{"id":39008,"date":"2024-11-26T17:12:59","date_gmt":"2024-11-26T09:12:59","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39008\/"},"modified":"2024-11-26T17:12:59","modified_gmt":"2024-11-26T09:12:59","slug":"java%e5%87%bd%e6%95%b0%e6%80%8e%e4%b9%88%e8%bf%94%e5%9b%9e%e6%95%b0%e7%bb%84%e7%9a%84%e9%95%bf%e5%ba%a6%e9%99%90%e5%88%b6","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39008\/","title":{"rendered":"java\u51fd\u6570\u600e\u4e48\u8fd4\u56de\u6570\u7ec4\u7684\u957f\u5ea6\u9650\u5236"},"content":{"rendered":"<blockquote><p>\n  java \u51fd\u6570\u901a\u8fc7\u4f7f\u7528 length \u5c5e\u6027\u83b7\u53d6\u6570\u7ec4\u957f\u5ea6\uff0c\u8be5\u5c5e\u6027\u8fd4\u56de\u6570\u7ec4\u5143\u7d20\u6570\u91cf\u3002\u5177\u4f53\u5982\u4e0b\uff1a1. \u901a\u8fc7\u70b9\u8fd0\u7b97\u7b26\u8bbf\u95ee length \u5c5e\u6027\uff08\u4f8b\u5982\uff1amyarray.length\uff09\uff1b2. length \u5c5e\u6027\u4e0d\u53ef\u4fee\u6539\u4e14\u4e0d\u9002\u7528\u4e8e\u591a\u7ef4\u6570\u7ec4\uff1b3. \u7a7a\u6570\u7ec4\u7684 length \u5c5e\u6027\u8fd4\u56de 0\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/15\/2024111521302224189.jpg\" class=\"aligncenter\" title=\"java\u51fd\u6570\u600e\u4e48\u8fd4\u56de\u6570\u7ec4\u7684\u957f\u5ea6\u9650\u5236\u63d2\u56fe\" alt=\"java\u51fd\u6570\u600e\u4e48\u8fd4\u56de\u6570\u7ec4\u7684\u957f\u5ea6\u9650\u5236\u63d2\u56fe\" \/><\/p>\n<p><strong>Java \u51fd\u6570\u5982\u4f55\u8fd4\u56de\u6570\u7ec4\u957f\u5ea6\u7684\u9650\u5236<\/strong><\/p>\n<p><strong>\u56de\u7b54\uff1a<\/strong><\/p>\n<p>Java \u51fd\u6570\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 length \u5c5e\u6027\u6765\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\u3002\u8be5\u5c5e\u6027\u8fd4\u56de\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/p>\n<p><strong>\u5c55\u5f00\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>length \u5c5e\u6027\u53ef\u4ee5\u901a\u8fc7\u70b9\u8fd0\u7b97\u7b26\u8bbf\u95ee\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>int[] myArray = {1, 2, 3};\nint length = myArray.length; \/\/ length = 3<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>length \u5c5e\u6027\u662f\u4e00\u4e2a\u5e38\u91cf\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4e0d\u80fd\u88ab\u4fee\u6539\u3002<\/li>\n<li>length \u5c5e\u6027\u4e0d\u80fd\u7528\u4e8e\u591a\u7ef4\u6570\u7ec4\u3002<\/li>\n<li>\u5982\u679c\u6570\u7ec4\u4e3a null\uff0c\u5219 length \u5c5e\u6027\u5c06\u8fd4\u56de 0\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p>\u4e0b\u9762\u7684 Java \u4ee3\u7801\u793a\u4f8b\u6f14\u793a\u4e86\u5982\u4f55\u4f7f\u7528 length \u5c5e\u6027\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\uff1a<\/p>\n<pre>public class ArrayLengthExample {\n\n    public static void main(String[] args) {\n        int[] numbers = {1, 2, 3, 4, 5};\n\n        \/\/ \u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\n        int length = numbers.length;\n\n        \/\/ \u8f93\u51fa\u6570\u7ec4\u7684\u957f\u5ea6\n        System.out.println(\"\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a\uff1a\" + length); \/\/ \u8f93\u51fa\uff1a\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a\uff1a5\n    }\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u5176\u4ed6\u65b9\u6cd5\uff1a<\/strong><\/p>\n<p>\u9664\u4e86\u4f7f\u7528 length \u5c5e\u6027\uff0c\u8fd8\u6709\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u4f8b\u5982\u4f7f\u7528 [Array.getLength()](https:\/\/docs..com\/javase\/7\/docs\/api\/java\/lang\/reflect\/Array.html#getLength(java.lang.Object)) \u65b9\u6cd5\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u51fd\u6570\u600e\u4e48\u8fd4\u56de\u6570\u7ec4\u7684\u957f\u5ea6\u9650\u5236\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 \u51fd\u6570\u901a\u8fc7\u4f7f\u7528 length \u5c5e\u6027\u83b7\u53d6\u6570\u7ec4\u957f\u5ea6\uff0c\u8be5\u5c5e\u6027\u8fd4\u56de\u6570\u7ec4\u5143\u7d20\u6570\u91cf\u3002\u5177\u4f53\u5982\u4e0b\uff1a1. \u901a\u8fc7\u70b9\u8fd0\u7b97\u7b26\u8bbf\u95ee length \u5c5e\u6027\uff08\u4f8b\u5982\uff1amyarray.length\uff09\uff1b2. length \u5c5e\u6027\u4e0d\u53ef\u4fee\u6539\u4e14\u4e0d\u9002\u7528\u4e8e\u591a\u7ef4\u6570\u7ec4\uff1b3. \u7a7a\u6570\u7ec4\u7684 length \u5c5e\u6027\u8fd4\u56de 0\u3002 Java \u51fd\u6570\u5982\u4f55\u8fd4\u56de\u6570\u7ec4\u957f\u5ea6\u7684\u9650\u5236 \u56de\u7b54\uff1a Java \u51fd\u6570\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 length \u5c5e\u6027\u6765\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\u3002\u8be5\u5c5e\u6027\u8fd4\u56de\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002 \u5c55\u5f00\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b length \u5c5e\u6027\u53ef\u4ee5\u901a\u8fc7\u70b9\u8fd0\u7b97\u7b26\u8bbf\u95ee\uff0c\u5982\u4e0b\u6240\u793a\uff1a int[] myArray = {1, 2, 3}; int length = myArray.length; \/\/ length = 3 \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\uff1a length \u5c5e\u6027\u662f\u4e00\u4e2a\u5e38\u91cf\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4e0d\u80fd\u88ab\u4fee\u6539\u3002 length \u5c5e\u6027\u4e0d\u80fd\u7528\u4e8e\u591a\u7ef4\u6570\u7ec4\u3002 \u5982\u679c\u6570\u7ec4\u4e3a null\uff0c\u5219 length \u5c5e\u6027\u5c06\u8fd4\u56de 0\u3002 \u793a\u4f8b\uff1a \u4e0b\u9762\u7684 Java \u4ee3\u7801\u793a\u4f8b\u6f14\u793a\u4e86\u5982\u4f55\u4f7f\u7528 length \u5c5e\u6027\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\uff1a [&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-39008","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39008","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=39008"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39008\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}