{"id":65624,"date":"2025-05-03T13:20:50","date_gmt":"2025-05-03T05:20:50","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65624\/"},"modified":"2025-05-03T13:20:50","modified_gmt":"2025-05-03T05:20:50","slug":"java%e6%80%8e%e4%b9%88%e9%81%bf%e5%85%8d%e6%95%b0%e7%bb%84%e4%b8%8b%e6%a0%87%e8%b6%8a%e7%95%8c-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65624\/","title":{"rendered":"java\u600e\u4e48\u907f\u514d\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c"},"content":{"rendered":"

\n \u907f\u514d java \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u53ef\u4ee5\u901a\u8fc7\u516d\u79cd\u63aa\u65bd\u5b9e\u73b0\uff1a1. \u660e\u786e\u6570\u7ec4\u8fb9\u754c\uff1b2. \u4f7f\u7528\u8fb9\u754c\u68c0\u67e5\uff1b3. \u4f7f\u7528 try-catch \u5757\uff1b4. \u4f7f\u7528\u8fb9\u754c\u68c0\u67e5\u5e93\uff1b5. \u4f7f\u7528\u5faa\u73af\u4ee3\u66ff\u4e0b\u6807\uff1b6. \u4f7f\u7528\u6570\u7ec4\u5de5\u5177\u7c7b arrays.copyofrange()\u3002\n<\/p><\/blockquote>\n

\"java\u600e\u4e48\u907f\u514d\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u907f\u514d Java \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c<\/strong><\/p>\n

\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u662f\u6307\u8bbf\u95ee\u6570\u7ec4\u65f6\u4f7f\u7528\u7684\u7d22\u5f15\u8d85\u51fa\u4e86\u6570\u7ec4\u7684\u8fb9\u754c\u3002\u8fd9\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u6216\u4ea7\u751f\u9519\u8bef\u7684\u7ed3\u679c\u3002<\/p>\n

\u907f\u514d\u4e0b\u6807\u8d8a\u754c\u7684\u63aa\u65bd<\/strong><\/p>\n

1. \u660e\u786e\u6570\u7ec4\u8fb9\u754c<\/strong>
\u5728\u4f7f\u7528\u6570\u7ec4\u4e4b\u524d\uff0c\u5fc5\u987b\u660e\u786e\u6570\u7ec4\u7684\u8fb9\u754c\u3002\u53ef\u4ee5\u4f7f\u7528 length \u5b57\u6bb5\u83b7\u53d6\u6570\u7ec4\u7684\u5927\u5c0f\u3002<\/p>\n

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

2. \u4f7f\u7528\u8fb9\u754c\u68c0\u67e5<\/strong>
\u5728\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\u4e4b\u524d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u5728\u8fb9\u754c\u5185\u3002<\/p>\n

