{"id":30980,"date":"2023-01-30T08:08:43","date_gmt":"2022-11-08T09:49:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%b5%81%e5%bc%8fapi\/"},"modified":"2025-08-12T21:42:10","modified_gmt":"2025-08-12T13:42:10","slug":"java-%e6%b5%81%e5%bc%8fapi","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%b5%81%e5%bc%8fapi\/","title":{"rendered":"Java &#8211; \u6d41\u5f0fAPI"},"content":{"rendered":"<h2>\u8fd9\u662f\u6211\u5199\u7684\u6587\u7ae0\u7684\u524d\u8a00\u3002\u9019\u6b21\u958b\u59cb\u4e0d\u50c5\u50c5\u662f\u7d14\u7cb9\u5beb\u4f5c\uff0c\u9084\u6703\u5728\u6587\u7ae0\u4e2d\u52a0\u5165\u5167\u5fc3\u7684\u8072\u97f3\u3002\u7531\u65bc\u6b63\u5728\u52aa\u529b\u5b78\u7fd2Java Gold\u8a8d\u8b49\uff0c\u5982\u679c\u80fd\u5f97\u5230\u540c\u6a23\u5728\u5b78\u7684\u4eba\u7684\u5171\u9cf4\uff0c\u6211\u6703\u611f\u5230\u5f88\u958b\u5fc3&#8230;\u203b\u4e3b\u4eba\u662f\u5e38\u6ed1\u5e02\u51fa\u8eab<\/p>\n<h2>&#8220;StreamAPI\uff1f\u90a3\u662f\u4ec0\u4e48\u4e1c\u897f\u554a&#8221;\u7a81\u7136\u51fa\u73b0\u4e86 StreamAPI\uff01\u4f5c\u4e3a\u53ea\u6709\u9ed1\u4e66\u7684\u4eba\uff0c\u611f\u89c9\u597d\u7a81\u7136\u554a\uff01\u771f\u662f\u975e\u5e38\u62b1\u6b49\u554a\uff01\u542c\u8bf4\u5728 Java Gold \u4e2d\u7ecf\u5e38\u9047\u5230\u8fd9\u4e2a\u95ee\u9898&#8230;<\/p>\n<p>\u300c\u7b2c\u4e00\u9898 \u5173\u4e8eOptional\u7c7b&#8230;\uff08\u54ce\u5440\uff0c\u4e0d\u662fStreamAPI\u5417\uff01\uff09\u300d<br \/>\n\u6211\u539f\u672c\u4ee5\u4e3a\u53ea\u9700\u8981\u8bb0\u4f4fStreamAPI\u7684\u65b9\u6cd5\u4f7f\u7528\u5c31\u597d\u4e86\uff0c\u7ed3\u679c\u600e\u4e48\u53c8\u5192\u51faOptional\u6765\u4e86&#8230;<br \/>\n\u603b\u4e4b\uff0c\u6682\u65f6\u5148\u67e5\u4e00\u4e0b\u76f8\u5173\u8d44\u6599\u548c\u9ed1\u76ae\u4e66\u7684\u5185\u5bb9\u5427\u3002<\/p>\n<p>## \u53ef\u9009\u7684\u7c7b (optional class)<\/p>\n<blockquote><p>Java SE 8\u5f15\u5165\u7684java.util.Optional\u662f\u4e00\u79cd\u7528\u4e8e\u5904\u7406\u65b9\u6cd5\u8fd4\u56de\u7ed3\u679c\u7684\u7c7b\uff0c\u65e0\u8bba\u5904\u7406\u7ed3\u679c\u662f\u6b63\u5e38\u8fd8\u662f\u5f02\u5e38\uff0c\u90fd\u53ef\u4ee5\u4ee5\u76f8\u540c\u7684\u7c7b\u578b\u8fdb\u884c\u5904\u7406\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u7c7b\uff0c\u53ef\u4ee5\u51cf\u5c11\u5173\u4e8e\u5f02\u5e38\u5904\u7406\u7684\u4ee3\u7801\uff0c\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002&#8211;\u5f15\u81ea\u9ed2\u672c\u89e3\u8aac<\/p><\/blockquote>\n<p>\u300c\u4f60\u8bf4\u4ec0\u4e48\u5462\uff1f\u8fd9\u4e2a\u4e1c\u897f\u5df2\u7ecf\u5f88\u65b9\u4fbf\u4e86\uff0c\u8fd8\u8bf4\u4ec0\u4e48\u8981\u7528\u5462\uff1f\u4e61\u4e0b\u4eba\u771f\u662f\u8ddf\u4e0d\u4e0a\u65f6\u4ee3\u554a\uff01\u300d<\/p>\n<p>&#8220;\u6682\u65f6\u5148\u770b\u770b\u6837\u672c\u4ee3\u7801\u5427\u2026&#8221;<\/p>\n<h3>\u793a\u4f8b\u4ee3\u7801\u203b\u6211\u5728\u6e90\u4ee3\u7801\u4e2d\u968f\u610f\u6dfb\u52a0\u4e86\u4e00\u4e9b\u6ce8\u91ca\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">OldTest<\/span> <span