{"id":31016,"date":"2022-12-08T03:29:58","date_gmt":"2023-01-06T22:09:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java8%e5%88%b0java11%e7%9a%84%e6%9b%b4%e6%94%b9%e7%82%b9\/"},"modified":"2025-08-12T21:53:00","modified_gmt":"2025-08-12T13:53:00","slug":"java8%e5%88%b0java11%e7%9a%84%e6%9b%b4%e6%94%b9%e7%82%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java8%e5%88%b0java11%e7%9a%84%e6%9b%b4%e6%94%b9%e7%82%b9\/","title":{"rendered":"Java8\u5230Java11\u7684\u66f4\u6539\u70b9"},"content":{"rendered":"<h1>\u4eceJava 8\u5347\u7ea7\u81f3Java 11http:\/\/openjdk.java.net\/projects\/jdk9\/<br \/>\nhttp:\/\/cr.openjdk.java.net\/~iris\/se\/9\/latestSpec\/apidiffs\/overview-summary.html<\/p>\n<p>\u4ee5\u4e0b\u662f\u76f8\u5173\u7f51\u7ad9\u7684\u94fe\u63a5\uff1a<br \/>\nhttp:\/\/openjdk.java.net\/projects\/jdk9\/<br \/>\nhttp:\/\/cr.openjdk.java.net\/~iris\/se\/9\/latestSpec\/apidiffs\/overview-summary.html<\/p>\n<p>https:\/\/openjdk.java.net\/projects\/jdk\/10\/ \uff1a\u5728\u8fd9\u4e2a\u7f51\u7ad9\u4e0a\uff0c\u4f60\u53ef\u4ee5\u627e\u5230\u6709\u5173Java\u5f00\u53d1\u5de5\u5177\u5305\uff08JDK\uff0910\u7684\u4fe1\u606f\u3002<\/p>\n<p>http:\/\/cr.openjdk.java.net\/~iris\/se\/10\/latestSpec\/apidiffs\/overview-summary.html \uff1a\u8fd9\u4e2a\u94fe\u63a5\u63d0\u4f9b\u4e86Java\u89c4\u8303\u7684\u6700\u65b0\u7248\u672c\uff0c\u8be6\u7ec6\u8bf4\u660e\u4e86JDK 10\u4e2d\u7684API\u5dee\u5f02\u3002<\/p>\n<p>https:\/\/openjdk.java.net\/projects\/jdk\/11\/ \u53ef\u4ee5\u5728\u6b64\u5904\u627e\u5230\u6709\u5173JDK 11\u9879\u76ee\u7684\u4fe1\u606f\u3002<\/p>\n<p>http:\/\/cr.openjdk.java.net\/~iris\/se\/11\/latestSpec\/apidiffs\/overview-summary.html \u662f\u6709\u5173JDK 11\u6700\u65b0\u89c4\u8303\u7684API\u5dee\u5f02\u603b\u89c8\u3002<\/p>\n<h1>\u8bdd\u8bed\u9996\u5148\u662f\u5173\u4e8e\u8bed\u8a00\u7684\u66f4\u6539\u3002<\/p>\n<h2>\u8bf7\u4f7f\u7528\u4e2d\u6587\u539f\u751f\u8bed\u8a00\u7ffb\u8bd1\u4ee5\u4e0b\u5185\u5bb9\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff1avar<\/p>\n<p>\u73b0\u5728\u53ef\u4ee5\u5bf9\u672c\u5730\u53d8\u91cf\u8fdb\u884c\u7c7b\u578b\u63a8\u65ad\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">var<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Foo\"<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<p>\u5173\u4e8e\u6307\u9488\uff0c\u53ef\u80fd\u6709\u4ee5\u4e0b\u7684\u611f\u89c9\u4e0d\u9519\u3002<\/p>\n<p>new\u3001List.of\u306a\u3069\u53f3\u8fba\u306b\u578b\u304c\u3042\u308b\u3082\u306e\u306fvar\u3092\u4f7f\u3046\u65b9\u304c\u3044\u3044(Integer\u3001Long\u306a\u3069\u4ee5\u5916)<\/p>\n<p>java.lang\u3001java.util\u306a\u3069\u306e\u57fa\u672c\u7684\u306a\u30af\u30e9\u30b9\u306b\u306fvar\u3092\u4f7f\u3063\u3066\u3044\u3044<\/p>\n<p>Integer\u3084Long\u306a\u3069\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306f\u6271\u3044\u6ce8\u610f\u306a\u306e\u3067var\u3092\u4f7f\u308f\u306a\u3044\u307b\u3046\u304c\u3044\u3044<br \/>\n\u57fa\u672c\u578b\u306b\u306fvar\u3092\u4f7f\u3063\u3066\u3082\u3044\u3044<br \/>\n\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306b\u306fvar\u3092\u4f7f\u308f\u306a\u3044\u307b\u3046\u304c\u3044\u3044<\/p>\n<p>\u5982\u679c\u4f7f\u7528\u5305\u88c5\u7c7b\u53d8\u91cf\uff0c\u9700\u8981\u5904\u7406null\uff0c\u6240\u4ee5\u6700\u597d\u660e\u786e\u6307\u5b9a\u7c7b\u578b\u3002\u5982\u679c\u4e0d\u4f7f\u7528null\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u57fa\u672c\u7c7b\u578b\u3002<br \/>\n\u5c06\u5176\u5e94\u7528\u4e8e\u9879\u76ee1\uff0c\u5219\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u5199\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">var<\/span> <span class=\"n\">count<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Long<\/span><span class=\"o\">.<\/span><span class=\"na\">valueOf<\/span><span class=\"o\">(<\/span><span class=\"s\">\"123\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u7531\u4e8eInteger\u548cLong\u65b9\u6cd5\u6df7\u5408\u8fd4\u56de\u57fa\u672c\u7c7b\u578b\u548c\u5305\u88c5\u5668\u7c7b\u578b\uff0c\u56e0\u6b64\u6700\u597d\u660e\u786e\u6307\u5b9a\u7c7b\u578b\u4ee5\u786e\u4fdd\u5b89\u5168\u3002\u5982\u679c\u4f7f\u7528var\u63a5\u6536\uff0c\u5219\u6700\u597d\u6307\u5b9a\u4e3a\u57fa\u672c\u7c7b\u578b\u3002<\/p>\n<h2>\u79c1\u6709\u63a5\u53e3\u65b9\u6cd5 (simplified Chinese)\u63a5\u53e3\u73b0\u5728\u53ef\u4ee5\u4f7f\u7528\u79c1\u6709\u65b9\u6cd5\u4e86\u3002<\/p>\n<p>\u7531\u4e8eJava 8\u5f15\u5165\u4e86\u9759\u6001\u65b9\u6cd5\u548c\u9ed8\u8ba4\u65b9\u6cd5\uff0c\u56e0\u6b64\u53ef\u4ee5\u5c06\u516c\u5171\u5904\u7406\u903b\u8f91\u5199\u6210\u79c1\u6709\u65b9\u6cd5\u3002<\/p>\n<h2>\u6709\u6548\u7684try-with-resource\u6700\u7ec8\u5199\u6cd5\u9488\u5bf9\u5b9e\u9645\u4e0a\u662f\u6700\u7ec8\u7684\u53d8\u91cf\uff0c\u73b0\u5728\u53ef\u4ee5\u4f7f\u7528try-with-resource\u4ec5\u6307\u5b9a\u53d8\u91cf\u3002<br \/>\n\u4ee5\u524d\uff0c\u5f53\u5e0c\u671b\u5728try-with-resource\u4e2d\u81ea\u52a8\u5173\u95ed\u5728try\u4e4b\u5916\u5b9a\u4e49\u7684\u53ef\u5173\u95ed\u53d8\u91cf\u65f6\uff0c\u9700\u8981\u5c06\u5176\u8d4b\u503c\u7ed9\u53e6\u4e00\u4e2a\u53d8\u91cf\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5e0c\u671b\u5728finally\u4e2d\u4f7f\u7528\u5b83\uff0c\u5c31\u5fc5\u987b\u5728try\u4e4b\u5916\u5b9a\u4e49\u8be5\u53d8\u91cf\uff0c\u4f46\u662f\u73b0\u5728\u53ef\u4ee5\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">var<\/span> <span class=\"n\">io<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">InputStream<\/span><span class=\"o\">();<\/span>\r\n<span class=\"k\">try<\/span> <span class=\"o\">(<\/span><span class=\"kt\">var<\/span> <span class=\"n\">io2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">io<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"o\">...<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8bf7\u4ee5\u4e2d\u6587\u672c\u5730\u5316\u65b9\u5f0f\u6539\u8ff0\u4ee5\u4e0b\u5185\u5bb9\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a<br \/>\n\u2193<\/p>\n<p>\u8bf7\u7528\u4e2d\u6587\u7b80\u8ff0\u4ee5\u4e0b\u5185\u5bb9\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a<br \/>\n\u2193<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">var<\/span> <span class=\"n\">io<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">InputStream<\/span><span class=\"o\">();<\/span>\r\n<span class=\"k\">try<\/span> <span class=\"o\">(<\/span><span class=\"n\">io<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"o\">...