{"id":4681,"date":"2019-10-30T19:27:32","date_gmt":"2019-10-30T10:27:32","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=4681"},"modified":"2019-10-30T19:38:47","modified_gmt":"2019-10-30T10:38:47","slug":"array_copy_clone","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/th\/blog\/java\/array_copy_clone","title":{"rendered":"\u0e2a\u0e23\u0e38\u0e1b\u0e01\u0e32\u0e23\u0e14\u0e33\u0e40\u0e19\u0e34\u0e19\u0e01\u0e32\u0e23\u0e2d\u0e32\u0e23\u0e4c\u0e40\u0e23\u0e22\u0e4c\u0e02\u0e31\u0e49\u0e19\u0e1e\u0e37\u0e49\u0e19\u0e10\u0e32\u0e19\u0e43\u0e19 Java"},"content":{"rendered":"<h2>\u5ba3\u8a00\u3068\u540c\u6642\u306b\u914d\u5217\u3092\u521d\u671f\u5316<\/h2>\n<p>\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u5ba3\u8a00\u3068\u540c\u6642\u306b\u914d\u5217\u3092\u521d\u671f\u5316\u3067\u304d\u307e\u3059\u3002<\/p>\n<h4>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/h4>\n<pre class=\"sample_src\">\r\nstatic void arraySample() {\r\n    String[] s = {\"\u308a\u3093\u3054\", \"\u307f\u304b\u3093\", \"\u3070\u306a\u306a\"};\r\n}\r\nSystem.out.println(s[1]);\r\n<\/pre>\n<p>\u51fa\u529b\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u307f\u304b\u3093\r\n<\/pre>\n<p><script type=\"text\/javascript\" src=\"https:\/\/chat-messenger.com\/js\/common.js?dd12sssas2223\" charset=\"UTF-8\"><\/script><br \/>\n<script type=\"text\/javascript\"> writePR(); <\/script><\/p>\n<h2>\u914d\u5217\u306e\u8981\u7d20\u6570\u3092\u53d6\u5f97\u3059\u308b &#8211; <strong>length<\/strong><\/h2>\n<p>\u914d\u5217\u306b\u3044\u304f\u3064\u8981\u7d20\u304c\u5165\u3063\u3066\u3044\u308b\u304b\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306f length \u3092\u4f7f\u3044\u307e\u3059\u3002length \u306f\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u306a\u304f\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3042\u308b\u70b9\u306b\u82e5\u5e72\u306e\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h4>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/h4>\n<pre class=\"sample_src\">\r\nstatic void lengthSample() {\r\n    String[] s1 = {\"\u308a\u3093\u3054\", \"\u307f\u304b\u3093\", \"\u3076\u3069\u3046\"};\r\n    String[] s2 = {};\r\n    System.out.println(s1.length);\r\n    System.out.println(s2.length);\r\n}\r\n<\/pre>\n<p>\u51fa\u529b\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n3\r\n0\r\n<\/pre>\n<h2>\u914d\u5217\u3092\u30b3\u30d4\u30fc\u3059\u308b &#8211; <strong>clone<\/strong><\/h2>\n<p>\u3042\u308b\u914d\u5217\u3068\u540c\u3058\u914d\u5217\u3092\u4f5c\u308a\u305f\u3044\u5834\u5408\u306f\u3001clone \u304c\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<h4>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/h4>\n<pre class=\"sample_src\">\r\nstatic void cloneSample() {\r\n    String[] s1 = {\"\u308a\u3093\u3054\", \"\u307f\u304b\u3093\", \"\u3076\u3069\u3046\"};\r\n    String[] s2 = s1.clone();\r\n    System.out.println(s1[0] + ' ' + s1[1] + ' ' + s1[2]);\r\n    System.out.println(s2[0] + ' ' + s2[1] + ' ' + s2[2]);\r\n}\r\n<\/pre>\n<p>\u51fa\u529b\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u308a\u3093\u3054 \u307f\u304b\u3093 \u3076\u3069\u3046\r\n\u308a\u3093\u3054 \u307f\u304b\u3093 \u3076\u3069\u3046\r\n<\/pre>\n<h2>\u914d\u5217\u3092\u30b3\u30d4\u30fc\u3059\u308b &#8211; <strong>System.arraycopy<\/strong><\/h2>\n<p>Java \u306e\u914d\u5217\u306f\u3001\u521d\u671f\u5316\u6642\u306e\u30b5\u30a4\u30ba\u3067\u56fa\u5b9a\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u4e00\u5ea6\u4f5c\u3063\u305f\u914d\u5217\u306e\u30b5\u30a4\u30ba\u3092\u5927\u304d\u304f\u3057\u305f\u3044\u5834\u5408\u306f System.arraycopy \u3092\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>arraycopy \u306f clone \u3068\u540c\u3058\u304f\u914d\u5217\u3092\u30b3\u30d4\u30fc\u3059\u308b\u969b\u306b\u4f7f\u7528\u3057\u307e\u3059\u304c\u3001clone \u3088\u308a\u3082\u7d30\u304b\u306a\u8a2d\u5b9a\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"point\">\r\narraycopy(Object src, int srcPos, Object dest, int destPos, int length)\r\n src...\u30b3\u30d4\u30fc\u5143\u306e\u914d\u5217\r\n srcPos...\u30b3\u30d4\u30fc\u5143\u914d\u5217(src)\u306e\u30b3\u30d4\u30fc\u3059\u308b\u958b\u59cb\u4f4d\u7f6e\r\n dest...\u30b3\u30d4\u30fc\u5148\u306e\u914d\u5217\r\n destPos...