{"id":31243,"date":"2023-10-05T22:49:34","date_gmt":"2023-11-24T15:21:49","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java-11%e6%97%b6%e4%bb%a3%e7%9a%84java%e7%bc%96%e7%a8%8b%e9%a3%8e%e6%a0%bc%e6%8c%87%e5%8d%97\/"},"modified":"2025-08-12T23:01:46","modified_gmt":"2025-08-12T15:01:46","slug":"%e5%9c%a8java-11%e6%97%b6%e4%bb%a3%e7%9a%84java%e7%bc%96%e7%a8%8b%e9%a3%8e%e6%a0%bc%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java-11%e6%97%b6%e4%bb%a3%e7%9a%84java%e7%bc%96%e7%a8%8b%e9%a3%8e%e6%a0%bc%e6%8c%87%e5%8d%97\/","title":{"rendered":"\u5728Java 11\u65f6\u4ee3\u7684Java\u7f16\u7a0b\u98ce\u683c\u6307\u5357"},"content":{"rendered":"

Java\u7684\u53d1\u5e03\u5468\u671f\u5df2\u7ecf\u6539\u53d8\uff0c\u622a\u81f32019\u5e741\u6708\uff0c\u6700\u65b0\u7248\u672c\u662fJava 11\u3002\u5728\u8bed\u6cd5\u65b9\u9762\u4e5f\u6709\u6240\u6539\u8fdb\uff0c\u73b0\u5728\u53ef\u4ee5\u770b\u5230\u73b0\u4ee3Java\u7684\u98ce\u683c\u6b63\u5728\u53d1\u751f\u53d8\u5316\u3002\u672c\u6587\u5c06\u603b\u7ed3Java 11\u65f6\u4ee3\u73b0\u4ee3\u5316\u7684Java\u7f16\u7a0b\u98ce\u683c\u3002<\/p>\n

\u7531\u4e8e\u672c\u6587\u5305\u542b\u7b14\u8005\u7684\u4e3b\u89c2\u89c2\u70b9\uff0c\u8bf7\u60a8\u6ce8\u610f\u8fd9\u4e00\u70b9\u3002<\/p>\n

var\uff08\u672c\u5730\u53d8\u91cf\u7c7b\u578b\u63a8\u65ad\uff09var \u3092\u7a4d\u6975\u7684\u306b\u5229\u7528\u3059\u308b\u3002<\/p>\n

\u5728Java 10\u4e2d\u5f15\u5165\u4e86var\u6765\u58f0\u660e\u5c40\u90e8\u53d8\u91cf\u7684\u7c7b\u578b\uff0c\u4f46\u57fa\u672c\u4e0a\u53ef\u4ee5\u79ef\u6781\u5730\u5728\u53ef\u4f7f\u7528\u7684\u573a\u666f\u4e2d\u4f7f\u7528\u5b83\u3002\u8bb8\u591a\u73b0\u4ee3\u8bed\u8a00\u90fd\u91c7\u7528\u4e86\u7c7b\u4f3c\u7684\u7c7b\u578b\u63a8\u65ad\uff0c\u4f46\u4ece\u672a\u542c\u8bf4\u8fc7\u7531\u6b64\u5f15\u8d77\u7684\u95ee\u9898\u3002<\/p>\n

\u5bf9\u4e8e\u7ecf\u8fc7\u9ad8\u5ea6\u57f9\u8bad\u7684Java\u7a0b\u5e8f\u5458\u6765\u8bf4\uff0c\u4e00\u8fb9\u578b\u5b9a\u4e49\u7b49IDE\u4f1a\u81ea\u52a8\u8865\u5168\uff0c\u6240\u4ee5\u5bf9\u4e8e\u89c9\u5f97\u4e0d\u65b9\u4fbf\u7684\u610f\u89c1\u6709\u4e00\u5b9a\u9053\u7406\uff0c\u4f46\u4ec5\u5728\u9605\u8bfb\u4ee3\u7801\u65f6\uff0cJava\u5de6\u8fb9\u7684\u5b57\u7b26\u6570\u91cf\u8fc7\u591a\u5bfc\u81f4\u53ef\u8bfb\u6027\u4e25\u91cd\u964d\u4f4e\uff0c\u663e\u5f97\u5197\u957f\u3002<\/p>\n

\/\/ before<\/span>\r\nOwner<\/span> owner<\/span> =<\/span> new<\/span> Owner<\/span>();<\/span>\r\nList<\/span><<\/span>Pet<\/span>><\/span> pets<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>new<\/span> Pet<\/span>(<\/span>\"pochi\"<\/span>),<\/span> new<\/span> Pet<\/span>(<\/span>\"tama\"<\/span>));<\/span>\r\n\r\n\/\/ after<\/span>\r\nvar<\/span> owner<\/span> =<\/span> new<\/span> Owner<\/span>();<\/span>\r\nvar<\/span> pets<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>new<\/span> Pet<\/span>(<\/span>\"pochi\"<\/span>),<\/span> new<\/span> Pet<\/span>(<\/span>\"tama\"<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\u5e76\u6ca1\u6709\u4ec0\u4e48\u5927\u4e0d\u4e86\u7684\u95ee\u9898\uff0c\u4f46\u662f\u8003\u8651\u5230\u5305\u62ec\u6cdb\u578b\u5728\u5185\uff0cJava\u7c7b\u540d\u5f80\u5f80\u4f1a\u53d8\u5f97\u5f88\u957f\uff0c\u6240\u4ee5\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\u4f7f\u7528”var”\u5173\u952e\u5b57\u53ef\u4ee5\u51cf\u5c11\u4fe1\u606f\u91cf\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u6613\u8bfb\u3002<\/p>\n
\u96c6\u5408\u64cd\u4f5c<\/p>\n
\u4e0d\u53ef\u4fee\u6539\u7684 (b\u00f9 k\u011b xi\u016b de)<\/p>\n
    \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u5909\u66f4\u4e0d\u53ef\u80fd\u306b\u3067\u304d\u308b\u7b87\u6240\u3067\u306f\u3067\u304d\u308b\u3060\u3051\u5909\u66f4\u4e0d\u53ef\u80fd\u306b\u3059\u308b\u3002<\/ul>\n
    \u5728Java\u7684\u6807\u51c6\u96c6\u5408\u5e93\u4e2d\uff0c\u6ca1\u6709\u540d\u4e3aImmutableList\u7684\u8868\u793a\u4e0d\u53ef\u53d8\u6027\u7684\u63a5\u53e3\uff0c\u4f46\u662f\u53ef\u4ee5\u901a\u8fc7\u5728\u5c1d\u8bd5\u4fee\u6539\u5143\u7d20\u65f6\u5f15\u53d1\u5f02\u5e38\u6765\u5b9e\u73b0\u963b\u6b62\u53d8\u66f4\u7684\u529f\u80fd\u3002\u4e3a\u4e86\u9632\u6b62\u610f\u5916\u66f4\u6539\u5143\u7d20\uff0c\u6700\u597d\u5c06\u53ef\u4ee5\u53d8\u66f4\u4e0d\u53ef\u7684\u90e8\u5206\u5c3d\u53ef\u80fd\u5730\u8bbe\u7f6e\u4e3a\u4e0d\u53ef\u53d8\u3002<\/p>\n
    \/\/ Java 9 \u3067\u8ffd\u52a0\u3055\u308c\u305f\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u306f\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3059\u308b<\/span>\r\nList<\/span>.<\/span>of<\/span>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span> \/\/ unmodifiable<\/span>\r\nSet<\/span>.<\/span>of<\/span>(<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>);<\/span> \/\/ unmodifiable<\/span>\r\nMap<\/span>.<\/span>of<\/span>(<\/span>\"keyA\"<\/span>,<\/span> \"valueA\"<\/span>,<\/span> \"keyB\"<\/span>,<\/span> \"ValueB\"<\/span>);<\/span> \/\/ unmodifiable<\/span>\r\n\r\n\/\/ Collections \u30af\u30e9\u30b9\u306b\u306f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u30d3\u30e5\u30fc\u3092\u8fd4\u3059\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u3002<\/span>\r\nCollections<\/span>.<\/span>unmodifiableList<\/span>(<\/span>modifiableList<\/span>);<\/span> \/\/ unmodifiable<\/span>\r\n\r\n\/\/ Java 10 \u3067\u8ffd\u52a0\u3055\u308c\u305f\u30d5\u30a1\u30af\u30c8\u30ea\u30fc\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u3082\u65e2\u5b58\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u30d3\u30e5\u30fc\u3092\u4f5c\u6210\u53ef\u80fd<\/span>\r\nList<\/span>.<\/span>copyOf<\/span>(<\/span>modifiableList<\/span>);<\/span> \/\/ unmodifiable<\/span>\r\n\r\n\/\/ Java 10 \u3067\u306f Stream \u306e Collector \u3068\u3057\u3066\u5909\u66f4\u4e0d\u53ef\u80fd\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u5909\u63db\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u308b<\/span>\r\nmodifiableList<\/span>.<\/span>stream<\/span>().<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toUnmodifiableList<\/span>());<\/span>\r\n<\/code><\/pre>\n
