{"id":31373,"date":"2023-08-13T05:13:26","date_gmt":"2022-12-10T13:46:26","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava8%e7%9a%84%e6%9b%b4%e6%96%b0\/"},"modified":"2025-08-12T23:42:45","modified_gmt":"2025-08-12T15:42:45","slug":"%e5%85%b3%e4%ba%8ejava8%e7%9a%84%e6%9b%b4%e6%96%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava8%e7%9a%84%e6%9b%b4%e6%96%b0\/","title":{"rendered":"\u5173\u4e8eJava8\u7684\u66f4\u65b0"},"content":{"rendered":"<p>\u4eca\u662f\u6700\u65b0\u7684\u6d88\u606f\uff0c\u6211\u603b\u7ed3\u4e86Java8\u4e2d\u66f4\u65b0\u7684\u529f\u80fd\u3002<\/p>\n<p>\u56e0\u4e3a\u6709\u4e00\u4ef6\u8ba9\u6211\u611f\u5230\u975e\u5e38\u5c34\u5c2c\u7684\u4e8b\u60c5\uff0c\u6211\u7684\u8bb0\u5fc6\u6709\u4e9b\u6a21\u7cca\uff0c\u65e0\u6cd5\u7406\u89e3&#8230;\u6240\u4ee5\u6211\u5728\u8fd9\u91cc\u91cd\u65b0\u5199\u4e0b\u6765\uff0c\u5e0c\u671b\u4eca\u540e\u4e0d\u518d\u53d1\u751f\uff0c\u7edd\u5bf9\u4e0d\u4f1a\u5fd8\u8bb0\u3002<\/p>\n<p>\u9996\u5148\uff0c\u4e3a\u4e86\u83b7\u5f97\u6574\u4f53\u611f\u548c\u6982\u8ff0\u7684\u76ee\u7684&#8230;\u6e90\u4ee3\u7801\u4e5f\u975e\u5e38\u7b80\u6d01\u3002\u6211\u8ba1\u5212\u5728\u4eca\u540e\u7684\u53e6\u4e00\u7bc7\u6587\u7ae0\u4e2d\u8be6\u7ec6\u4ecb\u7ecd\u6bcf\u4e2a\u66f4\u65b0\u3002<\/p>\n<p>\u5982\u679c\u60a8\u80fd\u591f\u53c2\u8003\u4e00\u4e0b\uff0c\u6211\u5c06\u4e0d\u80dc\u611f\u6fc0\u3002<\/p>\n<h2>\u4ee5\u4e0b\u662fJava7\u5347\u7ea7\u81f3Java8\u7684\u4e3b\u8981\u529f\u80fd<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306estatic\u30e1\u30bd\u30c3\u30c9<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">final\u306e\u7701\u7565\uff08\u5b9f\u8cea\u7684final\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e9\u30e0\u30c0\u5f0f\uff08() -&gt; {}\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e1\u30bd\u30c3\u30c9\u53c2\u7167<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u53c2\u7167<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ec\u30b7\u30fc\u30d0\u30fc\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\uff08\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570this\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u65e5\u4ed8\u6642\u523bAPI<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">StreamAPI<\/ul>\n<p>\u4ed6 (t\u0101) could be paraphrased in Chinese as:<br \/>\n&#8211; \u4ed6\u4eba (t\u0101<br \/>\n&#8211; \u67d0\u4eba<br \/>\n&#8211; \u8fd9\u4e2a\u4eba (zh\u00e8 ge<\/p>\n<h2>\u63a5\u53e3\u4e2d\u7684\u9759\u6001\u65b9\u6cd5\u9759\u6001\u65b9\u6cd5\u53ef\u4ee5\u5728\u63a5\u53e3\u4e0a\u5b9a\u4e49\u3002<br \/>\n\u53ef\u4ee5\u50cf\u4e0b\u9762\u7684\u793a\u4f8b\u4e00\u6837\uff0c\u5728Main\u7c7b\u4e2d\u7ee7\u627f\u63a5\u53e3\u5e76\u8c03\u7528\u9759\u6001\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"kd\">implements<\/span> <span class=\"no\">A1<\/span><span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"no\">A1<\/span><span class=\"o\">.<\/span><span class=\"na\">getValue<\/span><span class=\"o\">());<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">A1<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">getValue<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">return<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>1\r\n<\/code><\/pre>\n<h2>\u63a5\u53e3\u7684\u9ed8\u8ba4\u65b9\u6cd5\u73b0\u5728\u53ef\u4ee5\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u5177\u4f53\u65b9\u6cd5\uff08\u975e\u62bd\u8c61\u65b9\u6cd5\uff09\uff0c\u8fd9\u88ab\u79f0\u4e3a\u201c\u9ed8\u8ba4\u65b9\u6cd5\u201d\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"no\">A<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"no\">A<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">a<\/span><span class=\"o\">.