{"id":413,"date":"2023-05-24T12:04:45","date_gmt":"2023-07-01T22:59:07","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-9-%e7%89%b9%e6%80%a7%e4%b8%be%e4%be%8b\/"},"modified":"2025-08-02T06:06:12","modified_gmt":"2025-08-01T22:06:12","slug":"java-9-%e7%89%b9%e6%80%a7%e4%b8%be%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-9-%e7%89%b9%e6%80%a7%e4%b8%be%e4%be%8b\/","title":{"rendered":"Java 9\u65b0\u7279\u6027\u5b8c\u5168\u6307\u5357\uff1a\u5f00\u53d1\u8005\u5fc5\u77e5\u529f\u80fd\u4e0e\u5b9e\u4f8b\u89e3\u6790"},"content":{"rendered":"

Java 9\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u7248\u672c\u53d1\u5e03\uff0c\u4e3a\u5f00\u53d1\u8005\u5e26\u6765\u4e86\u8bb8\u591a\u529f\u80fd\u3002\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdJava 9\u7684\u7279\u6027\u3002<\/p>\n

Java 10\u5df2\u7ecf\u53d1\u5e03\uff0c\u60f3\u4e86\u89e3Java 10\u53d1\u5e03\u7684\u5b8c\u6574\u6982\u8ff0\uff0c\u8bf7\u9605\u8bfbJava 10\u529f\u80fd\u3002<\/p>\n

Java 9\u7684\u7279\u6027\u4e00\u4e9b\u91cd\u8981\u7684Java 9\u529f\u80fd\u5305\u62ec\uff1a<\/p>\n
    \n
  1. \n
      Java 9\u4e2d\u7684REPL\uff08JShell\uff09<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \u4e0d\u53ef\u53d8\u5217\u8868\u3001\u96c6\u5408\u3001\u6620\u5c04\u548c\u6620\u5c04\u6761\u76ee\u7684\u5de5\u5382\u65b9\u6cd5<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \n
          1. \n
              \u63a5\u53e3\u4e2d\u7684\u79c1\u6709\u65b9\u6cd5<\/ol>\n<\/li>\n<\/ol>\n

               <\/p>\n

                \n
              1. \n
                  Java 9\u6a21\u5757\u7cfb\u7edf<\/ol>\n<\/li>\n<\/ol>\n

                   <\/p>\n

                    \n
                  1. \n
                      \u8fdb\u7a0bAPI\u6539\u8fdb<\/ol>\n<\/li>\n<\/ol>\n

                       <\/p>\n

                        \n
                      1. \n
                          \u8d44\u6e90\u5904\u7406\u6539\u8fdb<\/ol>\n<\/li>\n<\/ol>\n

                           <\/p>\n

                            \n
                          1. \n
                              CompletableFuture API\u6539\u8fdb<\/ol>\n<\/li>\n<\/ol>\n

                               <\/p>\n

                                \n
                              1. \n
                                  \u54cd\u5e94\u5f0f\u6d41<\/ol>\n<\/li>\n<\/ol>\n

                                   <\/p>\n

                                    \n
                                  1. \n
                                      \u533f\u540d\u5185\u90e8\u7c7b\u7684\u94bb\u77f3\u64cd\u4f5c\u7b26<\/ol>\n<\/li>\n<\/ol>\n

                                       <\/p>\n

                                        \n
                                      1. \n
                                          Optional\u7c7b\u6539\u8fdb<\/ol>\n<\/li>\n<\/ol>\n

                                           <\/p>\n

                                            \n
                                          1. \n
                                              \u6d41API\u6539\u8fdb<\/ol>\n<\/li>\n<\/ol>\n

                                               <\/p>\n

                                                \n
                                              1. \n
                                                  \u589e\u5f3a\u7684@Deprecated\u6ce8\u91ca<\/ol>\n<\/li>\n<\/ol>\n

                                                   <\/p>\n

                                                    \n
                                                  1. \n
                                                      HTTP 2\u5ba2\u6237\u7aef<\/ol>\n<\/li>\n<\/ol>\n

                                                       <\/p>\n

                                                        \n
                                                      1. \n
                                                          \u591a\u5206\u8fa8\u7387\u56fe\u50cfAPI<\/ol>\n<\/li>\n<\/ol>\n

                                                           <\/p>\n

                                                            \u5176\u4ed6Java 9\u529f\u80fd<\/ol>\n

                                                            \u7532\u9aa8\u6587\u516c\u53f8\u8ba1\u5212\u4e8e2017\u5e743\u6708\u5e95\u53d1\u5e03Java SE 9\u3002\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5c06\u7b80\u8981\u8ba8\u8bba\u4e00\u4e9b\u201cJava 9\u7279\u6027\u201d\uff0c\u5e76\u7ed9\u51fa\u4e00\u4e9b\u793a\u4f8b\u3002<\/p>\n

