{"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\/zh_tw\/\u90e8\u843d\u683c\/java\/\u6578\u7d44\u8907\u88fd\u514b\u9686","title":{"rendered":"Java \u4e2d\u7684\u57fa\u672c\u6570\u7ec4\u64cd\u4f5c\u6458\u8981\u3002"},"content":{"rendered":"<h2>\u8072\u660e\u7684\u540c\u6642\u521d\u59cb\u5316\u6578\u7d44<\/h2>\n<p>\u60a8\u53ef\u4ee5\u5728\u5ba3\u544a\u7684\u540c\u6642\u521d\u59cb\u5316\u6578\u7d44\uff0c\u65b9\u6cd5\u662f\uff1a<\/p>\n<h4>\u7bc4\u4f8b\u7a0b\u5f0f\u78bc<\/h4>\n<pre class=\"sample_src\">\r\nstatic void arraySample() { String[] s = {&quot;\u860b\u679c&quot;, &quot;\u67f3\u6a59&quot;, &quot;\u9999\u8549&quot;}; } System.out.println(s[1]);\r\n<\/pre>\n<p>\u8f38\u51fa\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u6a58\u5b50\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>\u53d6\u5f97\u6578\u7d44\u4e2d\u7684\u5143\u7d20\u6578\u91cf \u2013 <strong>\u9577\u5ea6<\/strong><\/h2>\n<p>\u5982\u679c\u8981\u53d6\u5f97\u6578\u7d44\u4e2d\u5143\u7d20\u7684\u6578\u91cf\uff0c\u8acb\u4f7f\u7528 length\u3002\u8acb\u6ce8\u610f\uff0c\u9577\u5ea6\u662f\u4e00\u500b\u5b57\u6bb5\uff0c\u800c\u4e0d\u662f\u4e00\u500b\u65b9\u6cd5\u3002<\/p>\n<h4>\u7bc4\u4f8b\u7a0b\u5f0f\u78bc<\/h4>\n<pre class=\"sample_src\">\r\nstatic void lengthSample() { String[] s1 = {&quot;\u860b\u679c&quot;, &quot;\u67f3\u6a59&quot;, &quot;\u8461\u8404&quot;}; String[] s2 = {}; System.out.println(s1.length); System.out.println( s2.\u9577\u5ea6); }\r\n<\/pre>\n<p>\u8f38\u51fa\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n3\r\n0\r\n<\/pre>\n<h2>\u8907\u88fd\u6578\u7d44 \u2013 <strong>\u8907\u88fd<\/strong><\/h2>\n<p>\u7576\u60a8\u60f3\u8981\u5efa\u7acb\u8207\u53e6\u4e00\u500b\u9663\u5217\u76f8\u540c\u7684\u9663\u5217\u6642\uff0c\u514b\u9686\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h4>\u7bc4\u4f8b\u7a0b\u5f0f\u78bc<\/h4>\n<pre class=\"sample_src\">\r\nstatic void cloneSample() { String[] s1 = {&quot;\u860b\u679c&quot;, &quot;\u67f3\u6a59&quot;, &quot;\u8461\u8404&quot;}; String[] s2 = s1.clone(); System.out.println(s1[0] + &#039; &#039; + s1[1] + &#039; &#039; + s1[2]); System.out.println(s2[0] + &#039; &#039; + s2[1] + &#039; &#039; + s2[2]); }\r\n<\/pre>\n<p>\u8f38\u51fa\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u860b\u679c \u67f3\u6a59 \u8461\u8404 \u860b\u679c \u67f3\u6a59 \u8461\u8404\r\n<\/pre>\n<h2>\u8907\u88fd\u6578\u7d44 \u2013 <strong>\u7cfb\u7d71.arraycopy<\/strong><\/h2>\n<p>Java \u9663\u5217\u5728\u521d\u59cb\u5316\u6642\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\u3002\u5982\u679c\u8981\u5728\u5efa\u7acb\u5f8c\u589e\u52a0\u9663\u5217\u7684\u5927\u5c0f\uff0c\u5247\u9700\u8981\u4f7f\u7528 System.arraycopy\u3002<\/p>\n<p>arraycopy \u8207clone \u985e\u4f3c\uff0c\u7528\u65bc\u8907\u88fd\u6578\u7d44\uff0c\u4f46\u5b83\u6bd4clone \u5141\u8a31\u66f4\u8a73\u7d30\u7684\u8a2d\u5b9a\u3002<\/p>\n<pre class=\"point\">\r\narraycopy(Object src, int srcPos, Object dest, int destPos, int length) src...\u8907\u88fd\u4f86\u6e90\u6578\u7d44srcPos...\u8907\u88fd\u4f86\u6e90\u6578\u7d44(src) \u8d77\u59cb\u4f4d\u7f6e\u8907\u88fddest...\u8907\u88fd\u76ee\u6a19\u6578\u7d44destPos. .. Start\u8907\u88fd\u76ee\u6a19\u9663\u5217 (dest) \u4e2d\u8981\u8907\u88fd\u7684\u4f4d\u7f6e length...