<\/span><span class=\"na\">getValue<\/span><span class=\"o\">());<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">A<\/span> <span class=\"kd\">implements<\/span> <span class=\"no\">B1<\/span> <span class=\"o\">{<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">B1<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">default<\/span> <span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">getValue<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"mi\">3<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>3\r\n<\/code><\/pre>\n<h2>\u6700\u7ec8\u7684\u7b80\u7565\u5f62\u5f0f\uff08\u5b9e\u9645\u4e0a\u7684\u6700\u7ec8\u5f62\u5f0f\uff09<br \/>\n\u5728\u5b9e\u9645\u4e0a\u662f\u6700\u7ec8\u7684\uff08\u4e8b\u5b9e\u4e0a\u662f\u6700\u7ec8\u7684\uff09\u53d8\u91cf\u4e0a\u4e0d\u518d\u9700\u8981\u52a0\u4e0afinal\u3002<br \/>\n\u5728Lambda\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528\u7684\u53d8\u91cf\u53d8\u6210\u4e86\u5b9e\u9645\u4e0a\u662f\u6700\u7ec8\u7684\u4f8b\u5b50\u3002<br \/>\nname\u53d8\u91cf\u53d8\u6210\u4e86\u5b9e\u9645\u4e0a\u662f\u6700\u7ec8\u7684\uff08\u5373\u4f7f\u52a0\u4e0afinal\u4fee\u9970\u7b26\u4e5f\u53ef\u4ee5\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Java!\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">HelloJava<\/span> <span class=\"n\">g<\/span> <span class=\"o\">=<\/span> <span class=\"n\">a<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hello \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"World!\"<\/span><span class=\"o\">;<\/span>   <span class=\"c1\">\/\/\u3053\u3053\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n        <span class=\"n\">g<\/span><span class=\"o\">.<\/span><span class=\"na\">test<\/span><span class=\"o\">(<\/span><span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">HelloJava<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>\u30e9\u30e0\u30c0\u5f0f\u304b\u3089\u53c2\u7167\u3055\u308c\u308b\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306f\u3001final\u307e\u305f\u306f\u4e8b\u5b9f\u4e0a\u306efinal\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\r\n<\/code><\/pre>\n<h2>\u533f\u540d\u51fd\u5f0f\uff08() -&gt; {}\uff09\u53ef\u4ee5\u5c06Lambda\u8868\u8fbe\u5f0f\u4f20\u9012\u7ed9\u51fd\u6570\u63a5\u53e3\uff08\u53ea\u5b9a\u4e49\u4e86\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff09\u7684\u53d8\u91cf\u8d4b\u503c\u5904\u3002<\/p>\n<h4>\u4f7f\u7528\u533f\u540d\u7c7b\u7684\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"no\">B1<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"no\">B1<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"na\">test<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Java\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">B1<\/span> <span class=\"kd\">implements<\/span> <span class=\"no\">A1<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">n<\/span><span class=\"o\">){<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hello \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">n<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">A1<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u7684\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Java\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"no\">A1<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"n\">n<\/span><span class=\"o\">)<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hello \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">n<\/span> <span class=\"o\">);<\/span>\r\n        <span class=\"o\">};<\/span>\r\n        <span class=\"n\">a<\/span><span class=\"o\">.<\/span><span class=\"na\">test<\/span><span class=\"o\">(<\/span><span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">A1<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>Hello Java\r\n<\/code><\/pre>\n<h4>\u4f18\u70b9\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3\uff08\u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff09\u7684\u5199\u6cd5\u6bd4\u4f7f\u7528\u533f\u540d\u7c7b\uff08\u53ea\u4f7f\u7528\u4e00\u6b21\u7684\u7c7b\uff09\u66f4\u52a0\u7b80\u6d01\u3002\u901a\u8fc7\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u907f\u514d\u7a0b\u5e8f\u53d8\u5f97\u5197\u957f\uff0c\u5e76\u80fd\u591f\u5c06\u6ce8\u610f\u529b\u96c6\u4e2d\u4e8e\u66f4\u52a0\u6838\u5fc3\u7684\u90e8\u5206\u3002<\/p>\n<h2>\u65b9\u6cd5\u5f15\u7528\u53ef\u4ee5\u5c06\u65b9\u6cd5\u672c\u8eab\u8d4b\u503c\u7ed9\u51fd\u6570\u5f0f\u63a5\u53e3\uff08\u53ea\u5b9a\u4e49\u4e86\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff09\u7684\u53d8\u91cf\u3002\u8fd9\u88ab\u79f0\u4e3a&#8221;\u65b9\u6cd5\u5f15\u7528&#8221;\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Java\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"no\">A1<\/span> <span class=\"n\">a<\/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\">a<\/span><span class=\"o\">.