<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5728\u533f\u540d\u4e2d\u73b0\u5728\u53ef\u4ee5\u4f7f\u7528\u94bb\u77f3\u64cd\u4f5c\u7b26\u5728\u533f\u540d\u7c7b\u4e2d\u8fdb\u884c\u7c7b\u578b\u63a8\u65ad\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">strs<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;&gt;()<\/span> <span class=\"o\">{{<\/span>\r\n  <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"s\">\"aa\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"s\">\"bb\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}};<\/span>\r\n<\/code><\/pre>\n<h2>\u4e0d\u53ef\u4f7f\u7528\u73b0\u5728\u65e0\u6cd5\u4f7f\u7528_\u4f5c\u4e3a\u53d8\u91cf\u3002<\/p>\n<h1>\u5e94\u7528\u7f16\u7a0b\u63a5\u53e3 (API)\u4ee5\u4e0b\u662f\u9488\u5bf9\u6bcf\u4e2a\u7c7b\u522b\u7684\u6807\u51c6\u5e93\u66f4\u6539\u8fdb\u884c\u603b\u7ed3\u3002<\/p>\n<p>\u8bf7\u70b9\u51fb\u8fd9\u91cc\u67e5\u770b\u5173\u4e8eJava 11\u7684API\uff1a<br \/>\n<iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" title=\"Java11\u3067\u306eAPI\u5909\u66f4\u3092\u96d1\u306b\u5217\u6319 - \u304d\u3057\u3060\u306eHatena\" src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fnowokay.hatenablog.com%2Fentry%2F20180704%2F1530712754#?secret=k5nLLWlRqm\" data-secret=\"k5nLLWlRqm\" scrolling=\"no\" frameborder=\"0\"><\/iframe><\/p>\n<h2>java.lang\u53ef\u4ee5\u88ab\u89c6\u4e3aJava\u7f16\u7a0b\u8bed\u8a00\u4e2d\u7684\u6838\u5fc3\u5e93\u3002<\/p>\n<h3>\u5b57\u7b26\u4e32<\/p>\n<h4>\u538b\u7f29\u5b57\u7b26\u4e32\u4ee5\u4e0b\u662f\u5bf9Java9\u7684\u539f\u6587\u7684\u4e2d\u6587\u91ca\u4e49\uff1a<\/p>\n<p>\u8fd9\u4e2a\u94fe\u63a5\u63d0\u5230\u4e86Java9\u7684\u4e00\u4e2a\u65b0\u7279\u6027\u3002\u5728Java8\u4e4b\u524d\uff0cJava\u4f7f\u7528UTF-16\u5c06\u5b57\u7b26\u5b58\u50a8\u4e3achar\u578b\uff0c\u6bcf\u4e2a\u5b57\u7b26\u5360\u75282\u4e2a\u5b57\u8282\u3002\u7136\u800c\uff0c\u73b0\u5728\u53ea\u5305\u542bASCII\u5b57\u7b26\uff08\u4f8b\u5982\uff0c\u5b57\u6bcd\u548c\u6570\u5b57\uff09\u7684\u5b57\u7b26\u4e32\u5c06\u53ea\u5360\u75281\u4e2a\u5b57\u8282\u6765\u5b58\u50a8\u3002<\/p>\n<h4>\u62fc\u63a5\u5b57\u7b26\u4e32\u8fc4\u4eca\u4e3a\u6b62\uff0c\u5c06\u5b57\u7b26\u4e32\u8fdb\u884c\u8fde\u63a5\u7684\u64cd\u4f5c\u5728Java\u4e2d\u88ab\u5c55\u5f00\u4e3aStringBuilder\u7c7b\uff0c\u4f46\u901a\u8fc7InvokeDynamic\u6307\u4ee4\uff0c\u5c06\u5728\u8fd0\u884c\u65f6\u786e\u5b9a\u8fde\u63a5\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"s\">\"aa\"<\/span><span class=\"o\">+<\/span> <span class=\"n\">a<\/span>\r\n<\/code><\/pre>\n<p>\u5bf9\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u4e2d\u6587\u672c\u5730\u5316\u91ca\u4e49\uff0c\u53ea\u9700\u4e00\u79cd\u9009\u9879 \uff1a<br \/>\n\u2193<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">new<\/span> <span class=\"nc\">StringBuilder<\/span><span class=\"o\">(<\/span><span class=\"s\">\"aa\"<\/span><span class=\"o\">).