                                                            Java 9 REPL\uff08JShell\uff09\u662f\u4ec0\u4e48\uff1fOracle\u516c\u53f8\u63a8\u51fa\u4e86\u4e00\u4e2a\u540d\u4e3a\u201cjshell\u201d\u7684\u65b0\u5de5\u5177\u3002\u5b83\u4ee3\u8868Java Shell\uff0c\u4e5f\u88ab\u79f0\u4e3aREPL\uff08\u8bfb\u53d6\u8bc4\u4f30\u6253\u5370\u5faa\u73af\uff09\u3002\u5b83\u975e\u5e38\u5bb9\u6613\u5730\u7528\u4e8e\u6267\u884c\u548c\u6d4b\u8bd5\u4efb\u4f55Java\u6784\u9020\uff0c\u5982\u7c7b\uff0c\u63a5\u53e3\uff0c\u679a\u4e3e\uff0c\u5bf9\u8c61\uff0c\u8bed\u53e5\u7b49\u3002\u6211\u4eec\u53ef\u4ee5\u4ecehttps:\/\/jdk9.java.net\/download\/\u4e0b\u8f7dJDK 9 EA\uff08\u65e9\u671f\u8bbf\u95ee\uff09\u8f6f\u4ef6\u3002<\/p>\n
                                                            G:\\>jshell\r\n|  Welcome to JShell -- Version 9-ea\r\n|  For an introduction type: \/help intro\r\n\r\n\r\njshell> int a = 10\r\na ==> 10\r\n\r\njshell> System.out.println(\"a value = \" + a )\r\na value = 10\r\n<\/code><\/pre>\n
                                                            \u5982\u679c\u60a8\u60f3\u4e86\u89e3\u66f4\u591a\u5173\u4e8e REPL \u5de5\u5177\u7684\u5185\u5bb9\uff0c\u8bf7\u9605\u8bfb\u300aJava 9 REPL \u57fa\u7840\u77e5\u8bc6\uff08\u7b2c1\u90e8\u5206\uff09\u300b\u548c\u300aJava 9 REPL \u7279\u6027\uff08\u7b2c2\u90e8\u5206\uff09\u300b\u3002<\/p>\n
                                                            \u4e0d\u53ef\u53d8\u5217\u8868\u3001\u96c6\u5408\u3001\u6620\u5c04\u548c\u6620\u5c04\u9879\u7684\u5de5\u5382\u65b9\u6cd5Oracle\u516c\u53f8\u5f15\u5165\u4e86\u4e00\u4e9b\u4fbf\u5229\u7684\u5de5\u5382\u65b9\u6cd5\uff0c\u7528\u4e8e\u521b\u5efa\u4e0d\u53ef\u53d8\u7684List\u3001Set\u3001Map\u548cMap.Entry\u5bf9\u8c61\u3002\u8fd9\u4e9b\u5b9e\u7528\u65b9\u6cd5\u7528\u4e8e\u521b\u5efa\u7a7a\u7684\u6216\u975e\u7a7a\u7684Collection\u5bf9\u8c61\u3002\u5728Java SE 8\u548c\u4e4b\u524d\u7684\u7248\u672c\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Collections\u7c7b\u7684\u5b9e\u7528\u65b9\u6cd5\uff0c\u5982unmodifiableXXX\u6765\u521b\u5efa\u4e0d\u53ef\u53d8\u7684Collection\u5bf9\u8c61\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u60f3\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684List\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528Collections.unmodifiableList\u65b9\u6cd5\u3002\u7136\u800c\uff0c\u8fd9\u4e9bCollections.unmodifiableXXX\u65b9\u6cd5\u662f\u4e00\u79cd\u7e41\u7410\u800c\u5197\u957f\u7684\u65b9\u6cd5\u3002\u4e3a\u4e86\u514b\u670d\u8fd9\u4e9b\u7f3a\u70b9\uff0cOracle\u516c\u53f8\u5728List\u3001Set\u548cMap\u63a5\u53e3\u4e2d\u6dfb\u52a0\u4e86\u51e0\u4e2a\u5b9e\u7528\u65b9\u6cd5\u3002List\u548cSet\u63a5\u53e3\u6709\u201cof()\u201d\u65b9\u6cd5\uff0c\u7528\u4e8e\u521b\u5efa\u7a7a\u7684\u6216\u975e\u7a7a\u7684\u4e0d\u53ef\u53d8\u7684List\u6216Set\u5bf9\u8c61\uff0c\u5982\u4e0b\u6240\u793a\uff1a\u7a7aList\u7684\u793a\u4f8b<\/p>\n
                                                            List immutableList = List.of();\r\n<\/code><\/pre>\n
                                                            \u975e\u7a7a\u5217\u8868\u793a\u4f8b<\/p>\n
                                                            List immutableList = List.of(\"one\",\"two\",\"three\");\r\n<\/code><\/pre>\n
                                                            \u5730\u56fe\u6709\u4e24\u5957\u65b9\u6cd5\uff1aof\uff08\uff09\u65b9\u6cd5\u548cofEntries\uff08\uff09\u65b9\u6cd5\u5206\u522b\u7528\u4e8e\u521b\u5efa\u4e0d\u53ef\u53d8\u7684\u5730\u56fe\u5bf9\u8c61\u548c\u4e0d\u53ef\u53d8\u7684\u5730\u56fe\u6761\u76ee\u5bf9\u8c61\u3002\u7a7a\u5730\u56fe\u793a\u4f8b\u3002<\/p>\n
                                                            jshell> Map emptyImmutableMap = Map.of()\r\nemptyImmutableMap ==> {}\r\n<\/code><\/pre>\n
                                                            \u975e\u7a7a\u5730\u56fe\u793a\u4f8b<\/p>\n