    \u6d41API<\/p>\n
      \u6975\u529b for \u6587\u3092\u4f7f\u7528\u305b\u305a\u3001Stream API \u306b\u3088\u3063\u3066\u51e6\u7406\u3059\u308b\u3002<\/ul>\n
      \u7531\u4e8e Java 8 \u5f15\u5165\u4e86 Stream API\uff0cfor \u5faa\u73af\u7684\u4f7f\u7528\u673a\u4f1a\u51e0\u4e4e\u6d88\u5931\u4e86\u3002 Stream API \u7684\u58f0\u660e\u6027\u63cf\u8ff0\u4f7f\u5f97\u4ee3\u7801\u53ef\u8bfb\u6027\u9ad8\uff0c\u800c\u4e14\u4ece\u6027\u80fd\u89d2\u5ea6\u6765\u770b\u4e5f\u66f4\u4f18\u79c0\uff0c\u56e0\u6b64\u9664\u4e86\u4e00\u4e9b\u7279\u6b8a\u60c5\u51b5\uff0c\u6700\u597d\u4f7f\u7528 Stream API \u6765\u8fdb\u884c\u96c6\u5408\u64cd\u4f5c\u3002<\/p>\n
      var<\/span> beforeList<\/span> =<\/span> List<\/span>.<\/span>of<\/span>(<\/span>\"a\"<\/span>,<\/span> \"b\"<\/span>,<\/span> \"c\"<\/span>);<\/span>\r\n\r\n\/\/ before<\/span>\r\nvar<\/span> afterList1<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>String<\/span>>();<\/span>\r\nfor<\/span> (<\/span>var<\/span> str<\/span> :<\/span> beforeList<\/span>)<\/span> {<\/span>\r\n  afterList<\/span>.<\/span>add<\/span>(<\/span>str<\/span>.<\/span>toUpperCase<\/span>());<\/span>\r\n}<\/span>\r\n\r\n\/\/ after<\/span>\r\nvar<\/span> afterList2<\/span> =<\/span> beforeList<\/span>\r\n    .<\/span>stream<\/span>()<\/span>\r\n    .<\/span>map<\/span>(<\/span>String:<\/span>:<\/span>toUpperCase<\/span>)<\/span>\r\n    .<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>toList<\/span>());<\/span>\r\n<\/code><\/pre>\n
      \u7a7a<\/p>\n
      \u8bf7\u63d0\u4f9b\u4ee5\u4e0b\u7684\u4e00\u4e2a\u9009\u9879\u7684\u4e2d\u6587\u672c\u5730\u5316\u7684\u91ca\u4e49\u3002<\/p>\n
        \u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u3066 null \u304c\u8fd4\u308a\u5f97\u308b\u5834\u5408\u306f\u3001Optional \u578b\u3068\u3057\u3066\u8fd4\u3059\u3002<\/ul>\n
        \u5728Java 8\u4e2d\uff0c\u6dfb\u52a0\u4e86Optional\u7c7b\u578b\u6765\u8868\u793a\u53ef\u80fd\u4e3anull\u7684\u503c\u3002\u6ca1\u6709\u7406\u7531\u4e0d\u4f7f\u7528\u5b83\uff0c\u6240\u4ee5\u5728\u53ef\u80fd\u8fd4\u56denull\u7684\u60c5\u51b5\u4e0b\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u8fd4\u56denull\uff0c\u5e94\u59cb\u7ec8\u5c06\u5176\u4f5c\u4e3aOptional\u7c7b\u578b\u8fd4\u56de\u3002<\/p>\n
        Optional<\/span><<\/span>String<\/span>><\/span> getName<\/span>()<\/span> {<\/span>\r\n    return<\/span> Optional<\/span>.<\/span>ofNullable<\/span>(<\/span>this<\/span>.<\/span>name<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u7531\u4e8eOptional\u7c7b\u578b\u4f3c\u4e4e\u4e3b\u8981\u7528\u4f5c\u65b9\u6cd5\u8fd4\u56de\u503c\uff0c\u6240\u4ee5\u6700\u597d\u5728\u65b9\u6cd5\u7684\u53c2\u6570\u6216\u5b57\u6bb5\u4e2d\u57fa\u672c\u4e0a\u4e0d\u4f7f\u7528\u5b83\u3002<\/p>\n