<\/span><span class=\"na\">append<\/span><span class=\"o\">(<\/span><span class=\"n\">a<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u52a8\u6001\u8c03\u7528<\/p>\n<h4>\u91cd\u590d(n)\u5faa\u73af\u53ef\u884c<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\".repeat(3)\r\n$1 ==&gt; \"testtesttest\"\r\n<\/code><\/pre>\n<h4>isBlank()\u662f\u7a7a\u7684\u5417\uff1fisBlank\u662f\u6307UTF\u7684\u7a7a\u683c\u5b57\u7b26\u3002<\/p>\n<h4>\u53bb\u9664\u7a7a\u683c \/ \u53bb\u9664\u524d\u5bfc\u7a7a\u683c \/ \u53bb\u9664\u5c3e\u90e8\u7a7a\u683c\u4f7f\u7528UTF\u7f16\u7801\u7684trim() \/ trimLeft() \/ trimRight()\u7684\u672c\u5730\u5316\u7248\u672c<\/p>\n<h4>\u8c03\u6574()<br \/>\n\u8fd4\u56de\u4e00\u4e2a\u6309\u884c\u5206\u5272\u7684\u5b57\u7b26\u4e32Stream\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"s\">\"test\\nprogram\\n\"<\/span><span class=\"o\">.<\/span><span class=\"na\">lines<\/span><span class=\"o\">()<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">map<\/span><span class=\"o\">(<\/span><span class=\"nl\">String:<\/span><span class=\"o\">:<\/span><span class=\"n\">strip<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">collect<\/span><span class=\"o\">(<\/span><span class=\"nc\">Collectors<\/span><span class=\"o\">.<\/span><span class=\"na\">joining<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\\n\"<\/span><span class=\"o\">))<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u6837\u505a\u5c31\u80fd\u53bb\u6389\u6bcf\u884c\u524d\u540e\u7684\u7a7a\u683c\u3002<\/p>\n<h2>java.util \u53ef\u4ee5\u88ab\u91cd\u5199\u4e3a\u201c\u5f3a\u5927\u7684 java \u5de5\u5177\u5305\u201d\u3002<\/p>\n<h3>\u5217\/\u96c6\u5408\/\u6620\u5c04<\/p>\n<h4>\u5173\u4e8e[\u67d0\u4e2a\u4e3b\u9898]\u8fd4\u56de\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u96c6\u5408\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">var<\/span> <span class=\"n\">strs<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">List<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"s\">\"apple\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"banana\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"kt\">var<\/span> <span class=\"n\">sets<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Set<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"s\">\"apple\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"banana\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"kt\">var<\/span> <span class=\"n\">dict<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span>\r\n  <span class=\"s\">\"apple\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u308a\u3093\u3054\"<\/span><span class=\"o\">,<\/span>\r\n  <span class=\"s\">\"banana\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"\u30d0\u30ca\u30ca\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h4>\u590d\u5236\u54c1\u8fd4\u56de\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u526f\u672c<\/p>\n<h3>\u5730\u56fe<\/p>\n<h4>\u63d0\u4f9b\u7684\u9009\u9879\uff1a<br \/>\n1. ofEntries()\uff1a\u901a\u8fc7\u591a\u4e2a\u952e\u503c\u5bf9\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u952e\u503c\u6620\u5c04\uff08Map\uff09\u3002<br \/>\n2. entry()\uff1a\u521b\u5efa\u4e00\u4e2a\u7f6e\u4e8e\u952e\u503c\u6620\u5c04\u4e2d\u7684\u952e\u503c\u5bf9\u3002\u5728Map\u4e2d\u4e0d\u4ec5\u6dfb\u52a0\u4e86of\u65b9\u6cd5 \uff0c\u8fd8\u6dfb\u52a0\u4e86ofEntries\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">static<\/span> <span class=\"n\">java<\/span><span class=\"o\">.