                                                            jshell> Map nonemptyImmutableMap = Map.of(1, \"one\", 2, \"two\", 3, \"three\")\r\nnonemptyImmutableMap ==> {2=two, 3=three, 1=one}\r\n<\/code><\/pre>\n
                                                            \u5982\u679c\u60a8\u60f3\u9605\u8bfb\u66f4\u591a\u5173\u4e8e\u8fd9\u4e9b\u5b9e\u7528\u65b9\u6cd5\u7684\u5185\u5bb9\uff0c\u8bf7\u9605\u8bfb\u4ee5\u4e0b\u94fe\u63a5\uff1a<\/p>\n
                                                              \n
                                                            • Java 9 Factory Methods for Immutable List<\/li>\n
                                                            • Java 9 Factory Methods for Immutable Set<\/li>\n
                                                            • Java 9 Factory Methods for Immutable Map and Map.Entry<\/li>\n<\/ul>\n
                                                              \u63a5\u53e3\u4e2d\u7684\u79c1\u6709\u65b9\u6cd5\u5728Java 8\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u9ed8\u8ba4\u548c\u9759\u6001\u65b9\u6cd5\u5728\u63a5\u53e3\u4e2d\u63d0\u4f9b\u65b9\u6cd5\u5b9e\u73b0\u3002\u7136\u800c\uff0c\u6211\u4eec\u4e0d\u80fd\u5728\u63a5\u53e3\u4e2d\u521b\u5efa\u79c1\u6709\u65b9\u6cd5\u3002\u4e3a\u4e86\u907f\u514d\u5197\u4f59\u4ee3\u7801\u5e76\u589e\u52a0\u53ef\u91cd\u7528\u6027\uff0cOracle\u516c\u53f8\u5c06\u5728Java SE 9\u63a5\u53e3\u4e2d\u5f15\u5165\u79c1\u6709\u65b9\u6cd5\u3002\u4eceJava SE 9\u5f00\u59cb\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u201cprivate\u201d\u5173\u952e\u5b57\u5728\u63a5\u53e3\u4e2d\u7f16\u5199\u79c1\u6709\u65b9\u6cd5\u548c\u79c1\u6709\u9759\u6001\u65b9\u6cd5\u3002\u8fd9\u4e9b\u79c1\u6709\u65b9\u6cd5\u548c\u5176\u4ed6\u7c7b\u7684\u79c1\u6709\u65b9\u6cd5\u4e00\u6837\uff0c\u6ca1\u6709\u4efb\u4f55\u533a\u522b\u3002<\/p>\n
                                                              public interface Card{\r\n\r\n  private Long createCardID(){\r\n    \/\/ Method implementation goes here.\r\n  }\r\n\r\n  private static void displayCardDetails(){\r\n    \/\/ Method implementation goes here.\r\n  }\r\n\r\n}\r\n<\/code><\/pre>\n
                                                              \u5982\u679c\u4f60\u60f3\u8981\u9605\u8bfb\u66f4\u591a\u5173\u4e8e\u8fd9\u4e2a\u65b0\u529f\u80fd\u7684\u5185\u5bb9\uff0c\u8bf7\u901a\u8fc7\u8fd9\u4e2a\u94fe\u63a5\u67e5\u770b\uff1aJava 9\u63a5\u53e3\u4e2d\u7684\u79c1\u6709\u65b9\u6cd5\u3002<\/p>\n
                                                              Java 9 \u7684\u6a21\u5757\u7cfb\u7edfJigsaw \u9879\u76ee\u7684\u4e00\u9879\u91cd\u5927\u53d8\u9769\u6216 Java 9 \u529f\u80fd\u662f\u6a21\u5757\u7cfb\u7edf\u3002Oracle \u516c\u53f8\u5c06\u4f5c\u4e3a Jigsaw \u9879\u76ee\u7684\u4e00\u90e8\u5206\u63a8\u51fa\u4ee5\u4e0b\u7279\u6027\u3002<\/p>\n
                                                                \n
                                                              • Modular JDK<\/li>\n
                                                              • Modular Java Source Code<\/li>\n
                                                              • Modular Run-time Images<\/li>\n
                                                              • Encapsulate Java Internal APIs<\/li>\n
                                                              • Java Platform Module System<\/li>\n<\/ul>\n
                                                                \u5728Java SE 9\u4e4b\u524d\u7684\u7248\u672c\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u5355\u4f53Jars\u6765\u5f00\u53d1\u57fa\u4e8eJava\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u8fd9\u79cd\u67b6\u6784\u6709\u5f88\u591a\u9650\u5236\u548c\u7f3a\u70b9\u3002\u4e3a\u4e86\u907f\u514d\u6240\u6709\u8fd9\u4e9b\u95ee\u9898\uff0cJava SE 9\u5f15\u5165\u4e86\u6a21\u5757\u5316\u7cfb\u7edf\u3002JDK 9\u5e26\u670992\u4e2a\u6a21\u5757\uff08\u6700\u7ec8\u53d1\u5e03\u53ef\u80fd\u4f1a\u6709\u6240\u53d8\u5316\uff09\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528JDK\u6a21\u5757\uff0c\u4e5f\u53ef\u4ee5\u6309\u4ee5\u4e0b\u793a\u4f8b\u521b\u5efa\u6211\u4eec\u81ea\u5df1\u7684\u6a21\u5757\uff1a\u7b80\u5355\u6a21\u5757\u793a\u4f8b\u3002<\/p>\n
