\u5982\u4f55\u51cf\u5c11\u60a8\u7684\u8ba4\u77e5\u8d1f\u62c5\u3002 \u8ba4\u77e5\u8d1f\u62c5\u6307\u7684\u662f\u60a8\u5728\u5de5\u4f5c\u8bb0\u5fc6\u4e2d\u62e5\u6709\u7684\u4fe1\u606f\u91cf\uff08\u5de5\u4f5c\u8bb0\u5fc6\u7a7a\u95f4\u6709\u9650\uff09\u3002 \u5982\u679c\u60a8\u8bd5\u56fe\u7528\u4e0e\u60a8\u7684\u6700\u7ec8\u76ee\u6807\u65e0\u76f4\u63a5\u5173\u8054\u7684\u6307\u4ee4\u6216\u4fe1\u606f\u6765\u4f7f\u60a8\u7684\u5de5\u4f5c\u8bb0\u5fc6\u8d85\u8f7d\uff0c\u90a3\u4e48\u60a8\u7684\u5de5\u4f5c\u6548\u7387\u4f1a\u964d\u4f4e\u3002 \u6613\u4e8e\u9605\u8bfb\u7684\u4ee3\u7801\u6bb5\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5c06\u6ce8\u610f\u529b\u96c6\u4e2d\u5230\u4ee3\u7801\u7684\u5176\u4ed6\u9886\u57df\u3002 \u5f53\u6211\u4eec\u63a2\u8ba8\u5982\u4f55\u7ecf\u5e38\u4ece\u4e2d\u53d7\u76ca\u65f6\uff0c\u8fd9\u4e9b\u5c0f\u7684\u80dc\u5229\u4f1a\u8d77\u5230\u5f88\u5927\u4f5c\u7528\u3002\n\n\u73b0\u5728\uff0c\u6211\u4eec\u6765\u804a\u804a\u7b80\u5355\u7684\u90e8\u5206\uff0c\u6211\u662f\u6307\u8bed\u6cd5\u3002 \u6b63\u5982\u60a8\u6240\u6ce8\u610f\u5230\u7684\uff0c\u5229\u7528\u5e26\u4fdd\u62a4\u7684 (when i > 100 && i < 200<\/code>) \u7c7b\u578b\u6a21\u5f0f (int i<\/code>)\uff0c\u5e26\u4fdd\u62a4\u7684 case \u6807\u7b7e\u65e2\u53ef\u4ee5\u6709\u5e38\u91cf\u503c\uff08\u4f8b\u5982 100\u3001200 \u7b49\uff09\uff0c\u4e5f\u53ef\u4ee5\u6709\u4f7f\u7528\u6a21\u5f0f\u5339\u914d\u6307\u5b9a\u7684\u503c\u8303\u56f4\u3002 \u60a8\u4e5f\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a default<\/code> \u5b50\u53e5\u3002\n\n\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u65b9\u6cd5 getHTTPCodeDesc()<\/code> \u4f7f\u7528 switch \u8868\u8fbe\u5f0f\u8fd4\u56de\u4e00\u4e2a\u503c\u3002 \u65e0\u8bba\u60a8\u4f20\u9012\u7ed9\u65b9\u6cd5\u5f62\u53c2\uff08\u5373 code<\/code>\uff09\u7684\u503c\u5982\u4f55\uff0c\u8be5\u65b9\u6cd5\u90fd\u5fc5\u987b\u8fd4\u56de\u4e00\u4e2a\u503c\u3002 \u6362\u53e5\u8bdd\u8bf4\uff0cswitch \u8868\u8fbe\u5f0f\u5fc5\u987b\u4e3a\u8be6\u5c3d\u3002 \u5982\u679c\u4e0d\u662f\uff0cIntelliJ IDEA \u53ef\u4ee5\u68c0\u6d4b\u5230\u5e76\u63d0\u4f9b\u6dfb\u52a0 default<\/code> \u5b50\u53e5\u7684\u9009\u9879\uff0c\u5982\u4ee5\u4e0b GIF \u4e2d\u6240\u793a\uff1a\n
\"\"<\/figure>\n\u4e0a\u8ff0\u4ee3\u7801\u5728 int \u7c7b\u578b\u7684\u53d8\u91cf\u4e0a\u8fdb\u884c\u5207\u6362\u3002 \u7c7b\u4f3c\u5730\uff0c\u60a8\u53ef\u4ee5\u5728\u6240\u6709\u5176\u4ed6\u57fa\u5143\u7c7b\u578b\uff08\u4f8b\u5982 long\u3001double\u3001float \u7b49\uff09\u7684\u53d8\u91cf\u4e0a\u5207\u6362\u3002\n
\u60a8\u662f\u7b2c\u4e00\u6b21\u4f7f\u7528\u6a21\u5f0f\u5339\u914d\u8fd8\u662f\u9996\u6b21\u4e86\u89e3 switch \u6784\u9020\u7684\u6700\u8fd1\u66f4\u6539\uff1f<\/h3>\n\u5982\u679c\u60a8\u5bf9\u6a21\u5f0f\u5339\u914d\u5b8c\u5168\u4e0d\u719f\u6089\uff0c\u8bf7\u67e5\u770b\u6211\u7684\u535a\u6587 Java 17 \u548c IntelliJ IDEA<\/a> \u4e2d\u5173\u4e8e\u57fa\u7840\u77e5\u8bc6<\/a>\u7684\u90e8\u5206\u3002 \u5982\u679c\u60a8\u5bf9\u5982\u4f55\u5c06\u6a21\u5f0f\u5339\u914d\u4e0e switch \u6784\u9020\u914d\u5408\u4f7f\u7528\u611f\u5174\u8da3\uff0c\u6211\u6709\u5173\u4e8e\u6b64\u4e3b\u9898\u7684\u53e6\u4e00\u7bc7\u8be6\u7ec6\u535a\u6587\uff1aEvolution of the Switch Construct in Java\u2014Why Should you Care?<\/a>\u3002\u8fd9\u7bc7\u6587\u7ae0\u4ecb\u7ecd\u4e86 switch \u6784\u9020\u5982\u4f55\u4f7f\u7528\u6a21\u5f0f\u5339\u914d\u6765\u68c0\u67e5\u5f15\u7528\u503c\u662f\u5426\u7b26\u5408\u4e0d\u540c\u6a21\u5f0f\uff0c\u5e76\u6839\u636e\u53d8\u91cf\u7684\u7c7b\u578b\u53ca\u5176\u7279\u6027\u6709\u6761\u4ef6\u5730\u6267\u884c\u4ee3\u7801\u3002\n