<\/span><span class=\"na\">util<\/span><span class=\"o\">.<\/span><span class=\"na\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">entry<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kt\">var<\/span> <span class=\"n\">map<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">ofEntries<\/span><span class=\"o\">(<\/span>\r\n  <span class=\"n\">entry<\/span><span class=\"o\">(<\/span><span class=\"s\">\"key1\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"value1\"<\/span><span class=\"o\">),<\/span>\r\n  <span class=\"n\">entry<\/span><span class=\"o\">(<\/span><span class=\"s\">\"key2\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"value2\"<\/span><span class=\"o\">));<\/span>\r\n<\/code><\/pre>\n<h3>\u8c13\u8bed y\u01d4)\u4e0d\u662f (b\u00fa sh\u00ec)<\/p>\n<p>\u65b9\u6cd5\u5f15\u7528\u7684\u53cd\u8f6c\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">lines<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">()<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">filter<\/span><span class=\"o\">(<\/span><span class=\"n\">not<\/span><span class=\"o\">(<\/span><span class=\"nl\">String:<\/span><span class=\"o\">:<\/span><span class=\"n\">isEmpty<\/span><span class=\"o\">))<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h3>\u6536\u85cf<\/p>\n<h4>\u5c06\u6574\u6570\u51fd\u6570\u4e2d\u7684\u5143\u7d20\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002\u5728\u5c06List\u7b49\u8f6c\u6362\u4e3a\u6570\u7ec4\u65f6\uff0c\u4ee5\u524d\u9700\u8981\u9884\u5148\u51c6\u5907\u4e00\u4e2a\u5927\u5c0f\u76f8\u7b26\u7684\u6570\u7ec4\uff0c\u4f46\u73b0\u5728\u53ef\u4ee5\u4f7f\u7528strs.toArray(String[]::new)\u6765\u751f\u6210\u6570\u7ec4\u3002<\/p>\n<h3>\u6d41<\/p>\n<h4>\u53ea\u8981\u6709\u4e00\u4e2a\u9009\u9879\uff0c\u4ee5\u4e0b\u662f\u5bf9&#8221;dropWhile&#8221;\u548c&#8221;takeWhile&#8221;\u7684\u4e2d\u6587\u7ffb\u8bd1\uff1a<br \/>\n&#8211; dropWhile \uff1a\u4e00\u76f4\u4e22\u5f03<br \/>\n&#8211; takeWhile \uff1a\u4e00\u76f4\u83b7\u53d6<\/p>\n<p>\u5728Java 8\u4e2d\uff0c\u65e0\u6cd5\u5b9e\u73b0\u7c7b\u4f3c\u201c\u4ece\u6570\u636e\u5f00\u59cb\u5230\u7ed3\u675f\u201d\u7684Stream\u5904\u7406\uff0c\u4f46\u662f\u5728Java 9\u4e2d\u5f15\u5165\u4e86dropWhile \/ takeWhile\u529f\u80fd\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8be5\u529f\u80fd\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">jshell<\/span><span class=\"o\">&gt;<\/span> <span class=\"nc\">Stream<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"start\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"end\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"four\"<\/span><span class=\"o\">).<\/span>\r\n   <span class=\"o\">...&gt;<\/span> <span class=\"n\">dropWhile<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">!<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"start\"<\/span><span class=\"o\">)).<\/span>\r\n   <span class=\"o\">...&gt;<\/span> <span class=\"n\">takeWhile<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">!