{"id":37048,"date":"2024-11-26T12:22:27","date_gmt":"2024-11-26T04:22:27","guid":{"rendered":"https:\/\/fwq.ai\/blog\/37048\/"},"modified":"2024-11-26T12:22:27","modified_gmt":"2024-11-26T04:22:27","slug":"java%e6%95%b0%e7%bb%84%e6%98%af%e6%80%8e%e4%b9%88%e7%94%b3%e8%af%b7","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/37048\/","title":{"rendered":"java\u6570\u7ec4\u662f\u600e\u4e48\u7533\u8bf7"},"content":{"rendered":"<blockquote><p>\n  \u65b9\u6cd5\uff1a\u4f7f\u7528new\u5173\u952e\u5b57\u6216\u6570\u7ec4\u5b57\u9762\u91cf\u3002\u6570\u7ec4\u5927\u5c0f\uff1a\u5728\u7533\u8bf7\u65f6\u6307\u5b9a\uff0c\u4e0d\u80fd\u66f4\u6539\u3002\u5143\u7d20\u8bbf\u95ee\uff1a\u901a\u8fc7\u7d22\u5f15\u4ece0\u5f00\u59cb\u3002\u6ce8\u610f\u4e8b\u9879\uff1a\u6570\u7ec4\u4e0d\u80fd\u4e3anull\uff0c\u7d22\u5f15\u8303\u56f4\u5fc5\u987b\u57280\u5230\u6570\u7ec4\u5927\u5c0f\uff08\u51cf1\uff09\u4e4b\u95f4\uff0c\u5143\u7d20\u9ed8\u8ba4\u503c\u53d6\u51b3\u4e8e\u7c7b\u578b\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111300155711812.jpg\" class=\"aligncenter\" title=\"java\u6570\u7ec4\u662f\u600e\u4e48\u7533\u8bf7\u63d2\u56fe\" alt=\"java\u6570\u7ec4\u662f\u600e\u4e48\u7533\u8bf7\u63d2\u56fe\" \/><\/p>\n<p><strong>Java\u6570\u7ec4\u7533\u8bf7\u65b9\u6cd5<\/strong><\/p>\n<p>\u5728Java\u4e2d\uff0c\u6570\u7ec4\u662f\u4e00\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u7528\u4e8e\u5b58\u50a8\u76f8\u540c\u7c7b\u578b\u5143\u7d20\u7684\u96c6\u5408\u3002\u7533\u8bf7Java\u6570\u7ec4\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u4ee5\u4e0b\u662f\u4e24\u79cd\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528new\u5173\u952e\u5b57<\/strong><\/p>\n<pre>int[] arr = new int[5];<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u901a\u8fc7\u4f7f\u7528new\u5173\u952e\u5b57\u4e3a\u6307\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4\u5206\u914d\u5185\u5b58\u3002arr\u662f\u4e00\u4e2a\u5f15\u7528\u53d8\u91cf\uff0c\u5b83\u5c06\u6307\u5411\u5206\u914d\u7684\u6570\u7ec4\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p><strong>2. \u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf<\/strong><\/p>\n<pre>int[] arr = {1, 2, 3, 4, 5};<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u6570\u7ec4\u5b57\u9762\u91cf\u901a\u8fc7\u76f4\u63a5\u6307\u5b9a\u6570\u7ec4\u5143\u7d20\u7684\u503c\u6765\u521b\u5efa\u6570\u7ec4\u3002\u6b64\u65b9\u6cd5\u53ea\u9002\u7528\u4e8e\u521d\u59cb\u5316\u6570\u7ec4\u65f6\uff0c\u65e0\u6cd5\u52a8\u6001\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002<\/p>\n<p><strong>\u6570\u7ec4\u5927\u5c0f<\/strong><\/p>\n<p>\u5728\u7533\u8bf7Java\u6570\u7ec4\u65f6\uff0c\u5fc5\u987b\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002\u6570\u7ec4\u5927\u5c0f\u8868\u793a\u6570\u7ec4\u4e2d\u53ef\u4ee5\u5b58\u50a8\u7684\u5143\u7d20\u6570\u91cf\u3002\u6570\u7ec4\u5927\u5c0f\u4e00\u65e6\u6307\u5b9a\uff0c\u4fbf\u4e0d\u80fd\u66f4\u6539\u3002<\/p>\n<p><strong>\u6570\u7ec4\u5143\u7d20<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u8bbf\u95ee\u548c\u64cd\u4f5c\u6570\u7ec4\u5143\u7d20\u3002\u7d22\u5f15\u662f\u4ece0\u5f00\u59cb\u7684\u6574\u6570\uff0c\u6307\u5b9a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4f4d\u7f6e\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>arr[0] = 