{"id":31203,"date":"2023-10-12T12:40:09","date_gmt":"2022-11-27T09:03:07","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84%e6%b7%b1%e6%8b%b7%e8%b4%9d%e5%92%8c%e5%bc%95%e7%94%a8\/"},"modified":"2025-08-12T22:49:15","modified_gmt":"2025-08-12T14:49:15","slug":"java%e4%b8%ad%e7%9a%84%e6%b7%b1%e6%8b%b7%e8%b4%9d%e5%92%8c%e5%bc%95%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84%e6%b7%b1%e6%8b%b7%e8%b4%9d%e5%92%8c%e5%bc%95%e7%94%a8\/","title":{"rendered":"Java\u4e2d\u7684\u6df1\u62f7\u8d1d\u548c&#8221;\u5f15\u7528&#8221;"},"content":{"rendered":"<p>(\u672c\u6587\u7ae0\u5047\u8bbe\u57fa\u4e8eJava SE 8\u6216\u4ee5\u4e0a\u7248\u672c)<br \/>\n\u6df1\u62f7\u8d1d\u6307\u7684\u662f\u5728\u590d\u5236\u6e90\u548c\u76ee\u6807\u65f6\uff0c\u4e0d\u4f1a\u5bf9\u76ee\u6807\/\u6e90\u4ea7\u751f\u5f71\u54cd\u7684\u4e00\u79cd\u62f7\u8d1d\u65b9\u5f0f\u3002<br \/>\n\u8981\u5728Java\u4e2d\u5b9e\u73b0\u5f15\u7528\u7c7b\u578b\u7684\u6df1\u62f7\u8d1d\uff0c\u9700\u8981\u751f\u6210\u4e00\u4e2a\u5177\u6709\u4e0e\u6e90\u76f8\u540c\u503c\u7684\u65b0\u5bf9\u8c61\uff0c\u5e76\u4e14\u9700\u8981\u8fdb\u884c\u4e00\u4e9b\u5c0f\u7684\u6539\u8fdb\u3002<\/p>\n<h1>\u5b9e\u9645\u7684\u4ee3\u7801\u793a\u4f8b\uff08\u5217\u8868\u7684\u60c5\u51b5\u4e0b\uff09<\/h1>\n<p>\u5982\u679c\u60a8\u60f3\u8981\u6df1\u5ea6\u590d\u5236\u4e00\u4e2a\u5217\u8868\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\u3002\u5f53\u7136\u8fd8\u6709\u5f88\u591a\u5176\u4ed6\u65b9\u6cd5\u53ef\u4f9b\u9009\u62e9\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u30b3\u30d4\u30fc\u5143<\/span>\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\">listX<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;();<\/span>\r\n<span class=\"n\">listX<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"s\">\"foo\"<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u4f8b<\/span>\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\">listA<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;(<\/span><span class=\"n\">listX<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ NPE\u3092\u907f\u3051\u3001\u30b3\u30d4\u30fc\u5143\u304cnull\u306a\u3089\u7a7a\u306e\u30ea\u30b9\u30c8\u3092\u4ee3\u5165\u3059\u308b\u4f8b<\/span>\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\">listB<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Optional<\/span><span class=\"o\">.<\/span><span class=\"na\">ofNullable<\/span><span class=\"o\">(<\/span><span class=\"n\">listX<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">map<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;&gt;(<\/span><span class=\"n\">e<\/span><span class=\"o\">))<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">orElseGet<\/span><span class=\"o\">(()<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;&gt;());<\/span>\r\n<\/code><\/pre>\n<p>ArrayList\u7684\u6784\u9020\u51fd\u6570\u63a5\u6536ArrayList\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5e76\u751f\u6210\u4e00\u4e2a\u65b0\u7684ArrayList\uff0c\u56e0\u6b64\u8fd9\u4e2a\u64cd\u4f5c\u662f\u6709\u6548\u7684\u3002<\/p>\n<h1>\u5982\u679c\u666e\u901a\u5730\u4f7f\u7528\u201c=\u201d\u8fdb\u884c\u8d4b\u503c\u64cd\u4f5c\uff0c\u4f1a\u53d1\u751f\u4ec0\u4e48\u60c5\u51b5\uff1f<\/h1>\n<p>\u5982\u679c\u662f\u539f\u59cb\u7c7b\u578b\uff0c\u5b83\u5c06\u6309\u7167\u76f4\u89c2\u7684\u65b9\u5f0f\u8fdb\u884c\u64cd\u4f5c\u3002\u5b83\u76f4\u63a5\u5904\u7406\u5b57\u9762\u4e0a\u7684\u539f\u59cb\u503c\uff0c\u8fd9\u6837\u81ea\u7136\u5c31\u53ef\u4ee5\u8fdb\u884c\u6df1\u62f7\u8d1d\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">123<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kt\">int<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"n\">a<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">456<\/span><span