{"id":38986,"date":"2024-11-26T15:44:39","date_gmt":"2024-11-26T07:44:39","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38986\/"},"modified":"2024-11-26T15:44:39","modified_gmt":"2024-11-26T07:44:39","slug":"java-%e6%80%8e%e4%b9%88%e6%94%b9%e5%8f%98%e6%95%b0%e7%bb%84%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38986\/","title":{"rendered":"java \u600e\u4e48\u6539\u53d8\u6570\u7ec4\u957f\u5ea6"},"content":{"rendered":"

\n java \u4e2d\u6570\u7ec4\u957f\u5ea6\u65e0\u6cd5\u76f4\u63a5\u66f4\u6539\u3002\u53ef\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u5b9e\u73b0\u66f4\u6539\u957f\u5ea6\u7684\u6548\u679c\uff1a\u4f7f\u7528 list\uff1a\u501f\u52a9 arraylist \u7684\u52a8\u6001\u5927\u5c0f\u7279\u6027\uff0c\u53ef\u5c06\u6570\u7ec4\u5143\u7d20\u8f6c\u6362\u4e3a list \u4ee5\u7075\u6d3b\u6dfb\u52a0\u548c\u5220\u9664\u5143\u7d20\u3002\u590d\u5236\u6570\u7ec4\uff1a\u901a\u8fc7\u521b\u5efa\u65b0\u6570\u7ec4\u5e76\u5c06\u73b0\u6709\u5143\u7d20\u590d\u5236\u8fc7\u53bb\uff0c\u53ef\u4ee5\u83b7\u5f97\u6240\u9700\u957f\u5ea6\u7684\u65b0\u6570\u7ec4\u3002\u4f7f\u7528 guava library\uff1aarrays.copyof() \u65b9\u6cd5\u53ef\u521b\u5efa\u5177\u6709\u6307\u5b9a\u957f\u5ea6\u7684\u65b0\u6570\u7ec4\uff0c\u5e76\u590d\u5236\u73b0\u6709\u5143\u7d20\u3002\n<\/p><\/blockquote>\n

\"java<\/p>\n

Java \u4e2d\u66f4\u6539\u6570\u7ec4\u957f\u5ea6<\/strong><\/p>\n

Java \u4e2d\u7684\u6570\u7ec4\u662f\u56fa\u5b9a\u5927\u5c0f\u7684\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u521b\u5efa\uff0c\u5176\u957f\u5ea6\u5c31\u65e0\u6cd5\u66f4\u6539\u3002\u4f46\u662f\uff0c\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u66f4\u6539\u6570\u7ec4\u957f\u5ea6\u7684\u6548\u679c\uff1a<\/p>\n

1. \u4f7f\u7528 List<\/strong><\/p>\n

List \u662f\u4e00\u4e2a\u52a8\u6001\u5927\u5c0f\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u5b58\u50a8\u4efb\u4f55\u7c7b\u578b\u5bf9\u8c61\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 ArrayList \u5b9e\u73b0\uff0c\u5b83\u53ef\u4ee5\u6839\u636e\u9700\u8981\u81ea\u52a8\u8c03\u6574\u5927\u5c0f\u3002\u8981\u5c06\u6570\u7ec4\u5143\u7d20\u8f6c\u6362\u4e3a ArrayList\uff0c\u53ef\u4ee5\u4f7f\u7528 Arrays.asList() \u65b9\u6cd5\uff1a<\/p>\n