\u5c06\u6a21\u5f0f\u5339\u914d\u4e0e\u5e03\u5c14\u503c\u914d\u5408\u4f7f\u7528<\/h3>\n\u6211\u4eec\u7ecf\u5e38\u9605\u8bfb\u548c\u7f16\u5199\u6839\u636e boolean<\/code> \u53d8\u91cf\u7684\u503c\u662f true<\/code> \u8fd8\u662f false<\/code> \u6765\u8fd4\u56de\u503c\u7684\u4ee3\u7801\u3002 \u4f8b\u5982\uff0c\u5728\u4ee5\u4e0b\u4ee3\u7801\u4e2d\uff0c\u65b9\u6cd5 calculateDiscount<\/code> \u6839\u636e\u60a8\u4f20\u9012\u7ed9\u65b9\u6cd5\u5f62\u53c2 isPremiumMember<\/code> \u7684\u503c\u662f true<\/code> \u8fd8\u662f false<\/code> \u6765\u8ba1\u7b97\u5e76\u8fd4\u56de\u6298\u6263\u503c\uff1a\n
public class DiscountCalculator {\n    private static final int PREMIUM_DISCOUNT_PERCENTAGE = 20;\n    private static final int REGULAR_DISCOUNT_PERCENTAGE = 5;\n\n    public int calculateDiscount(boolean isPremiumMember, int totalAmount) {\n        int discount;\n        if (isPremiumMember) {\n            \/\/ Calculate discount for premium members\n            discount = (totalAmount * PREMIUM_DISCOUNT_PERCENTAGE) \/ 100;\n        } else {\n            \/\/ Calculate discount for regular members\n            discount = (totalAmount * REGULAR_DISCOUNT_PERCENTAGE) \/ 100;\n        }\n        return discount;\n    }\n}<\/pre>\n\u9664\u4e86 if-else \u6784\u9020\u5916\uff0c\u60a8\u8fd8\u53ef\u4ee5\u5207\u6362\u5e03\u5c14\u65b9\u6cd5\u5f62\u53c2 isPremiumMember<\/code> \u7684\u503c\uff0c\u800c\u65e0\u9700\u5b9a\u4e49\u5c40\u90e8\u53d8\u91cf discount<\/code>\uff0c\u5177\u4f53\u5982\u4e0b\u6240\u793a\uff1a\n
public int calculateDiscount(boolean isPremiumMember, int totalAmount) {\n    return switch (isPremiumMember) {\n        case true -> (totalAmount * PREMIUM_DISCOUNT_PERCENTAGE) \/ 100;\n        case false -> (totalAmount * REGULAR_DISCOUNT_PERCENTAGE) \/ 100;\n    };\n}<\/pre>\n\u7531\u4e8e\u65b9\u6cd5 calculateDiscount()<\/code> \u4e2d\u7684 switch \u8868\u8fbe\u5f0f\u4e3a\u8be6\u5c3d\uff0c\u5982\u679c\u60a8\u7f3a\u5c11 true \u6216 false \u503c\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\uff0cIntelliJ IDEA \u90fd\u53ef\u4ee5\u68c0\u6d4b\u5230\u5e76\u5efa\u8bae\u60a8\u63d2\u5165\u9ed8\u8ba4\u6216\u7f3a\u5c11\u7684 true\/false case\uff0c\u5982\u4ee5\u4e0b gif \u4e2d\u6240\u793a\uff1a\n
\"\"<\/figure>\n
\u5c06\u57fa\u5143\u7c7b\u578b\u4e0e instanceof \u8fd0\u7b97\u7b26\u914d\u5408\u4f7f\u7528<\/h3>\n\u5728 Java 23 \u4e4b\u524d\uff0c\u4efb\u4f55\u57fa\u5143\u7c7b\u578b\u90fd\u4e0d\u80fd\u4e0e instanceof \u8fd0\u7b97\u7b26\u7ed3\u5408\u4f7f\u7528\u3002\n\ninstanceof \u8fd0\u7b97\u7b26\u53ef\u7528\u4e8e\u68c0\u67e5\u53d8\u91cf\u7684\u7c7b\u578b\uff0c\u5e76\u6709\u6761\u4ef6\u5730\u6267\u884c\u4ee3\u7801\u3002 \u5229\u7528 instanceof \u7684\u6a21\u5f0f\u5339\u914d\uff0c\u5982\u679c\u5f85\u6bd4\u8f83\u53d8\u91cf\u7684\u7c7b\u578b\u4e0e\u7c7b\u578b\u6a21\u5f0f\u5339\u914d\uff0c\u60a8\u8fd8\u53ef\u4ee5\u58f0\u660e\u548c\u521d\u59cb\u5316\u6a21\u5f0f\u53d8\u91cf\uff0c\u800c\u65e0\u9700\u663e\u5f0f\u8f6c\u6362\u3002 instanceof \u53d8\u91cf\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4fdd\u62a4\u6a21\u5f0f\u3002\n\n\u968f\u7740\u5c06\u57fa\u5143\u7c7b\u578b\u6dfb\u52a0\u5230 instanceof \u8fd0\u7b97\u7b26\uff0c\u60a8\u53ef\u4ee5\u5b9a\u4e49\u5982\u4e0b\u4ee3\u7801\uff1a\n
import static java.io.IO.println;\n\nvoid main() {\n    var weight = 68;\n    if (weight instanceof byte byteWeight && byteWeight <= 70) {\n        println(\"Weight less than 70\");\n    }\n}<\/pre>\n\u8bf7\u6ce8\u610f\uff0cJava 23 \u4e2d\u7684\u201c\u9690\u5f0f\u58f0\u660e\u7684\u7c7b\u4e0e\u5b9e\u4f8b main \u65b9\u6cd5\u201d\u529f\u80fd\u5b9a\u4e49\u4e86\u5177\u6709 static \u65b9\u6cd5\u7684 java.io.IO<\/code>\uff0c\u5141\u8bb8\u60a8\u5bfc\u5165\u5e76\u4f7f\u7528 println()<\/code> \u5c06\u503c\u8f93\u51fa\u5230\u63a7\u5236\u53f0\uff0c\u800c\u4e0d\u662f\u4f7f\u7528 System.out.println()<\/code> \u6267\u884c\u6b64\u64cd\u4f5c\u3002\n\n\u5982\u679c\u60a8\u8ba1\u5212\u68c0\u67e5\u66f4\u591a\u7684\u7c7b\u578b\u548c\u6761\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5e26\u6709\u4fdd\u62a4\u7684 switch \u6784\u9020\uff0c\u5177\u4f53\u5982\u4e0b\u6240\u793a\uff1a\n
