{"id":61829,"date":"2024-10-13T14:02:14","date_gmt":"2024-10-13T06:02:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61829\/"},"modified":"2024-10-13T14:02:14","modified_gmt":"2024-10-13T06:02:14","slug":"java-8%e9%87%8d%e6%a7%8b%e5%82%b3%e7%b5%b1%e8%a8%ad%e8%a8%88%e6%a8%a1%e5%bc%8f%ef%bc%8c%e6%98%af%e7%9c%9f%e7%9a%84%e5%84%aa%e9%9b%85%ef%bc%81","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61829\/","title":{"rendered":"Java 8\u91cd\u69cb\u50b3\u7d71\u8a2d\u8a08\u6a21\u5f0f\uff0c\u662f\u771f\u7684\u512a\u96c5\uff01"},"content":{"rendered":"<h1 id=\"java-8%e9%87%8d%e6%a7%8b%e5%82%b3%e7%b5%b1%e8%a8%ad%e8%a8%88%e6%a8%a1%e5%bc%8f%ef%bc%8c%e6%98%af%e7%9c%9f%e7%9a%84%e5%84%aa%e9%9b%85%ef%bc%81-lcEBzolQHD\">Java 8\u91cd\u69cb\u50b3\u7d71\u8a2d\u8a08\u6a21\u5f0f\uff0c\u662f\u771f\u7684\u512a\u96c5\uff01<\/h1>\n<p>\u5728\u8edf\u9ad4\u958b\u767c\u7684\u4e16\u754c\u4e2d\uff0c\u8a2d\u8a08\u6a21\u5f0f\u662f\u4e00\u7a2e\u88ab\u5ee3\u6cdb\u4f7f\u7528\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u65e8\u5728\u89e3\u6c7a\u5e38\u898b\u7684\u8a2d\u8a08\u554f\u984c\u3002\u96a8\u8457Java 8\u7684\u63a8\u51fa\uff0c\u8a31\u591a\u958b\u767c\u8005\u958b\u59cb\u91cd\u65b0\u601d\u8003\u5982\u4f55\u5229\u7528\u65b0\u7279\u6027\u4f86\u512a\u5316\u548c\u91cd\u69cb\u50b3\u7d71\u7684\u8a2d\u8a08\u6a21\u5f0f\u3002\u672c\u6587\u5c07\u63a2\u8a0eJava 8\u5982\u4f55\u91cd\u69cb\u50b3\u7d71\u8a2d\u8a08\u6a21\u5f0f\uff0c\u4e26\u5c55\u793a\u5176\u512a\u96c5\u4e4b\u8655\u3002<\/p>\n<h2 id=\"java-8%e7%9a%84%e6%96%b0%e7%89%b9%e6%80%a7-lcEBzolQHD\">Java 8\u7684\u65b0\u7279\u6027<\/h2>\n<p>Java 8\u5f15\u5165\u4e86\u5e7e\u500b\u91cd\u8981\u7684\u65b0\u7279\u6027\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>Lambda \u8868\u9054\u5f0f\uff1a<\/strong>\u9019\u4f7f\u5f97\u53ef\u4ee5\u7528\u66f4\u7c21\u6f54\u7684\u65b9\u5f0f\u4f86\u8868\u793a\u533f\u540d\u51fd\u6578\u3002<\/li>\n<li><strong>Stream API\uff1a<\/strong>\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u7684\u65b9\u5f0f\u4f86\u8655\u7406\u96c6\u5408\uff0c\u652f\u6301\u4e32\u884c\u548c\u4e26\u884c\u64cd\u4f5c\u3002<\/li>\n<li><strong>Optional \u985e\uff1a<\/strong>\u7528\u65bc\u907f\u514dNullPointerException\uff0c\u63d0\u4f9b\u4e86\u4e00\u7a2e\u66f4\u5b89\u5168\u7684\u65b9\u5f0f\u4f86\u8655\u7406\u53ef\u80fd\u70ba\u7a7a\u7684\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%87%8d%e6%a7%8b%e5%82%b3%e7%b5%b1%e8%a8%ad%e8%a8%88%e6%a8%a1%e5%bc%8f%e7%9a%84%e5%84%aa%e9%9b%85%e4%b9%8b%e8%99%95-lcEBzolQHD\">\u91cd\u69cb\u50b3\u7d71\u8a2d\u8a08\u6a21\u5f0f\u7684\u512a\u96c5\u4e4b\u8655<\/h2>\n<p>\u4ee5\u4e0b\u662f\u5e7e\u500b\u50b3\u7d71\u8a2d\u8a08\u6a21\u5f0f\u5728Java 8\u4e2d\u91cd\u69cb\u7684\u4f8b\u5b50\uff1a<\/p>\n<h3 id=\"%e7%ad%96%e7%95%a5%e6%a8%a1%e5%bc%8f-lcEBzolQHD\">\u7b56\u7565\u6a21\u5f0f<\/h3>\n<p>\u7b56\u7565\u6a21\u5f0f\u5141\u8a31\u5728\u904b\u884c\u6642\u9078\u64c7\u7b97\u6cd5\u3002\u50b3\u7d71\u4e0a\uff0c\u9019\u9700\u8981\u5275\u5efa\u4e00\u500b\u63a5\u53e3\u548c\u591a\u500b\u5be6\u73fe\u985e\u3002\u4f7f\u7528Java 8\u7684Lambda\u8868\u9054\u5f0f\uff0c\u6211\u5011\u53ef\u4ee5\u7c21\u5316\u9019\u4e00\u904e\u7a0b\uff1a<\/p>\n<pre><code>interface Strategy {\n    int doOperation(int num1, int num2);\n}\n\npublic class Context {\n    private Strategy strategy;\n\n    public Context(Strategy strategy) {\n        this.strategy = strategy;\n    }\n\n    public int executeStrategy(int num1, int num2) {\n        return strategy.doOperation(num1, num2);\n    }\n}\n\n\/\/ \u4f7f\u7528Lambda\u8868\u9054\u5f0f\nContext context = new Context((a, b) -&gt; a + b);\nSystem.out.println(\"10 + 5 = \" + context.executeStrategy(10, 5));\n<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u5beb\u6cd5\u4e0d\u50c5\u6e1b\u5c11\u4e86\u4ee3\u78bc\u91cf\uff0c\u9084\u63d0\u9ad8\u4e86\u53ef\u8b80\u6027\u3002<\/p>\n<h3 