{"id":15639,"date":"2024-07-08T19:41:35","date_gmt":"2024-07-08T11:41:35","guid":{"rendered":"https:\/\/92it.top\/?p=15639"},"modified":"2024-07-08T19:41:35","modified_gmt":"2024-07-08T11:41:35","slug":"%e6%89%9b%e4%b8%8d%e4%bd%8f%e8%af%b1%e6%83%91%ef%bc%8c%e6%88%91%e5%87%86%e5%a4%87%e8%bd%ac%e6%8a%95-jdk17-%e4%ba%86","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=15639","title":{"rendered":"\u625b\u4e0d\u4f4f\u8bf1\u60d1\uff0c\u6211\u51c6\u5907\u8f6c\u6295 JDK17 \u4e86…."},"content":{"rendered":"\n

JDK\u7248\u672c\u5347\u7ea7\u7684\u975e\u5e38\u5feb\uff0c\u73b0\u5728\u5df2\u7ecf\u5230JDK20\u4e86\u3002JDK\u7248\u672c\u867d\u591a\uff0c\u4f46\u5e94\u7528\u6700\u5e7f\u6cdb\u7684\u8fd8\u5f97\u662fJDK8\uff0c\u6b63\u6240\u8c13\u201c\u4ed6\u53d1\u4efb\u4ed6\u53d1\uff0c\u6211\u7528Java8\u201d\u3002<\/p>\n\n\n\n

\u5176\u5b9e\u6211\u4e5f\u4e0d\u592a\u60f3\u5347\u7ea7JDK\u7248\u672c\uff0c\u611f\u89c9\u6295\u5165\u9ad8\uff0c\u6536\u76ca\u5c0f\uff0c\u4e0d\u8fc7\u6709\u4e00\u6b21\u6211\u770b\u5230\u4e86\u4e00\u4e9b\u4f7f\u7528JDK17\u65b0\u8bed\u6cd5\u5199\u7684\u4ee3\u7801\uff0c\u8ba9\u6211\u6539\u53d8\u4e86\u5bf9\u5347\u7ea7JDK\u7684\u770b\u6cd5\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u65b0\u8bed\u6cd5\u6211\u786e\u5b9e\u60f3\u7528\uff01<\/p>\n\n\n\n

\u5e9f\u8bdd\u4e0d\u591a\u8bf4\uff0c\u4e0a\u4ee3\u7801\uff01<\/p>\n\n\n\n

\u4e00\u3001JDK17\u8bed\u6cd5\u65b0\u7279\u6027<\/strong><\/p>\n\n\n\n

\n\n\n\n

1. \u6587\u672c\u5757<\/strong><\/p>\n\n\n\n

\u8fd9\u4e2a\u66f4\u65b0\u975e\u5e38\u5b9e\u7528\u3002\u5728\u6ca1\u6709\u8fd9\u4e2a\u7279\u6027\u4e4b\u524d\uff0c\u7f16\u5199\u957f\u6587\u672c\u975e\u5e38\u75db\u82e6\u3002\u867d\u7136IDEA\u7b49\u96c6\u6210\u5f00\u53d1\u5de5\u5177\u53ef\u4ee5\u81ea\u52a8\u5904\u7406\uff0c\u4f46\u6700\u7ec8\u6548\u679c\u4ecd\u7136\u4e11\u964b\uff0c\u5145\u6ee1\u62fc\u63a5\u7b26\u53f7\u3002\u73b0\u5728\uff0c\u901a\u8fc7\u5b57\u7b26\u4e32\u5757\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u7f16\u5199JSON\u3001HTML\u3001SQL\u7b49\u5185\u5bb9\uff0c\u6548\u679c\u66f4\u6e05\u723d\u3002<\/p>\n\n\n\n

\u8fd9\u4e2a\u65b0\u7279\u6027\u503c\u5f97\u4e94\u9897\u661f\u8bc4\u4ef7\uff0c\u56e0\u4e3a\u5b83\u8ba9\u6211\u4eec\u53ea\u9700\u5173\u6ce8\u5b57\u7b26\u4e32\u672c\u8eab\uff0c\u800c\u65e0\u9700\u5173\u5fc3\u62fc\u63a5\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\u539f\u6765\u7684\u5199\u6cd5<\/p>\n\n\n\n

\/**\n * \u4f7f\u7528JDK8\u8fd4\u56deHTML\u6587\u672c\n *\n * @return \u8fd4\u56deHTML\u6587\u672c\n *\/\npublic static final String getHtmlJDK8() {\n    return \"<html>\\n\" +\n        \" <body>\\n\" +\n        \" <p>Hello, world<\/p>\\n\" +\n        \" <\/body>\\n\" +\n        \"<\/html>\";\n}<\/pre>\n\n\n\n
\u65b0\u7684\u5199\u6cd5<\/p>\n\n\n\n