var weight = 68;\n\nswitch (weight) {\n    case byte b when b  println(\"byte: less than 70\");\n    case int i  when i  println(\"int: less than 7000\");\n    case long l when l >= 7_000 && l  println(\"long range: 7_000 - 70_000\");\n    case double d                               -> println(\"double\");\n}<\/pre>\n
\u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u7684\u5b89\u5168\u8f6c\u6362<\/h3>\n\u5f53\u60a8\u5c06\u6a21\u5f0f\u5339\u914d\u4e0e\u57fa\u5143\u6570\u636e\u7c7b\u578b\u914d\u5408\u4f7f\u7528\u65f6\uff0cJava \u7f16\u8bd1\u5668\u786e\u4fdd\u6ca1\u6709\u4fe1\u606f\u4e22\u5931\u3002 \u5728\u4ee5\u4e0b\u793a\u4f8b\u4e2d\uff0cinstanceof \u8fd0\u7b97\u7b26\u53ef\u4ee5\u5728\u68c0\u6d4b\u5230\u5b89\u5168\u65f6\u5728 double \u548c byte \u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u8f6c\u6362\uff1a\n
double height = 67;\n\nif (height instanceof byte byteHeight)\n    System.out.println(byteHeight);<\/pre>\n\u5982\u679c\u6ca1\u6709 instanceof \u8fd0\u7b97\u7b26\uff0c\u7c7b\u4f3c\u7684\u4ee3\u7801\u5c06\u65e0\u6cd5\u6267\u884c\u3002 \u4ee5\u4e0b\u4ee3\u7801\u4e0d\u4f1a\u7f16\u8bd1\uff1a\n
double height = 67;\n\nfinal byte convertToByte = height;<\/pre>\n
IntelliJ IDEA \u4e2d\u7684\u7a33\u5065\u6570\u636e\u6d41\u5206\u6790<\/h3>\nIntelliJ IDEA \u4e3a switch \u8bed\u53e5\u4e2d\u7684\u57fa\u5143\u7c7b\u578b\u63d0\u4f9b\u4e86\u6709\u529b\u652f\u6301\uff0c\u8fd8\u96c6\u6210\u4e86\u590d\u6742\u7684\u6570\u636e\u6d41\u5206\u6790\uff0c\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u907f\u514d\u5e38\u89c1\u95ee\u9898\u3002 \u5982\u4ee5\u4e0b\u793a\u4f8b\u4e2d\u6240\u793a\uff0cIntelliJ IDEA \u4e2d\u7684\u6570\u636e\u6d41\u5206\u6790\u53ef\u4ee5\u786e\u5b9a\u7b2c\u4e8c\u4e2a case \u6807\u7b7e\uff0c\u5373 case int _ \u548c\u5176\u4f59\u7684 case \u6807\u7b7e\u4e0d\u53ef\u8fbe\uff08\u56e0\u4e3a\u5982\u679c\u53d8\u91cf weight \u7684\u503c\u5927\u4e8e 70\uff0c\u4ee3\u7801\u4f1a\u9000\u51fa\u65b9\u6cd5\uff09\u3002 IntelliJ IDEA \u4f1a\u5c31\u4e0d\u53ef\u5230\u8fbe\u7684\u4ee3\u7801\u53d1\u51fa\u8b66\u544a\u5e76\u63d0\u4f9b\u9002\u5f53\u7684\u5efa\u8bae\uff1a\n
\"\"<\/figure>\n
\u8bb0\u5f55\u548c\u57fa\u5143\u6570\u636e\u7c7b\u578b\u7ec4\u4ef6<\/h3>\n\u60f3\u8c61\u4e00\u4e0b\uff0c\u60a8\u5b9a\u4e49\u4e86\u5982\u4e0b\u8bb0\u5f55 Person\uff1a\n
record Person(String name, double weight) {}<\/pre>\n\u5728\u6b64\u4e4b\u524d\uff0c\u60a8\u53ef\u4ee5\u5c06\u5176\u5206\u89e3\u4e3a\u7cbe\u786e\u7684\u6570\u636e\u7c7b\u578b\u3002 \u4e0d\u8fc7\uff0c\u501f\u52a9\u6a21\u5f0f\u5339\u914d\u4e2d\u7684\u57fa\u5143\u7c7b\u578b\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u517c\u5bb9\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4f8b\u5982 int\u3001long \u7b49\u3002 \u793a\u4f8b\u5982\u4e0b\uff1a\n
Person person = new Person(\"Java\", 672);\n\nswitch (person) {\n    case Person(String name, byte weight) -> println(\"byte:\" + weight);\n    case Person(String name, int weight) -> println(\"int:\"  + weight);\n    case Person(String name, double weight) -> println(\"double:\" + weight);\n    case Person(String name, long weight) -> println(\"long:\" + weight);\n    default -> throw new IllegalStateException(\"Unexpected value: \" + person);\n}<\/pre>\n\u60a8\u4e5f\u53ef\u4ee5\u5c06\u5b83\u4e0e instanceof \u8fd0\u7b97\u7b26\u914d\u5408\u4f7f\u7528\uff0c\u5177\u4f53\u5982\u4e0b\u6240\u793a\uff1a\n
 if (person instanceof Person(String name, byte weight)) {\n     System.out.println(\"Instanceof : \" + weight);\n }<\/pre>\n