        \u53ef\u4e3a\u7a7a (K\u011b .null \u53ef\u5426\u3092\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u8868\u73fe\u3059\u308b\u3002<\/p>\n
        Kotlin\u7684\u4f18\u52bf\u4e4b\u4e00\u7ecf\u5e38\u88ab\u63d0\u53ca\u7684\u662f\u5b83\u7684\u7a7a\u5b89\u5168\u6027\uff0c\u4f46\u662f\u5728Java\u4e2d\uff0c\u4e5f\u6709\u4e00\u79cd\u90e8\u5206\u5b9e\u73b0\u8fd9\u4e00\u673a\u5236\u7684\u673a\u5236\uff0c\u5373\u901a\u8fc7\u6ce8\u89e3\u58f0\u660e\u53ef\u80fd\u4e3a\u7a7a\u3002\u5c3d\u7ba1\u8be5\u673a\u5236\u6ca1\u6709\u4f5c\u4e3aJava\u7684\u6807\u51c6\u529f\u80fd\u88ab\u91c7\u7528\uff0c\u4f46\u5b83\u662f\u4e00\u79cd\u88ab\u5e7f\u6cdb\u4f7f\u7528\u7684\u673a\u5236\uff0c\u9700\u8981\u5f15\u5165\u67d0\u4e9b\u7b2c\u4e09\u65b9\u5e93\u6765\u5b9e\u73b0\u3002<\/p>\n
        \u5982\u679c\u4f7f\u7528Spring Framework 5\u63d0\u4f9b\u7684\u6ce8\u89e3\uff0c\u5219\u53ef\u4ee5\u5b9e\u73b0\u4ee5\u4e0b\u8868\u8fbe\u65b9\u5f0f\u3002<\/p>\n
        public<\/span> @Nullable<\/span> Pet<\/span> getPetByName<\/span>(<\/span>@NonNull<\/span> String<\/span> name<\/span>)<\/span> {<\/span>\r\n    \/\/ \u5f15\u6570 name \u306b\u306f null \u3092\u6e21\u3057\u3066\u306f\u306a\u3089\u306a\u3044<\/span>\r\n    \/\/ \u8fd4\u308a\u5024 Pet \u306f null \u306b\u306a\u308a\u3046\u308b\uff08\u901a\u5e38\u306f Optional<Pet> \u3068\u3059\u308b\u307b\u3046\u304c\u3088\u3044\uff09<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \"j1WaTnvg.png\"\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u5728\u4f7f\u7528 Kotlin \u8c03\u7528 Java \u4ee3\u7801\u65f6\uff0c\u8fd9\u4e9b\u6ce8\u89e3\u4e5f\u4f1a\u88ab\u5e94\u7528\uff0c\u53ef\u4ee5\u8bc6\u522b\u4e3a\u975e\u7a7a\u7c7b\u578b\uff0c\u8fd9\u662f\u4e00\u4e2a\u597d\u5904\u3002<\/p>\n
          Nullability annotations – Calling Java from Kotlin – Kotlin Programming Language<\/ul>\n
          \u203b\u5177\u4f53\u4f7f\u7528\u54ea\u4e2a\u6ce8\u89e3\u5e93\uff0c\u73b0\u5728\u65e0\u6cd5\u660e\u786e\u65ad\u8a00\u3002\u6211\u8ba4\u4e3a\u76ee\u524d\u88ab\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684\u53ef\u80fd\u662fJSR 305\uff0c\u4f46\u662f\u8fd9\u4e2aJSR\u5904\u4e8e\u505c\u6ede\u72b6\u6001\uff0c\u5e76\u4e14\u672a\u6765\u4e5f\u6ca1\u6709\u63a1\u7528\u7684\u8ba1\u5212\uff0c\u4ece\u8bb8\u53ef\u8bc1\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u4e5f\u4e0d\u63a8\u8350\u4f7f\u7528\u3002\u6211\u8ba4\u4e3aChecker Framework\u53ef\u80fd\u662f\u4e00\u4e2a\u6709\u529b\u7684\u9009\u62e9\uff0c\u4f46\u8fd8\u6709\u5176\u4ed6\u9009\u62e9\uff0c\u56e0\u6b64\u9700\u8981\u8fdb\u884c\u591a\u65b9\u6bd4\u8f83\u6765\u51b3\u5b9a\u4f7f\u7528\u54ea\u4e2a\u3002<\/p>\n
          \u53c2\u8003\u94fe\u63a5\uff1a
          \n– nullpointerexception – \u5728Java\u4e2d\u5e94\u8be5\u4f7f\u7528\u54ea\u4e2a@NotNull\u6ce8\u89e3\uff1f – Stack Overflow
          \n– https:\/\/qiita.com\/ptiringo\/items\/71c2792e7c553399c2e2#comment-b7026b640ba564ba7b2d<\/p>\n
          \u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u4e3a null<\/p>\n