class=\"o\">;<\/span> <span class=\"c1\">\/\/ b\u306b\u4ee3\u5165\u3092\u884c\u306a\u3063\u3066\u3082 a == 123 \u306e\u307e\u307e<\/span>\r\n<\/code><\/pre>\n<p>\u4e00\u65b9\u9762\uff0c\u53c2\u7167\u7c7b\u578b\uff08\u53d8\u91cf\uff09\u5177\u6709\u6307\u5411\u5bf9\u8c61\u7684&#8221;\u5f15\u7528&#8221;\uff0c\u6240\u4ee5\u5982\u679c\u76f4\u63a5\u4f7f\u7528&#8221;=&#8221;\u8fd0\u7b97\u7b26\uff0c\u5c31\u4f1a\u5bfc\u81f4\u5171\u4eab\u76f8\u540c\u7684\u5f15\u7528\u72b6\u6001\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u30b3\u30d4\u30fc\u5143<\/span>\r\n<span class=\"nc\">MyClass<\/span> <span class=\"n\">obj1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">MyClass<\/span><span class=\"o\">();<\/span>\r\n<span class=\"n\">obj1<\/span><span class=\"o\">.<\/span><span class=\"na\">setNum<\/span><span class=\"o\">(<\/span><span class=\"mi\">20<\/span><span class=\"o\">);<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc\uff08\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u3066\u4e2d\u8eab\u306e\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3092\u30b3\u30d4\u30fc\u3059\u308b\uff09<\/span>\r\n<span class=\"nc\">MyClass<\/span> <span class=\"n\">obj2<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">MyClass<\/span><span class=\"o\">();<\/span> <span class=\"c1\">\/\/ \u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u3066\u3044\u308b<\/span>\r\n<span class=\"n\">obj2<\/span><span class=\"o\">.<\/span><span class=\"na\">setNum<\/span><span class=\"o\">(<\/span><span class=\"n\">obj1<\/span><span class=\"o\">.<\/span><span class=\"na\">getNum<\/span><span class=\"o\">());<\/span> <span class=\"c1\">\/\/ \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\uff08int\uff09\u304c\u6e21\u3055\u308c\u308b<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u53c2\u7167\u3092\u5171\u6709\u3057\u3066\u3044\u308b\u72b6\u614b<\/span>\r\n<span class=\"nc\">MyClass<\/span> <span class=\"n\">obj99<\/span> <span class=\"o\">=<\/span> <span class=\"n\">obj1<\/span><span class=\"o\">;<\/span> <span class=\"c1\">\/\/ \u3053\u308c\u3060\u3068\u751f\u6210\u3055\u308c\u308b\u306e\u306f\u300cobj1\u3068\u540c\u3058\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u300d\u3092\u6301\u3063\u305f\u300c\u9055\u3046\u5909\u6570\u300d<\/span>\r\n<\/code><\/pre>\n<h1>\u53ea\u6709String\u7c7b\u578b\u6709\u70b9\u7279\u6b8a<\/h1>\n<p>\u5173\u4e8eString2<\/p>\n<blockquote><p>\u4e00\u4e2aString\u5bf9\u8c61\u5177\u6709\u6052\u5b9a\uff08\u4e0d\u53d8\uff09\u7684\u503c\u3002<br \/>\n\u5b57\u7b26\u4e32\u5b57\u9762\u503c\uff08\u00a73.10.5\uff09\u662f\u5bf9String\u7c7b\u5b9e\u4f8b\u7684\u5f15\u7528\u3002<br \/>\n\u5f53\u7ed3\u679c\u4e0d\u662f\u5e38\u91cf\u8868\u8fbe\u5f0f\uff08\u00a715.28\uff09\u65f6\uff0c\u5b57\u7b26\u4e32\u8fde\u63a5\u8fd0\u7b97\u7b26+\uff08\u00a715.18.1\uff09\u9690\u5f0f\u5730\u521b\u5efa\u4e00\u4e2a\u65b0\u7684String\u5bf9\u8c61\u3002<\/p><\/blockquote>\n<p>\u6839\u636e\u8be5\u5185\u5bb9\uff0c\u6211\u4eec\u5e73\u65f6\u968f\u610f\u4f7f\u7528\u7684\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\uff08\u4f8b\u5982 String foo = &#8220;foo!