\/**\n * \u4f7f\u7528JDK17\u8fd4\u56deHTML\u6587\u672c\n *\n * @return \u8fd4\u56deHTML\u6587\u672c\n *\/\npublic static final String getHtmlJDK17() {\n    return \"\"\"\n        <html>\n            <body>\n                <p>Hello, world<\/p>\n            <\/body>\n        <\/html>\n        \"\"\";\n}<\/pre>\n\n\n\n
2. NullPointerException\u589e\u5f3a<\/strong><\/p>\n\n\n\n
\u8fd9\u4e00\u529f\u80fd\u975e\u5e38\u5f3a\u5927\u4e14\u5b9e\u7528\uff0c\u76f8\u4fe1\u6bcf\u4f4dJava\u5f00\u53d1\u8005\u90fd\u671f\u5f85\u5df2\u4e45\u3002\u7a7a\u6307\u9488\u5f02\u5e38\uff08NPE\uff09\u4e00\u76f4\u662fJava\u7a0b\u5e8f\u5458\u7684\u75db\u70b9\uff0c\u56e0\u4e3a\u62a5\u9519\u4fe1\u606f\u65e0\u6cd5\u76f4\u89c2\u5730\u6307\u51fa\u54ea\u4e2a\u5bf9\u8c61\u4e3a\u7a7a\uff0c\u53ea\u629b\u51fa\u4e00\u4e2aNullPointerException\u548c\u4e00\u5806\u5806\u6808\u4fe1\u606f\uff0c\u5b9a\u4f4d\u95ee\u9898\u8017\u65f6\u4e14\u9ebb\u70e6\u3002<\/p>\n\n\n\n
\u5c24\u5176\u5728\u9047\u5230\u559c\u6b22\u7ea7\u8054\u8c03\u7528\u7684\u4ee3\u7801\u65f6\uff0c\u9010\u884c\u6392\u67e5\u66f4\u662f\u4ee4\u4eba\u5934\u75bc\u3002\u5982\u679c\u5728\u6d4b\u8bd5\u73af\u5883\u4e2d\uff0c\u53ef\u80fd\u8fd8\u9700\u901a\u8fc7\u8fdc\u7a0b\u8c03\u8bd5\u67e5\u660e\u7a7a\u5bf9\u8c61\uff0c\u8d39\u65f6\u8d39\u529b\u3002\u4e3a\u6b64\uff0c\u963f\u91cc\u7684\u7f16\u7801\u89c4\u8303\u751a\u81f3\u4e0d\u5141\u8bb8\u7ea7\u8054\u8c03\u7528\uff0c\u4f46\u8fd9\u5e76\u4e0d\u80fd\u5f7b\u5e95\u89e3\u51b3\u95ee\u9898\u3002Java17\u7ec8\u4e8e\u5728\u8fd9\u65b9\u9762\u53d6\u5f97\u4e86\u7a81\u7834\uff0c\u63d0\u4f9b\u4e86\u66f4\u8be6\u7ec6\u7684\u7a7a\u6307\u9488\u5f02\u5e38\u4fe1\u606f\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u8fc5\u901f\u5b9a\u4f4d\u95ee\u9898\u6e90\u5934\u3002<\/p>\n\n\n\n
public static void main(String[] args) {\n    try {\n        \/\/\u7b80\u5355\u7684\u7a7a\u6307\u9488\n        String str = null;\n        str.length();\n    } catch (Exception e) {\n        e.printStackTrace();\n    }\n    try {\n        \/\/\u590d\u6742\u4e00\u70b9\u7684\u7a7a\u6307\u9488\n        var arr = List.of(null);\n        String str = (String)arr.get(0);\n        str.length();\n    } catch (Exception e) {\n        e.printStackTrace();\n    }\n}<\/pre>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c<\/p>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n
3. Records<\/strong><\/p>\n\n\n\n
\u5728Java\u4e2d\uff0cPOJO\u5bf9\u8c61\uff08\u5982DO\u3001PO\u3001VO\u3001DTO\u7b49\uff09\u901a\u5e38\u5305\u542b\u6210\u5458\u53d8\u91cf\u53ca\u76f8\u5e94\u7684Getter\u548cSetter\u65b9\u6cd5\u3002\u5c3d\u7ba1\u53ef\u4ee5\u901a\u8fc7\u5de5\u5177\u6216IDE\u751f\u6210\u8fd9\u4e9b\u4ee3\u7801\uff0c\u4f46\u4fee\u6539\u548c\u7ef4\u62a4\u4ecd\u7136\u9ebb\u70e6\u3002Lombok\u63d2\u4ef6\u4e3a\u6b64\u51fa\u73b0\uff0c\u80fd\u591f\u5728\u7f16\u8bd1\u671f\u95f4\u81ea\u52a8\u751f\u6210Getter\u3001Setter\u3001hashcode\u3001equals\u548c\u6784\u9020\u51fd\u6570\u7b49\u4ee3\u7801\uff0c\u4f7f\u7528\u8d77\u6765\u65b9\u4fbf\uff0c\u4f46\u5bf9\u56e2\u961f\u6709\u4f9d\u8d56\u8981\u6c42\u3002<\/p>\n\n\n\n