IntelliJ IDEA \u652f\u6301\u6b64\u529f\u80fd\u7684\u540e\u7eed\u8ba1\u5212<\/h3>\n\u5bf9\u6a21\u5f0f\u5339\u914d\u4e2d\u57fa\u5143\u6570\u636e\u7c7b\u578b\u7684\u66f4\u591a\u652f\u6301\u6b63\u5728\u5f00\u53d1\uff0c\u5305\u62ec\u80fd\u591f\u5728\u6240\u6709\u57fa\u5143\u6570\u636e\u7c7b\u578b\u4e0a\u4f7f\u7528\u540e\u7f00\u8fd0\u7b97\u7b26 .switch \u6765\u5f00\u59cb\u7f16\u5199 switch \u6784\u9020\u3002 \u6b64\u5916\uff0c\u4e5f\u5728\u5f00\u53d1\u7684\u652f\u6301\u662f\u5c06\u73b0\u6709\u7684 if-else \u8bed\u53e5\u8f6c\u6362\u4e3a\u4f7f\u7528\u57fa\u5143\u6570\u636e\u7c7b\u578b\u7684 switch \u6784\u9020 \u2013 \u8fd9\u53ef\u8ba9\u60a8\u66f4\u8f7b\u677e\u5730\u91c7\u7528\u6b64\u65b0\u529f\u80fd\u3002\n
Markdown \u6587\u6863\u6ce8\u91ca\uff08\u6b63\u5f0f\u529f\u80fd\uff09<\/h2>\n\u5728\u6b64\u4e4b\u524d\uff0cJava \u6587\u6863\u6ce8\u91ca\u9700\u8981\u4f7f\u7528 HTML \u548c JavaDoc \u6807\u8bb0\u8fdb\u884c\u7f16\u5199\u3002 \u501f\u52a9\u6b64\u65b0\u529f\u80fd\uff0c\u5373\u6587\u6863\u6ce8\u91ca\uff0c\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528 Markdown \u7f16\u5199 JavaDoc \u6ce8\u91ca\u3002 \u8fd9\u662f Java 23 \u4e2d\u7684\u4e00\u9879\u6b63\u5f0f\u529f\u80fd\u3002\n\n\u60a8\u662f\u5426\u60f3\u77e5\u9053\u6b64\u66f4\u6539\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\n\n\u539f\u56e0\u4e4b\u4e00\u662f HTML \u4e0d\u518d\u662f\u65b0\u5f00\u53d1\u8005\u7684\u6d41\u884c\u9009\u62e9\uff08\u5c3d\u7ba1\u5728 Java \u4e8e 20 \u4e16\u7eaa 90 \u5e74\u4ee3\u540e\u671f\u63a8\u51fa\u65f6\uff0c\u5b83\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\uff09\u3002 \u624b\u52a8\u7f16\u5199 HTML \u5e76\u4e0d\u7b80\u5355\u3002 \u6b64\u5916\uff0cMarkdown \u66f4\u6613\u4e8e\u7f16\u5199\u3001\u9605\u8bfb\uff0c\u5e76\u4e14\u53ef\u4ee5\u8f7b\u677e\u8f6c\u6362\u4e3a HTML\u3002 \u8bb8\u591a\u5f00\u53d1\u8005\u90fd\u5728\u4f7f\u7528 Markdown \u6765\u8bb0\u5f55\u4ed6\u4eec\u7684\u4ee3\u7801\u3001\u64b0\u5199\u4e66\u7c4d\u3001\u6587\u7ae0\u3001\u535a\u6587\uff0c\u4ee5\u53ca\u751f\u6210\u7f51\u7ad9\u9875\u9762\u7b49\u3002\n\n\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u5728\u60a8\u7684\u6e90\u4ee3\u7801\u6587\u4ef6\u4e2d\u4f7f\u7528 Markdown \u7f16\u5199 Javadoc \u6ce8\u91ca\uff0c\u4ee5\u53ca IntelliJ IDEA \u5982\u4f55\u63d0\u4f9b\u5e2e\u52a9\u3002\n
\u4e00\u4e2a\u793a\u4f8b<\/h3>\nMarkdown \u6587\u6863\u6ce8\u91ca\u4ee5 \/\/\/ \u5f00\u5934\u3002\n\n\u4f7f\u7528\u4e09\u4e2a\u659c\u6760\u7684\u9009\u62e9\u975e\u5e38\u6709\u8da3\u3002 Oracle \u4e2d\u6b64\u529f\u80fd\u7684\u8d1f\u8d23\u4eba Jonathan Gibbons \u5206\u4eab\u8bf4\uff0c\u66f4\u6539 Java \u8bed\u8a00\u4e2d\u529f\u80fd\u7684\u8bed\u6cd5\u5e76\u975e\u6613\u4e8b\u3002 \u591a\u884c\u6ce8\u91ca\u4ee5 \/* \u5f00\u5934\uff0c\u4ee5 *\/ \u7ed3\u5c3e\u3002 \u8fd9\u6837\u4fbf\u5f88\u96be\u5728\u6587\u6863\u4e2d\u5305\u62ec\u53ef\u80fd\u5305\u542b *\/ \u7684\u4efb\u4f55\u4ee3\u7801\u3002 \u56e0\u6b64\uff0cMarkdown \u6587\u6863\u6ce8\u91ca\u4ee5 \/\/\/ \u5f00\u5934\u3002\n\n\u6b64\u5916\uff0c\u4e5f\u652f\u6301\u7f16\u5199\u6587\u6863\u6ce8\u91ca\u7684\u65e7\u65b9\u6cd5\uff0c\u5373 HTML \u548c JavaDoc \u6807\u8bb0\u3002 Jonathan \u8fd8\u63d0\u5230\uff0c\u65e0\u6cd5\u5c06 JavaDoc \u6807\u8bb0\u8f6c\u6362\u4e3a Markdown \u7b49\u6548\u6807\u8bb0\u3002 \u56e0\u6b64\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u4f7f\u7528 Markdown \u6ce8\u91ca\u548c JavaDoc \u6807\u8bb0\u7684\u7ec4\u5408\uff0c\u4ee5\u83b7\u5f97\u4e24\u5168\u5176\u7f8e\u7684\u7ed3\u679c\u3002\n\n\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528 Markdown \u548c Javadoc \u6807\u8bb0\u8bb0\u5f55\u65b9\u6cd5\u7684\u793a\u4f8b\uff1a\n