<\/span><span class=\"na\">test<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Hello \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">A1<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>Hello Java\r\n<\/code><\/pre>\n<h2>\u6784\u9020\u51fd\u6570\u5f15\u7528<br \/>\n\u4e0e\u65b9\u6cd5\u5f15\u7528\u7c7b\u4f3c\uff0c\u6784\u9020\u51fd\u6570\u4e5f\u53ef\u4ee5\u88ab\u8d4b\u503c\u7ed9\u51fd\u6570\u5f0f\u63a5\u53e3\uff08\u5b9a\u4e49\u4e86\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff09\u7684\u53d8\u91cf\u3002<br \/>\n\u8fd9\u88ab\u79f0\u4e3a&#8221;\u6784\u9020\u51fd\u6570\u5f15\u7528&#8221;\u3002<\/p>\n<p>\u53ea\u9700\u4e00\u79cd\u9009\u9879\uff0c\u7528\u4e2d\u6587\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u8f6c\u8ff0\uff1a\u4f7f\u7528java.util.function\u5305\u4e2d\u7684Supplier\u63a5\u53e3\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.function.Supplier<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Supplier<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">B1<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"nl\">B1:<\/span><span class=\"o\">:<\/span><span class=\"k\">new<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">().<\/span><span class=\"na\">getName<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Java\"<\/span><span class=\"o\">));<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">B1<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getName<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"s\">\"Hello \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>Hello Java\r\n<\/code><\/pre>\n<h2>\u63a5\u6536\u5668\u53c2\u6570\uff08\u65b9\u6cd5\u7684\u53c2\u6570this\uff09\u5728\u65b9\u6cd5\u7684\u5f00\u5934\uff0c\u53ef\u4ee5\u6307\u5b9athis\u4f5c\u4e3a\u53c2\u6570\u3002<br \/>\n\u8fd9\u88ab\u79f0\u4e3a\u663e\u5f0f\u63a5\u6536\u5668\u53c2\u6570\uff08explicit receiver parameters\uff09\uff08\u5728\u7f16\u8bd1\u65f6\u7684\u9519\u8bef\u6d88\u606f\u4e2d\u88ab\u79f0\u4e3a\u201c\u663e\u5f0fthis\u53c2\u6570\u201d\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"no\">B1<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"no\">B1<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"na\">getName<\/span><span class=\"o\">());<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">B1<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getName<\/span><span class=\"o\">(<\/span><span class=\"no\">B1<\/span> <span class=\"k\">this<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"s\">\"Hello Java\"<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u8fd0\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>Hello Java\r\n<\/code><\/pre>\n<h2>\u65e5\u671f\u548c\u65f6\u95f4API<br \/>\n\u5f15\u5165\u4e86java.time.LocalDate\u7c7b\u3002\u8be5\u7c7b\u7684\u7279\u70b9\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u4e00\u65e6\u5b57\u6bb5\u7684\u503c\u88ab\u8bbe\u5b9a\uff0c\u4e4b\u540e\u8be5\u503c\u5c31\u4e0d\u4f1a\u518d\u88ab\u6539\u53d8\u7684\u5bf9\u8c61\u3002<br \/>\n\u5b83\u7684\u4f18\u70b9\u5305\u62ec\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u305f\u304b\u3069\u3046\u304b\u3092\u78ba\u304b\u3081\u308b\u5fc5\u8981\u304c\u306a\u3044\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u3042\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c7\u30fc\u30bf\u306e\u8907\u88fd\u3092\u8003\u3048\u308b\u5fc5\u8981\u304c\u306a\u3044\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u8907\u6570\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u3088\u308b\u30c7\u30fc\u30bf\u5171\u6709\u304c\u53ef\u80fd\u3067\u3042\u308b\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.time.LocalDate<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">LocalDate<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDate<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"mi\">2021<\/span><span class=\"o\">,<\/span> <span class=\"mi\">4<\/span><span class=\"o\">,<\/span> <span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">LocalDate<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LocalDate<\/span><span class=\"o\">.