{"id":38233,"date":"2024-11-26T10:08:33","date_gmt":"2024-11-26T02:08:33","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38233\/"},"modified":"2024-11-26T10:08:33","modified_gmt":"2024-11-26T02:08:33","slug":"java-%e6%80%8e%e4%b9%88%e5%83%8f%e6%95%b0%e7%bb%84%e6%b7%bb%e5%8a%a0%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38233\/","title":{"rendered":"java \u600e\u4e48\u50cf\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20"},"content":{"rendered":"

\n java \u4e2d\u5411\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u4ee5\u4e0b 4 \u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 arrays.copyof() \u65b9\u6cd5\u521b\u5efa\u5305\u542b\u73b0\u6709\u5143\u7d20\u548c\u65b0\u5143\u7d20\u7684\u65b0\u6570\u7ec4\u3002\u4f7f\u7528 arraylist \u7684 add() \u65b9\u6cd5\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u53ef\u53d8\u5927\u5c0f\u7684\u5217\u8868\u4e2d\u3002\u4f7f\u7528 guava \u7684 lists.newarraylist() \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u6570\u7ec4\u5143\u7d20\u548c\u65b0\u5143\u7d20\u7684\u65b0\u5217\u8868\u3002\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\uff08\u5982 apache commons lang3 \u6216 eclipse collections\uff09\u6765\u8f7b\u677e\u5b9e\u73b0\u6b64\u64cd\u4f5c\u3002\n<\/p><\/blockquote>\n

\"java<\/p>\n

\u5982\u4f55\u5728 Java \u4e2d\u5411\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20<\/strong><\/p>\n

\u6570\u7ec4\u662f\u4e00\u79cd\u5728 Java \u4e2d\u5b58\u50a8\u76f8\u540c\u7c7b\u578b\u6570\u636e\u7684\u96c6\u5408\u3002\u5b83\u4eec\u5927\u5c0f\u56fa\u5b9a\uff0c\u56e0\u6b64\u5728\u521b\u5efa\u6570\u7ec4\u65f6\u5fc5\u987b\u6307\u5b9a\u5927\u5c0f\u3002\u4f46\u662f\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u5411\u73b0\u6709\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\uff1a<\/p>\n

1. \u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5<\/strong><\/p>\n

\u6b64\u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5b83\u5305\u542b\u73b0\u6709\u6570\u7ec4\u548c\u4e00\u4e2a\u6216\u591a\u4e2a\u65b0\u5143\u7d20\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