<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"end\"<\/span><span class=\"o\">)).<\/span>\r\n   <span class=\"o\">...&gt;<\/span> <span class=\"n\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">)<\/span>\r\n<span class=\"n\">start<\/span>\r\n<span class=\"n\">two<\/span>\r\n<span class=\"n\">three<\/span>\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u5df2\u7ecf\u5305\u542b\u4e86&#8221;start&#8221;\u8fd9\u4e2a\u8bcd\uff0c\u6240\u4ee5\u9700\u8981\u8df3\u8fc7\u5b83\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">jshell<\/span><span class=\"o\">&gt;<\/span> <span class=\"nc\">Stream<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"s\">\"one\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"start\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"two\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"three\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"end\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"four\"<\/span><span class=\"o\">).<\/span>\r\n   <span class=\"o\">...&gt;<\/span> <span class=\"n\">dropWhile<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">!<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"start\"<\/span><span class=\"o\">)).<\/span>\r\n   <span class=\"o\">...&gt;<\/span> <span class=\"n\">skip<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">).<\/span>\r\n   <span class=\"o\">...&gt;<\/span> <span class=\"n\">takeWhile<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">!<\/span><span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"s\">\"end\"<\/span><span class=\"o\">)).<\/span>\r\n   <span class=\"o\">...&gt;<\/span> <span class=\"n\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">)<\/span>\r\n<span class=\"n\">two<\/span>\r\n<span class=\"n\">three<\/span>\r\n<\/code><\/pre>\n<h4>\u53ef\u4ee5\u4e3a\u7a7a<\/p>\n<h4>\u91cd\u8907\u6267\u884c<br \/>\n\u4eceJava8\u5f00\u59cb\uff0c\u6709\u4e00\u4e2a\u5177\u6709\u4e24\u4e2a\u53c2\u6570\u7684\u8fed\u4ee3\u51fd\u6570\uff0c\u4f46\u5fc5\u987b\u59cb\u7ec8\u4f7f\u7528limit\u7b49\u6761\u4ef6\u6765\u6307\u5b9a\u505c\u6b62\u6761\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">IntStream<\/span><span class=\"o\">.<\/span><span class=\"na\">iterate<\/span><span class=\"o\">(<\/span><span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">3<\/span><span class=\"o\">).<\/span><span class=\"na\">limit<\/span><span class=\"o\">(<\/span><span class=\"mi\">5<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u6ca1\u6709 takeWhile\uff0c\u6240\u4ee5\u4f7f\u7528\u8d77\u6765\u76f8\u5f53\u68d8\u624b\u3002<br \/>\n\u7136\u540e\uff0c\u901a\u8fc7\u7ed3\u5408 takeWhile \u548c iterate\uff0c\u6211\u5b66\u4f1a\u4e86\u5982\u4f55\u4f7f\u7528\u5b83\u3002<br \/>\n\u56e0\u6b64\uff0c\u5b83\u53ef\u4ee5\u50cf for \u5faa\u73af\u4e00\u6837\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">IntStream<\/span><span class=\"o\">.<\/span><span class=\"na\">iterate<\/span><span class=\"o\">(<\/span><span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">3<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6309\u7167\u4e0b\u9762\u8fd9\u79cd\u5199\u6cd5\uff0c\u5b83\u5c06\u4e0d\u4f1a\u56de\u6765\u3002\u8bf7\u601d\u8003\u4e00\u4e0b\u4e3a\u4ec0\u4e48\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">IntStream<\/span><span class=\"o\">.