                                                                module com.foo.bar { }\r\n<\/code><\/pre>\n
                                                                \u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u6b63\u5728\u4f7f\u7528\u201c\u6a21\u5757\u201d\u6765\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u6a21\u5757\u3002\u6bcf\u4e2a\u6a21\u5757\u90fd\u6709\u4e00\u4e2a\u540d\u79f0\uff0c\u76f8\u5173\u7684\u4ee3\u7801\u548c\u5176\u4ed6\u8d44\u6e90\u3002\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u8fd9\u79cd\u65b0\u67b6\u6784\u7684\u8be6\u7ec6\u4fe1\u606f\u548c\u5b9e\u9645\u64cd\u4f5c\u7ecf\u9a8c\uff0c\u8bf7\u67e5\u9605\u6211\u5728\u8fd9\u91cc\u7684\u539f\u521b\u6559\u7a0b\u3002<\/p>\n
                                                                  \n
                                                                • Java 9 Module System Basics<\/li>\n
                                                                • Java 9 Module Examples using command prompt<\/li>\n
                                                                • Java 9 Hello World Module Example using Eclipse IDE<\/li>\n<\/ul>\n
                                                                  \u8fc7\u7a0bAPI\u6539\u8fdbJava SE 9\u5c06\u5e26\u6765\u4e00\u4e9b\u8fdb\u7a0bAPI\u7684\u6539\u8fdb\u3002\u4ed6\u4eec\u589e\u52a0\u4e86\u51e0\u4e2a\u65b0\u7684\u7c7b\u548c\u65b9\u6cd5\u6765\u65b9\u4fbf\u63a7\u5236\u548c\u7ba1\u7406\u64cd\u4f5c\u7cfb\u7edf\u8fdb\u7a0b\u3002\u8fdb\u7a0bAPI\u4e2d\u7684\u4e24\u4e2a\u65b0\u63a5\u53e3\uff1a<\/p>\n
                                                                    \n
                                                                  • java.lang.ProcessHandle<\/li>\n
                                                                  • java.lang.ProcessHandle.Info<\/li>\n<\/ul>\n
                                                                    API\u793a\u4f8b\u7684\u5904\u7406\u8fc7\u7a0b<\/p>\n
                                                                     ProcessHandle currentProcess = ProcessHandle.current();\r\n System.out.println(\"Current Process Id: = \" + currentProcess.getPid());\r\n<\/code><\/pre>\n
                                                                    \u6539\u8fdb\u4e86\u201c\u5c1d\u8bd5\u4f7f\u7528\u8d44\u6e90\u201d\u7684\u529f\u80fd\u3002
                                                                    \n\u8fd9\u662f\u6587\u7ae0\u300aJava 9 \u7279\u6027\u4e3e\u4f8b\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51712\u90e8\u5206\uff09\u3002<\/p>\n
                                                                    \u6211\u4eec\u77e5\u9053\uff0cJava SE 7\u5f15\u5165\u4e86\u4e00\u79cd\u65b0\u7684\u5f02\u5e38\u5904\u7406\u6784\u9020\uff1aTry-With-Resources\uff0c\u7528\u4e8e\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90\u3002\u8fd9\u4e2a\u65b0\u8bed\u53e5\u7684\u4e3b\u8981\u76ee\u6807\u662f”\u81ea\u52a8\u66f4\u597d\u7684\u8d44\u6e90\u7ba1\u7406”\u3002Java SE 9\u5c06\u4e3a\u8fd9\u4e2a\u8bed\u53e5\u63d0\u4f9b\u4e00\u4e9b\u6539\u8fdb\uff0c\u4ee5\u907f\u514d\u4e00\u4e9b\u5197\u957f\uff0c\u5e76\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/p>\n
                                                                    Java SE 7\u7684\u4f8b\u5b50<\/h4>\n
                                                                    void testARM_Before_Java9() throws IOException{\r\n BufferedReader reader1 = new BufferedReader(new FileReader(\"scdev.txt\"));\r\n try (BufferedReader reader2 = reader1) {\r\n   System.out.println(reader2.readLine());\r\n }\r\n}\r\n<\/code><\/pre>\n
