{"id":35398,"date":"2024-11-26T10:38:40","date_gmt":"2024-11-26T02:38:40","guid":{"rendered":"https:\/\/fwq.ai\/blog\/35398\/"},"modified":"2024-11-26T10:38:40","modified_gmt":"2024-11-26T02:38:40","slug":"java%e4%b8%ad%e6%80%8e%e4%b9%88%e5%9c%a8%e6%95%b0%e7%bb%84%e4%b8%ad%e6%b7%bb%e5%8a%a0%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/35398\/","title":{"rendered":"Java\u4e2d\u600e\u4e48\u5728\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20"},"content":{"rendered":"

\n \u5411 java \u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u56db\u79cd\u65b9\u6cd5\uff1a\u521d\u59cb\u5316\u6570\u7ec4\u65f6\u6307\u5b9a\u5143\u7d20\u3002\u4f7f\u7528\u6570\u7ec4\u5143\u7d20\u5f15\u7528\u76f4\u63a5\u8d4b\u503c\u3002\u4f7f\u7528 arrays.copyof() \u65b9\u6cd5\u521b\u5efa\u65b0\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u3002\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\uff08\u5982 guava\uff09\u521b\u5efa\u5217\u8868\u5e76\u6dfb\u52a0\u5143\u7d20\u3002\n<\/p><\/blockquote>\n

\"Java\u4e2d\u600e\u4e48\u5728\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20\u63d2\u56fe\"<\/p>\n

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

Java \u6570\u7ec4\u662f\u56fa\u5b9a\u957f\u5ea6\u7684\u5143\u7d20\u6709\u5e8f\u96c6\u5408\u3002\u4e00\u65e6\u521b\u5efa\uff0c\u6570\u7ec4\u7684\u5927\u5c0f\u5c31\u4e0d\u80fd\u66f4\u6539\u3002\u4f46\u662f\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20\uff1a<\/p>\n

1. \u521d\u59cb\u5316\u6570\u7ec4\u65f6\u6dfb\u52a0\u5143\u7d20<\/strong><\/p>\n

\u5728\u521d\u59cb\u5316\u6570\u7ec4\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5927\u62ec\u53f7 ({}) \u6307\u5b9a\u5143\u7d20\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

