{"id":1942,"date":"2021-10-07T21:20:39","date_gmt":"2021-10-07T13:20:39","guid":{"rendered":"https:\/\/199604.com\/?p=1942"},"modified":"2021-10-07T21:20:39","modified_gmt":"2021-10-07T13:20:39","slug":"%e4%bb%8ejava-8%e5%88%b0-java-17-java-10","status":"publish","type":"post","link":"https:\/\/199604.com\/1942","title":{"rendered":"\u4eceJava 8\u5230 Java 17&#8211;Java 10"},"content":{"rendered":"<p>\u4eceJava 10 \u5f00\u59cb\uff0cJava\u7684\u8fed\u4ee3\u5468\u671f\u7f29\u77ed\u4e3a\u534a\u5e74\uff0c\u534a\u5e74\u53d1\u5e03\u4e00\u4e2a\u7248\u672c\u3002Java10\u5b83\u53f7\u79f0\u6709109\u9879\u65b0\u7279\u6027\uff0c\u5305\u542b12\u4e2aJEP\u3002<\/p>\n<p><strong>\u7279\u6027\u5217\u8868<\/strong><\/p>\n<ul>\n<li>\u5c40\u90e8\u53d8\u91cf\u7684\u7c7b\u578b\u63a8\u65ad var\u5173\u952e\u5b57<\/li>\n<li>GC\u6539\u8fdb\u548c\u5185\u5b58\u7ba1\u7406 \u5e76\u884c\u5168\u5783\u573e\u56de\u6536\u5668 G1<\/li>\n<li>\u5783\u573e\u56de\u6536\u5668\u63a5\u53e3<\/li>\n<li>\u7ebf\u7a0b-\u5c40\u90e8\u53d8\u91cf\u7ba1\u63a7<\/li>\n<li>\u5408\u5e76 JDK \u591a\u4e2a\u4ee3\u7801\u4ed3\u5e93\u5230\u4e00\u4e2a\u5355\u72ec\u7684\u50a8\u5b58\u5e93\u4e2d<\/li>\n<li>\u65b0\u589eAPI\uff1aByteArrayOutputStream<\/li>\n<li>\u65b0\u589eAPI\uff1aList\u3001Map\u3001Set<\/li>\n<li>\u65b0\u589eAPI\uff1ajava.util.Properties<\/li>\n<li>\u65b0\u589eAPI\uff1a Collectors\u6536\u96c6\u5668<\/li>\n<li>\u5176\u5b83\u7279\u6027<\/li>\n<\/ul>\n<h2><strong>1.\u5c40\u90e8\u53d8\u91cf\u7684\u7c7b\u578b\u63a8\u65ad var\u5173\u952e\u5b57<\/strong><\/h2>\n<p>\u8fd9\u4e2a\u65b0\u529f\u80fd\u5c06\u4e3aJava\u589e\u52a0\u4e00\u4e9b\u8bed\u6cd5\u7cd6 &#8211; \u7b80\u5316\u5b83\u5e76\u6539\u5584\u5f00\u53d1\u8005\u4f53\u9a8c\u3002\u65b0\u7684\u8bed\u6cd5\u5c06\u51cf\u5c11\u4e0e\u7f16\u5199Java\u76f8\u5173\u7684\u5197\u957f\u5ea6\uff0c\u540c\u65f6\u4fdd\u6301\u5bf9\u9759\u6001\u7c7b\u578b\u5b89\u5168\u6027\u7684\u627f\u8bfa\u3002<\/p>\n<p>\u8fd9\u53ef\u80fd\u662fJava10\u7ed9\u5f00\u53d1\u8005\u5e26\u6765\u7684\u6700\u5927\u7684\u4e00\u4e2a\u65b0\u7279\u6027\u3002\u4e0b\u9762\u4e3b\u8981\u770b\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"language-java line-numbers\">        \/\/\u5728Java 6\u65f6\u521d\u59cb\u5316\u4e00\u4e2aMap\u9700\u8981\u6211\u4eec\u8fd9\u6837\u6765\u58f0\u660e\uff1a\n        Map&lt;String, String&gt; map_java6 = new HashMap&lt;String,String&gt;();\n        \/\/\u4e8b\u5b9e\u4e0a\u6cdb\u578b\u65b9\u6cd5\u7684\u53c2\u6570\u53ef\u4ee5\u901a\u8fc7\u4e0a\u4e0b\u6587\u63a8\u5bfc\u51fa\u6765\uff0c\u6240\u4ee5\u5728Java 7 \u4e2d\u7b80\u5316\u4e3a\uff1a\n        Map&lt;String, String&gt; map_java7 = new HashMap&lt;&gt;();\n        \/\/\u5230\u4e86Java 10 \u8fdb\u4e00\u6b65\u5347\u534e\u4e86\u7c7b\u578b\u63a8\u65ad\uff0c\u6211\u4eec\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a\n        var map_java10 = Map.of(\"hello\",\"world\");\n        System.out.println(\"map_java10:\"+map_java10);\n<\/code><\/pre>\n<p><strong>\u6ce8\u610f\uff1a\u4e0b\u9762\u51e0\u70b9\u4f7f\u7528\u9650\u5236<\/strong><\/p>\n<ol>\n<li>\u5c40\u90e8\u53d8\u91cf\u521d\u59cb\u5316<\/li>\n<li>for\u5faa\u73af\u5185\u90e8\u7d22\u5f15\u53d8\u91cf<\/li>\n<li>\u4f20\u7edf\u7684for\u5faa\u73af\u58f0\u660e\u53d8\u91cf<\/li>\n<\/ol>\n<pre><code class=\"language-java line-numbers\">        \/\/\u5c40\u90e8\u53d8\u91cf\u521d\u59cb\u5316\n        var list = List.of(\"hello\uff0cworld\uff01\");\n        \/\/for\u5faa\u73af\u5185\u90e8\u7d22\u5f15\u53d8\u91cf\n        for (var s : list) {\n            System.out.println(s);\n        }\n        \/\/\u4f20\u7edf\u7684for\u5faa\u73af\u58f0\u660e\u53d8\u91cf\n        for (var i = 0; i &lt; list.size(); i++) {\n            System.out.println(list.get(i));\n        }\n<\/code><\/pre>\n<p>\u4e0b\u9762\u8fd9\u51e0\u79cd\u60c5\u51b5\uff0c\u90fd\u662f\u4e0d\u80fd\u4f7f\u7528var<\/p>\n<ol>\n<li>\u65b9\u6cd5\u53c2\u6570<\/li>\n<li>\u5168\u5c40\u53d8\u91cf<\/li>\n<\/ol>\n<pre><code class=\"language-java line-numbers\">public static var list = new ArrayList&lt;String&gt;(); \/\/\u7f16\u8bd1\u62a5\u9519\npublic static List&lt;String&gt; ll = new ArrayList&lt;&gt;(); \/\/\u6b63\u5e38\u7f16\u8bd1\u901a\u8fc7\n<\/code><\/pre>\n<h2>2.<strong>GC\u6539\u8fdb\u548c\u5185\u5b58\u7ba1\u7406 \u5e76\u884c\u5168\u5783\u573e\u56de\u6536\u5668 G1<\/strong><\/h2>\n<p>JDK 10\u4e2d\u67092\u4e2aJEP\u4e13\u95e8\u7528\u4e8e\u6539\u8fdb\u5f53\u524d\u7684\u5783\u573e\u6536\u96c6\u5143\u7d20\u3002<br \/>\nJava 10\u7684\u7b2c\u4e8c\u4e2aJEP\u662f\u9488\u5bf9G1\u7684\u5e76\u884c\u5b8c\u5168GC\uff08JEP 307\uff09\uff0c\u5176\u91cd\u70b9\u5728\u4e8e\u901a\u8fc7\u5b8c\u5168GC\u5e76\u884c\u6765\u6539\u5584G1\u6700\u574f\u60c5\u51b5\u7684\u7b49\u5f85\u65f6\u95f4\u3002G1\u662fJava 9\u4e2d\u7684\u9ed8\u8ba4GC\uff0c\u5e76\u4e14\u6b64JEP\u7684\u76ee\u6807\u662f\u4f7fG1\u5e73\u884c\u3002<\/p>\n<h2>3.<strong>\u65b0\u589eAPI\uff1aList\u3001Map\u3001Set<\/strong><\/h2>\n<p>\u8fd93\u4e2a\u63a5\u53e3\u90fd\u589e\u52a0\u4e86\u4e00\u4e2a\u65b0\u7684\u9759\u6001\u65b9\u6cd5\uff0ccopyOf(Collection\uff09\u3002\u8fd9\u4e9b\u51fd\u6570\u6309\u7167\u5176\u8fed\u4ee3\u987a\u5e8f\u8fd4\u56de\u4e00\u4e2a\u4e0d\u53ef\u4fee\u6539\u7684\u5217\u8868\u3001\u6620\u5c04\u6216\u5305\u542b\u7ed9\u5b9a\u96c6\u5408\u7684\u5143\u7d20\u7684\u96c6\u5408\u3002<\/p>\n<p>\u590d\u5236\u4e00\u4e2a\u96c6\u5408\u4e3a\u4e0d\u53ef\u53d8\u96c6\u5408\uff1a<\/p>\n<pre><code class=\"language-java line-numbers\">        \/\/\u5c40\u90e8\u53d8\u91cf\u521d\u59cb\u5316\n        var list = List.of(\"hello\uff0cworld\uff01\");\n\n        \/\/ \u590d\u5236list\n        List&lt;String&gt; copyList  = List.copyOf(list);\n        System.out.println(\"copyList:\"+copyList);\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4eceJava 10 \u5f00\u59cb\uff0cJava\u7684\u8fed\u4ee3\u5468\u671f\u7f29\u77ed\u4e3a\u534a\u5e74\uff0c\u534a\u5e74\u53d1\u5e03\u4e00\u4e2a\u7248\u672c\u3002Java10\u5b83\u53f7\u79f0\u6709109\u9879\u65b0\u7279\u6027\uff0c\u5305 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[292,130],"tags":[129],"class_list":{"0":"post-1942","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-java","8":"tag-java"},"_links":{"self":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/posts\/1942","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/comments?post=1942"}],"version-history":[{"count":1,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/posts\/1942\/revisions"}],"predecessor-version":[{"id":1943,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/posts\/1942\/revisions\/1943"}],"wp:attachment":[{"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/media?parent=1942"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/categories?post=1942"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/199604.com\/wp-json\/wp\/v2\/tags?post=1942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}