{"id":39220,"date":"2024-11-26T14:07:58","date_gmt":"2024-11-26T06:07:58","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39220\/"},"modified":"2024-11-26T14:07:58","modified_gmt":"2024-11-26T06:07:58","slug":"java%e6%80%8e%e4%b9%88%e5%a4%8d%e5%88%b6%e5%ad%97%e8%8a%82%e6%95%b0%e7%bb%84%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39220\/","title":{"rendered":"java\u600e\u4e48\u590d\u5236\u5b57\u8282\u6570\u7ec4\u4e2d"},"content":{"rendered":"<blockquote><p>\n  java\u4e2d\u590d\u5236\u5b57\u8282\u6570\u7ec4\u53ef\u4f7f\u7528arrays.copyof()\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u539f\u6570\u7ec4\u548c\u65b0\u6570\u7ec4\u957f\u5ea6\u3002\u5176\u4ed6\u590d\u5236\u65b9\u6cd5\u5305\u62ecsystem.arraycopy()\u3001clone()\u548c\u6784\u9020\u51fd\u6570\uff0c\u9009\u62e9\u65b9\u6cd5\u65f6\u5e94\u8003\u8651\u590d\u5236\u5927\u5c0f\u3001\u590d\u6742\u6027\u548c\u6027\u80fd\u8981\u6c42\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111605262017028.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u590d\u5236\u5b57\u8282\u6570\u7ec4\u4e2d\u63d2\u56fe\" alt=\"java\u600e\u4e48\u590d\u5236\u5b57\u8282\u6570\u7ec4\u4e2d\u63d2\u56fe\" \/><\/p>\n<p><strong>Java \u4e2d\u590d\u5236\u5b57\u8282\u6570\u7ec4<\/strong><\/p>\n<p><strong>\u5982\u4f55\u590d\u5236\u5b57\u8282\u6570\u7ec4\uff1f<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5\u590d\u5236\u5b57\u8282\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u8981\u590d\u5236\u7684\u539f\u59cb\u6570\u7ec4\u548c\u590d\u5236\u540e\u7684\u65b0\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>byte[] originalArray = {1, 2, 3, 4, 5};\nbyte[] copyArray = Arrays.copyOf(originalArray, 3);\n\n\/\/ \u8f93\u51fa\u590d\u5236\u540e\u7684\u6570\u7ec4\nSystem.out.println(Arrays.toString(copyArray)); \/\/ \u8f93\u51fa\uff1a[1, 2, 3]<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u590d\u5236\u6570\u7ec4\u7684\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<ul>\n<li>\u590d\u5236\u540e\u7684\u6570\u7ec4\u5fc5\u987b\u5177\u6709\u5927\u4e8e\u6216\u7b49\u4e8e\u539f\u59cb\u6570\u7ec4\u957f\u5ea6\u7684\u957f\u5ea6\u3002<\/li>\n<li>\u5982\u679c\u590d\u5236\u540e\u7684\u6570\u7ec4\u957f\u5ea6\u5c0f\u4e8e\u539f\u59cb\u6570\u7ec4\u957f\u5ea6\uff0c\u5219\u53ea\u590d\u5236\u5230\u590d\u5236\u540e\u7684\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a\u6b62\u3002<\/li>\n<li>\u590d\u5236\u540e\u7684\u6570\u7ec4\u662f\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5b83\u4e0e\u539f\u59cb\u6570\u7ec4\u72ec\u7acb\u3002\u5bf9\u590d\u5236\u6570\u7ec4\u7684\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u6570\u7ec4\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/li>\n<\/ul>\n<p><strong>\u5176\u4ed6\u590d\u5236\u5b57\u8282\u6570\u7ec4\u7684\u65b9\u6cd5\uff1a<\/strong><\/p>\n<p>\u9664\u4e86 Arrays.copyOf() \u65b9\u6cd5\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u590d\u5236\u5b57\u8282\u6570\u7ec4\uff1a<\/p>\n<ul>\n<li> <strong>System.arraycopy()<\/strong>\uff1a\u8be5\u65b9\u6cd5\u5c06\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u7684\u90e8\u5206\u6216\u5168\u90e8\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u4e2d\u3002\u5b83\u9700\u8981\u56db\u4e2a\u53c2\u6570\uff1a\u6e90\u6570\u7ec4\u3001\u6e90\u6570\u7ec4\u7684\u8d77\u59cb\u504f\u79fb\u91cf\u3001\u76ee\u6807\u6570\u7ec4\u548c\u76ee\u6807\u6570\u7ec4\u7684\u8d77\u59cb\u504f\u79fb\u91cf\u3002<\/li>\n<li> <strong>clone()<\/strong>\uff1a\u5982\u679c\u5b57\u8282\u6570\u7ec4\u5b9e\u73b0\u4e86 Cloneable \u63a5\u53e3\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 clone() \u65b9\u6cd5\u521b\u5efa\u5176\u526f\u672c\u3002<\/li>\n<li> <strong>\u6784\u9020\u51fd\u6570<\/strong>\uff1a\u53ef\u4ee5\u4f7f\u7528 new