            \u30e1\u30bd\u30c3\u30c9\u306e null \u975e\u8a31\u5bb9\u306a\u5f15\u6570\u306f Objects.requireNonNull \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u65e9\u3044\u30bf\u30a4\u30df\u30f3\u30b0\u3067 null \u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u3002<\/ul>\n
            \u4f7f\u7528\u8868\u793a\u7a7a\u503c\u80fd\u529b\u7684\u6ce8\u91ca\u53ef\u4ee5\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u9632\u6b62\u7a7a\u503c\u7684\u6df7\u5165\uff0c\u4f46\u5b83\u53ea\u662f\u9759\u6001\u5206\u6790\uff0c\u5728\u8fd0\u884c\u65f6\u65e0\u80fd\u4e3a\u529b\u3002\u4e3a\u4e86\u65e9\u671f\u68c0\u6d4b\u8fd0\u884c\u65f6\u7684\u7a7a\u503c\u6df7\u5165\uff0c\u6700\u7ec8\u8fd8\u662f\u9700\u8981\u5728\u65b9\u6cd5\u5185\u90e8\u8fdb\u884c\u7a7a\u503c\u68c0\u67e5\u3002<\/p>\n
            \u4f7f\u7528Java 7\u5f15\u5165\u7684Objects.requireNonNull\u65b9\u6cd5\u53ef\u4ee5\u7b80\u6d01\u5730\u8fdb\u884c\u7a7a\u503c\u68c0\u67e5\uff0c\u5efa\u8bae\u79ef\u6781\u4f7f\u7528\u6b64\u65b9\u6cd5\u3002<\/p>\n
            Pet<\/span>(<\/span>@NonNull<\/span> String<\/span> name<\/span>,<\/span> @NonNull<\/span> LocalDate<\/span> birthdate<\/span>)<\/span> {<\/span>\r\n    this<\/span>.<\/span>name<\/span> =<\/span> Objects<\/span>.<\/span>requireNonNull<\/span>(<\/span>name<\/span>);<\/span>\r\n    this<\/span>.<\/span>birthdate<\/span> =<\/span> Objects<\/span>.<\/span>requireNonNull<\/span>(<\/span>birthdate<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \"aaa\"<\/p>\n
            \u81ea\u52a8\u8d44\u6e90\u7ba1\u7406<\/p>\n
              \u30ea\u30bd\u30fc\u30b9\u306e\u30af\u30ed\u30fc\u30ba\u51e6\u7406\u304c\u5fc5\u8981\u306a\u7b87\u6240\u3067\u306f\u5e38\u306b try-with-resources \u3092\u4f7f\u3046\u3002<\/ul>\n
              Java 7 \u63a8\u51fa\u4e86 try-with-resource \u673a\u5236\uff0c\u4f7f\u5f97\u8d44\u6e90\u7684\u5173\u95ed\u5904\u7406\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u3002\u5bf9\u4e8e\u50cf\u6570\u636e\u5e93\u8fde\u63a5\u7b49\u65e0\u8bba\u6210\u529f\u8fd8\u662f\u5931\u8d25\u90fd\u5fc5\u987b\u8fdb\u884c\u5173\u95ed\u5904\u7406\u7684\u8d44\u6e90\uff0c\u5efa\u8bae\u59cb\u7ec8\u4f7f\u7528 try-with-resource \u673a\u5236\u6765\u8fdb\u884c\u5173\u95ed\u5904\u7406\u3002<\/p>\n
              \/\/ before<\/span>\r\nFileInputStream<\/span> inputStream1<\/span> =<\/span> null<\/span>;<\/span>\r\ntry<\/span> {<\/span>\r\n  inputStream1<\/span> =<\/span> new<\/span> FileInputStream<\/span>(<\/span>\"foo.txt\"<\/span>);<\/span>\r\n  inputStream1<\/span>.<\/span>read<\/span>();<\/span>\r\n}<\/span> finally<\/span> {<\/span>\r\n  if<\/span> (<\/span>inputStream1<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\r\n    try<\/span> {<\/span>\r\n      inputStream1<\/span>.<\/span>close<\/span>();<\/span>\r\n    }<\/span> catch<\/span> (<\/span>Exception<\/span> e<\/span>)<\/span> {<\/span>\r\n      e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\n\/\/ after<\/span>\r\ntry<\/span> (<\/span>var<\/span> inputStream2<\/span> =<\/span> Files<\/span>.<\/span>newInputStream<\/span>(<\/span>Path<\/span>.<\/span>of<\/span>(<\/span>\"foo.txt\"<\/span>)))<\/span> {<\/span>\r\n  inputStream2<\/span>.<\/span>read<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