\u4e3a\u6b64\uff0cJava\u5f15\u5165\u4e86\u6807\u51c6\u89e3\u51b3\u65b9\u6848\uff1aRecords\u3002\u5b83\u901a\u8fc7\u7b80\u6d01\u7684\u8bed\u6cd5\u5b9a\u4e49\u6570\u636e\u7c7b\uff0c\u5927\u5927\u7b80\u5316\u4e86POJO\u7c7b\u7684\u7f16\u5199\uff0c\u5982\u4e0b\u6240\u793a\u3002\u867d\u7136hashcode\u548cequals\u65b9\u6cd5\u4ecd\u9700\u624b\u52a8\u7f16\u5199\uff0c\u4f46IDE\u80fd\u591f\u81ea\u52a8\u751f\u6210\u3002\u8fd9\u4e00\u7279\u6027\u6709\u6548\u89e3\u51b3\u4e86\u6a21\u677f\u4ee3\u7801\u95ee\u9898\uff0c\u63d0\u5347\u4e86\u4ee3\u7801\u6574\u6d01\u5ea6\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n\n\n\n
package com.summo.jdk17;\n\n\/**\n * 3\u661f\n *\n * @param stuId     \u5b66\u751fID\n * @param stuName   \u5b66\u751f\u540d\u79f0\n * @param stuAge    \u5b66\u751f\u5e74\u9f84\n * @param stuGender \u5b66\u751f\u6027\u522b\n * @param stuEmail  \u5b66\u751f\u90ae\u7bb1\n *\/\npublic record StudentRecord(Long stuId,\n                            String stuName,\n                            int stuAge,\n                            String stuGender,\n                            String stuEmail) {\n    public StudentRecord {\n        System.out.println(\"\u6784\u9020\u51fd\u6570\");\n    }\n\n    public static void main(String[] args) {\n        StudentRecord record = new StudentRecord(1L, \"\u5f20\u4e09\", 16, \"\u7537\", \"xxx@qq.com\");\n        System.out.println(record);\n    }\n}<\/pre>\n\n\n\n
4. \u5168\u65b0\u7684switch\u8868\u8fbe\u5f0f<\/strong><\/p>\n\n\n\n
\u6709\u4eba\u53ef\u80fd\u95ee\u4e86\uff0cJava\u8bed\u8a00\u4e0d\u65e9\u5df2\u652f\u6301switch\u4e86\u561b\uff0c\u6709\u4ec0\u4e48\u597d\u63d0\u7684\uff1f\u8bb2\u771f\uff0c\u8fd9\u6b21\u7684\u63d0\u5347\u8fd8\u771f\u6709\u5fc5\u8981\u597d\u597d\u5730\u6765\u804a\u4e00\u804a\u4e86\u3002<\/p>\n\n\n\n
\u5728Java12\u7684\u65f6\u5019\u5c31\u5f15\u5165\u4e86switch\u8868\u8fbe\u5f0f\uff0c\u6ce8\u610f\u8fd9\u91cc\u662f\u8868\u8fbe\u5f0f\uff0c\u800c\u4e0d\u662f\u8bed\u53e5\uff0c\u539f\u6765\u7684switch\u662f\u8bed\u53e5\u3002\u5982\u679c\u4e0d\u6e05\u695a\u4e24\u8005\u7684\u533a\u522b\u7684\u8bdd\uff0c\u6700\u597d\u5148\u53bb\u4e86\u89e3\u4e00\u4e0b\u3002\u4e3b\u8981\u7684\u5dee\u522b\u5c31\u662f\u5c31\u662f\u8868\u8fbe\u5f0f\u6709\u8fd4\u56de\u503c\uff0c\u800c\u8bed\u53e5\u5219\u6ca1\u6709\u3002\u518d\u914d\u5408\u6a21\u5f0f\u5339\u914d\uff0c\u4ee5\u53cayield\u548c\u201c->\u201d\u7b26\u53f7\u7684\u52a0\u5165\uff0c\u5168\u65b0\u7684switch\u7528\u8d77\u6765\u723d\u5230\u98de\u8d77\u6765\u3002<\/p>\n\n\n\n