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

int[] newArray = Arrays.copyOf(oldArray, oldArray.length + newElements.length);\nSystem.arraycopy(newElements, 0, newArray, oldArray.length, newElements.length);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  • oldArray\uff1a\u8981\u5411\u5176\u6dfb\u52a0\u5143\u7d20\u7684\u73b0\u6709\u6570\u7ec4<\/li>\n
  • newElements\uff1a\u8981\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u65b0\u5143\u7d20<\/li>\n
  • newArray\uff1a\u5305\u542b\u73b0\u6709\u6570\u7ec4\u548c\u65b0\u5143\u7d20\u7684\u65b0\u6570\u7ec4<\/li>\n<\/ul>\n
    2. \u4f7f\u7528 ArrayList<\/strong><\/p>\n
    ArrayList \u662f\u4e00\u4e2a\u53ef\u53d8\u5927\u5c0f\u7684\u6570\u7ec4\uff0c\u5141\u8bb8\u6dfb\u52a0\u548c\u5220\u9664\u5143\u7d20\u3002\u8981\u5c06\u5143\u7d20\u6dfb\u52a0\u5230 ArrayList\uff0c\u53ef\u4ee5\u4f7f\u7528 add() \u65b9\u6cd5\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
    ArrayList<Integer> list = new ArrayList<>();\nlist.add(10);<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    3. \u4f7f\u7528 Guava \u5e93<\/strong><\/p>\n
    Guava \u5e93\u63d0\u4f9b\u4e86 Lists.newArrayList() \u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 ArrayList\uff0c\u5176\u4e2d\u5305\u542b\u73b0\u6709\u6570\u7ec4\u7684\u5143\u7d20\u4ee5\u53ca\u65b0\u5143\u7d20\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
    List<Integer> newList = Lists.newArrayList(oldArray);\nnewList.add(10);<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    4. \u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93<\/strong><\/p>\n
    \u03c5\u03c0\u03ac\u03c1\u03c7\uc2b5\ub2c8\ub2e4 \u63d0\u4f9b\u4f7f\u7528 Java 8 \u6d41\u8f7b\u677e\u5411\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u7684\u7b2c\u4e09\u65b9\u5e93\u3002\u5176\u4e2d\u4e24\u4e2a\u6d41\u884c\u7684\u5e93\u662f\uff1a<\/p>\n
      \n
    •  Apache Commons Lang3<\/strong>\uff1a\u4f7f\u7528 ArrayUtils.add() \u65b9\u6cd5<\/li>\n
    •  Eclipse Collections<\/strong>\uff1a\u4f7f\u7528 FastList.newFastList() \u65b9\u6cd5<\/li>\n<\/ul>\n
      \u4ee5\u4e0a\u5c31\u662fjava \u600e\u4e48\u50cf\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\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\u5411\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u4ee5\u4e0b 4 \u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528 arrays.copyof() \u65b9\u6cd5\u521b\u5efa\u5305\u542b\u73b0\u6709\u5143\u7d20\u548c\u65b0\u5143\u7d20\u7684\u65b0\u6570\u7ec4\u3002\u4f7f\u7528 arraylist \u7684 add() \u65b9\u6cd5\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u53ef\u53d8\u5927\u5c0f\u7684\u5217\u8868\u4e2d\u3002\u4f7f\u7528 guava \u7684 lists.newarraylist() \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u6570\u7ec4\u5143\u7d20\u548c\u65b0\u5143\u7d20\u7684\u65b0\u5217\u8868\u3002\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\uff08\u5982 apache commons lang3 \u6216 eclipse collections\uff09\u6765\u8f7b\u677e\u5b9e\u73b0\u6b64\u64cd\u4f5c\u3002 \u5982\u4f55\u5728 Java \u4e2d\u5411\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20 \u6570\u7ec4\u662f\u4e00\u79cd\u5728 Java \u4e2d\u5b58\u50a8\u76f8\u540c\u7c7b\u578b\u6570\u636e\u7684\u96c6\u5408\u3002\u5b83\u4eec\u5927\u5c0f\u56fa\u5b9a\uff0c\u56e0\u6b64\u5728\u521b\u5efa\u6570\u7ec4\u65f6\u5fc5\u987b\u6307\u5b9a\u5927\u5c0f\u3002\u4f46\u662f\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u5411\u73b0\u6709\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\uff1a 1. \u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5 \u6b64\u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5b83\u5305\u542b\u73b0\u6709\u6570\u7ec4\u548c\u4e00\u4e2a\u6216\u591a\u4e2a\u65b0\u5143\u7d20\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b int[] newArray = Arrays.copyOf(oldArray, oldArray.length + newElements.length); System.arraycopy(newElements, 0, newArray, oldArray.length, newElements.length); \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a oldArray\uff1a\u8981\u5411\u5176\u6dfb\u52a0\u5143\u7d20\u7684\u73b0\u6709\u6570\u7ec4 newElements\uff1a\u8981\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u65b0\u5143\u7d20 newArray\uff1a\u5305\u542b\u73b0\u6709\u6570\u7ec4\u548c\u65b0\u5143\u7d20\u7684\u65b0\u6570\u7ec4 2. \u4f7f\u7528 ArrayList ArrayList \u662f\u4e00\u4e2a\u53ef\u53d8\u5927\u5c0f\u7684\u6570\u7ec4\uff0c\u5141\u8bb8\u6dfb\u52a0\u548c\u5220\u9664\u5143\u7d20\u3002\u8981\u5c06\u5143\u7d20\u6dfb\u52a0\u5230 ArrayList\uff0c\u53ef\u4ee5\u4f7f\u7528 […]<\/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-38233","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38233","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=38233"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/38233\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=38233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=38233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=38233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}