                                                                    Java 9 \u793a\u4f8b<\/h4>\n
                                                                    void testARM_Java9() throws IOException{\r\n BufferedReader reader1 = new BufferedReader(new FileReader(\"scdev.txt\"));\r\n try (reader1) {\r\n   System.out.println(reader1.readLine());\r\n }\r\n}\r\n<\/code><\/pre>\n
                                                                    \u8981\u4e86\u89e3\u5173\u4e8e\u8fd9\u4e2a\u65b0\u529f\u80fd\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u9605\u8bfb\u6211\u539f\u59cb\u6559\u7a0b\u4e2d\u7684\u5185\u5bb9\uff1aJava 9 Try-With-Resources \u6539\u8fdb\u3002<\/p>\n
                                                                    CompletableFuture API\u7684\u6539\u8fdb<\/h3>\n
                                                                    \u5728Java SE 9\u4e2d\uff0c\u7532\u9aa8\u6587\u516c\u53f8\u5c06\u6539\u8fdbCompletableFuture API\u4ee5\u89e3\u51b3Java SE 8\u4e2d\u63d0\u51fa\u7684\u4e00\u4e9b\u95ee\u9898\u3002\u4ed6\u4eec\u5c06\u589e\u52a0\u5bf9\u5ef6\u8fdf\u548c\u8d85\u65f6\u7684\u652f\u6301\uff0c\u4e00\u4e9b\u5b9e\u7528\u5de5\u5177\u65b9\u6cd5\u548c\u66f4\u597d\u7684\u5b50\u7c7b\u5316\u3002<\/p>\n
                                                                    Executor exe = CompletableFuture.delayedExecutor(50L, TimeUnit.SECONDS);\r\n<\/code><\/pre>\n
                                                                    \u8fd9\u91cc\u7684delayedExecutor()\u662f\u4e00\u4e2a\u9759\u6001\u5b9e\u7528\u65b9\u6cd5\uff0c\u7528\u4e8e\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684Executor\uff0c\u5b83\u4f1a\u5728\u7ed9\u5b9a\u5ef6\u8fdf\u540e\u5c06\u4efb\u52a1\u63d0\u4ea4\u7ed9\u9ed8\u8ba4\u7684\u6267\u884c\u5668\u3002<\/p>\n
                                                                    \u54cd\u5e94\u5f0f\u6d41<\/h3>\n
                                                                    \u5982\u4eca\uff0c\u54cd\u5e94\u5f0f\u7f16\u7a0b\u5728\u5f00\u53d1\u5e94\u7528\u7a0b\u5e8f\u4e2d\u53d8\u5f97\u975e\u5e38\u6d41\u884c\uff0c\u53ef\u4ee5\u83b7\u5f97\u4e00\u4e9b\u7f8e\u597d\u7684\u76ca\u5904\u3002Scala\u3001Play\u3001Akka\u7b49\u6846\u67b6\u5df2\u7ecf\u96c6\u6210\u4e86\u54cd\u5e94\u5f0f\u6d41\u5e76\u83b7\u5f97\u4e86\u8bb8\u591a\u597d\u5904\u3002Oracle\u4e5f\u6b63\u5728Java SE 9\u4e2d\u5f15\u5165\u65b0\u7684\u54cd\u5e94\u5f0f\u6d41API\u3002Java SE 9\u7684\u54cd\u5e94\u5f0f\u6d41API\u662f\u4e00\u4e2a\u53d1\u5e03\/\u8ba2\u9605\u6846\u67b6\uff0c\u53ef\u4ee5\u5728Java\u8bed\u8a00\u4e2d\u8f7b\u677e\u5730\u5b9e\u73b0\u5f02\u6b65\u3001\u53ef\u6269\u5c55\u548c\u5e76\u884c\u5e94\u7528\u7a0b\u5e8f\u3002Java SE 9\u5f15\u5165\u4e86\u4ee5\u4e0bAPI\u6765\u5f00\u53d1\u57fa\u4e8eJava\u7684\u54cd\u5e94\u5f0f\u6d41\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n
                                                                      \n
                                                                    • java.util.concurrent.Flow<\/li>\n
                                                                    • java.util.concurrent.Flow.Publisher<\/li>\n
                                                                    • java.util.concurrent.Flow.Subscriber<\/li>\n
                                                                    • java.util.concurrent.Flow.Processor<\/li>\n<\/ul>\n
                                                                      \u5728Java 9\u7684”\u54cd\u5e94\u5f0f\u6d41”\u4e2d\u9605\u8bfb\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n
                                                                      \u533f\u540d\u5185\u90e8\u7c7b\u7684\u94bb\u77f3\u64cd\u4f5c\u7b26<\/h3>\n