<\/span><span class=\"na\">parse<\/span><span class=\"o\">(<\/span><span class=\"s\">\"2021-04-01\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">a<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">b<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>2021-04-01\r\n2021-04-01\r\n<\/code><\/pre>\n<h2>\u6d41API\u901a\u8fc7\u96c6\u5408\u3001\u6570\u7ec4\u3001I\/O\u8d44\u6e90\u7b49\u6570\u636e\u6e90\uff0c\u8fdb\u884c\u805a\u5408\u64cd\u4f5c\u7684API\u3002<br \/>\n\u6d41\u53ef\u4ee5\u5c06\u67d0\u4e2a\u5904\u7406\u7ed3\u679c\u4f5c\u4e3a\u4e0b\u4e00\u4e2a\u5904\u7406\u7684\u6570\u636e\u6e90\u4f20\u9012\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u901a\u8fc7\u6570\u636e\u6e90\u5bf9\u6570\u636e\u8fdb\u884c\u5404\u79cd\u5904\u7406\u3002<\/p>\n<h4>\u4e0d\u4f7f\u7528\u6d41\u5f0f\u5904\u7406\u7684\u4f8b\u5b50<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.*<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\r\n        <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">list<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">asList<\/span><span class=\"o\">(<\/span><span class=\"s\">\"bb\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"aa\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"cc\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">i<\/span><span class=\"o\">=<\/span><span class=\"mi\">0<\/span><span class=\"o\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">size<\/span><span class=\"o\">();<\/span> <span class=\"n\">i<\/span><span class=\"o\">++)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"nc\">String<\/span> <span class=\"n\">str<\/span> <span class=\"o\">=<\/span> <span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"n\">i<\/span><span class=\"o\">).<\/span><span class=\"na\">toUpperCase<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">set<\/span><span class=\"o\">(<\/span><span class=\"n\">i<\/span><span class=\"o\">,<\/span> <span class=\"n\">str<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">sort<\/span><span class=\"o\">(<\/span><span class=\"n\">list<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"k\">for<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">str<\/span> <span class=\"o\">:<\/span> <span class=\"n\">list<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"n\">str<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\" \"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u4f7f\u7528Stream\u7684\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.*<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\r\n        <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">list<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Arrays<\/span><span class=\"o\">.<\/span><span class=\"na\">asList<\/span><span class=\"o\">(<\/span><span class=\"s\">\"bb\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"aa\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"cc\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">list<\/span><span class=\"o\">.<\/span><span class=\"na\">stream<\/span><span class=\"o\">().<\/span><span class=\"na\">sorted<\/span><span class=\"o\">().<\/span><span class=\"na\">map<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">s<\/span><span class=\"o\">.<\/span><span class=\"na\">toUpperCase<\/span><span class=\"o\">()).<\/span><span class=\"na\">forEach<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\" \"<\/span><span class=\"o\">));<\/span>\r\n\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u6267\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>AA BB CC\r\n<\/code><\/pre>\n<p>\u8bf7\u7528\u6c49\u8bed\u5c06\u4e0b\u8ff0\u5185\u5bb9\u8fdb\u884c\u540c\u610f\u8f6c\u8ff0\uff0c\u53ea\u9700\u63d0\u4f9b\u4e00\u4e2a\u7b54\u6848\uff1a<\/p>\n<p>I am learning Chinese because I want to be able to communicate with more people and have a better understanding of Chinese culture.<\/p>\n<hr \/>\n<h4>\u6211\u53ef\u4ee5\u501f\u9274\u7684\u7f51\u7ad9<\/p>\n<h4>\u786e\u8ba4\u6267\u884c<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u662f\u6700\u65b0\u7684\u6d88\u606f\uff0c\u6211\u603b\u7ed3\u4e86Java8\u4e2d\u66f4\u65b0\u7684\u529f\u80fd\u3002 \u56e0\u4e3a\u6709\u4e00\u4ef6\u8ba9\u6211\u611f\u5230\u975e\u5e38\u5c34\u5c2c\u7684\u4e8b\u60c5\uff0c\u6211\u7684\u8bb0\u5fc6\u6709\u4e9b\u6a21\u7cca\uff0c\u65e0\u6cd5\u7406\u89e3 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31373","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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