{"id":66029,"date":"2025-05-03T11:15:21","date_gmt":"2025-05-03T03:15:21","guid":{"rendered":"https:\/\/fwq.ai\/blog\/66029\/"},"modified":"2025-05-03T11:15:21","modified_gmt":"2025-05-03T03:15:21","slug":"java%e6%80%8e%e4%b9%88%e5%9c%a8%e6%95%b0%e7%bb%84%e6%b7%bb%e5%8a%a0%e6%95%b0%e6%8d%ae-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/66029\/","title":{"rendered":"java\u600e\u4e48\u5728\u6570\u7ec4\u6dfb\u52a0\u6570\u636e"},"content":{"rendered":"

\n \u5728 java \u4e2d\u5411\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a\u901a\u8fc7\u83b7\u53d6\u6570\u7ec4\u957f\u5ea6\u5e76\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5c06\u539f\u6570\u7ec4\u5143\u7d20\u590d\u5236\u5e76\u6dfb\u52a0\u65b0\u5143\u7d20\u3002\u4f7f\u7528 arraylist\uff0c\u5b83\u53ef\u4ee5\u52a8\u6001\u8c03\u6574\u5927\u5c0f\u4ee5\u5bb9\u7eb3\u65b0\u5143\u7d20\uff0c\u53ea\u9700\u4f7f\u7528 add() \u65b9\u6cd5\u5373\u53ef\u3002\u4f7f\u7528 arrays.copyof() \u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u8fd4\u56de\u6307\u5b9a\u6570\u7ec4\u7684\u526f\u672c\u5e76\u6307\u5b9a\u65b0\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u7136\u540e\u6dfb\u52a0\u65b0\u5143\u7d20\u3002\n<\/p><\/blockquote>\n

\"java\u600e\u4e48\u5728\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5728 Java \u4e2d\u5411\u6570\u7ec4\u6dfb\u52a0\u6570\u636e<\/strong><\/p>\n

\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528\u6570\u7ec4\u7684 length \u5c5e\u6027<\/strong><\/p>\n

    \n
  1. \u83b7\u53d6\u6570\u7ec4\u7684\u5f53\u524d\u957f\u5ea6\u3002<\/li>\n
  2. \u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5143\u7d20\u6570\u91cf\u6bd4\u539f\u6570\u7ec4\u591a\u4e00\u4e2a\u3002<\/li>\n
  3. \u5c06\u539f\u6570\u7ec4\u5143\u7d20\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\u3002<\/li>\n
  4. \u5c06\u65b0\u5143\u7d20\u6dfb\u52a0\u5230\u65b0\u6570\u7ec4\u3002<\/li>\n<\/ol>\n

    \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n

    int[] numbers = {1, 2, 3};\nint newElement = 4;\n\nint[] newArray = new int[numbers.length + 1];\nSystem.arraycopy(numbers, 0, newArray, 0, numbers.length);\nnewArray[newArray.length - 1] = newElement;\n\n\/\/ \u6253\u5370\u65b0\u6570\u7ec4\nfor (int number : newArray) {\n    System.out.println(number);\n}<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u8f93\u51fa\uff1a<\/p>\n
    \u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
    1\n2\n3\n4<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528 ArrayList<\/strong><\/p>\n
    ArrayList \u662f\u4e00\u4e2a\u52a8\u6001\u6570\u7ec4\uff0c\u53ef\u4ee5\u81ea\u52a8\u8c03\u6574\u5927\u5c0f\u4ee5\u5bb9\u7eb3\u65b0\u5143\u7d20\u3002<\/p>\n
      \n
    1. \u521b\u5efa\u4e00\u4e2a ArrayList\u3002<\/li>\n
    2. \u4f7f\u7528 add() \u65b9\u6cd5\u6dfb\u52a0\u65b0\u5143\u7d20\u3002<\/li>\n<\/ol>\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
      ArrayList<String> names = new ArrayList<>();\nnames.add(\"John\");\nnames.add(\"Mary\");\n\n\/\/ \u6253\u5370 ArrayList\nfor (String name : names) {\n    System.out.println(name);\n}<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u8f93\u51fa\uff1a<\/p>\n
      \u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
      John\nMary<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5<\/strong><\/p>\n
      Arrays.copyOf() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u662f\u6307\u5b9a\u6570\u7ec4\u7684\u526f\u672c\uff0c\u5e76\u53ef\u6307\u5b9a\u65b0\u6570\u7ec4\u7684\u5927\u5c0f\u3002<\/p>\n
      \u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
      int[] numbers = {1, 2, 3};\nint newElement = 4;\n\nint[] newArray = Arrays.copyOf(numbers, numbers.length + 1);\nnewArray[newArray.length - 1] = newElement;\n\n\/\/ \u6253\u5370\u65b0\u6570\u7ec4\nfor (int number : newArray) {\n    System.out.println(number);\n}<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u8f93\u51fa\uff1a<\/p>\n
      \u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
      1\n2\n3\n4<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5728\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u5728 java \u4e2d\u5411\u6570\u7ec4\u6dfb\u52a0\u6570\u636e\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a\u901a\u8fc7\u83b7\u53d6\u6570\u7ec4\u957f\u5ea6\u5e76\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5c06\u539f\u6570\u7ec4\u5143\u7d20\u590d\u5236\u5e76\u6dfb\u52a0\u65b0\u5143\u7d20\u3002\u4f7f\u7528 arraylist\uff0c\u5b83\u53ef\u4ee5\u52a8\u6001\u8c03\u6574\u5927\u5c0f\u4ee5\u5bb9\u7eb3\u65b0\u5143\u7d20\uff0c\u53ea\u9700\u4f7f\u7528 add() \u65b9\u6cd5\u5373\u53ef\u3002\u4f7f\u7528 arrays.copyof() \u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u8fd4\u56de\u6307\u5b9a\u6570\u7ec4\u7684\u526f\u672c\u5e76\u6307\u5b9a\u65b0\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u7136\u540e\u6dfb\u52a0\u65b0\u5143\u7d20\u3002 \u5982\u4f55\u5728 Java \u4e2d\u5411\u6570\u7ec4\u6dfb\u52a0\u6570\u636e \u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528\u6570\u7ec4\u7684 length \u5c5e\u6027 \u83b7\u53d6\u6570\u7ec4\u7684\u5f53\u524d\u957f\u5ea6\u3002 \u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5143\u7d20\u6570\u91cf\u6bd4\u539f\u6570\u7ec4\u591a\u4e00\u4e2a\u3002 \u5c06\u539f\u6570\u7ec4\u5143\u7d20\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\u3002 \u5c06\u65b0\u5143\u7d20\u6dfb\u52a0\u5230\u65b0\u6570\u7ec4\u3002 \u793a\u4f8b\u4ee3\u7801\uff1a int[] numbers = {1, 2, 3}; int newElement = 4; int[] newArray = new int[numbers.length + 1]; System.arraycopy(numbers, 0, newArray, 0, numbers.length); newArray[newArray.length – 1] = newElement; \/\/ \u6253\u5370\u65b0\u6570\u7ec4 for (int number : newArray) { System.out.println(number); […]<\/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-66029","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66029","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=66029"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/66029\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=66029"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=66029"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=66029"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}