{"id":34796,"date":"2024-11-26T17:17:39","date_gmt":"2024-11-26T09:17:39","guid":{"rendered":"https:\/\/fwq.ai\/blog\/34796\/"},"modified":"2024-11-26T17:17:39","modified_gmt":"2024-11-26T09:17:39","slug":"%e6%80%8e%e4%b9%88%e7%bb%99java%e6%95%b0%e7%bb%84%e4%b8%ad%e8%b5%8b%e5%80%bc%e4%b8%ba%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/34796\/","title":{"rendered":"\u600e\u4e48\u7ed9java\u6570\u7ec4\u4e2d\u8d4b\u503c\u4e3a\u7a7a"},"content":{"rendered":"<blockquote><p>\n  java \u4e2d\u5c06\u6570\u7ec4\u5143\u7d20\u8d4b\u503c\u4e3a null \u7684\u65b9\u6cd5\uff1a\u76f4\u63a5\u8d4b\u503c\u4e3a null\u3001\u4f7f\u7528 arrays.fill() \u65b9\u6cd5\u3001\u4f7f\u7528\u5faa\u73af\u3002\u5206\u522b\u4e3a\u76f4\u63a5\u5c06\u5143\u7d20\u8d4b\u503c\u4e3a null\u3001\u4f7f\u7528 fill() \u65b9\u6cd5\u5c06\u90e8\u5206\u6216\u5168\u90e8\u5143\u7d20\u8d4b\u503c\u4e3a null\u3001\u904d\u5386\u6570\u7ec4\u9010\u4e2a\u5143\u7d20\u8d4b\u503c\u4e3a null\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/03\/2024110303123468748.jpg\" class=\"aligncenter\" title=\"\u600e\u4e48\u7ed9java\u6570\u7ec4\u4e2d\u8d4b\u503c\u4e3a\u7a7a\u63d2\u56fe\" alt=\"\u600e\u4e48\u7ed9java\u6570\u7ec4\u4e2d\u8d4b\u503c\u4e3a\u7a7a\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5728 Java \u6570\u7ec4\u4e2d\u8d4b\u503c\u4e3a\u7a7a<\/strong><\/p>\n<p>\u5728 Java \u4e2d\uff0c\u8981\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u8d4b\u503c\u4e3a null\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u6b65\u9aa4\u64cd\u4f5c\uff1a<\/p>\n<p><strong>\u76f4\u63a5\u8d4b\u503c\u4e3a null<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528 null \u4f5c\u4e3a\u8d4b\u503c\u503c\uff0c\u76f4\u63a5\u5c06\u5143\u7d20\u8d4b\u503c\u4e3a null\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>int[] numbers = new int[5];\nnumbers[2] = null; \/\/ \u5c06\u6570\u7ec4\u7b2c 3 \u4e2a\u5143\u7d20 (\u7d22\u5f15\u4e3a 2) \u8d4b\u503c\u4e3a null<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528 Arrays.fill() \u65b9\u6cd5<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<ul>\n<li>\u4f7f\u7528 java.util.Arrays \u7c7b\u4e2d\u7684 fill() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u6574\u4e2a\u6570\u7ec4\u6216\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u586b\u5145\u4e3a\u6307\u5b9a\u7684\u5143\u7d20\u503c\uff0c\u5305\u62ec null\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>int[] numbers = new int[5];\nArrays.fill(numbers, 2, 4, null); \/\/ \u5c06\u6570\u7ec4\u7d22\u5f15\u4e3a 2 \u548c 3 \u7684\u5143\u7d20\u586b\u5145\u4e3a null<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528\u5faa\u73af<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528\u5faa\u73af\u53ef\u4ee5\u904d\u5386\u6570\u7ec4\u5e76\u9010\u4e2a\u5143\u7d20\u8d4b\u503c\u4e3a null\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>int[] numbers = new int[5];\nfor (int i = 0; i &lt; numbers.length; i++) {\n    numbers[i] = null;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>\u5bf9\u4e8e\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff08\u5982 int\u3001double \u7b49\uff09\uff0c\u5c06\u5143\u7d20\u8d4b\u503c\u4e3a null \u4f1a\u5bfc\u81f4 <strong>NullPointerException<\/strong> \u5f02\u5e38\u3002<\/li>\n<li>\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\uff08\u5982\u5bf9\u8c61\u3001\u6570\u7ec4\u7b49\uff09\uff0c\u8d4b\u503c\u4e3a null \u8868\u793a\u8be5\u5143\u7d20\u4e0d\u5f15\u7528\u4efb\u4f55\u5bf9\u8c61\u3002<\/li>\n<li>\u8d4b\u503c\u4e3a null \u4e0d\u4f1a\u5f71\u54cd\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u7ed9java\u6570\u7ec4\u4e2d\u8d4b\u503c\u4e3a\u7a7a\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u4e2d\u5c06\u6570\u7ec4\u5143\u7d20\u8d4b\u503c\u4e3a null \u7684\u65b9\u6cd5\uff1a\u76f4\u63a5\u8d4b\u503c\u4e3a null\u3001\u4f7f\u7528 arrays.fill() \u65b9\u6cd5\u3001\u4f7f\u7528\u5faa\u73af\u3002\u5206\u522b\u4e3a\u76f4\u63a5\u5c06\u5143\u7d20\u8d4b\u503c\u4e3a null\u3001\u4f7f\u7528 fill() \u65b9\u6cd5\u5c06\u90e8\u5206\u6216\u5168\u90e8\u5143\u7d20\u8d4b\u503c\u4e3a null\u3001\u904d\u5386\u6570\u7ec4\u9010\u4e2a\u5143\u7d20\u8d4b\u503c\u4e3a null\u3002 \u5982\u4f55\u5728 Java \u6570\u7ec4\u4e2d\u8d4b\u503c\u4e3a\u7a7a \u5728 Java \u4e2d\uff0c\u8981\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u8d4b\u503c\u4e3a null\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u6b65\u9aa4\u64cd\u4f5c\uff1a \u76f4\u63a5\u8d4b\u503c\u4e3a null \u4f7f\u7528 null \u4f5c\u4e3a\u8d4b\u503c\u503c\uff0c\u76f4\u63a5\u5c06\u5143\u7d20\u8d4b\u503c\u4e3a null\u3002\u4f8b\u5982\uff1a int[] numbers = new int[5]; numbers[2] = null; \/\/ \u5c06\u6570\u7ec4\u7b2c 3 \u4e2a\u5143\u7d20 (\u7d22\u5f15\u4e3a 2) \u8d4b\u503c\u4e3a null \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528 Arrays.fill() \u65b9\u6cd5 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u4f7f\u7528 java.util.Arrays \u7c7b\u4e2d\u7684 fill() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u6574\u4e2a\u6570\u7ec4\u6216\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u586b\u5145\u4e3a\u6307\u5b9a\u7684\u5143\u7d20\u503c\uff0c\u5305\u62ec null\u3002\u4f8b\u5982\uff1a int[] numbers = [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-34796","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34796","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=34796"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34796\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=34796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=34796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=34796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}