              \u65e5\u671f\u4e0e\u65f6\u95f4<\/p>\n
                \n
              • \n
                  Date and Time API \u3092\u4f7f\u3046\u3002<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    Date \u30af\u30e9\u30b9\u3084 Calendar \u30af\u30e9\u30b9\u3001SimpleDateFormat \u30af\u30e9\u30b9\u306a\u3069\u306e\u65e7\u30af\u30e9\u30b9\u7fa4\u306f\u7279\u5225\u306a\u7406\u7531\u304c\u306a\u3044\u9650\u308a\u4f7f\u7528\u3057\u306a\u3044\u3002<\/ul>\n
                    \u5728Java 8\u4e2d\u5f15\u5165\u7684\u65e5\u671f\u548c\u65f6\u95f4API\u4f7f\u5f97\u51e0\u4e4e\u53ef\u4ee5\u5168\u90e8\u66ff\u4ee3\u65e7\u7684Date\u7c7b\u3001Calendar\u7c7b\u548cSimpleDateFormatter\u7c7b\u3002\u9664\u975e\u6709\u7279\u6b8a\u7684\u7406\u7531\uff0c\u6700\u597d\u4e0d\u8981\u4f7f\u7528\u65e7\u7684\u7c7b\u3002<\/p>\n
                    \/\/ before<\/span>\r\nvar<\/span> date<\/span> =<\/span> new<\/span> Date<\/span>();<\/span>\r\nvar<\/span> simpleDateFormat<\/span> =<\/span> new<\/span> SimpleDateFormat<\/span>(<\/span>\"yyyy\/MM\/dd\"<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>simpleDateFormat<\/span>.<\/span>format<\/span>(<\/span>date<\/span>));<\/span>\r\n\r\n\/\/ after<\/span>\r\nvar<\/span> localDate<\/span> =<\/span> LocalDate<\/span>.<\/span>now<\/span>();<\/span>\r\nvar<\/span> dateTimeFormatter<\/span> =<\/span> DateTimeFormatter<\/span>.<\/span>ofPattern<\/span>(<\/span>\"yyyy\/MM\/dd\"<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>dateTimeFormatter<\/span>.<\/span>format<\/span>(<\/span>localDate<\/span>));<\/span>\r\n<\/code><\/pre>\n
                    \u53ef\u4ee5\u8bf4\uff0c\u50cfJoda-Time\u8fd9\u6837\u7684\u5e93\u5df2\u7ecf\u53d1\u6325\u4e86\u4f5c\u7528\uff0c\u4ee5\u89e3\u51b3\u65e7\u6709\u7c7b\u7fa4\u7684\u4f7f\u7528\u4e0d\u4fbf\u95ee\u9898\u3002<\/p>\n
                      Date and Time API \u5fa9\u7fd2 – Qiita<\/ul>\n
                      \u6587\u4ef6\u64cd\u4f5cjava.io \u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u30af\u30e9\u30b9 (Java I\/O) \u3088\u308a\u3082 java.nio.file \u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u30af\u30e9\u30b9 (NIO2) \u3092\u512a\u5148\u7684\u306b\u4f7f\u7528\u3059\u308b\u3002<\/p>\n
                      Java 7 \u5f15\u5165\u7684 NIO2 \u5df2\u7ecf\u8ba9 Java \u7684\u6587\u4ef6\u64cd\u4f5c API \u53d8\u5f97\u66f4\u65b0\u3002\u57fa\u672c\u4e0a\uff0c\u6700\u597d\u9075\u5faa\u4f7f\u7528\u65b0\u7684 API \u800c\u5c3d\u91cf\u4e0d\u4f7f\u7528\u65e7\u7684 API \u7684\u65b9\u6cd5\u3002<\/p>\n