package com.summo.jdk17;\n\npublic class SwitchDemo {\n    \/**\n     * \u5728JDK8\u4e2d\u83b7\u53d6switch\u8fd4\u56de\u503c\u65b9\u5f0f\n     *\n     * @param week\n     * @return\n     *\/\n    public int getByJDK8(Week week) {\n        int i = 0;\n        switch (week) {\n            case MONDAY, TUESDAY:\n                i = 1;\n                break;\n            case WEDNESDAY:\n                i = 3;\n                break;\n            case THURSDAY:\n                i = 4;\n                break;\n            case FRIDAY:\n                i = 5;\n                break;\n            case SATURDAY:\n                i = 6;\n                break;\n            case SUNDAY:\n                i = 7;\n                break;\n            default:\n                i = 0;\n                break;\n        }\n\n        return i;\n    }\n\n    \/**\n     * \u5728JDK17\u4e2d\u83b7\u53d6switch\u8fd4\u56de\u503c\n     *\n     * @param week\n     * @return\n     *\/\n    public int getByJDK17(Week week) {\n        \/\/ 1, \u73b0\u5728\u7684switch\u53d8\u6210\u4e86\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u8fd4\u56de\u503c\u4e86\uff0c\u800c\u4e14\u652f\u6301yield\u548c->\u7b26\u53f7\u6765\u8fd4\u56de\u503c\n        \/\/ 2, \u518d\u4e5f\u4e0d\u7528\u62c5\u5fc3\u6f0f\u5199\u4e86break\uff0c\u800c\u5bfc\u81f4\u51fa\u95ee\u9898\u4e86\n        \/\/ 3, case\u540e\u9762\u652f\u6301\u5199\u591a\u4e2a\u6761\u4ef6\n        return switch (week) {\n            case null -> -1;\n            case MONDAY -> 1;\n            case TUESDAY -> 2;\n            case WEDNESDAY -> 3;\n            case THURSDAY -> {yield 4;}\n            case FRIDAY -> 5;\n            case SATURDAY, SUNDAY -> 6;\n            default -> 0;\n        };\n    }\n\n    private enum Week {\n        MONDAY,\n        TUESDAY,\n        WEDNESDAY,\n        THURSDAY,\n        FRIDAY,\n        SATURDAY,\n        SUNDAY\n    }\n}<\/pre>\n\n\n\n
5. \u79c1\u6709\u63a5\u53e3\u65b9\u6cd5<\/strong><\/p>\n\n\n\n
\u4eceJava8\u5f00\u59cb\uff0c\u5141\u8bb8\u5728interface\u91cc\u9762\u6dfb\u52a0\u9ed8\u8ba4\u65b9\u6cd5\uff0c\u5176\u5b9e\u5f53\u65f6\u5c31\u6709\u4e9b\u5c0f\u56f0\u60d1\uff0c\u5982\u679c\u4e00\u4e2adefault\u65b9\u6cd5\u4f53\u5f88\u5927\u600e\u4e48\u529e\uff0c\u62c6\u5230\u53e6\u5916\u7684\u7c7b\u53bb\u5199\u5417\uff1f<\/p>\n\n\n\n
\u5b9e\u5728\u6709\u4e9b\u4e0d\u592a\u5408\u7406\uff0c\u6240\u4ee5\u5728Java17\u91cc\u9762\uff0c\u5982\u679c\u4e00\u4e2adefault\u65b9\u6cd5\u4f53\u5f88\u5927\uff0c\u90a3\u4e48\u53ef\u4ee5\u901a\u8fc7\u65b0\u589e\u63a5\u53e3\u79c1\u6709\u65b9\u6cd5\u6765\u8fdb\u884c\u4e00\u4e2a\u5408\u7406\u7684\u62c6\u5206\u4e86\uff0c\u4e3a\u8fd9\u4e2a\u5c0f\u6539\u8fdb\u70b9\u4e2a\u8d5e\u3002<\/p>\n\n\n\n
public interface PrivateInterfaceMethod {\n    \/**\n     * \u63a5\u53e3\u9ed8\u8ba4\u65b9\u6cd5\n     *\/\n    default void defaultMethod() {\n        privateMethod();\n    }\n\n    \/\/ \u63a5\u53e3\u79c1\u6709\u65b9\u6cd5\uff0c\u5728Java8\u91cc\u9762\u662f\u4e0d\u88ab\u5141\u8bb8\u7684\uff0c\u4e0d\u4fe1\u4f60\u8bd5\u8bd5\n    private void privateMethod() {\n    }\n}<\/pre>\n\n\n\n
6. \u6a21\u5f0f\u5339\u914d<\/strong><\/p>\n\n\n\n