\u30b3\u30d4\u30fc\u5148\u914d\u5217(dest)\u306e\u30b3\u30d4\u30fc\u3059\u308b\u958b\u59cb\u4f4d\u7f6e\r\n length...\u30b3\u30d4\u30fc\u3059\u308b\u8981\u7d20\u306e\u6570\r\n<\/pre>\n<h4>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/h4>\n<pre class=\"sample_src\">\r\nstatic void arraycopySample() {\r\n    String[] s1 = {\"\u308a\u3093\u3054\", \"\u307f\u304b\u3093\", \"\u3076\u3069\u3046\"};\r\n    String[] s2 = new String[5];\r\n    System.arraycopy(s1, 0, s2, 0, 3);\r\n    s2[3] = \"\u3070\u306a\u306a\";\r\n    s2[4] = \"\u3055\u304f\u3089\u3093\u307c\";\r\n    System.out.println(s1[0] + \" \" + s1[1] + \" \" + s1[2]);\r\n    System.out.println(s2[0] + \" \" + s2[1] + \" \" + s2[2] + \" \" + s2[3] + \" \" + s2[4]);\r\n}\r\n<\/pre>\n<p>\u51fa\u529b\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u308a\u3093\u3054 \u307f\u304b\u3093 \u3076\u3069\u3046\r\n\u308a\u3093\u3054 \u307f\u304b\u3093 \u3076\u3069\u3046 \u3070\u306a\u306a \u3055\u304f\u3089\u3093\u307c\r\n<\/pre>\n<p>\u914d\u5217\u306e\u7d50\u5408\u3092\u3059\u308b\u5834\u5408\u3082 arraycopy \u3092\u4f7f\u3046\u3068\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<h4>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/h4>\n<pre class=\"sample_src\">\r\nstatic void joinArraySample() {\r\n    String[] s1 = {\"\u308a\u3093\u3054\", \"\u307f\u304b\u3093\", \"\u3076\u3069\u3046\"};\r\n    String[] s2 = {\"\u3070\u306a\u306a\", \"\u3055\u304f\u3089\u3093\u307c\", \"\u3082\u3082\"};\r\n    int rLen = s1.length + s2.length;\r\n    String[] rStr = new String[rLen]; \/\/s1\u3068s2\u4e21\u65b9\u306e\u9577\u3055\u5206\u306e\u914d\u5217\u3092\u521d\u671f\u5316\r\n    System.arraycopy(s1, 0, rStr, 0, s1.length);\r\n    System.arraycopy(s2, 0, rStr, s1.length, s2.length); \/\/\u30b3\u30d4\u30fc\u5148\u914d\u5217\u306e\u958b\u59cb\u4f4d\u7f6e\u306e\u8a2d\u5b9a\u304c\u30dd\u30a4\u30f3\u30c8\r\n    System.out.println(rStr[0] + \" \" + rStr[1] + \" \" + rStr[2] + \" \" + rStr[3] + \" \" + rStr[4] + \" \" + rStr[5]);\r\n}\r\n<\/pre>\n<p>\u51fa\u529b\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u308a\u3093\u3054 \u307f\u304b\u3093 \u3076\u3069\u3046 \u3070\u306a\u306a \u3055\u304f\u3089\u3093\u307c \u3082\u3082\r\n<\/pre>\n<h2>\u591a\u6b21\u5143\u914d\u5217\u3092\u4f5c\u308b<\/h2>\n<p>\u914d\u5217\u306e\u4e2d\u306b\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001\u591a\u6b21\u5143\u914d\u5217\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u8868\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u5834\u5408\u306a\u3069\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h4>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/h4>\n<pre class=\"sample_src\">\r\nstatic void twoDArraySample() {\r\n    int[] a1 = {38, 84, 98};\r\n    int[] a2 = {32, 11, 56};\r\n    int[] a3 = {82, 77, 8};\r\n    int[][] twoDArray = {a1, a2, a3};\r\n    for (int[] a : twoDArray) {\r\n        for (int score : a) {\r\n            System.out.print(score + \" \");\r\n        }\r\n        System.out.println(\"\");\r\n    }\r\n}\r\n<\/pre>\n<p>\u51fa\u529b\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n38 84 98 \r\n32 11 56 \r\n82 77 8 \r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5ba3\u8a00\u3068\u540c\u6642\u306b\u914d\u5217\u3092\u521d\u671f\u5316 \u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u5ba3\u8a00\u3068\u540c\u6642\u306b\u914d\u5217\u3092\u521d\u671f\u5316\u3067\u304d\u307e\u3059\u3002 \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9 sta [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[19],"tags":[],"class_list":["post-4681","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/posts\/4681","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/comments?post=4681"}],"version-history":[{"count":6,"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/posts\/4681\/revisions"}],"predecessor-version":[{"id":4688,"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/posts\/4681\/revisions\/4688"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/media?parent=4681"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/categories?post=4681"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/th\/wp-json\/wp\/v2\/tags?post=4681"}],"curies":[{"name":"\u0e14\u0e31\u0e1a\u0e40\u0e1a\u0e34\u0e25\u0e22\u0e39\u0e1e\u0e35","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}