class=\"o\">{<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"c1\">\/\/\/getFromArray\u30e1\u30bd\u30c3\u30c9\u306f\u914d\u5217\u304b\u3089\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u3092\u623b\u3059<\/span>\r\n\t\t\t<span class=\"nc\">String<\/span> <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">getFromArray<\/span><span class=\"o\">(<\/span><span class=\"k\">new<\/span> <span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"o\">{<\/span> <span class=\"s\">\"A\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"B\"<\/span><span class=\"o\">,<\/span> <span class=\"kc\">null<\/span> <span class=\"o\">},<\/span> <span class=\"mi\">3<\/span><span class=\"o\">);<\/span>\r\n\t\t\t\r\n\t\t\t<span class=\"c1\">\/\/result\u304cnull\u306e\u6642\u306fempty\u3068\u51fa\u529b<\/span>\r\n\t\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">result<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t\t<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\">\"empty\"<\/span><span class=\"o\">);<\/span>\r\n\t\t\t\t<span class=\"k\">return<\/span><span class=\"o\">;<\/span>\r\n\t\t\t<span class=\"o\">}<\/span>\r\n\t\t\t\r\n\t\t\t<span class=\"c1\">\/\/result\u304cnull\u3067\u306a\u3051\u308c\u3070result\u3092\u51fa\u529b<\/span>\r\n\t\t\t<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\">result<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">IllegalArgumentException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<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\">\"exception\"<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"no\">T<\/span> <span class=\"nf\">getFromArray<\/span><span class=\"o\">(<\/span><span class=\"no\">T<\/span><span class=\"o\">[]<\/span> <span class=\"n\">array<\/span><span class=\"o\">,<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">index<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\r\n\t\t<span class=\"c1\">\/\/array\u304cnull\u306e\u6642\u306f\u4f8b\u5916\u3092throw<\/span>\r\n\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">array<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">IllegalArgumentException<\/span><span class=\"o\">();<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t\t\r\n\t\t<span class=\"c1\">\/\/\u6307\u5b9a\u3055\u308c\u305findex\u756a\u53f7\u306e\u8981\u7d20\u3092\u8fd4\u3059<\/span>\r\n\t\t<span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"n\">array<\/span><span class=\"o\">[<\/span><span class=\"n\">index<\/span><span class=\"o\">];<\/span>\r\n\t\t<span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">ArrayIndexOutOfBoundsException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">IllegalArgumentException<\/span><span class=\"o\">();<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>(\u89e3\u91ca) &#8220;\u4f7f\u7528getFromArray\u65b9\u6cd5\u65f6\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b4\u70b9\uff1a<br \/>\n1. \u53c2\u6570\u6570\u7ec4\u662f\u5f15\u7528\u7c7b\u578b&#8230;&#8230;&#8221;<\/p>\n<p>\u7b49\u4e00\u4e0b\uff01\u8bf7\u4e0d\u8981\u7528\u793a\u4f8b\u4ee3\u7801\u589e\u52a0\u95ee\u9898\uff01<\/p>\n<p>\u5f53\u6211\u5728\u8c03\u67e5\u4e0d\u61c2\u7684\u4e8b\u60c5\u65f6\uff0c\u4f1a\u51fa\u73b0\u66f4\u4e0d\u61c2\u7684\u4e8b\u60c5\u3002\u800c\u5f53\u6211\u8c03\u67e5\u90a3\u4e9b\u4e8b\u60c5\u65f6\uff0c\u53c8\u4f1a\u51fa\u73b0\u66f4\u66f4\u4e0d\u61c2\u7684\u4e8b\u60c5&#8230;\u76f4\u5230\u6211\u53bb\u63a2\u7d22\u5b87\u5b99\u7684\u8d77\u6e90\u4e3a\u6b62&#8230;<\/p>\n<p>\u4ee5\u4e0b\u662f\u7531\u6076\u9b54\u7684\u9b54\u5bfc\u4e66\uff08\u9ed1\u672c\uff09\u5f15\u53d1\u7684\u7591\u70b9\u3002<\/p>\n<h4>\u79c1\u6709\u7684\u9759\u6001\u65b9\u6cd5\uff0c\u4ece\u6570\u7ec4\u4e2d\u53d6\u51fa\u6307\u5b9a\u7d22\u5f15\u7684\u5143\u7d20\u3002<\/p>\n<h4>\u300c\u867d\u7136\u505a\u4e86\u5f88\u591a\u5f02\u5e38\u5904\u7406\uff0c\u4f46\u5230\u5e95\u662f\u4ec0\u4e48\u5f02\u5e38\u5462\uff1f\u8fd9\u4e2a\u4eba\u771f\u662f\u5fd9\u554a\uff0c\u603b\u662f\u5728\u505atry-catch\u554a\u3001throw\u554a\u4e4b\u7c7b\u7684\u4e8b\u60c5\u3002\u300d\u975e\u5e38\u5e78\u8fd0\u7684\u662f\uff0c\u5728\u8fd9\u6b21\u60c5\u51b5\u4e0b\uff0c\u4e0d\u9700\u8981\u8c03\u67e5\u5b87\u5b99\u7684\u8d77\u6e90\uff0c\u53ea\u8981\u95ee\u95eeChatGPT\u8001\u5e08\u5c31\u884c\u4e86\u3002&#8221;&#8230;&#8230;\u4f60\u80fd\u4e0d\u80fd\u5e2e\u6211\u53c2\u52a0\u8003\u8bd5\u5440(\u00b4;\u03c9;\uff40)&#8221;<\/p>\n<h2>\u2460&#8221;\u7684\u771f\u5b9e\u8eab\u4efd<br \/>\n\u300cT\u662f\u4ec0\u4e48\u610f\u601d\uff1f\u662f\u6307Twice\u5417\uff1f\u8fd8\u662f\u6307TT\u5144\u5f1f\uff1f\u8fd8\u662fD\u7684\u4e00\u65cf\uff1f\u8fd8\u662f\u5728\u8c08\u8bba\u300a\u822a\u6d77\u738b\u300b\uff1f\u300d<\/p>\n<p>\u6839\u636eChatGpt\u5148\u751f\u7684\u8bf4\u6cd5\uff0c\u5148\u4e0d\u8981\u8003\u8651\u65e0\u804a\u7684\u51b7\u7b11\u8bdd&#8230;<\/p>\n<blockquote><p>\u9019\u662f\u5728\u8ac7\u8ad6Java\u7684\u6cdb\u578b\uff08Generics\uff09\u3002\u6cdb\u578b\u662f\u70ba\u4e86\u63d0\u9ad8\u4ee3\u78bc\u7684\u91cd\u7528\u6027\u548c\u985e\u578b\u5b89\u5168\u6027\u800c\u5f15\u5165\u7684\u529f\u80fd\u3002<br \/>\n\u6cdb\u578b\u88ab\u7a31\u70ba\u985e\u578b\u53c3\u6578\uff08Type Parameter\uff09\uff0c\u7528\u65bc\u8868\u793a\u4efb\u610f\u985e\u578b\u3002\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u5b83\u88ab\u7528\u65bc\u4f7f\u65b9\u6cd5\u7684\u8fd4\u56de\u985e\u578b\u548c\u53c3\u6578\u985e\u578b\u6210\u70ba\u6cdb\u578b\u985e\u578b\u3002<\/p><\/blockquote>\n<p>\u603b\u4e4b\uff0c\u5982\u679c\u5728\u65b9\u6cd5\u524d\u52a0\u4e0a\u201c\u5bf9\u4e8e\u201d\uff0c\u90a3\u5c31\u662f\u6307\u4ee5\u8be5\u7c7b\u578b\u63a5\u6536\u53c2\u6570\u5e76\u8fd4\u56de\u76f8\u540c\u7c7b\u578b\u7684\u610f\u601d\u3002<\/p>\n<p>\u5e38\u89c1\u7684\u662f\u5728List\u7c7b\u4e0a\u6307\u5b9a\u7c7b\u578b\u7684\u90a3\u4e00\u90e8\u5206\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/\/\u5165\u308c\u3089\u308c\u308b\u578b\u304cString\u578b\u306b\u9650\u5b9a\u3055\u308c\u308b<\/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\">arr<\/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<\/code><\/pre>\n<p>\u5173\u4e8e\u6cdb\u578b\u7c7b\u578b\u5c31\u5148\u8bf4\u5230\u8fd9\u91cc\u5427&#8230;\uff08\u6df1\u5165\u8c03\u67e5\u5f00\u59cb\u4f1a\u8ff7\u5931\u5728\u5b87\u5b99\u4e2d&#8230;\uff09<br \/>\n\u4ee5\u8fd9\u4e2a\u4f8b\u5b50\u6765\u8bf4\uff0cgetFromArray\u65b9\u6cd5\u53ef\u4ee5\u63a5\u53d7\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u8fd4\u56de\u8be5\u6570\u7ec4\u6307\u5b9a\u7d22\u5f15\u53f7\u7684\u5143\u7d20\u3002<\/p>\n<h2>2. \u5f15\u51fa\u4f8b\u5916\u60c5\u51b5\u66ab\u6642\u4f86\u8aaa\uff0c\u9019\u6b21\u51fa\u73fe\u7684\u4f8b\u5916\u6709\u4ee5\u4e0b\u4e09\u7a2e\u60c5\u6cc1\u3002<\/p>\n<div>\n<div class=\"post-table\">\u4f8b\u5916throw\u306e\u6761\u4ef6IllegalArgumentException\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3055\u308c\u305f\u5f15\u6570\u304c\u7121\u52b9\u307e\u305f\u306f\u4e0d\u6b63ArrayIndexOutOfBoudsException\u914d\u5217\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u7bc4\u56f2\u5916NullPointerException(\u2190\u3053\u308c\u306f\u89e3\u8aac\u3067\u51fa\u3066\u304d\u305f\u306e\u3067\u4e00\u5fdc\u7d39\u4ecb\uff09null\u306e\u53c2\u7167\u3092\u4f7f\u7528\u3057\u3088\u3046\u3068\u3059\u308b\u7531\u4e8e\u2191\u662f\u65e0\u68c0\u67e5\u5f02\u5e38\uff08Unchecked Exception\uff09\uff0c\u6240\u4ee5\u5728\u65b9\u6cd5\u7b7e\u540d\u4e2d\u4e0d\u9700\u8981\u4f7f\u7528throws\u5173\u952e\u5b57\u8fdb\u884c\u58f0\u660e\uff08\u65b9\u6cd5\u540d\u53ca\u5176\u53c2\u6570\u7684\u7c7b\u578b\u3001\u6570\u91cf\u548c\u987a\u5e8f\u7b49\u90e8\u5206\uff09\u3002<\/p>\n<p>\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u6211\u5728Java Silver\u8003\u8bd5\u4e2d\u9047\u5230\u4e86\u5173\u4e8e\u5f02\u5e38\u7684\u95ee\u9898\u3002<\/p>\n<blockquote><p>\u5f02\u5e38\u68c0\u67e5\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\uff0c\u901a\u8fc7\u5f3a\u5236\u5f02\u5e38\u5904\u7406\u6765\u6355\u6349\u9519\u8bef\u5e76\u8fdb\u884c\u9002\u5f53\u7684\u6062\u590d\u5904\u7406\u3002\u4e0e\u6b64\u76f8\u53cd\uff0c\u975e\u68c0\u67e5\u5f02\u5e38\u8868\u793a\u610f\u5916\u9519\u8bef\u6216\u8fd0\u884c\u65f6\u9519\u8bef\uff0c\u8868\u660e\u5f88\u96be\u7ee7\u7eed\u7a0b\u5e8f\u7684\u6b63\u5e38\u6267\u884c\u3002<\/p><\/blockquote>\n<p>\u8c22\u8c22\uff0cChatGpt\u8001\u5e08\uff01\u56e0\u4e3a\u7f16\u8f91\u5668\u603b\u662f\u81ea\u52a8\u5e2e\u6211\u751f\u6210\uff0c\u6240\u4ee5\u6211\u7ecf\u5e38\u4f1a\u5fd8\u8bb0\u54e6\u3002<\/p>\n<p>\u300c\u55ef\uff1f\u8bb0\u4f4f\u5728Silver\u91cc\u505a\u8fc7\u7684\u4e8b\u60c5\u5417\uff1f\u300d<\/p>\n<p>\u300c&#8230;\u300d<\/p>\n<p>&#8220;\u55ef\uff1f\u53d1\u751f\u4e86\u4ec0\u4e48\u4e8b\uff1f&#8221;<\/p>\n<h2>\u56de\u5230\u5b87\u5b99\uff0c\u7136\u540e\u8fdb\u5165\u6b63\u9898\u3002\u6211\u7ec8\u4e8e\u53ef\u4ee5\u56de\u5230\u6b63\u9898\u4e86&#8230; (W\u01d2 hu\u00ed &#8230;)<\/p>\n<p>\u636e\u89e3\u91ca\uff0c\u6839\u636e\u6837\u672c\u4ee3\u7801\uff0c\u4f3c\u4e4e\u5b58\u5728\u4ee5\u4e0b\u56db\u4e2a\u95ee\u9898\u3002\u800c\u4e14\u636e\u8bf4\u53ea\u8981\u4f7f\u7528Optional\u7c7b\u5c31\u53ef\u4ee5\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7531\u4e8e\u53c2\u6570\u6570\u7ec4\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u6240\u4ee5\u6709\u53ef\u80fd\u4f20\u9012null\u503c\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f20\u9012\u7684\u53c2\u6570\u7d22\u5f15\u53ef\u80fd\u8d85\u8fc7\u6570\u7ec4\u7684\u5143\u7d20\u8303\u56f4\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u6570\u7ec4\u5143\u7d20\u53ef\u80fd\u4e3a\u7a7a\uff0c\u5982\u679c\u63a5\u6536\u8fd4\u56de\u503c\u7684\u4e00\u65b9\u4e0d\u8fdb\u884c\u7a7a\u503c\u68c0\u67e5\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4java.lang.NullPointerException\u5f02\u5e38\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u629b\u51fa\u7684java.lang.IllegalArgumentException\u662f\u975e\u68c0\u67e5\u5f02\u5e38\uff0c\u53ef\u80fd\u4f1a\u88ab\u5ffd\u7565\u5f02\u5e38\u5904\u7406\u3002<\/ol>\n<p>\u300c\u771f\u7684\u5417\uff1f\u300d<\/p>\n<h4>1. \u7531\u4e8e\u53c2\u6570\u6570\u7ec4\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u53ef\u80fd\u4f1a\u4f20\u5165null\u3002<\/p>\n<h4>2. \u53ef\u80fd\u5b58\u5728\u4f20\u9012\u53c2\u6570\u4e2d\u7684\u7d22\u5f15\u8d85\u8fc7\u6570\u7ec4\u5143\u7d20\u7684\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">getFromArray<\/span><span class=\"o\">(<\/span><span class=\"k\">new<\/span> <span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"o\">{<\/span> <span class=\"s\">\"A\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"B\"<\/span><span class=\"o\">,<\/span> <span class=\"kc\">null<\/span> <span class=\"o\">},<\/span> <span class=\"mi\">3<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>&#8220;\u786e\u5b9e\uff0c\u8be5\u5f15\u7528\u4e86\u4e00\u4e2aString\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u4e14\u6307\u5b9a\u4e86\u7d22\u5f15\u4e3a3\uff0c\u8d85\u51fa\u4e86\u5143\u7d20\u6570\u91cf&#8230;&#8221;<\/p>\n<p>&#8220;\u55ef\uff0c\u4e5f\u8bb8\u53ea\u662f\u56e0\u4e3a\u8fd9\u662f\u793a\u4f8b\u4ee3\u7801\uff0c\u6240\u4ee5\u6ca1\u6709\u4f7f\u7528\u65b9\u6cd5\u53c2\u6570\uff0c\u800c\u662f\u5728\u65b9\u6cd5\u5185\u90e8\u4f7f\u7528\u4e86\u751f\u6210\u7684\u6570\u7ec4\uff0c\u8fd9\u5e94\u8be5\u5f88\u660e\u663e\u5427&#8230;\u603b\u4e4b\uff0c\u5b83\u7684\u7ed3\u6784\u5f88\u5947\u602a\uff0c\u5e76\u4e0d\u662f\u5173\u4e8e\u53ef\u80fd\u6027\u4e4b\u7c7b\u7684\u95ee\u9898&#8230;&#8221;<\/p>\n<p>\u300c\u5c0f\u65f6\u5019\uff0c\u6211\u5bf9\u4e8e\u90a3\u4e9b\u4e0d\u5728\u540c\u4e00\u65f6\u95f4\u79bb\u5bb6\u7684\u5144\u5f1f\u548c\u70b9P\u7684\u8fd0\u52a8\u6beb\u4e0d\u5728\u610f\u3002\u4f46\u73b0\u5728\uff0c\u611f\u89c9\u771f\u662f\u8ba9\u4eba\u751f\u6c14\u3002\u300d<\/p>\n<h4>3. \u6570\u7ec4\u7684\u5143\u7d20\u53ef\u80fd\u4e3a\u7a7a\uff0c\u5982\u679c\u6ca1\u6709\u5728\u63a5\u6536\u8fd4\u56de\u503c\u7684\u4e00\u65b9\u8fdb\u884c\u7a7a\u503c\u68c0\u67e5\uff0c\u53ef\u80fd\u4f1a\u5f15\u53d1java.lang.NullPointerException\u5f02\u5e38\u3002\u82e5\u5728getFromArray\u65b9\u6cd5\u4e2d\u5c06\u7d22\u5f15\u6570\u8bbe\u4e3a2\uff0c\u6307\u5b9anull\u5143\u7d20\uff0c\u5c06\u4f1a\u5f15\u53d1\u5f02\u5e38\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">getFromArray<\/span><span