\u5728JDK 17\u4e2d\uff0c\u6a21\u5f0f\u5339\u914d\u4e3b\u8981\u7528\u4e8einstanceof\u8868\u8fbe\u5f0f\u3002\u6a21\u5f0f\u5339\u914d\u589e\u5f3a\u4e86instanceof\u7684\u8bed\u6cd5\u548c\u529f\u80fd\uff0c\u4f7f\u7c7b\u578b\u68c0\u67e5\u548c\u7c7b\u578b\u8f6c\u6362\u66f4\u52a0\u7b80\u6d01\u548c\u9ad8\u6548\u3002\u5728\u4f20\u7edf\u7684Java\u7248\u672c\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u4f7f\u7528instanceof\u7ed3\u5408\u7c7b\u578b\u8f6c\u6362\u6765\u5224\u65ad\u5bf9\u8c61\u7c7b\u578b\u5e76\u8fdb\u884c\u5904\u7406\uff0c\u8fd9\u5f80\u5f80\u4f1a\u5bfc\u81f4\u5197\u957f\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n
\u539f\u6765\u7684\u5199\u6cd5<\/p>\n\n\n\n
\/**\n * \u65e7\u5f0f\u5199\u6cd5\n *\n * @param value\n *\/\npublic void matchByJDK8(Object value) {\n    if (value instanceof String) {\n        String v = (String)value;\n        System.out.println(\"\u9047\u5230\u4e00\u4e2aString\u7c7b\u578b\" + v.toUpperCase());\n    } else if (value instanceof Integer) {\n        Integer v = (Integer)value;\n    System.out.println(\"\u9047\u5230\u4e00\u4e2a\u6574\u578b\u7c7b\u578b\" + v.longValue());\n    }\n}\n\n<\/pre>\n\n\n\n
\u65b0\u7684\u5199\u6cd5<\/p>\n\n\n\n
\/**\n * \u8f6c\u6362\u5e76\u7533\u8bf7\u4e86\u4e00\u4e2a\u65b0\u7684\u53d8\u91cf\uff0c\u6781\u5927\u5730\u65b9\u4fbf\u4e86\u4ee3\u7801\u7684\u7f16\u5199\n *\n * @param value\n *\/\npublic void matchByJDK17(Object value) {\n    if (value instanceof String v) {\n        System.out.println(\"\u9047\u5230\u4e00\u4e2aString\u7c7b\u578b\" + v.toUpperCase());\n    } else if (value instanceof Integer v) {\n        System.out.println(\"\u9047\u5230\u4e00\u4e2a\u6574\u578b\u7c7b\u578b\" + v.longValue());\n    }\n}<\/pre>\n\n\n\n
7. \u96c6\u5408\u7c7b\u7684\u5de5\u5382\u65b9\u6cd5<\/strong><\/p>\n\n\n\n
\u5728Java8\u7684\u5e74\u4ee3\uff0c\u5373\u4fbf\u521b\u5efa\u4e00\u4e2a\u5f88\u5c0f\u7684\u96c6\u5408\uff0c\u6216\u8005\u56fa\u5b9a\u5143\u7d20\u7684\u96c6\u5408\u90fd\u662f\u6bd4\u8f83\u9ebb\u70e6\u7684\uff0c\u4e3a\u4e86\u7b80\u6d01\u4e00\u4e9b\uff0c\u6709\u65f6\u6211\u751a\u81f3\u4f1a\u5f15\u5165\u4e00\u4e9b\u4f9d\u8d56\u3002<\/p>\n\n\n\n
\u539f\u6765\u7684\u5199\u6cd5<\/p>\n\n\n\n
Set<String> set = new HashSet<>();\nset.add(\"a\");\nset.add(\"b\");\nset.add(\"c\"<\/pre>\n\n\n\n
\u65b0\u7684\u5199\u6cd5<\/p>\n\n\n\n
Set<String> set = Set.of(\"a\", \"b\", \"c\");<\/pre>\n\n\n\n
\u4e8c\u3001\u5176\u4ed6\u7684\u65b0\u7279\u6027<\/strong><\/p>\n\n\n\n
\n\n\n\n
1. \u65b0\u7684String\u65b9\u6cd5<\/strong><\/p>\n\n\n\n
    \n
  • repeat<\/code>\uff1a\u91cd\u590d\u751f\u6210\u5b57\u7b26\u4e32<\/li>\n\n\n\n
  • isBlank<\/code>\uff1a\u4e0d\u7528\u5728\u5f15\u5165\u7b2c\u4e09\u65b9\u5e93\u5c31\u53ef\u4ee5\u5b9e\u73b0\u5b57\u7b26\u4e32\u5224\u7a7a\u4e86<\/li>\n\n\n\n
  • strip<\/code>\uff1a\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u8fb9\u7684\u7a7a\u683c\uff0c\u652f\u6301\u5168\u89d2\u548c\u534a\u89d2\uff0c\u4e4b\u524d\u7684trim\u53ea\u652f\u6301\u534a\u89d2<\/li>\n\n\n\n