                      \/\/ before<\/span>\r\nvar<\/span> dir<\/span> =<\/span> new<\/span> File<\/span>(<\/span>\"\/tmp\/dir\"<\/span>);<\/span>\r\nvar<\/span> succeeded<\/span> =<\/span> dir<\/span>.<\/span>mkdir<\/span>();<\/span>\r\nif<\/span> (<\/span>succeeded<\/span>)<\/span> {<\/span>\r\n  try<\/span> {<\/span>\r\n    new<\/span> File<\/span>(<\/span>dir<\/span>,<\/span> \"foo.txt\"<\/span>).<\/span>createNewFile<\/span>();<\/span>\r\n  }<\/span> catch<\/span> (<\/span>IOException<\/span> e<\/span>)<\/span> {<\/span>\r\n    e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\n\/\/ after<\/span>\r\ntry<\/span> {<\/span>\r\n  var<\/span> directory<\/span> =<\/span> Files<\/span>.<\/span>createDirectory<\/span>(<\/span>Path<\/span>.<\/span>of<\/span>(<\/span>\"\/tmp\/dir2\"<\/span>));<\/span>\r\n  Files<\/span>.<\/span>createFile<\/span>(<\/span>directory<\/span>.<\/span>resolve<\/span>(<\/span>\"foo.txt\"<\/span>));<\/span>\r\n}<\/span> catch<\/span> (<\/span>IOException<\/span> e<\/span>)<\/span> {<\/span>\r\n  e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                      \u5c3d\u91cf\u4f7f\u7528 Path.of(..) \u548c Files.xxx\uff0c\u800c\u4e0d\u8981\u4f7f\u7528 new File(..)\u3002<\/p>\n
                        \n
                      • \n
                          Java NIO2 \u306e\u304a\u3055\u3089\u3044\u30e1\u30e2 – Qiita<\/ul>\n<\/li>\n<\/ul>\n
                           <\/p>\n
                            java.io.File \u306e\u30b3\u30fc\u30c9\u3092 java.nio.Path \u3068 java.nio.Files \u3092\u4f7f\u3063\u3066\u66f8\u304d\u76f4\u3059 – Qiita<\/ul>\n
                            \u6a21\u5757\u6309\u7167\u7406\u89e3\u7684\u7a0b\u5ea6\u8fdb\u884c\u8865\u5145\u8bb0\u5f55\u2026\u2026\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                            Java\u7684\u53d1\u5e03\u5468\u671f\u5df2\u7ecf\u6539\u53d8\uff0c\u622a\u81f32019\u5e741\u6708\uff0c\u6700\u65b0\u7248\u672c\u662fJava 11\u3002\u5728\u8bed\u6cd5\u65b9\u9762\u4e5f\u6709\u6240\u6539\u8fdb\uff0c\u73b0\u5728\u53ef\u4ee5\u770b\u5230\u73b0 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31243","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\n\u5728Java 11\u65f6\u4ee3\u7684Java\u7f16\u7a0b\u98ce\u683c\u6307\u5357 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5728Java 11\u65f6\u4ee3\u7684Java\u7f16\u7a0b\u98ce\u683c\u6307\u5357\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java-11\u65f6\u4ee3\u7684java\u7f16\u7a0b\u98ce\u683c\u6307\u5357\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5728Java 11\u65f6\u4ee3\u7684Java\u7f16\u7a0b\u98ce\u683c\u6307\u5357\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u5728Java 11\u65f6\u4ee3\u7684Java\u7f16\u7a0b\u98ce\u683c\u6307\u5357\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java-11\u65f6\u4ee3\u7684java\u7f16\u7a0b\u98ce\u683c\u6307\u5357\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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