                                                                      \u6211\u4eec\u77e5\u9053\uff0cJava SE 7\u5f15\u5165\u4e86\u4e00\u4e2a\u65b0\u7684\u529f\u80fd\uff1a\u94bb\u77f3\u64cd\u4f5c\u7b26\uff0c\u7528\u4e8e\u907f\u514d\u5197\u4f59\u4ee3\u7801\u548c\u5570\u55e6\uff0c\u6539\u5584\u53ef\u8bfb\u6027\u3002\u7136\u800c\uff0c\u5728Java SE 8\u4e2d\uff0cOracle\u516c\u53f8\uff08Java\u5e93\u5f00\u53d1\u4eba\u5458\uff09\u53d1\u73b0\u5728\u4f7f\u7528\u94bb\u77f3\u64cd\u4f5c\u7b26\u4e0e\u533f\u540d\u5185\u90e8\u7c7b\u65f6\u5b58\u5728\u4e00\u4e9b\u9650\u5236\u3002\u4ed6\u4eec\u5df2\u7ecf\u4fee\u590d\u4e86\u8fd9\u4e9b\u95ee\u9898\uff0c\u5e76\u8ba1\u5212\u5c06\u5176\u4f5c\u4e3aJava 9\u7684\u4e00\u90e8\u5206\u53d1\u5e03\u3002<\/p>\n
                                                                        public List getEmployee(String empid){\r\n     \/\/ \u4ece\u6570\u636e\u5b58\u50a8\u4e2d\u83b7\u53d6\u5458\u5de5\u8be6\u7ec6\u4fe1\u606f\u7684\u4ee3\u7801\r\n     return new List(emp){ };\r\n  }\r\n<\/code><\/pre>\n
                                                                      \u6211\u4eec\u5728\u8fd9\u91cc\u4f7f\u7528\u4e86”\u5217\u8868”\uff0c\u800c\u6ca1\u6709\u6307\u5b9a\u7c7b\u578b\u53c2\u6570\u3002<\/p>\n
                                                                      Optional\u7c7b\u7684\u6539\u8fdb<\/h3>\n
                                                                      \u5728Java SE 9\u4e2d\uff0cOracle\u516c\u53f8\u5411java.util.Optional\u7c7b\u6dfb\u52a0\u4e86\u4e00\u4e9b\u6709\u7528\u7684\u65b0\u65b9\u6cd5\u3002\u4e0b\u9762\u6211\u5c06\u8ba8\u8bba\u5176\u4e2d\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff1astream\u65b9\u6cd5\u3002\u5982\u679c\u7ed9\u5b9a\u7684Optional\u5bf9\u8c61\u4e2d\u5b58\u5728\u4e00\u4e2a\u503c\uff0c\u8be5stream()\u65b9\u6cd5\u5c06\u8fd4\u56de\u4e00\u4e2a\u987a\u5e8f\u6d41\uff0c\u5e76\u5305\u542b\u8be5\u503c\u3002\u5426\u5219\uff0c\u5b83\u5c06\u8fd4\u56de\u4e00\u4e2a\u7a7a\u7684\u6d41\u3002\u5982\u4e0b\u6240\u793a\uff0c\u4ed6\u4eec\u6dfb\u52a0\u4e86”stream()”\u65b9\u6cd5\u4ee5\u61d2\u60f0\u5730\u5904\u7406Optional\u5bf9\u8c61\u3002<\/p>\n
                                                                      Stream<Optional> emp = getEmployee(id)\r\nStream empStream = emp.flatMap(Optional::stream)\r\n<\/code><\/pre>\n
                                                                      \u5728\u8fd9\u91cc\uff0c\u4f7f\u7528Optional.stream()\u65b9\u6cd5\u5c06Optional\u7684Employee\u5bf9\u8c61\u6d41\u8f6c\u6362\u4e3aEmployee\u6d41\uff0c\u4ee5\u4fbf\u6211\u4eec\u53ef\u4ee5\u5728\u7ed3\u679c\u4ee3\u7801\u4e2d\u5bf9\u5176\u8fdb\u884c\u5ef6\u8fdf\u5904\u7406\u3002\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u8fd9\u4e2a\u529f\u80fd\u7684\u5185\u5bb9\u4ee5\u53caOptional\u7c7b\u4e2d\u6dfb\u52a0\u7684\u66f4\u591a\u65b0\u65b9\u6cd5\u7684\u4f8b\u5b50\uff0c\u8bf7\u9605\u8bfb\u6211\u539f\u521b\u7684\u6559\u7a0b\uff1aJava SE 9\uff1aOptional\u7c7b\u7684\u6539\u8fdb\u3002<\/p>\n
                                                                      Stream API\u7684\u6539\u8fdb<\/h3>\n
                                                                      \u5728Java SE 9\u4e2d\uff0cOracle Corp\u5df2\u7ecf\u5411java.util.Stream\u63a5\u53e3\u4e2d\u6dfb\u52a0\u4e86\u56db\u4e2a\u6709\u7528\u7684\u65b0\u65b9\u6cd5\u3002\u7531\u4e8eStream\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u6240\u6709\u8fd9\u4e9b\u65b0\u7684\u5b9e\u73b0\u65b9\u6cd5\u90fd\u662f\u9ed8\u8ba4\u65b9\u6cd5\u3002\u5176\u4e2d\u4e24\u4e2a\u975e\u5e38\u91cd\u8981\uff1adropWhile\u548ctakeWhile\u65b9\u6cd5\u3002\u5982\u679c\u60a8\u719f\u6089Scala\u8bed\u8a00\u6216\u4efb\u4f55\u51fd\u6570\u5f0f\u7f16\u7a0b\u8bed\u8a00\uff0c\u60a8\u80af\u5b9a\u4f1a\u4e86\u89e3\u8fd9\u4e9b\u65b9\u6cd5\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5728\u7f16\u5199\u4e00\u4e9b\u51fd\u6570\u5f0f\u98ce\u683c\u7684\u4ee3\u7801\u65f6\u975e\u5e38\u6709\u7528\u3002\u8ba9\u6211\u4eec\u5728\u8fd9\u91cc\u8ba8\u8bba\u4e00\u4e0btakeWhile\u5b9e\u7528\u65b9\u6cd5\u3002takeWhile()\u63a5\u53d7\u4e00\u4e2a\u8c13\u8bcd\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u7ed9\u5b9a\u6d41\u503c\u7684\u5b50\u96c6\u6d41\uff0c\u76f4\u5230\u8be5\u8c13\u8bcd\u7b2c\u4e00\u6b21\u8fd4\u56defalse\u4e3a\u6b62\u3002\u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e0d\u6ee1\u8db3\u8be5\u8c13\u8bcd\uff0c\u5b83\u5c06\u8fd4\u56de\u4e00\u4e2a\u7a7a\u7684\u6d41\u3002<\/p>\n