&#8221;; \u4e2d\u7684 &#8220;foo!&#8221;\uff09\u5e76\u4e0d\u662f\u539f\u59cb\u7c7b\u578b\uff0c\u800c\u662f\u5bf9\u9690\u542b\u751f\u6210\u7684 String \u7c7b\u578b\u5b9e\u4f8b\u7684\u201c\u5f15\u7528\u201d\u3002\u867d\u7136\u5b83\u4eec\u53ef\u4ee5\u8fdb\u884c\u7c7b\u4f3c\u52a0\u6cd5\u7684\u64cd\u4f5c\uff0c\u4f46\u5b9e\u9645\u4e0a\u662f\u751f\u6210\u4e86\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u5e76\u8fd4\u56de\u5bf9\u8be5\u5bf9\u8c61\u7684\u201c\u5f15\u7528\u201d\u3002<\/p>\n<p>\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u6587\u5b57\u76f4\u63a5\u91cf\u4f1a\u5f15\u7528\u76f8\u540c\u7684String\u5bf9\u8c613 4\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">hello<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Hello\"<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">lo<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"lo\"<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"n\">hello<\/span> <span class=\"o\">==<\/span> <span class=\"s\">\"Hello\"<\/span>              <span class=\"c1\">\/\/ true\uff08\u540c\u3058\u6587\u5b57\u5217\u3001\u540c\u3058\u53c2\u7167\uff09<\/span>\r\n<span class=\"n\">hello<\/span> <span class=\"o\">==<\/span> <span class=\"o\">(<\/span><span class=\"s\">\"Hel\"<\/span><span class=\"o\">+<\/span><span class=\"s\">\"lo\"<\/span><span class=\"o\">)<\/span>         <span class=\"c1\">\/\/ true\uff08\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u7d50\u5c40 \"Hello\"\u306b\u306a\u308b\u306e\u3067\uff09<\/span>\r\n<span class=\"n\">hello<\/span> <span class=\"o\">==<\/span> <span class=\"o\">(<\/span><span class=\"s\">\"Hel\"<\/span><span class=\"o\">+<\/span><span class=\"n\">lo<\/span><span class=\"o\">)<\/span>           <span class=\"c1\">\/\/ false\uff08\u6587\u5b57\u5217\u7d50\u5408\u306b\u3088\u3063\u3066\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u305f\uff09<\/span>\r\n<\/code><\/pre>\n<section>JLS-4.3.1 \u5bf9\u8c61\u7684\u793a\u4f8b 4.3.1-2\u3002\u21a9JLS-4.3.3 \u5b57\u7b26\u4e32\u7c7b\u21a9<\/p>\n<p>JLS-3.10.5 \u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u21a9<\/p>\n<p>JLS-12.5 \u65b0\u5efa\u7c7b\u5b9e\u4f8b\u7684\u521b\u5efa\u21a9<\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>(\u672c\u6587\u7ae0\u5047\u8bbe\u57fa\u4e8eJava SE 8\u6216\u4ee5\u4e0a\u7248\u672c) \u6df1\u62f7\u8d1d\u6307\u7684\u662f\u5728\u590d\u5236\u6e90\u548c\u76ee\u6807\u65f6\uff0c\u4e0d\u4f1a\u5bf9\u76ee\u6807\/\u6e90\u4ea7\u751f\u5f71\u54cd\u7684\u4e00\u79cd\u62f7\u8d1d [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31203","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u4e2d\u7684\u6df1\u62f7\u8d1d\u548c\u5f15\u7528\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-27T09:03:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-12T14:49:15+00:00\" \/>\n<meta name=\"author\" content=\"\u96c5, \u609f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u96c5, \u609f\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" 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