class=\"o\">(<\/span><span class=\"k\">new<\/span> <span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"o\">{<\/span> <span class=\"s\">\"A\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"B\"<\/span><span class=\"o\">,<\/span> <span class=\"kc\">null<\/span> <span class=\"o\">},<\/span> <span class=\"mi\">3<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/NUllPointerException\u304c\u767a\u751f<\/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\">result<\/span><span class=\"o\">.<\/span><span class=\"na\">length<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u4e5f\u4e0d\u662f\u56e0\u4e3a\u5904\u7406\u7ed3\u679c\u53d8\u6210\u4e86null\uff0c\u800c\u662f\u56e0\u4e3a\u81ea\u5df1\u628a\u5b83\u53d8\u6210\u4e86null\uff0c\u611f\u89c9\u6709\u70b9\u50bb\u3002<\/p>\n<p>\u56e0\u4e3a\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff0c\u8bf7\u539f\u751f\u5730\u7528\u4e2d\u6587\u6362\u53e5\u8bdd\u8bf4\uff1a\u201c\u8fd9\u53ea\u662f\u4e2a\u6837\u672c\uff0c\u6240\u4ee5\u4f60\u662f\u5728\u4e3a\u6211\u626e\u6f14\u50bb\u74dc\u5417\uff01\u2026\u545c\u545c(\u00b4;\u03c9;\uff40)\u8c22\u8c22\uff01\u201d<\/p>\n<h4>\u7531\u4e8ejava.lang.IllegalArgumentException\u662f\u4e00\u79cd\u672a\u68c0\u67e5\u7684\u5f02\u5e38\uff0c\u6240\u4ee5\u6709\u53ef\u80fd\u4f1a\u88ab\u5ffd\u7565\u5f02\u5e38\u5904\u7406\u3002\u300c\u6ca1\u6709\u4f8b\u5916\u88ab\u5ffd\u89c6\uff01\uff1f\u8fd9\u662f\u4ec0\u4e48\u610f\u601d\uff1f\uff1f\u300d<br \/>\n\u300cChatGpt\u8001\u5e08\uff01\u300d<\/p>\n<h4>ChatGpt\u7684\u7b54\u590d\uff1a\u5ffd\u7565\u5f02\u5e38\u7684\u6a21\u5f0f\u3002<\/p>\n<ol>\u5982\u679c\u6ca1\u6709catch\u5757\u5b58\u5728\uff1a\u5373\u4f7f\u53d1\u751f\u4e86\u672a\u68c0\u67e5\u5f02\u5e38\uff0c\u5982\u679c\u6ca1\u6709\u76f8\u5e94\u7684catch\u5757\u6765\u6355\u83b7\u8be5\u5f02\u5e38\uff0c\u5f02\u5e38\u5904\u7406\u5c06\u88ab\u5ffd\u7565\u3002<\/ol>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">someMethod<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">RuntimeException<\/span><span class=\"o\">(<\/span><span class=\"s\">\"An exception occurred\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">anotherMethod<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">someMethod<\/span><span class=\"o\">();<\/span> <span class=\"c1\">\/\/ \u4f8b\u5916\u304c\u30b9\u30ed\u30fc\u3055\u308c\u308b\u304c\u3001catch\u30d6\u30ed\u30c3\u30af\u304c\u5b58\u5728\u3057\u306a\u3044\u305f\u3081\u7121\u8996\u3055\u308c\u308b<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ol>\u5982\u679c\u5728catch\u5757\u4e2d\u6ca1\u6709\u518d\u6b21\u629b\u51fa\u5f02\u5e38\uff1a\u5373\u4f7f\u6355\u83b7\u5230\u975e\u68c0\u67e5\u5f02\u5e38\uff0c\u4e5f\u53ef\u4ee5\u9009\u62e9\u5ffd\u7565\u5b83\u800c\u4e0d\u518d\u6b21\u629b\u51fa\u3002<\/ol>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">someMethod<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/ \u4f55\u3089\u304b\u306e\u51e6\u7406<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">RuntimeException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/ \u4f8b\u5916\u304c\u30ad\u30e3\u30c3\u30c1\u3055\u308c\u308b\u304c\u3001\u518d\u5ea6\u30b9\u30ed\u30fc\u3055\u308c\u305a\u306b\u7121\u8996\u3055\u308c\u308b<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u300c\u55ef\uff0c\u8fd9\u4e2a&#8217;\u65e0\u89c6&#8217;\u6307\u7684\u4e0d\u662f\u7cfb\u7edf\u81ea\u52a8\u5ffd\u7565\uff0c\u800c\u662f\u7a0b\u5e8f\u5458\u9009\u62e9\u5ffd\u7565\u7684\u610f\u601d\u554a\u300d<br \/>\n\u300c\u55ef\uff0c\u4e5f\u4e0d\u662f\u5b8c\u5168\u6ca1\u6709&#8230;\u300d<\/p>\n<h3>\u4f7f\u7528Optional\u7c7b\u7684\u89e3\u51b3\u65b9\u6848\u3002<br \/>\n&#8220;\u7ec8\u4e8e\u80fd\u56de\u5230Optional\u7c7b\u7684\u8ba8\u8bba\u4e86&#8221;<br \/>\n&#8220;\u54ce\u5440\uff0c\u4eca\u5929\u4e0d\u662f\u5728\u5b66\u4e60streamAPI\u5417&#8230;?&#8221;<\/p>\n<p>\u5148\u770b\u770b\u6211\u9644\u4e0a\u4e86\u8bb8\u591a\u8bc4\u8bba\u7684\u6837\u672c\u5427\uff01<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">java.util.Optional<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">OldTest<\/span> <span class=\"o\">{<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"c1\">\/\/\u304a\u30d0\u30ab\u306a\u306e\u3067\u914d\u5217\u306eindex\u6570\u3092\u8d85\u3048\u305f\u5024\u3092\u6307\u5b9a\u3057\u3066\u3057\u307e\u3063\u3066\u308b\uff01<\/span>\r\n\t\t<span class=\"nc\">Optional<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">getFromArray<\/span><span class=\"o\">(<\/span><span class=\"k\">new<\/span> <span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"o\">{<\/span> <span class=\"s\">\"A\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"B,\"<\/span><span class=\"o\">,<\/span> <span class=\"kc\">null<\/span> <span class=\"o\">},<\/span> <span class=\"mi\">3<\/span><span class=\"o\">);<\/span>\r\n\t\t\r\n\t\t<span class=\"c1\">\/\/getFromArray\u30e1\u30bd\u30c3\u30c9\u5074\u3067\u4f8b\u5916\u304c\u51fa\u308b\u3068\u304d\u306f\"empty\"\u3092\u8fd4\u3059\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u3066<\/span>\r\n\t\t<span class=\"c1\">\/\/try-catch\u3092\u306a\u304f\u3059\u3053\u3068\u304c\u3067\u304d\u305f\u306d\uff01<\/span>\r\n\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">result<\/span><span class=\"o\">.<\/span><span class=\"na\">isEmpty<\/span><span class=\"o\">())<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<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\">\"empty\"<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"k\">return<\/span><span class=\"o\">;<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t\t<span class=\"c1\">\/\/\u4f8b\u5916\u304c\u306a\u3051\u308c\u3070\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b<\/span>\r\n\t\t<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\">result<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">());<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"nc\">Optional<\/span><span