\/\/\/\n\/\/\/ **Getting started and having fun learning Java :)**\n\/\/\/\n\/\/\/ Prints a pattern of the letter 'P' using the specified character.\n\/\/\/\n\/\/\/ @param size the size of the pattern\n\/\/\/ @param charToPrint the character to use for the pattern\n\/\/\/\nprivate void printP(int size, char charToPrint) {\n    for (int i = 0; i < size; i++) {\n        for (int j = 0; j < size; j++) {\n            if (j == 0 || (i == 0 || i == size \/ 2) && j < size - 1 || (j == size - 1 && i <= size \/ 2)) {\n                System.out.print(charToPrint + \" \");\n            } else {\n                System.out.print(\"  \");\n            }\n        }\n        System.out.println();\n    }\n}<\/pre>\nIntelliJ IDEA \u53ef\u4ee5\u5e2e\u52a9\u60a8\u5728\u7f16\u8f91\u5668\u4e2d\u5207\u6362\u89c6\u56fe\uff0c\u67e5\u770b\u6587\u6863\u6ce8\u91ca\u5bf9\u4efb\u4f55\u9605\u8bfb Java \u6587\u6863\u6ce8\u91ca\u7684\u4eba\u5982\u4f55\u663e\u793a\u3002\n
\u5728 IntelliJ IDEA \u4e2d\u67e5\u770b Java \u6587\u6863\u6ce8\u91ca<\/h3>\nJEP\u201cMarkdown \u6587\u6863\u6ce8\u91ca\u201d\u7684\u8d1f\u8d23\u4eba Jonathan Gibbons \u5f3a\u8c03\uff0c\u6240\u6709\u5f00\u53d1\u8005\u90fd\u9700\u8981\u68c0\u67e5\u4ed6\u4eec\u6dfb\u52a0\u5230\u4ee3\u7801\u5e93\u4e2d\u7684 Java \u6587\u6863\u6ce8\u91ca\u662f\u5426\u6b63\u786e\u3002\n\nIntelliJ IDEA \u63d0\u4f9b\u4e86\u201c\u9605\u8bfb\u5668\u6a21\u5f0f\u201d\uff0c\u8ba9\u60a8\u80fd\u591f\u5728\u6e90\u4ee3\u7801\u4e2d\u67e5\u770b Java \u6587\u6863\u6ce8\u91ca\u3002 \u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528 Toggle Rendered View\uff08\u5207\u6362\u6e32\u67d3\u89c6\u56fe\uff09\u529f\u80fd\u5728 Java \u6587\u6863\u6ce8\u91ca\u4ee3\u7801\u548c\u67e5\u770b\u65b9\u5f0f\u4e4b\u95f4\u5207\u6362\uff0c\u5982\u4ee5\u4e0b gif \u4e2d\u6240\u793a\uff1a\n
\"\"<\/figure>\n
\u5728 IntelliJ IDEA \u4e2d\u7f16\u5199 Markdown \u6587\u6863\u6ce8\u91ca<\/h3>\nIntelliJ IDEA \u53ef\u4ee5\u68c0\u6d4b\u5230\u60a8\u6b63\u5728\u4f7f\u7528 Markdown \u8bb0\u5f55\u65b9\u6cd5\u3002 \u5f53\u60a8\u4ee5 \/\/\/ \u5f00\u59cb\u5e76\u6309 Enter \u65f6\uff0c\u5b83\u4e5f\u4f1a\u5728\u4e0b\u4e00\u884c\u6dfb\u52a0 \/\/\/\uff0c\u5982\u4ee5\u4e0b GIF \u4e2d\u6240\u793a\uff1a\n
\"\"<\/figure>\n
\u60a8\u662f\u5426\u5e94\u8be5\u5c06\u73b0\u6709\u7684\u6587\u6863\u6ce8\u91ca\u8f6c\u6362\u4e3a\u4f7f\u7528 Markdown\uff1f<\/h3>\n\u4e0b\u9762\u7684 gif \u663e\u793a\u4e86\u5728 IntelliJ IDEA \u4e2d\u4f7f\u7528 Markdown \u7f16\u5199\u7684 hashCode \u65b9\u6cd5\u7684\u6587\u6863\u3002 \u5229\u7528 Toggle Rendered View\uff08\u5207\u6362\u6e32\u67d3\u89c6\u56fe\uff09\uff0c\u60a8\u53ef\u4ee5\u8f7b\u677e\u5728\u9605\u8bfb\u5668\u89c6\u56fe\u4e2d\u67e5\u770b\u6587\u6863\uff0c\u8fd9\u66f4\u5bb9\u6613\u9605\u8bfb\u548c\u7406\u89e3\u3002\n
\"\"<\/figure>\n\u7406\u60f3\u60c5\u51b5\u4e0b\uff0c\u9664\u975e\u60a8\u7684\u5f00\u53d1\u8005\u6216 API \u7528\u6237\u5728\u4f7f\u7528\u4e0d\u63d0\u4f9b\u66ff\u4ee3\u89c6\u56fe\u7684\u5de5\u5177\uff08\u5982 IntelliJ IDEA\uff09\u67e5\u770b\u60a8\u7684\uff08API\u3001\u5e93\u3001\u6846\u67b6\uff09\u4ee3\u7801\u5e93\u65f6\u9047\u5230\u91cd\u5927\u53ef\u8bfb\u6027\u95ee\u9898\uff0c\u5426\u5219\u6211\u4e0d\u9f13\u52b1\u60a8\u5c06\u73b0\u6709\u6587\u6863\u8f6c\u6362\u4e3a\u4f7f\u7528 Markdown\u3002\n
\u6a21\u5757\u5bfc\u5165\u58f0\u660e\uff08\u9884\u89c8\u529f\u80fd\uff09<\/h1>\n\u501f\u52a9\u6b64\u529f\u80fd\uff0c\u60a8\u53ef\u4ee5\u5728\u7c7b\u6216\u63a5\u53e3\u4e2d\u4f7f\u7528\u5355\u6761\u8bed\u53e5\u5bfc\u5165\u6a21\u5757\u5e93\uff08\u5982 Java API\uff09\uff0c\u4f8b\u5982 import module java.base\uff0c\u8fd9\u6761\u8bed\u53e5\u5c06\u5bfc\u5165\u7531\u6a21\u5757 java.base \u5bfc\u51fa\u7684\u6240\u6709\u8f6f\u4ef6\u5305\u3002\n\n\u60a8\u4e0d\u9700\u8981\u5355\u72ec\u7684 import \u8bed\u53e5\u6765\u5bfc\u5165\u7c7b\u4e2d\u7684\u8f6f\u4ef6\u5305\uff0c\u5982 java.util\uff0c\u6216\u8005\u8bf4 java.io\uff0c\u56e0\u4e3a\u5b83\u4eec\u7531 java.base \u5bfc\u51fa\u3002\n
\u4e00\u4e2a\u793a\u4f8b<\/h3>\n\u4ee5\u4e0b\u4ee3\u7801\u793a\u4f8b\u4f7f\u7528\u4e86\u6765\u81ea java.io \u548c java.util \u8f6f\u4ef6\u5305\u7684\u7c7b\u3002 \u901a\u8fc7\u5305\u542b\u8bed\u53e5 ‘import java.base’\uff0c\u60a8\u4e0d\u9700\u8981\u5355\u72ec\u5bfc\u5165 java.io \u548c java.util \u8f6f\u4ef6\u5305\uff0c\u56e0\u4e3a\u5b83\u4eec\u7531\u6a21\u5757 java.base \u5bfc\u51fa\uff1a\n