  • lines<\/code>\uff1a\u80fd\u6839\u636e\u4e00\u6bb5\u5b57\u7b26\u4e32\u4e2d\u7684\u7ec8\u6b62\u7b26\u63d0\u53d6\u51fa\u884c\u4e3a\u5355\u4f4d\u7684\u6d41<\/li>\n\n\n\n
  • indent<\/code>\uff1a\u7ed9\u5b57\u7b26\u4e32\u505a\u7f29\u8fdb\uff0c\u63a5\u53d7\u4e00\u4e2aint\u578b\u7684\u8f93\u5165<\/li>\n\n\n\n
  • transform<\/code>\uff1a\u63a5\u53d7\u4e00\u4e2a\u8f6c\u6362\u51fd\u6570\uff0c\u5b9e\u73b0\u5b57\u7b26\u4e32\u7684\u8f6c\u6362<\/li>\n<\/ul>\n\n\n\n
    2. Stream API\u7684\u589e\u5f3a<\/strong><\/p>\n\n\n\n
    \u589e\u52a0takeWhile, dropWhile, ofNullable, iterate\u4ee5\u53catoList\u7684API\uff0c\u8d8a\u6765\u8d8a\u50cf\u4e00\u4e9b\u51fd\u6570\u5f0f\u8bed\u8a00\u4e86\u3002\u7528\u6cd5\u4e3e\u4f8b\u5982\u4e0b\u3002<\/p>\n\n\n\n
    \/\/ takeWhile \u987a\u5e8f\u8fd4\u56de\u7b26\u5408\u6761\u4ef6\u7684\u503c\uff0c\u76f4\u5230\u6761\u4ef6\u4e0d\u7b26\u5408\u65f6\u5373\u7ec8\u6b62\u7ee7\u7eed\u5224\u65ad\uff0c\n\/\/ \u6b64\u5916toList\u65b9\u6cd5\u7684\u52a0\u5165\uff0c\u4e5f\u5927\u5927\u51cf\u5c11\u4e86\u8282\u7701\u4e86\u4ee3\u7801\u91cf\uff0c\u514d\u53bb\u4e86\u8c03\u7528collect(Collectors::toList)\u65b9\u6cd5\u4e86\nList<Integer> list = Stream.of(2,2,3,4,5,6,7,8,9,10)\n        .takeWhile(i->(i%2==0)).toList(); \/\/ \u8fd4\u56de2, 2\n\n\/\/ dropWhile \u987a\u5e8f\u53bb\u6389\u7b26\u5408\u6761\u4ef6\u7684\u503c\uff0c\u76f4\u5230\u6761\u4ef6\u4e0d\u7b26\u5408\u65f6\u5373\u7ec8\u6b62\u7ee7\u7eed\u5224\u65ad\nList<Integer> list1 = Stream.of(2,2,3,4,5,6,7,8,9,10)\n        .dropWhile(i->(i%2==0)).toList(); \/\/\u8fd4\u56de3, 4, 5, 6, 7, 8, 9, 10\n\n\/\/ ofNullable\uff0c\u652f\u6301\u4f20\u5165\u7a7a\u6d41\uff0c\u82e5\u6ca1\u6709\u8fd9\u4e2a\u4e14\u4f20\u5165\u4e00\u4e2a\u7a7a\u6d41\uff0c\u90a3\u4e48\u5c06\u4f1a\u629bNPE\nvar nullStreamCount = Stream.ofNullable(null).count(); \/\/\u8fd4\u56de0\n\n\/\/ \u4ee5\u4e0b\u4e24\u884c\u90fd\u5c06\u8f93\u51fa0\u52309\nStream.iterate(0, n -> n < 10, n -> n + 1).forEach(x -> System.out.println(x));\nStream.iterate(0, n -> n + 1).limit(10).forEach(x -> System.out.println(x));<\/pre>\n\n\n\n
    3. \u5168\u65b0\u7684HttpClient<\/strong><\/p>\n\n\n\n
    \u8fd9\u4e2aAPI\u9996\u6b21\u51fa\u73b0\u57289\u4e4b\u4e2d\uff0c\u4e0d\u8fc7\u5f53\u65f6\u5e76\u975e\u662f\u4e00\u4e2a\u7a33\u5b9a\u7248\u672c\uff0c\u5728Java11\u4e2d\u6b63\u5f0f\u5f97\u5230\u53d1\u5e03\uff0c\u6240\u4ee5\u5728Java17\u91cc\u9762\u53ef\u4ee5\u653e\u5fc3\u5730\u8fdb\u884c\u4f7f\u7528\u3002<\/p>\n\n\n\n
    \u539f\u6765\u7684JDK\u81ea\u5e26\u7684Http\u5ba2\u6237\u7aef\u771f\u7684\u975e\u5e38\u96be\u7528\uff0c\u8fd9\u4e5f\u5c31\u7ed9\u4e86\u5f88\u591a\u50cfokhttp\u3001restTemplate\u3001Apache\u7684HttpClient\u548cfeign\u8fd9\u6837\u7684\u7b2c\u4e09\u65b9\u5e93\u6781\u5927\u7684\u53d1\u6325\u7a7a\u95f4\uff0c\u51e0\u4e4e\u5c31\u6ca1\u6709\u4eba\u613f\u610f\u53bb\u7528\u539f\u751f\u7684Http\u5ba2\u6237\u7aef\u7684\u3002<\/p>\n\n\n\n