<\/span><span class=\"na\">iterate<\/span><span class=\"o\">(<\/span><span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++)<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u53ea\u8981\u8fd9\u6837\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">IntStream<\/span><span class=\"o\">.<\/span><span class=\"na\">iterate<\/span><span class=\"o\">(<\/span><span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"o\">,<\/span> <span class=\"n\">i<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">++<\/span><span class=\"n\">i<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">::<\/span><span class=\"n\">println<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h3>\u53ef\u9009\/\u53ef\u9009\u6574\u578b\/\u53ef\u9009\u957f\u6574\u578b\/\u53ef\u9009\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u578b<\/p>\n<h4>\u629b\u51fa\u5f02\u5e38\uff0c\u5426\u5219\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002<\/p>\n<h4>\u662f\u7a7a\u7684<\/p>\n<h4>\u6d41()\u8f6c\u6362\u4eceOptional\u5230Stream\u53d8\u5f97\u66f4\u52a0\u7b80\u5355\u3002<br \/>\n\u8fd9\u6837\u4e00\u6765\uff0c\u5728\u8fd4\u56deOptional\u7684Stream\u4e2d\u4e0d\u518d\u9700\u8981\u63d2\u5165filter(Optional::isPresent)\u3002<br \/>\n\u4f8b\u5982\uff0c\u5f53getById\u8fd4\u56deOptional\u65f6\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">ids<\/span><span class=\"o\">.<\/span><span class=\"na\">map<\/span><span class=\"o\">(<\/span><span class=\"nl\">Data:<\/span><span class=\"o\">:<\/span><span class=\"n\">getById<\/span><span class=\"o\">)<\/span>\r\n   <span class=\"o\">.<\/span><span class=\"na\">filter<\/span><span class=\"o\">(<\/span><span class=\"nl\">Optional:<\/span><span class=\"o\">:<\/span><span class=\"n\">isPresent<\/span><span class=\"o\">)<\/span>\r\n   <span class=\"o\">.<\/span><span class=\"na\">collect<\/span><span class=\"o\">(<\/span><span class=\"nc\">Collectors<\/span><span class=\"o\">.<\/span><span class=\"na\">toList<\/span><span class=\"o\">())<\/span>\r\n<\/code><\/pre>\n<p>\u7167\u8457\u4ee5\u524d\u7684\u65b9\u5f0f\u6765\u505a<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">ids<\/span><span class=\"o\">.<\/span><span class=\"na\">flatMap<\/span><span class=\"o\">(<\/span><span class=\"n\">id<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">getById<\/span><span class=\"o\">(<\/span><span class=\"n\">id<\/span><span class=\"o\">).<\/span><span class=\"na\">stream<\/span><span class=\"o\">())<\/span>\r\n   <span class=\"o\">.<\/span><span class=\"na\">collect<\/span><span class=\"o\">(<\/span><span class=\"nc\">Collectors<\/span><span class=\"o\">.