                                                                      jshell> Stream.of(1,2,3,4,5,6,7,8,9,10).takeWhile(i -> i < 5 )\r\n                 .forEach(System.out::println);\r\n1\r\n2\r\n3\r\n4\r\n<\/code><\/pre>\n
                                                                      \u8bf7\u9605\u8bfb\u6211\u539f\u521b\u7684\u6559\u7a0b\u300aJava SE 9: Stream API\u6539\u8fdb\u300b\uff0c\u4e86\u89e3\u66f4\u591a\u5173\u4e8etakeWhile\u548cdropWhile\u65b9\u6cd5\u4ee5\u53ca\u5176\u4ed6\u65b0\u65b9\u6cd5\u7684\u5185\u5bb9\u3002<\/p>\n
                                                                      \u589e\u5f3a\u7684@Deprecated\u6ce8\u89e3<\/h3>\n
                                                                      \u5728Java SE 8\u4ee5\u53ca\u66f4\u65e9\u7684\u7248\u672c\u4e2d\uff0c@Deprecated\u6ce8\u89e3\u53ea\u662f\u4e00\u4e2a\u6ca1\u6709\u4efb\u4f55\u65b9\u6cd5\u7684\u6807\u8bb0\u63a5\u53e3\u3002\u5b83\u7528\u4e8e\u6807\u8bb0\u4e00\u4e2aJava API\uff0c\u53ef\u4ee5\u662f\u7c7b\u3001\u5b57\u6bb5\u3001\u65b9\u6cd5\u3001\u63a5\u53e3\u3001\u6784\u9020\u51fd\u6570\u3001\u679a\u4e3e\u7b49\u3002\u5728Java SE 9\u4e2d\uff0cOracle\u516c\u53f8\u589e\u5f3a\u4e86@Deprecated\u6ce8\u89e3\uff0c\u63d0\u4f9b\u4e86\u6709\u5173\u5df2\u8fc7\u65f6API\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u79cd\u5de5\u5177\u6765\u5206\u6790\u5e94\u7528\u7a0b\u5e8f\u5bf9\u5df2\u8fc7\u65f6API\u7684\u9759\u6001\u4f7f\u7528\u60c5\u51b5\u3002\u4ed6\u4eec\u5411\u8fd9\u4e2aDeprecated\u63a5\u53e3\u6dfb\u52a0\u4e86\u4e24\u4e2a\u65b9\u6cd5\uff1aforRemoval\u548csince\uff0c\u4ee5\u63d0\u4f9b\u6b64\u4fe1\u606f\u3002<\/p>\n
                                                                      HTTP 2 \u5ba2\u6237\u7aef<\/h3>\n
                                                                      \u5728Java SE 9\u4e2d\uff0cOracle Corp\u5c06\u53d1\u5e03\u65b0\u7684HTTP 2 Client API\uff0c\u4ee5\u652f\u6301HTTP\/2\u534f\u8bae\u548cWebSocket\u529f\u80fd\u3002\u7531\u4e8e\u73b0\u6709\u7684\u6216\u4f20\u7edf\u7684HTTP Client API\u5b58\u5728\u8bb8\u591a\u95ee\u9898\uff08\u4f8b\u5982\uff0c\u652f\u6301HTTP\/1.1\u534f\u8bae\uff0c\u4e0d\u652f\u6301HTTP\/2\u534f\u8bae\u548cWebSocket\uff0c\u4ec5\u4ee5\u963b\u585e\u6a21\u5f0f\u5de5\u4f5c\u4e14\u6027\u80fd\u95ee\u9898\u5f88\u591a\uff09\uff0c\u4ed6\u4eec\u6253\u7b97\u7528\u65b0\u7684HTTP Client\u66ff\u6362\u8fd9\u4e2aHttpURLConnection API\u3002\u4ed6\u4eec\u5c06\u5728”java.net.http”\u5305\u4e0b\u5f15\u5165\u4e00\u4e2a\u65b0\u7684HTTP 2 Client API\u3002\u5b83\u652f\u6301HTTP\/1.1\u548cHTTP\/2\u534f\u8bae\u3002\u5b83\u53ef\u4ee5\u652f\u6301\u540c\u6b65\uff08\u963b\u585e\u6a21\u5f0f\uff09\u548c\u5f02\u6b65\u6a21\u5f0f\u3002\u5b83\u4f7f\u7528WebSocket API\u652f\u6301\u5f02\u6b65\u6a21\u5f0f\u3002\u6211\u4eec\u53ef\u4ee5\u5728https:\/\/download.java.net\/java\/jdk9\/docs\/api\/java\/net\/http\/package-summary.html\u4e0a\u770b\u5230\u8fd9\u4e2a\u65b0\u7684API\u3002<\/p>\n
                                                                      jshell> import java.net.http.*\r\n\r\njshell> import static java.net.http.HttpRequest.*\r\n\r\njshell> import static java.net.http.HttpResponse.*\r\n\r\njshell> URI uri = new URI(\"https:\/\/rams4java.blogspot.co.uk\/2016\/05\/java-news.html\")\r\nuri ==> https:\/\/rams4java.blogspot.co.uk\/2016\/05\/java-news.html\r\n\r\njshell> HttpResponse response = HttpRequest.create(uri).body(noBody()).GET().response()\r\nresponse ==> java.net.http.HttpResponseImpl@79efed2d\r\n\r\njshell> System.out.println(\"Response was \" + response.body(asString()))\r\n<\/code><\/pre>\n