\u8981\u8907\u88fd\u7684\u5143\u7d20\u6578\u91cf\r\n<\/pre>\n<h4>\u7bc4\u4f8b\u7a0b\u5f0f\u78bc<\/h4>\n<pre class=\"sample_src\">\r\nstatic void arraycopySample() { String[] s1 = {&quot;\u860b\u679c&quot;, &quot;\u67f3\u6a59&quot;, &quot;\u8461\u8404&quot;}; String[] s2 = new String[5]; System.arraycopy(s1, 0, s2, 0, 3) ; s2[3] = &quot;\u9999\u8549&quot;; s2[4] = &quot;\u6afb\u6843&quot;; System.out.println(s1[0] + &quot; &quot; + s1[1] + &quot; &quot; + s1[2]); System.out .println(s2[0] + &quot; &quot; + s2[1] + &quot; &quot; + s2[2] + &quot; &quot; + s2[3] + &quot; &quot; + s2[4]); }\r\n<\/pre>\n<p>\u8f38\u51fa\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u860b\u679c\u3001\u67f3\u6a59\u3001\u8461\u8404\u3001\u860b\u679c\u3001\u67f3\u6a59\u3001\u8461\u8404\u3001\u9999\u8549\u3001\u6afb\u6843\r\n<\/pre>\n<p>\u9023\u63a5\u9663\u5217\u6642\u4f7f\u7528 arraycopy \u4e5f\u5f88\u65b9\u4fbf\u3002<\/p>\n<h4>\u7bc4\u4f8b\u7a0b\u5f0f\u78bc<\/h4>\n<pre class=\"sample_src\">\r\nstatic void joinArraySample() { String[] s1 = {&quot;\u860b\u679c&quot;, &quot;\u6a58\u5b50&quot;, &quot;\u8461\u8404&quot;}; String[] s2 = {&quot;\u9999\u8549&quot;, &quot;\u6afb\u6843&quot;, &quot;\u6843\u5b50&quot;}; int rLen = s1.length + s2.length; String[] rStr = new String[rLen]; \/\/\u521d\u59cb\u5316\u6578\u7d44\uff0c\u9577\u5ea6\u70bas1\u548cs2\u7684\u9577\u5ea6System.arraycopy(s1, 0, rStr, 0, s1.length); System .arraycopy( s2 , 0, rStr, s1.length, s2.length); \/\/\u91cd\u9ede\u5728\u65bc\u8a2d\u5b9a\u8907\u88fd\u76ee\u6a19\u6578\u7d44\u7684\u8d77\u59cb\u4f4d\u7f6eSystem.out.println(rStr[0] + &quot; &quot; + rStr[1] + &quot; &quot; + rStr[ 2] + &quot; &quot; + rStr[3] + &quot; &quot; + rStr[4] + &quot; &quot; + rStr[5]); }\r\n<\/pre>\n<p>\u8f38\u51fa\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n\u860b\u679c\u3001\u6a58\u5b50\u3001\u8461\u8404\u3001\u9999\u8549\u3001\u6afb\u6843\u3001\u6843\u5b50\r\n<\/pre>\n<h2>\u5efa\u7acb\u591a\u7dad\u6578\u7d44<\/h2>\n<p>\u60a8\u53ef\u4ee5\u900f\u904e\u5728\u6578\u7d44\u4e2d\u5efa\u7acb\u6578\u7d44\u4f86\u5efa\u7acb\u591a\u7dad\u6578\u7d44\u3002\u9019\u5728\u5132\u5b58\u8868\u683c\u8cc7\u6599\u6642\u5f88\u6709\u7528\u3002<\/p>\n<h4>\u7bc4\u4f8b\u7a0b\u5f0f\u78bc<\/h4>\n<pre class=\"sample_src\">\r\n\u975c\u614b\u7121\u6548 TwoDArraySample() { int[] a1 = {38, 84, 98}; int[] a2 = {32, 11, 56}; int[] a3 = {82, 77, 8}; int[][] TwoDArray = {a1, a2, a3}; for (int[] a : TwoDArray) { for (int Score : a) { System.out.print(score + &quot; &quot;); } System.out.println(&quot;&quot;) ; } }\r\n<\/pre>\n<p>\u8f38\u51fa\u7d50\u679c\uff1a<\/p>\n<pre class=\"console\">\r\n38 84 98 \r\n32 11 56 \r\n82 77 8 \r\n<\/pre>","protected":false},"excerpt":{"rendered":"<p>\u5728\u5ba3\u544a\u7684\u540c\u6642\u521d\u59cb\u5316\u9663\u5217 \u60a8\u53ef\u4ee5\u5728\u5ba3\u544a\u7684\u540c\u6642\u521d\u59cb\u5316\u6578\u7d44\uff0c\u5982\u4e0b\u6240\u793a\u3002\u7bc4\u4f8b\u7a0b\u5f0f\u78bc sta [...]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":""},"categories":[19],"tags":[],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/4681"}],"collection":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/comments?post=4681"}],"version-history":[{"count":6,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/4681\/revisions"}],"predecessor-version":[{"id":4688,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/4681\/revisions\/4688"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/media?parent=4681"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/categories?post=4681"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/tags?post=4681"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}