<\/span><span class=\"na\">toList<\/span><span class=\"o\">())<\/span>\r\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u4f7f\u7528flatMap\u4ee5\u7c7b\u4f3c\u7684\u65b9\u5f0f\u8fdb\u884c\u4e66\u5199\u3002<\/p>\n<h4>\u5982\u679c\u5b58\u5728\uff0c\u5c31\u6267\u884c\u8be5\u64cd\u4f5c\uff1b\u5426\u5219\u6267\u884c\u53e6\u5916\u4e00\u4e2a\u64cd\u4f5c\u3002<\/p>\n<h4>\u6216\u8005\u5982\u679cOptional\u662f\u7a7a\u7684\uff0c\u5199\u4e0b\u4e00\u4e2a\u50cf\u4e0b\u4e00\u4e2aOptional\u8fd9\u6837\u7684\u4e8b\u60c5\u53d8\u5f97\u66f4\u5bb9\u6613\u4e86\u3002<\/p>\n<h3>\u6536\u85cf\u5bb6<\/p>\n<h4>\u5c06\u5217\u8868\u8f6c\u4e3a\u4e0d\u53ef\u4fee\u6539\u7684\u5217\u8868 \/ \u96c6\u5408\u8f6c\u4e3a\u4e0d\u53ef\u4fee\u6539\u7684\u96c6\u5408 \/ 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zh\u011b)<\/p>\n<h4>\u8f6c\u8d26\u81f3\u5c06Reader\u9605\u8bfb\u7684\u5185\u5bb9\u76f4\u63a5\u5199\u5165Writer\u8fd9\u4e00\u884c\u3002<\/p>\n<h4>\u7a7a\u9605\u8bfb\u5668<\/p>\n<h3>\u4f5c\u8005 (zu\u00f2 zh\u011b)<\/p>\n<h4>\u7a7a\u4f5c\u5bb6<\/p>\n<h3>\u8f93\u5165\u6d41<\/p>\n<h4>\u8f6c\u79fb\u7ed9\u5c06\u4eceInputStream\u4e2d\u8bfb\u53d6\u7684\u5185\u5bb9\u76f4\u63a5\u5199\u5165OutputStream\u7684\u64cd\u4f5c\u53ef\u4ee5\u5199\u5728\u4e00\u884c\u4e2d\u3002<\/p>\n<h4>\u7a7a\u8f93\u5165\u6d41<\/p>\n<h3>\u8f93\u51fa\u6d41<\/p>\n<h4>\u7a7a\u8f93\u51fa\u6d41<\/p>\n<h2>Java.net.http \u53ef\u4ee5\u88ab\u6539\u5199\u6210\u4ee5\u4e0b\u7684\u4e2d\u6587\u8868\u8fbe\u65b9\u5f0f\uff1aJava \u7f51\u7edc\uff0c\u5373 Java.net\u3002HTTP\u8bbf\u95ee\u5df2\u7ecf\u66f4\u65b0\u3002<\/p>\n<h2>sun.misc \u56de\u7b54: \u592a\u9633.\u6742\u9879\u597d\u50cf\u6709\u5f88\u591a\u6771\u897f\u88ab\u522a\u9664\u4e86<\/p>\n<h3>sun.misc.BASE64Encoder \/ BASE64Decoder \u53ef\u4ee5\u88ab\u7528\u6765\u8fdb\u884cBase64\u7f16\u7801\u548c\u89e3\u7801\u7684\u65b9\u6cd5\u3002\u7531\u4e8eJava9\u4e2d\u5df2\u88ab\u5220\u9664\uff0c\u56e0\u6b64\u8bf7\u6539\u7528java.util.BASE64.Encoder \/ Decoder\u3002<\/p>\n<h1>JVM\uff0c\u5373Java\u865a\u62df\u673a\u3002<\/p>\n<h2>\u65e5\u5fd7http:\/\/openjdk.java.net\/jeps\/158:<br \/>\n\u8fd9\u4e2a\u94fe\u63a5\u63d0\u4f9b\u6709\u5173OpenJDK\u9879\u76ee\u4e2dJEP 158\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<p>http:\/\/openjdk.java.net\/jeps\/271:<br \/>\n\u901a\u8fc7\u6b64\u94fe\u63a5\u53ef\u4ee5\u83b7\u53d6\u6709\u5173OpenJDK\u9879\u76ee\u4e2dJEP 271\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<h2>G1GC \u662f\u9ed8\u8ba4\u7684\u5783\u573e\u56de\u6536\u5668\u3002\u6253\u5f00jdk.java.net\/jeps\/248<\/p>\n<h2>\u5bf9\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u4e2d\u6587\u7ffb\u8bd1\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u62e9\uff1a\u5317\u4eac\u4e2d\u5173\u6751\u79d1\u6280\u56ed\u533a<\/p>\n<h2>CMS \u4e0d\u518d\u88ab\u652f\u6301<\/p>\n<h2>\u63d0\u524d\u7f16\u8bd1<\/p>\n<h1>\u529f\u80fd<\/p>\n<h2>JShell \u7ec8\u7aef<\/p>\n<h2>\u53d1\u5e03\u5355\u6587\u4ef6\u6e90\u4ee3\u7801\u7a0b\u5e8f\u73b0\u5728\u53ef\u4ee5\u4f7f\u7528java\u547d\u4ee4\u5728\u4e0d\u9700\u8981\u4f7f\u7528javac\u7f16\u8bd1\u5355\u4e00Java\u4ee3\u7801\u6587\u4ef6\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u6267\u884c\u4e86\u3002<\/p>\n<h2>\u6a21\u5757\u7cfb\u7edf<\/p>\n<h2>Java EE\u548cCORBA\u88ab\u653e\u5f03\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eceJava 8\u5347\u7ea7\u81f3Java 11http:\/\/openjdk.java.net\/projects\/jdk9\/ [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31016","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is 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