                                                                      \u8bf7\u4ed4\u7ec6\u9605\u8bfb\u6211\u7684\u539f\u521b\u6559\u7a0b\uff1a\u300aJava SE 9: HTTP 2 Client\u300b\uff0c\u4e86\u89e3HTTP\/2\u534f\u8bae\u548cWebSocket\uff0c\u65b0API\u7684\u4f18\u52bf\u4ee5\u53ca\u65e7API\u7684\u7f3a\u70b9\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e9b\u6709\u7528\u7684\u4f8b\u5b50\u3002<\/p>\n
                                                                      \u591a\u5206\u8fa8\u7387\u56fe\u50cf API<\/h3>\n
                                                                      \u5728Java SE 9\u4e2d\uff0cOracle Corp\u5c06\u5f15\u5165\u4e00\u4e2a\u65b0\u7684\u591a\u5206\u8fa8\u7387\u56fe\u50cfAPI\u3002\u8fd9\u4e2aAPI\u4e2d\u7684\u91cd\u8981\u63a5\u53e3\u662fMultiResolutionImage\u3002\u5b83\u53ef\u5728java.awt.image\u5305\u4e2d\u627e\u5230\u3002MultiResolutionImage\u5c01\u88c5\u4e86\u4e00\u7ec4\u5177\u6709\u4e0d\u540c\u9ad8\u5ea6\u548c\u5bbd\u5ea6\uff08\u5373\u4e0d\u540c\u5206\u8fa8\u7387\uff09\u7684\u56fe\u50cf\uff0c\u5e76\u5141\u8bb8\u6211\u4eec\u6839\u636e\u9700\u6c42\u8fdb\u884c\u67e5\u8be2\u3002<\/p>\n
                                                                      Java 9\u7684\u5176\u4ed6\u529f\u80fd<\/h3>\n
                                                                      \u5728\u8fd9\u4e2a\u90e8\u5206\uff0c\u6211\u53ea\u4f1a\u5217\u51fa\u4e00\u4e9b\u6742\u9879\u7684Java SE 9\u65b0\u7279\u6027\u3002\u6211\u5e76\u4e0d\u662f\u8bf4\u8fd9\u4e9b\u7279\u6027\u4e0d\u91cd\u8981\u3002\u5b83\u4eec\u4e5f\u5f88\u91cd\u8981\uff0c\u800c\u4e14\u901a\u8fc7\u4e00\u4e9b\u6709\u7528\u7684\u4f8b\u5b50\u6df1\u5165\u4e86\u89e3\u5b83\u4eec\u975e\u5e38\u6709\u7528\u3002\u76ee\u524d\u4e3a\u6b62\uff0c\u6211\u8fd8\u6ca1\u6709\u8db3\u591f\u7684\u5173\u4e8e\u8fd9\u4e9b\u7279\u6027\u7684\u4fe1\u606f\u3002\u6240\u4ee5\u6211\u5c06\u5728\u8fd9\u91cc\u5217\u51fa\u5b83\u4eec\u4ee5\u4fbf\u7b80\u5355\u5730\u4e86\u89e3\u3002\u6211\u5c06\u9010\u4e00\u9009\u62e9\u8fd9\u4e9b\u7279\u6027\uff0c\u5e76\u5728\u4e0a\u9762\u7684\u90e8\u5206\u8fdb\u884c\u7b80\u5355\u8ba8\u8bba\u548c\u793a\u4f8b\u3002\u6700\u540e\u4f1a\u518d\u5199\u4e00\u4e2a\u5355\u72ec\u7684\u6559\u7a0b\u3002<\/p>\n
                                                                        \n
                                                                      • \u5783\u573e\u56de\u6536\u5668 (GC) \u6539\u8fdb (Garbage Collector Improvements)<\/li>\n
                                                                      • \u6808\u904d\u5386 API (Stack-Walking API)<\/li>\n
                                                                      • \u8fc7\u6ee4\u4f20\u5165\u7684\u5e8f\u5217\u5316\u6570\u636e (Filter Incoming Serialization Data)<\/li>\n
                                                                      • \u5f03\u7528 Applet API (Deprecate the Applet API)<\/li>\n
                                                                      • \u5b57\u7b26\u4e32\u8fde\u63a5\u4f18\u5316 (Indify String Concatenation)<\/li>\n
                                                                      • \u589e\u5f3a\u7684\u65b9\u6cd5\u53e5\u67c4 (Enhanced Method Handles)<\/li>\n
                                                                      • Java\u5e73\u53f0\u65e5\u5fd7\u8bb0\u5f55API\u548c\u670d\u52a1 (Java Platform Logging API and Service)<\/li>\n
                                                                      • \u7d27\u51d1\u5b57\u7b26\u4e32 (Compact Strings)<\/li>\n
                                                                      • Nashorn\u7684\u89e3\u6790\u5668API (Parser API for Nashorn)<\/li>\n
                                                                      • Javadoc\u641c\u7d22 (Javadoc Search)<\/li>\n
                                                                      • HTML5 Javadoc<\/li>\n<\/ul>\n
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