byte[length] \u6784\u9020\u4e00\u4e2a\u65b0\u5b57\u8282\u6570\u7ec4\uff0c\u7136\u540e\u624b\u52a8\u586b\u5145\u5176\u5143\u7d20\u3002<\/li>\n<\/ul>\n<p><strong>\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u4ee5\u4e0b\u56e0\u7d20\uff1a<\/strong><\/p>\n<ul>\n<li>\u590d\u5236\u6570\u7ec4\u7684\u5927\u5c0f<\/li>\n<li>\u590d\u5236\u7684\u590d\u6742\u6027<\/li>\n<li>\u6027\u80fd\u8981\u6c42<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u590d\u5236\u5b57\u8282\u6570\u7ec4\u4e2d\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\u590d\u5236\u5b57\u8282\u6570\u7ec4\u53ef\u4f7f\u7528arrays.copyof()\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u539f\u6570\u7ec4\u548c\u65b0\u6570\u7ec4\u957f\u5ea6\u3002\u5176\u4ed6\u590d\u5236\u65b9\u6cd5\u5305\u62ecsystem.arraycopy()\u3001clone()\u548c\u6784\u9020\u51fd\u6570\uff0c\u9009\u62e9\u65b9\u6cd5\u65f6\u5e94\u8003\u8651\u590d\u5236\u5927\u5c0f\u3001\u590d\u6742\u6027\u548c\u6027\u80fd\u8981\u6c42\u3002 Java \u4e2d\u590d\u5236\u5b57\u8282\u6570\u7ec4 \u5982\u4f55\u590d\u5236\u5b57\u8282\u6570\u7ec4\uff1f \u53ef\u4ee5\u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5\u590d\u5236\u5b57\u8282\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u8981\u590d\u5236\u7684\u539f\u59cb\u6570\u7ec4\u548c\u590d\u5236\u540e\u7684\u65b0\u6570\u7ec4\u7684\u957f\u5ea6\u3002 \u793a\u4f8b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b byte[] originalArray = {1, 2, 3, 4, 5}; byte[] copyArray = Arrays.copyOf(originalArray, 3); \/\/ \u8f93\u51fa\u590d\u5236\u540e\u7684\u6570\u7ec4 System.out.println(Arrays.toString(copyArray)); \/\/ \u8f93\u51fa\uff1a[1, 2, 3] \u767b\u5f55\u540e\u590d\u5236 \u590d\u5236\u6570\u7ec4\u7684\u6ce8\u610f\u4e8b\u9879\uff1a \u590d\u5236\u540e\u7684\u6570\u7ec4\u5fc5\u987b\u5177\u6709\u5927\u4e8e\u6216\u7b49\u4e8e\u539f\u59cb\u6570\u7ec4\u957f\u5ea6\u7684\u957f\u5ea6\u3002 \u5982\u679c\u590d\u5236\u540e\u7684\u6570\u7ec4\u957f\u5ea6\u5c0f\u4e8e\u539f\u59cb\u6570\u7ec4\u957f\u5ea6\uff0c\u5219\u53ea\u590d\u5236\u5230\u590d\u5236\u540e\u7684\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a\u6b62\u3002 \u590d\u5236\u540e\u7684\u6570\u7ec4\u662f\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5b83\u4e0e\u539f\u59cb\u6570\u7ec4\u72ec\u7acb\u3002\u5bf9\u590d\u5236\u6570\u7ec4\u7684\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u6570\u7ec4\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002 \u5176\u4ed6\u590d\u5236\u5b57\u8282\u6570\u7ec4\u7684\u65b9\u6cd5\uff1a \u9664\u4e86 Arrays.copyOf() \u65b9\u6cd5\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u590d\u5236\u5b57\u8282\u6570\u7ec4\uff1a System.arraycopy()\uff1a\u8be5\u65b9\u6cd5\u5c06\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u7684\u90e8\u5206\u6216\u5168\u90e8\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u4e2d\u3002\u5b83\u9700\u8981\u56db\u4e2a\u53c2\u6570\uff1a\u6e90\u6570\u7ec4\u3001\u6e90\u6570\u7ec4\u7684\u8d77\u59cb\u504f\u79fb\u91cf\u3001\u76ee\u6807\u6570\u7ec4\u548c\u76ee\u6807\u6570\u7ec4\u7684\u8d77\u59cb\u504f\u79fb\u91cf\u3002 clone()\uff1a\u5982\u679c\u5b57\u8282\u6570\u7ec4\u5b9e\u73b0\u4e86 Cloneable \u63a5\u53e3\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 clone() \u65b9\u6cd5\u521b\u5efa\u5176\u526f\u672c\u3002 \u6784\u9020\u51fd\u6570\uff1a\u53ef\u4ee5\u4f7f\u7528 new byte[length] \u6784\u9020\u4e00\u4e2a\u65b0\u5b57\u8282\u6570\u7ec4\uff0c\u7136\u540e\u624b\u52a8\u586b\u5145\u5176\u5143\u7d20\u3002 \u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u4ee5\u4e0b\u56e0\u7d20\uff1a \u590d\u5236\u6570\u7ec4\u7684\u5927\u5c0f \u590d\u5236\u7684\u590d\u6742\u6027 \u6027\u80fd\u8981\u6c42 \u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u590d\u5236\u5b57\u8282\u6570\u7ec4\u4e2d\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-39220","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39220","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=39220"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39220\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}