int[] arr = {1, 2, 3};\nint index = 4;\n\nif (index >= 0 && index < arr.length) {\n    \/\/ \u7d22\u5f15\u5728\u8fb9\u754c\u5185\uff0c\u8bbf\u95ee\u5143\u7d20\n} else {\n    \/\/ \u7d22\u5f15\u8d8a\u754c\uff0c\u5904\u7406\u9519\u8bef\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
3. \u4f7f\u7528 try-catch \u5757<\/strong>
\u53ef\u4ee5\u4f7f\u7528 try-catch \u5757\u6765\u6355\u83b7\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u7684\u5f02\u5e38\u3002<\/p>\n
try {\n    int[] arr = {1, 2, 3};\n    int index = 4;\n    System.out.println(arr[index]);\n} catch (IndexOutOfBoundsException e) {\n    \/\/ \u5904\u7406\u7d22\u5f15\u8d8a\u754c\u7684\u5f02\u5e38\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
4. \u4f7f\u7528\u8fb9\u754c\u68c0\u67e5\u5e93<\/strong>
\u53ef\u4ee5\u4f7f\u7528 Apache Commons ArrayUtils \u7b49\u5e93\u6765\u7b80\u5316\u8fb9\u754c\u68c0\u67e5\u3002<\/p>\n
5. \u4f7f\u7528\u5faa\u73af\u4ee3\u66ff\u4e0b\u6807<\/strong>
\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u904d\u5386\u6570\u7ec4\u5143\u7d20\uff0c\u800c\u65e0\u9700\u6307\u5b9a\u7d22\u5f15\u3002<\/p>\n
int[] arr = {1, 2, 3};\nfor (int element : arr) {\n    \/\/ \u904d\u5386\u6570\u7ec4\u5143\u7d20\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
6. \u4f7f\u7528\u6570\u7ec4\u5de5\u5177\u7c7b<\/strong>
Java 9 \u5f15\u5165\u4e86 Arrays.copyOfRange() \u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u521b\u5efa\u6307\u5b9a\u8303\u56f4\u5185\u7684\u6570\u7ec4\u526f\u672c\uff0c\u4ece\u800c\u907f\u514d\u4e0b\u6807\u8d8a\u754c\u3002<\/p>\n
int[] arr = {1, 2, 3, 4, 5};\nint[] subArray = Arrays.copyOfRange(arr, 1, 3);<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u901a\u8fc7\u9075\u5faa\u8fd9\u4e9b\u63aa\u65bd\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d Java \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\uff0c\u4ece\u800c\u786e\u4fdd\u7a0b\u5e8f\u7684\u7a33\u5b9a\u6027\u548c\u6b63\u786e\u6027\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u907f\u514d\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u907f\u514d java \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u53ef\u4ee5\u901a\u8fc7\u516d\u79cd\u63aa\u65bd\u5b9e\u73b0\uff1a1. \u660e\u786e\u6570\u7ec4\u8fb9\u754c\uff1b2. \u4f7f\u7528\u8fb9\u754c\u68c0\u67e5\uff1b3. \u4f7f\u7528 try-catch \u5757\uff1b4. \u4f7f\u7528\u8fb9\u754c\u68c0\u67e5\u5e93\uff1b5. \u4f7f\u7528\u5faa\u73af\u4ee3\u66ff\u4e0b\u6807\uff1b6. \u4f7f\u7528\u6570\u7ec4\u5de5\u5177\u7c7b arrays.copyofrange()\u3002 \u5982\u4f55\u907f\u514d Java \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u662f\u6307\u8bbf\u95ee\u6570\u7ec4\u65f6\u4f7f\u7528\u7684\u7d22\u5f15\u8d85\u51fa\u4e86\u6570\u7ec4\u7684\u8fb9\u754c\u3002\u8fd9\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u6216\u4ea7\u751f\u9519\u8bef\u7684\u7ed3\u679c\u3002 \u907f\u514d\u4e0b\u6807\u8d8a\u754c\u7684\u63aa\u65bd 1. \u660e\u786e\u6570\u7ec4\u8fb9\u754c\u5728\u4f7f\u7528\u6570\u7ec4\u4e4b\u524d\uff0c\u5fc5\u987b\u660e\u786e\u6570\u7ec4\u7684\u8fb9\u754c\u3002\u53ef\u4ee5\u4f7f\u7528 length \u5b57\u6bb5\u83b7\u53d6\u6570\u7ec4\u7684\u5927\u5c0f\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b 2. \u4f7f\u7528\u8fb9\u754c\u68c0\u67e5\u5728\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\u4e4b\u524d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u8bed\u53e5\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u5728\u8fb9\u754c\u5185\u3002 int[] arr = {1, 2, 3}; int index = 4; if (index >= 0 && index < arr.length) { \/\/ \u7d22\u5f15\u5728\u8fb9\u754c\u5185\uff0c\u8bbf\u95ee\u5143\u7d20 } else { \/\/ \u7d22\u5f15\u8d8a\u754c\uff0c\u5904\u7406\u9519\u8bef } \u767b\u5f55\u540e\u590d\u5236 3. \u4f7f\u7528 try-catch […]<\/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-65624","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65624","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=65624"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65624\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}