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

int[] numbers = {1, 2, 3, 4, 5};<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
2. \u4f7f\u7528\u6570\u7ec4\u5143\u7d20\u5f15\u7528\u76f4\u63a5\u8d4b\u503c<\/strong><\/p>\n
\u5982\u679c\u6570\u7ec4\u5df2\u7ecf\u521d\u59cb\u5316\uff0c\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u5143\u7d20\u5f15\u7528\u76f4\u63a5\u5411\u7279\u5b9a\u7d22\u5f15\u5904\u8d4b\u503c\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
numbers[4] = 6; \/\/ \u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u7b2c 5 \u4e2a\u7d22\u5f15\u5904<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n
    \n
  • \u7d22\u5f15\u4ece 0 \u5f00\u59cb\u3002<\/li>\n
  • \u8d85\u51fa\u6570\u7ec4\u8fb9\u754c\uff08\u6570\u7ec4\u957f\u5ea6 – 1\uff09\u7684\u7d22\u5f15\u4f1a\u629b\u51fa IndexOutOfBoundsException \u5f02\u5e38\u3002<\/li>\n<\/ul>\n
    3. \u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5<\/strong><\/p>\n
    Arrays.copyOf() \u65b9\u6cd5\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u539f\u59cb\u6570\u7ec4\u7684\u5143\u7d20\u4ee5\u53ca\u989d\u5916\u5143\u7d20\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
    int[] newArray = Arrays.copyOf(numbers, numbers.length + 1);<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u65b0\u6570\u7ec4 (newArray) \u7684\u957f\u5ea6\u5c06\u53d8\u4e3a\u539f\u59cb\u6570\u7ec4 (numbers) \u7684\u957f\u5ea6\u52a0 1\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u5c06\u65b0\u5143\u7d20\u6dfb\u52a0\u5230\u65b0\u6570\u7ec4\u4e2d\uff1a<\/p>\n
    newArray[newArray.length - 1] = 6;<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u5982\u679c\u60a8\u4f7f\u7528\u7684\u662f Java 9 \u6216\u66f4\u9ad8\u7248\u672c\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5\u7684\u7b2c\u4e8c\u4e2a\u91cd\u8f7d\u7248\u672c\uff0c\u8be5\u7248\u672c\u5141\u8bb8\u6307\u5b9a\u8981\u590d\u5236\u7684\u5143\u7d20\u8303\u56f4\uff1a<\/p>\n
    int[] newArray = Arrays.copyOfRange(numbers, 0, numbers.length - 1);<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u8fd9\u4e2a\u91cd\u8f7d\u5141\u8bb8\u60a8\u521b\u5efa\u5305\u542b\u539f\u59cb\u6570\u7ec4\u90e8\u5206\u5143\u7d20\u7684\u65b0\u6570\u7ec4\u3002<\/p>\n
    4. \u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93<\/strong><\/p>\n
    \u6709\u8bb8\u591a\u7b2c\u4e09\u65b9\u5e93\u63d0\u4f9b\u4e86\u65b9\u4fbf\u7684\u65b9\u6cd5\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20\u3002\u4f8b\u5982\uff0cGuava \u5e93\u63d0\u4f9b\u4e86 Lists.newArrayList() \u65b9\u6cd5\uff0c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u539f\u59cb\u6570\u7ec4\u5143\u7d20\u7684\u65b0\u5217\u8868\uff0c\u7136\u540e\u53ef\u4ee5\u901a\u8fc7 add() \u65b9\u6cd5\u5411\u5217\u8868\u4e2d\u6dfb\u52a0\u5143\u7d20\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662fJava\u4e2d\u600e\u4e48\u5728\u6570\u7ec4\u4e2d\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":"
    \u5411 java \u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u6709\u56db\u79cd\u65b9\u6cd5\uff1a\u521d\u59cb\u5316\u6570\u7ec4\u65f6\u6307\u5b9a\u5143\u7d20\u3002\u4f7f\u7528\u6570\u7ec4\u5143\u7d20\u5f15\u7528\u76f4\u63a5\u8d4b\u503c\u3002\u4f7f\u7528 arrays.copyof() \u65b9\u6cd5\u521b\u5efa\u65b0\u6570\u7ec4\u6dfb\u52a0\u5143\u7d20\u3002\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\uff08\u5982 guava\uff09\u521b\u5efa\u5217\u8868\u5e76\u6dfb\u52a0\u5143\u7d20\u3002 \u5982\u4f55\u5411 Java \u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20 Java \u6570\u7ec4\u662f\u56fa\u5b9a\u957f\u5ea6\u7684\u5143\u7d20\u6709\u5e8f\u96c6\u5408\u3002\u4e00\u65e6\u521b\u5efa\uff0c\u6570\u7ec4\u7684\u5927\u5c0f\u5c31\u4e0d\u80fd\u66f4\u6539\u3002\u4f46\u662f\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20\uff1a 1. \u521d\u59cb\u5316\u6570\u7ec4\u65f6\u6dfb\u52a0\u5143\u7d20 \u5728\u521d\u59cb\u5316\u6570\u7ec4\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5927\u62ec\u53f7 ({}) \u6307\u5b9a\u5143\u7d20\uff0c\u5982\u4e0b\u6240\u793a\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b int[] numbers = {1, 2, 3, 4, 5}; \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528\u6570\u7ec4\u5143\u7d20\u5f15\u7528\u76f4\u63a5\u8d4b\u503c \u5982\u679c\u6570\u7ec4\u5df2\u7ecf\u521d\u59cb\u5316\uff0c\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u5143\u7d20\u5f15\u7528\u76f4\u63a5\u5411\u7279\u5b9a\u7d22\u5f15\u5904\u8d4b\u503c\uff0c\u5982\u4e0b\u6240\u793a\uff1a numbers[4] = 6; \/\/ \u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u6570\u7ec4\u7684\u7b2c 5 \u4e2a\u7d22\u5f15\u5904 \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\u4e8b\u9879\uff1a \u7d22\u5f15\u4ece 0 \u5f00\u59cb\u3002 \u8d85\u51fa\u6570\u7ec4\u8fb9\u754c\uff08\u6570\u7ec4\u957f\u5ea6 – 1\uff09\u7684\u7d22\u5f15\u4f1a\u629b\u51fa IndexOutOfBoundsException \u5f02\u5e38\u3002 3. \u4f7f\u7528 Arrays.copyOf() \u65b9\u6cd5 Arrays.copyOf() \u65b9\u6cd5\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u539f\u59cb\u6570\u7ec4\u7684\u5143\u7d20\u4ee5\u53ca\u989d\u5916\u5143\u7d20\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a int[] newArray = […]<\/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-35398","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/35398","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=35398"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/35398\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=35398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=35398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=35398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}