import module java.base;\npublic class ImportModuleHelloWorld {\n\n    public static void main(String[] args) {\n\n        try {\n            InputStream inputStream = new BufferedInputStream(\n                                            new FileInputStream(\n                                                   new File(\"abc.txt\")));\n        } catch (FileNotFoundException e) {\n            throw new RuntimeException(e);\n        }\n\n        Map list = new HashMap();\n    }\n}<\/pre>\n\u4e0d\u8fc7\uff0c\u5982\u679c\u60a8\u4ece\u9876\u90e8\u5220\u9664 import module \u8bed\u53e5\uff0c\u5219 IntelliJ IDEA \u5c06\u4ece java.io \u548c java.util \u8f6f\u4ef6\u5305\u4e2d\u5bfc\u5165\u5355\u4e2a\u7c7b\u548c\u63a5\u53e3\u3002 \u6b64\u64cd\u4f5c\u5728\u4ee5\u4e0b GIF \u4e2d\u663e\u793a\uff1a\n
\"\"<\/figure>\n
\u54ea\u4e9b\u8f6f\u4ef6\u5305\u662f\u7531\u6a21\u5757 java.base\uff08\u6216\u5176\u4ed6\u6a21\u5757\uff09\u5bfc\u51fa\u7684\uff1f<\/h3>\n\u5f53\u60a8\u4f7f\u7528 IntelliJ IDEA \u65f6\uff0c\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\u5f88\u7b80\u5355\u3002 \u70b9\u51fb\u7f16\u8f91\u5668\u4e2d\u7684\u6a21\u5757\u540d\u79f0\u6216\u4f7f\u7528\u76f8\u5173\u5feb\u6377\u952e\uff08Go to Declaration\uff08\u8f6c\u5230\u58f0\u660e\uff09 \u6216 Go to Usages\uff08\u8f6c\u5230\u7528\u6cd5\uff09\uff09\uff0c\u60a8\u53ef\u4ee5\u67e5\u770b\u6b64\u6a21\u5757\u7684\u5b9a\u4e49\u4ee5\u627e\u51fa\u7531\u6b64\u6a21\u5757\u5bfc\u51fa\u7684\u6240\u6709\u6a21\u5757\u3002 \u6b64\u64cd\u4f5c\u5728\u4ee5\u4e0b gif \u4e2d\u663e\u793a\uff1a\n
\"\"<\/figure>\n
\u9690\u5f0f\u58f0\u660e\u7684\u7c7b\u4e0e\u5b9e\u4f8b main \u65b9\u6cd5\uff08\u7b2c\u4e09\u9884\u89c8\u7248\uff09<\/h2>\n\u6b64\u529f\u80fd<\/a>\u5728 Java 21 \u4e2d\u4f5c\u4e3a\u9884\u89c8\u8bed\u8a00\u529f\u80fd\u5f15\u5165\uff0c\u5728 Java 23 \u4e2d\u4e3a\u7b2c\u4e09\u4e2a\u9884\u89c8\u7248\u3002\n\n\u5b83\u5c06\u6539\u53d8\u65b0 Java \u5f00\u53d1\u8005\u5b66\u4e60 Java \u7684\u65b9\u5f0f\u3002 \u5b83\u7b80\u5316\u4e86\u5b66\u751f\u5b66\u4e60\u57fa\u7840\u77e5\u8bc6\uff08\u4f8b\u5982\u53d8\u91cf\u8d4b\u503c\u3001\u5e8f\u5217\u3001\u6761\u4ef6\u548c\u8fed\u4ee3\uff09\u65f6\u7684\u521d\u59cb\u6b65\u9aa4\u3002 \u5b66\u751f\u4e0d\u518d\u9700\u8981\u58f0\u660e\u663e\u5f0f\u7c7b\u6765\u5f00\u53d1\u4ee3\u7801\uff0c\u6216\u4f7f\u7528\u6b64\u7b7e\u540d\u7f16\u5199\u5176 main() \u65b9\u6cd5 public static void main(String [])\u3002 \u501f\u52a9\u6b64\u529f\u80fd\uff0c\u53ef\u4ee5\u9690\u5f0f\u58f0\u660e\u7c7b\uff0c\u4ee5\u53ca\u4f7f\u7528\u66f4\u77ed\u7684\u5173\u952e\u5b57\u5217\u8868\u521b\u5efa main() \u65b9\u6cd5\u3002\n\n\u5982\u679c\u60a8\u4e0d\u719f\u6089\u6b64\u529f\u80fd\uff0c\u6211\u5f3a\u70c8\u5efa\u8bae\u9605\u8bfb\u8be6\u7ec6\u4ecb\u7ecd\u6b64\u529f\u80fd\u7684\u6587\u7ae0 \u2018HelloWorld\u2019 and \u2018main()\u2019 meet minimalistic<\/a>\u3002 \u5728\u672c\u8282\u4e2d\uff0c\u6211\u5c06\u5305\u62ec Java 23 \u4e2d\u5bf9\u6b64\u529f\u80fd\u7684\u8865\u5145\u3002\n
\u4f7f\u7528\u6a21\u5757 java.base \u5bfc\u51fa\u7684\u8f6f\u4ef6\u5305\u800c\u4e0d\u663e\u5f0f\u5bfc\u5165\u5b83\u4eec<\/h3>\n\u53ea\u9700\u5728\u9690\u5f0f\u7c7b\u7684\u9876\u90e8\u5305\u542b\u4e00\u6761 import \u8bed\u53e5\uff0c\u5373 import module java.base\uff0c\u60a8\u5c31\u80fd\u81ea\u52a8\u5bfc\u5165 java.base \u5bfc\u51fa\u7684\u8f6f\u4ef6\u5305\u3002 \u8fd9\u610f\u5473\u7740\u60a8\u7684\u9690\u5f0f\u7c7b\u5c06\u4e0d\u518d\u9700\u8981\u8fd9\u4e9b\u7c7b\u6216\u8f6f\u4ef6\u5305\u7684\u5355\u72ec import \u8bed\u53e5\uff0c\u5982\u4ee5\u4e0b gif \u4e2d\u6240\u793a\uff1a\n
\"\"<\/figure>\n