id=\"%e8%a7%80%e5%af%9f%e8%80%85%e6%a8%a1%e5%bc%8f-lcEBzolQHD\">\u89c0\u5bdf\u8005\u6a21\u5f0f<\/h3>\n<p>\u89c0\u5bdf\u8005\u6a21\u5f0f\u5141\u8a31\u5c0d\u8c61\u5728\u72c0\u614b\u6539\u8b8a\u6642\u901a\u77e5\u5176\u4ed6\u5c0d\u8c61\u3002\u5728Java 8\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528Stream API\u4f86\u7c21\u5316\u9019\u4e00\u904e\u7a0b\uff1a<\/p>\n<pre><code>import java.util.ArrayList;\nimport java.util.List;\nimport java.util.function.Consumer;\n\nclass Subject {\n    private List&lt;Consumer&gt; observers = new ArrayList();\n\n    public void attach(Consumer observer) {\n        observers.add(observer);\n    }\n\n    public void notifyObservers(String message) {\n        observers.forEach(observer -&gt; observer.accept(message));\n    }\n}\n\n\/\/ \u4f7f\u7528\u793a\u4f8b\nSubject subject = new Subject();\nsubject.attach(msg -&gt; System.out.println(\"Observer 1: \" + msg));\nsubject.attach(msg -&gt; System.out.println(\"Observer 2: \" + msg));\n\nsubject.notifyObservers(\"Hello Observers!\");\n<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u5be6\u73fe\u65b9\u5f0f\u4f7f\u5f97\u89c0\u5bdf\u8005\u7684\u6dfb\u52a0\u548c\u901a\u77e5\u8b8a\u5f97\u66f4\u52a0\u9748\u6d3b\u548c\u7c21\u55ae\u3002<\/p>\n<h3 id=\"%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f-lcEBzolQHD\">\u55ae\u4f8b\u6a21\u5f0f<\/h3>\n<p>\u55ae\u4f8b\u6a21\u5f0f\u78ba\u4fdd\u4e00\u500b\u985e\u53ea\u6709\u4e00\u500b\u5be6\u4f8b\uff0c\u4e26\u63d0\u4f9b\u5168\u5c40\u8a2a\u554f\u9ede\u3002\u5728Java 8\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u975c\u614b\u65b9\u6cd5\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>class Singleton {\n    private static Singleton instance;\n\n    private Singleton() {}\n\n    public static Singleton getInstance() {\n        if (instance == null) {\n            instance = new Singleton();\n        }\n        return instance;\n    }\n}\n<\/code><\/pre>\n<p>\u9019\u7a2e\u65b9\u5f0f\u7c21\u5316\u4e86\u55ae\u4f8b\u7684\u5be6\u73fe\uff0c\u4e26\u4e14\u4fdd\u6301\u4e86\u7dda\u7a0b\u5b89\u5168\u6027\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-lcEBzolQHD\">\u7d50\u8ad6<\/h2>\n<p>Java 8\u7684\u5f15\u5165\u4e0d\u50c5\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u65b0\u7279\u6027\uff0c\u9084\u4fc3\u4f7f\u6211\u5011\u91cd\u65b0\u601d\u8003\u548c\u91cd\u69cb\u50b3\u7d71\u7684\u8a2d\u8a08\u6a21\u5f0f\u3002\u901a\u904e\u4f7f\u7528Lambda\u8868\u9054\u5f0f\u548cStream API\uff0c\u6211\u5011\u80fd\u5920\u4ee5\u66f4\u7c21\u6f54\u548c\u512a\u96c5\u7684\u65b9\u5f0f\u4f86\u5be6\u73fe\u9019\u4e9b\u6a21\u5f0f\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\uff0c\u4e5f\u4f7f\u5f97\u7dad\u8b77\u548c\u64f4\u5c55\u8b8a\u5f97\u66f4\u52a0\u5bb9\u6613\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u9805\u76ee\u4e2d\u4f7f\u7528\u9019\u4e9b\u6280\u8853\u6709\u8208\u8da3\uff0c\u6216\u8005\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Java 8\u5982\u4f55\u91cd\u69cb\u50b3\u7d71\u8a2d\u8a08\u6a21\u5f0f\uff0c\u63d0\u5347\u4ee3\u78bc\u512a\u96c5\u6027\u8207\u53ef\u8b80\u6027\uff0c\u8b93\u958b\u767c\u66f4\u9ad8\u6548\u3001\u66f4\u9748\u6d3b\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-61829","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61829","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=61829"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61829\/revisions"}],"predecessor-version":[{"id":61830,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61829\/revisions\/61830"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=61829"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=61829"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=61829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}