class=\"o\">&lt;<\/span><span class=\"no\">T<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">getFromArray<\/span><span class=\"o\">(<\/span><span class=\"no\">T<\/span><span class=\"o\">[]<\/span> <span class=\"n\">array<\/span><span class=\"o\">,<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">index<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\r\n\t\t<span class=\"c1\">\/\/NullPointerException\u3092\u56de\u907f\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b<\/span>\r\n\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">array<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"nc\">Optional<\/span><span class=\"o\">.<\/span><span class=\"na\">empty<\/span><span class=\"o\">();<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\r\n\t\t<span class=\"c1\">\/\/\u6307\u5b9a\u3055\u308c\u305findex\u756a\u53f7\u306e\u8981\u7d20\u3092\u8fd4\u3059<\/span>\r\n\t\t<span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"nc\">Optional<\/span><span class=\"o\">.<\/span><span class=\"na\">ofNullable<\/span><span class=\"o\">(<\/span><span class=\"n\">array<\/span><span class=\"o\">[<\/span><span class=\"n\">index<\/span><span class=\"o\">]);<\/span>\r\n\t\t<span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">ArrayIndexOutOfBoundsException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"nc\">Optional<\/span><span class=\"o\">.<\/span><span class=\"na\">empty<\/span><span class=\"o\">();<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u300c \u53ef\u9009\u7684 \u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6&#8230;.\u662f\u4ec0\u4e48\u610f\u601d\u300d<\/p>\n<p>\u300c \u8fd8\u662f\u7edd\u5bf9\u662fTWICE\u561b&#8230;\u300d\u5bf9\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u627e\u4e0d\u5230\u4ee4\u4eba\u6ee1\u610f\u7684\u7b54\u6848\uff0c\u6240\u4ee5\u4e00\u65e6\u6211\u7406\u89e3\u4e86\uff0c\u6211\u4f1a\u52a0\u4e0a\u8bf4\u660e\u3002<\/p>\n<p>\u9019\u6b21\u5c31\u5230\u9019\u88e1\u5427\u3002\u7d50\u679c\u6211\u9084\u662f\u6c92\u6709\u638c\u63e1StreamAPI\uff0c\u53ea\u89e3\u4e86\u4e00\u500b\u9ed1\u9b54\u6cd5\u66f8\uff08\u9ed1\u672c\uff09\u7684\u554f\u984c&#8230;<\/p>\n<p>SE\u592a\u96be\u4e86<br \/>\n\u203b\u4e0b\u6b21\u4e5f\u662f\u53ef\u9009\u7684\u8c03\u67e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6211\u5199\u7684\u6587\u7ae0\u7684\u524d\u8a00\u3002\u9019\u6b21\u958b\u59cb\u4e0d\u50c5\u50c5\u662f\u7d14\u7cb9\u5beb\u4f5c\uff0c\u9084\u6703\u5728\u6587\u7ae0\u4e2d\u52a0\u5165\u5167\u5fc3\u7684\u8072\u97f3\u3002\u7531\u65bc\u6b63\u5728\u52aa\u529b\u5b78\u7fd2Java Gold [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30980","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\/ -->\n<title>Java - \u6d41\u5f0fAPI - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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