\u7b80\u5316\u4e0e\u63a7\u5236\u53f0\u4ea4\u4e92\u7684\u4ee3\u7801\u7684\u7f16\u5199<\/h3>\n\u4e0e\u63a7\u5236\u53f0\u4ea4\u4e92 \u2013 \u6253\u5370\u6d88\u606f\u6216\u4f7f\u7528\u6d88\u606f\u662f\u65b0 Java \u5f00\u53d1\u8005\u7ecf\u5e38\u4f7f\u7528\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002 \u5728\u6b64\u529f\u80fd\u4e2d\uff0c\u8fd9\u4e00\u70b9\u5f97\u5230\u4e86\u8fdb\u4e00\u6b65\u7b80\u5316\u3002\n\n\u60a8\u7684\u9690\u5f0f\u58f0\u660e\u7684\u7c7b\u53ef\u4ee5\u4f7f\u7528\u65b9\u6cd5 println() \u548c print() \u5c06\u6d88\u606f\u8f93\u51fa\u5230\u63a7\u5236\u53f0\uff0c\u5e76\u4f7f\u7528\u65b9\u6cd5 readln() \u8bfb\u53d6\u5b57\u7b26\u4e32\u6d88\u606f\uff0c\u800c\u65e0\u9700\u5728\u60a8\u7684\u7c7b\u4e2d\u663e\u5f0f\u5bfc\u5165\u5b83\u4eec\u3002 \u6240\u6709\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u5728\u4e00\u4e2a\u7531\u9690\u5f0f\u7c7b\u9690\u5f0f\u5bfc\u5165\u7684\u65b0\u9876\u5c42\u7c7b java.io.IO<\/a> \u4e2d\u58f0\u660e\u3002\n\n\u82b1\u70b9\u65f6\u95f4\uff0c\u770b\u770b\u60a8\u9700\u8981\u5982\u4f55\u5728\u5e38\u89c4\u7c7b\u4e2d\u663e\u5f0f\u5bfc\u5165\u5b83\u4eec\uff0c\u5982\u4ee5\u4e0b GIF \u4e2d\u6240\u793a\uff1a\n\n\n\n\u4ee5\u4e0b gif \u663e\u793a\u4e86\u5f53\u60a8\u5728\u9690\u5f0f\u7c7b\u4e2d\u4f7f\u7528\u524d\u8ff0\u76f8\u540c\u65b9\u6cd5\u65f6\u4e0d\u9700\u8981\u663e\u5f0f\u5bfc\u5165\uff1a\n\n\n
\u7075\u6d3b\u7684\u6784\u9020\u51fd\u6570\u4f53\uff08\u7b2c\u4e8c\u9884\u89c8\u7248\uff09<\/h1>\n\u8fd9\u662f JDK 22 \u4e2d\u4e00\u9879\u529f\u80fd\u7684\u7b2c\u4e8c\u9884\u89c8\u7248\uff0c\u4e4b\u524d\u79f0\u4e3a\u201csuper() \u4e4b\u524d\u7684\u8bed\u53e5\u201d\u3002 \u9664\u4e86\u529f\u80fd\u540d\u79f0\u7684\u66f4\u6539\u5916\uff0c\u8fd9\u9879\u529f\u80fd\u8fd8\u6709\u4e00\u4e2a\u91cd\u8981\u53d8\u5316\u3002 \u73b0\u5728\uff0c\u53ef\u4ee5\u5728\u8c03\u7528 super() \u6216 this() \u4e4b\u524d\u521d\u59cb\u5316\u5b57\u6bb5\u3002\n\n\u5f53\u8d85\u7c7b\u4ece\u5176\u6784\u9020\u51fd\u6570\u4e2d\u8c03\u7528\u65b9\u6cd5\uff0c\u800c\u60a8\u60f3\u8981\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\u6b64\u65b9\u6cd5\u5e76\u5728\u6b64\u65b9\u6cd5\u5185\u90e8\u8bbf\u95ee\u5b50\u7c7b\u4e2d\u7684\u5b57\u6bb5\u65f6\uff0c\u8fd9\u975e\u5e38\u6709\u7528\u3002 \u6b64\u524d\uff0c\u4ece\u8d85\u7c7b\u6784\u9020\u51fd\u6570\u4e2d\u8c03\u7528\u65b9\u6cd5\u65f6\uff0c\u5b50\u7c7b\u5b57\u6bb5\u4e0d\u4f1a\u521d\u59cb\u5316\u3002 \u73b0\u5728\uff0c\u53ef\u4ee5\u521d\u59cb\u5316\u5b57\u6bb5\u5e76\u9632\u6b62\u610f\u5916\u3002 \u4e0b\u9762\u662f\u5c55\u793a\u6b64\u529f\u80fd\u7684\u793a\u4f8b\u4ee3\u7801\uff1a\n
abstract class Action {\n    public Action() {\n        System.out.println(\"performing \" + getText());\n    }\n    public abstract String getText();\n}\n\nclass DoubleAction extends Action {\n    private final String text;\n    private DoubleAction(String text) {\n        this.text = text; \/\/ this did not compile before Java 23 with preview features enabled.\n        super();\n    }\n\n    @Override public String getText() {\n        return text + text;\n    }\n}<\/pre>\n\u5982\u679c\u60a8\u4e0d\u719f\u6089\u6b64\u529f\u80fd\uff0c\u656c\u8bf7\u9605\u8bfb\u8be6\u7ec6\u4ecb\u7ecd\u6b64\u529f\u80fd\u7684\u535a\u6587 https:\/\/blog.jetbrains.com\/idea\/2024\/02\/constructor-makeover-in-java-22\/<\/a>\uff0c\u5176\u4e2d\u63a2\u8ba8\u4e86\u6b64\u529f\u80fd\u7684\u4f7f\u7528\u539f\u56e0\u548c\u4f7f\u7528\u65b9\u5f0f\u3002\n
\u9884\u89c8\u529f\u80fd<\/h2>\n\n\n\n\n\u5728\u8fd9\u7bc7\u535a\u6587\u4e2d\u4ecb\u7ecd\u7684\u529f\u80fd\u4e2d\uff0c\u201c\u6a21\u5f0f\u3001instanceof \u548c switch \u4e2d\u7684\u57fa\u5143\u7c7b\u578b\u201d\u3001\u201c\u6a21\u5757\u5bfc\u5165\u58f0\u660e\u201d\u3001\u201c\u9690\u5f0f\u58f0\u660e\u7684\u7c7b\u548c\u5b9e\u4f8b main \u65b9\u6cd5\u201d\u548c\u201c\u7075\u6d3b\u7684\u6784\u9020\u51fd\u6570\u4f53\u201d\u5728 Java 23 \u4e2d\u662f\u9884\u89c8\u8bed\u8a00\u529f\u80fd\u3002 Java \u7684\u65b0\u53d1\u5e03\u5468\u671f\u4e3a\u516d\u4e2a\u6708\uff0c\u65b0\u8bed\u8a00\u529f\u80fd\u4f5c\u4e3a\u9884\u89c8\u529f\u80fd\u53d1\u5e03\u3002 \u5b83\u4eec\u53ef\u80fd\u4f1a\u5728\u540e\u7eed Java \u7248\u672c\u7684\u7b2c\u4e8c\u4e2a\u6216\u5176\u4ed6\u9884\u89c8\u7248\u4e2d\u91cd\u65b0\u5f15\u5165\uff0c\u53ef\u80fd\u6709\u4e5f\u53ef\u80fd\u6ca1\u6709\u66f4\u6539\u3002 \u8db3\u591f\u7a33\u5b9a\u540e\uff0c\u5b83\u4eec\u5c31\u4f1a\u4f5c\u4e3a\u6807\u51c6\u8bed\u8a00\u529f\u80fd\u6dfb\u52a0\u5230 Java \u4e2d\u3002\n\n\n\n\n\n\u9884\u89c8\u8bed\u8a00\u529f\u80fd\u662f\u5b8c\u6574\u7684\u4f46\u4e0d\u662f\u6c38\u4e45\u7684\uff0c\u8fd9\u5b9e\u9645\u4e0a\u610f\u5473\u7740\u529f\u80fd\u5df2\u7ecf\u51c6\u5907\u597d\u4f9b\u5f00\u53d1\u8005\u4f7f\u7528\uff0c\u53ea\u662f\u66f4\u7ec6\u81f4\u7684\u7ec6\u8282\u53ef\u80fd\u4f1a\u5728\u672a\u6765\u7684 Java \u7248\u672c\u4e2d\u6839\u636e\u5f00\u53d1\u8005\u53cd\u9988\u53d1\u751f\u53d8\u5316\u3002 \u4e0e API \u4e0d\u540c\uff0c\u8bed\u8a00\u529f\u80fd\u5728\u672a\u6765\u4e0d\u80fd\u88ab\u5f03\u7528\u3002 \u56e0\u6b64\uff0c\u5982\u679c\u60a8\u5bf9\u9884\u89c8\u8bed\u8a00\u529f\u80fd\u6709\u4efb\u4f55\u53cd\u9988\uff0c\u8bf7\u968f\u65f6\u5728 JDK \u90ae\u4ef6\u540d\u5355\uff08\u9700\u8981\u514d\u8d39\u6ce8\u518c\uff09\u4e2d\u5206\u4eab\u3002\n\n\n\n\n\n\u7531\u4e8e\u8fd9\u4e9b\u529f\u80fd\u7684\u8fd0\u4f5c\u65b9\u5f0f\uff0cIntelliJ IDEA \u4ec5\u652f\u6301\u5f53\u524d JDK \u7684\u9884\u89c8\u529f\u80fd\u3002 \u9884\u89c8\u8bed\u8a00\u529f\u80fd\u5728\u4e0d\u540c Java \u7248\u672c\u95f4\u53ef\u80fd\u53d1\u751f\u53d8\u5316\uff0c\u76f4\u5230\u5b83\u4eec\u88ab\u79fb\u9664\u6216\u6dfb\u52a0\u4e3a\u6807\u51c6\u8bed\u8a00\u529f\u80fd\u3002 \u4f7f\u7528\u65e7\u7248\u672c Java SE Platform \u4e2d\u7684\u9884\u89c8\u8bed\u8a00\u529f\u80fd\u7684\u4ee3\u7801\u53ef\u80fd\u65e0\u6cd5\u5728\u65b0\u7248\u672c\u4e0a\u7f16\u8bd1\u6216\u8fd0\u884c\u3002\n
\u603b\u7ed3<\/h2>\n\u5728\u8fd9\u7bc7\u535a\u6587\u4e2d\uff0c\u6211\u4ecb\u7ecd\u4e86\u4e94\u4e2a Java 23 \u529f\u80fd \u2013 \u6a21\u5f0f\u3001instanceof \u548c switch \u4e2d\u7684\u57fa\u5143\u7c7b\u578b<\/a>\u3001Markdown \u6587\u6863\u6ce8\u91ca<\/a>\u3001\u6a21\u5757\u5bfc\u5165\u58f0\u660e<\/a>\u3001\u9690\u5f0f\u58f0\u660e\u7684\u7c7b\u4e0e\u5b9e\u4f8b main \u65b9\u6cd5<\/a>\uff0c\u4ee5\u53ca\u7075\u6d3b\u7684\u6784\u9020\u51fd\u6570\u4f53<\/a>\u3002\n\n\u67e5\u770b\u8fd9\u4e9b\u65b0\u529f\u80fd\uff0c\u4e86\u89e3\u5b83\u4eec\u5982\u4f55\u5e2e\u52a9\u60a8\u6539\u8fdb\u5e94\u7528\u7a0b\u5e8f\u3002\n\n\u5feb\u4e50\u7f16\u7a0b\uff01\n\n\n\n\n\n\n\n\u672c\u535a\u6587\u82f1\u6587\u539f\u4f5c\u8005\uff1a\n\n\n\n","protected":false},"author":1297,"featured_media":510392,"comment_status":"closed","ping_status":"closed","template":"","categories":[4759,5088],"tags":[3374,155,8568,76,8582],"cross-post-tag":[],"acf":[],"_links":{"self":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/idea\/523867"}],"collection":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/idea"}],"about":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/types\/idea"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/users\/1297"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/comments?post=523867"}],"version-history":[{"count":10,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/idea\/523867\/revisions"}],"predecessor-version":[{"id":609609,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/idea\/523867\/revisions\/609609"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/media\/510392"}],"wp:attachment":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/media?parent=523867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/categories?post=523867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/tags?post=523867"},{"taxonomy":"cross-post-tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/cross-post-tag?post=523867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}