    \u4f46\u73b0\u5728\u4e0d\u4e00\u6837\u4e86\uff0c\u611f\u89c9\u50cf\u662f\u65b0\u65f6\u4ee3\u7684API\u4e86\u3002FluentAPI\u98ce\u683c\uff0c\u5904\u5904\u5145\u6ee1\u4e86\u73b0\u4ee3\u98ce\u683c\uff0c\u7528\u8d77\u6765\u4e5f\u975e\u5e38\u5730\u65b9\u4fbf\uff0c\u518d\u4e5f\u4e0d\u7528\u53bb\u4f9d\u8d56\u7b2c\u4e09\u65b9\u7684\u5305\u4e86\uff0c\u5c31\u4e24\u4e2a\u5b57\uff0c\u6e05\u723d\u3002<\/p>\n\n\n\n
    \/\/ \u540c\u6b65\u8bf7\u6c42\nHttpClient client = HttpClient.newBuilder()\n        .version(Version.HTTP_1_1)\n        .followRedirects(Redirect.NORMAL)\n        .connectTimeout(Duration.ofSeconds(20))\n        .proxy(ProxySelector.of(new InetSocketAddress(\"proxy.example.com\", 80)))\n        .authenticator(Authenticator.getDefault())\n        .build();\n   HttpResponse<String> response = client.send(request, BodyHandlers.ofString());\n   System.out.println(response.statusCode());\n   System.out.println(response.body()); \n\/\/ \u5f02\u6b65\u8bf7\u6c42\nHttpRequest request = HttpRequest.newBuilder()\n        .uri(URI.create(\"https:\/\/foo.com\/\"))\n        .timeout(Duration.ofMinutes(2))\n        .header(\"Content-Type\", \"application\/json\")\n        .POST(BodyPublishers.ofFile(Paths.get(\"file.json\")))\n        .build();\n   client.sendAsync(request, BodyHandlers.ofString())\n        .thenApply(HttpResponse::body)\n        .thenAccept(System.out::println);<\/pre>\n\n\n\n
    4. jshell<\/strong><\/p>\n\n\n\n
    \u5728\u65b0\u7684JDK\u7248\u672c\u4e2d\uff0c\u652f\u6301\u76f4\u63a5\u5728\u547d\u4ee4\u884c\u4e0b\u6267\u884cjava\u7a0b\u5e8f\uff0c\u7c7b\u4f3c\u4e8epython\u7684\u4ea4\u4e92\u5f0fREPL\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u4f7f\u7528 JShell\uff0c\u4f60\u53ef\u4ee5\u8f93\u5165\u4ee3\u7801\u7247\u6bb5\u5e76\u9a6c\u4e0a\u770b\u5230\u8fd0\u884c\u7ed3\u679c\uff0c\u7136\u540e\u5c31\u53ef\u4ee5\u6839\u636e\u9700\u8981\u4f5c\u51fa\u8c03\u6574\uff0c\u8fd9\u6837\u5728\u9a8c\u8bc1\u4e00\u4e9b\u7b80\u5355\u7684\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7jshell\u5f97\u5230\u5feb\u901f\u5730\u9a8c\u8bc1\uff0c\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n\n\n\n
    5. java\u547d\u4ee4\u76f4\u63a5\u6267\u884cjava\u6587\u4ef6<\/strong><\/p>\n\n\n\n
    \u5728\u73b0\u5728\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u6267\u884c\u201cjava xxx.java<\/code>\u201d\uff0c\u5373\u53ef\u8fd0\u884c\u8be5java\u6587\u4ef6\uff0c\u65e0\u987b\u5148\u6267\u884cjavac\uff0c\u7136\u540e\u518d\u6267\u884cjava\uff0c\u662f\u4e0d\u662f\u53c8\u7b80\u5355\u4e86\u4e00\u6b65\u3002<\/p>\n\n\n\n
    6. ZGC<\/strong><\/p>\n\n\n\n
    \u5728ParallelOldGC\u3001CMS\u548cG1\u4e4b\u540e\uff0cJDK 11\u5f15\u5165\u4e86\u5168\u65b0\u7684ZGC\uff08Z Garbage Collector\uff09\u3002\u8fd9\u4e2a\u540d\u5b57\u672c\u8eab\u5c31\u663e\u5f97\u5f88\u725b\u3002\u5b98\u65b9\u5ba3\u79f0ZGC\u7684\u5783\u573e\u56de\u6536\u505c\u987f\u65f6\u95f4\u4e0d\u8d85\u8fc710ms\uff0c\u80fd\u652f\u6301\u9ad8\u8fbe16TB\u7684\u5806\u7a7a\u95f4\uff0c\u5e76\u4e14\u505c\u987f\u65f6\u95f4\u4e0d\u4f1a\u968f\u7740\u5806\u7684\u589e\u5927\u800c\u589e\u52a0\u3002<\/p>\n\n\n\n