\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n

int[] arr = {1, 2, 3};\nList<Integer> list = new ArrayList<>(Arrays.asList(arr));<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
2. \u590d\u5236\u6570\u7ec4<\/strong><\/p>\n
\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5176\u957f\u5ea6\u4e0e\u6240\u9700\u7684\u957f\u5ea6\u76f8\u540c\uff0c\u7136\u540e\u5c06\u73b0\u6709\u5143\u7d20\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\u3002\u4ee5\u4e0b\u4ee3\u7801\u5b9e\u73b0\u6b64\u64cd\u4f5c\uff1a<\/p>\n
int[] oldArr = {1, 2, 3};\nint newArr[] = new int[5];\n\nSystem.arraycopy(oldArr, 0, newArr, 0, oldArr.length);\n\n\/\/ \u6dfb\u52a0\u65b0\u5143\u7d20\nnewArr[3] = 4;\nnewArr[4] = 5;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
3. \u4f7f\u7528 Guava Library<\/strong><\/p>\n
Guava \u5e93\u63d0\u4f9b\u4e86\u4e00\u4e2a Arrays.copyOf() \u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u521b\u5efa\u5177\u6709\u6307\u5b9a\u957f\u5ea6\u7684\u65b0\u6570\u7ec4\uff0c\u5e76\u590d\u5236\u73b0\u6709\u5143\u7d20\u3002<\/p>\n
int[] newArr = Arrays.copyOf(oldArr, 5);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/strong><\/p>\n
    \n
  • \u4f7f\u7528 List \u53ef\u4ee5\u7075\u6d3b\u5730\u6dfb\u52a0\u548c\u5220\u9664\u5143\u7d20\uff0c\u4f46\u901f\u5ea6\u53ef\u80fd\u6bd4\u4f7f\u7528\u6570\u7ec4\u6162\u3002<\/li>\n
  • \u590d\u5236\u6570\u7ec4\u4f1a\u521b\u5efa\u65b0\u5185\u5b58\u5e76\u590d\u5236\u5143\u7d20\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n
  • Guava \u5e93\u662f\u4e00\u4e2a\u7b2c\u4e09\u65b9\u5e93\uff0c\u9700\u8981\u6dfb\u52a0\u5230\u9879\u76ee\u4e2d\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u5c31\u662fjava \u600e\u4e48\u6539\u53d8\u6570\u7ec4\u957f\u5ea6\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":"
    java \u4e2d\u6570\u7ec4\u957f\u5ea6\u65e0\u6cd5\u76f4\u63a5\u66f4\u6539\u3002\u53ef\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\u5b9e\u73b0\u66f4\u6539\u957f\u5ea6\u7684\u6548\u679c\uff1a\u4f7f\u7528 list\uff1a\u501f\u52a9 arraylist \u7684\u52a8\u6001\u5927\u5c0f\u7279\u6027\uff0c\u53ef\u5c06\u6570\u7ec4\u5143\u7d20\u8f6c\u6362\u4e3a list \u4ee5\u7075\u6d3b\u6dfb\u52a0\u548c\u5220\u9664\u5143\u7d20\u3002\u590d\u5236\u6570\u7ec4\uff1a\u901a\u8fc7\u521b\u5efa\u65b0\u6570\u7ec4\u5e76\u5c06\u73b0\u6709\u5143\u7d20\u590d\u5236\u8fc7\u53bb\uff0c\u53ef\u4ee5\u83b7\u5f97\u6240\u9700\u957f\u5ea6\u7684\u65b0\u6570\u7ec4\u3002\u4f7f\u7528 guava library\uff1aarrays.copyof() \u65b9\u6cd5\u53ef\u521b\u5efa\u5177\u6709\u6307\u5b9a\u957f\u5ea6\u7684\u65b0\u6570\u7ec4\uff0c\u5e76\u590d\u5236\u73b0\u6709\u5143\u7d20\u3002 Java \u4e2d\u66f4\u6539\u6570\u7ec4\u957f\u5ea6 Java \u4e2d\u7684\u6570\u7ec4\u662f\u56fa\u5b9a\u5927\u5c0f\u7684\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u521b\u5efa\uff0c\u5176\u957f\u5ea6\u5c31\u65e0\u6cd5\u66f4\u6539\u3002\u4f46\u662f\uff0c\u6709\u51e0\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u66f4\u6539\u6570\u7ec4\u957f\u5ea6\u7684\u6548\u679c\uff1a 1. \u4f7f\u7528 List List \u662f\u4e00\u4e2a\u52a8\u6001\u5927\u5c0f\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u5b58\u50a8\u4efb\u4f55\u7c7b\u578b\u5bf9\u8c61\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 ArrayList \u5b9e\u73b0\uff0c\u5b83\u53ef\u4ee5\u6839\u636e\u9700\u8981\u81ea\u52a8\u8c03\u6574\u5927\u5c0f\u3002\u8981\u5c06\u6570\u7ec4\u5143\u7d20\u8f6c\u6362\u4e3a ArrayList\uff0c\u53ef\u4ee5\u4f7f\u7528 Arrays.asList() \u65b9\u6cd5\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b int[] arr = {1, 2, 3}; List<Integer> list = new ArrayList<>(Arrays.asList(arr)); \u767b\u5f55\u540e\u590d\u5236 2. \u590d\u5236\u6570\u7ec4 \u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5176\u957f\u5ea6\u4e0e\u6240\u9700\u7684\u957f\u5ea6\u76f8\u540c\uff0c\u7136\u540e\u5c06\u73b0\u6709\u5143\u7d20\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\u3002\u4ee5\u4e0b\u4ee3\u7801\u5b9e\u73b0\u6b64\u64cd\u4f5c\uff1a int[] oldArr = {1, 2, 3}; int newArr[] = new int[5]; System.arraycopy(oldArr, 0, newArr, 0, […]<\/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-38986","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38986","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=38986"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38986\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=38986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=38986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=38986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}