    \u90a3\u4e48\uff0cZGC\u5230\u5e95\u89e3\u51b3\u4e86\u4ec0\u4e48\u95ee\u9898\uff1fOracle\u5b98\u65b9\u4ecb\u7ecd\u5b83\u662f\u4e00\u4e2a\u53ef\u4f38\u7f29\u7684\u4f4e\u5ef6\u8fdf\u5783\u573e\u56de\u6536\u5668\uff0c\u65e8\u5728\u964d\u4f4e\u505c\u987f\u65f6\u95f4\uff0c\u5c3d\u7ba1\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u541e\u5410\u91cf\u7684\u964d\u4f4e\u3002\u4e0d\u8fc7\uff0c\u901a\u8fc7\u6a2a\u5411\u6269\u5c55\u670d\u52a1\u5668\u53ef\u4ee5\u89e3\u51b3\u541e\u5410\u91cf\u95ee\u9898\u3002\u5b98\u65b9\u5df2\u5efa\u8baeZGC\u53ef\u7528\u4e8e\u751f\u4ea7\u73af\u5883\uff0c\u8fd9\u65e0\u7591\u5c06\u6210\u4e3a\u672a\u6765\u7684\u4e3b\u6d41\u5783\u573e\u56de\u6536\u5668\u3002\u8981\u4e86\u89e3\u66f4\u591a\uff0c\u8bf7\u53c2\u9605\u5b98\u65b9\u6587\u6863\uff1a<\/p>\n\n\n\n
    https:\/\/docs.oracle.com\/en\/java\/javase\/17\/gctuning\/z-garbage-collector.html<\/pre>\n\n\n\n
    \u4e09\u3001\u5c0f\u7ed3\u4e00\u4e0b<\/strong><\/p>\n\n\n\n
    \n\n\n\n
    \u4f5c\u4e3a\u7a0b\u5e8f\u5458\uff0c\u6301\u7eed\u5b66\u4e60\u548c\u5145\u7535\u975e\u5e38\u91cd\u8981\u3002\u968f\u7740Java8\u5373\u5c06\u505c\u6b62\u514d\u8d39\u5b98\u65b9\u652f\u6301\uff0c\u8d8a\u6765\u8d8a\u591a\u7684\u9879\u76ee\u5c06\u8f6c\u5411Java17\uff0c\u5305\u62ec\u5927\u540d\u9f0e\u9f0e\u7684Spring Boot 3.0\uff0c\u5b83\u57282022\u5e741\u670820\u65e5\u53d1\u5e03\u7684\u7b2c\u4e00\u4e2a\u91cc\u7a0b\u7891\u7248\u672c\uff08M1\uff09\u6b63\u662f\u57fa\u4e8eJava17\u6784\u5efa\u7684\u3002\u8be5\u9879\u76ee\u4f9d\u8d56\u7684\u6240\u6709\u7ec4\u4ef6\u4e5f\u5c06\u5feb\u901f\u5347\u7ea7\uff0c\u672a\u6765\u5982\u679c\u60f3\u5229\u7528\u67d0\u4e9b\u65b0\u7279\u6027\uff0c\u5728Java8\u4e0b\u5c06\u65e0\u6cd5\u901a\u8fc7\u7f16\u8bd1.\uff0c\u5230\u8fd9\u65f6\u5019\u518d\u6362\u5c31\u771f\u7684\u665a\u4e86\u2026 \u2026<\/p>\n","protected":false},"excerpt":{"rendered":"
    JDK\u7248\u672c\u5347\u7ea7\u7684\u975e\u5e38\u5feb\uff0c\u73b0\u5728\u5df2\u7ecf\u5230JDK20\u4e86\u3002JDK\u7248\u672c\u867d\u591a\uff0c\u4f46\u5e94\u7528\u6700\u5e7f\u6cdb\u7684\u8fd8\u5f97\u662fJDK8\uff0c\u6b63\u6240\u8c13\u201c\u4ed6\u53d1\u4efb\u4ed6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/15639"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=15639"}],"version-history":[{"count":1,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/15639\/revisions"}],"predecessor-version":[{"id":15641,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/15639\/revisions\/15641"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15639"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15639"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15639"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}