10; \/\/ \u7ed9\u6570\u7ec4\u7b2c\u4e00\u4e2a\u5143\u7d20\u8d4b\u503c\u4e3a10\nint value = arr[2]; \/\/ \u83b7\u53d6\u6570\u7ec4\u7b2c\u4e09\u4e2a\u5143\u7d20\u7684\u503c<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<ul>\n<li>\u6570\u7ec4\u4e0d\u80fd\u4e3anull\u3002\u5c1d\u8bd5\u8bbf\u95eenull\u6570\u7ec4\u4f1a\u5bfc\u81f4NullPointerException\u5f02\u5e38\u3002<\/li>\n<li>\u7d22\u5f15\u5fc5\u987b\u57280\u548c\u6570\u7ec4\u5927\u5c0f\uff08\u51cf1\uff09\u4e4b\u95f4\u3002\u8d85\u51fa\u6b64\u8303\u56f4\u4f1a\u5f15\u53d1ArrayIndexOutOfBoundsException\u5f02\u5e38\u3002<\/li>\n<li>\u6570\u7ec4\u5143\u7d20\u9ed8\u8ba4\u503c\u53d6\u51b3\u4e8e\u5143\u7d20\u7c7b\u578b\u3002\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\uff08\u5982int\u3001double\uff09\uff0c\u9ed8\u8ba4\u503c\u4e3a0\u3002\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\uff08\u5982String\uff09\uff0c\u9ed8\u8ba4\u503c\u4e3anull\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u6570\u7ec4\u662f\u600e\u4e48\u7533\u8bf7\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":"<p>\u65b9\u6cd5\uff1a\u4f7f\u7528new\u5173\u952e\u5b57\u6216\u6570\u7ec4\u5b57\u9762\u91cf\u3002\u6570\u7ec4\u5927\u5c0f\uff1a\u5728\u7533\u8bf7\u65f6\u6307\u5b9a\uff0c\u4e0d\u80fd\u66f4\u6539\u3002\u5143\u7d20\u8bbf\u95ee\uff1a\u901a\u8fc7\u7d22\u5f15\u4ece0\u5f00\u59cb\u3002\u6ce8\u610f\u4e8b\u9879\uff1a\u6570\u7ec4\u4e0d\u80fd\u4e3anull\uff0c\u7d22\u5f15\u8303\u56f4\u5fc5\u987b\u57280\u5230\u6570\u7ec4\u5927\u5c0f\uff08\u51cf1\uff09\u4e4b\u95f4\uff0c\u5143\u7d20\u9ed8\u8ba4\u503c\u53d6\u51b3\u4e8e\u7c7b\u578b\u3002 Java\u6570\u7ec4\u7533\u8bf7\u65b9\u6cd5 \u5728Java\u4e2d\uff0c\u6570\u7ec4\u662f\u4e00\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u7528\u4e8e\u5b58\u50a8\u76f8\u540c\u7c7b\u578b\u5143\u7d20\u7684\u96c6\u5408\u3002\u7533\u8bf7Java\u6570\u7ec4\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u4ee5\u4e0b\u662f\u4e24\u79cd\u6700\u5e38\u7528\u7684\u65b9\u6cd5\uff1a 1. \u4f7f\u7528new\u5173\u952e\u5b57 int[] arr = new int[5]; \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u79cd\u65b9\u6cd5\u901a\u8fc7\u4f7f\u7528new\u5173\u952e\u5b57\u4e3a\u6307\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4\u5206\u914d\u5185\u5b58\u3002arr\u662f\u4e00\u4e2a\u5f15\u7528\u53d8\u91cf\uff0c\u5b83\u5c06\u6307\u5411\u5206\u914d\u7684\u6570\u7ec4\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b 2. \u4f7f\u7528\u6570\u7ec4\u5b57\u9762\u91cf int[] arr = {1, 2, 3, 4, 5}; \u767b\u5f55\u540e\u590d\u5236 \u6570\u7ec4\u5b57\u9762\u91cf\u901a\u8fc7\u76f4\u63a5\u6307\u5b9a\u6570\u7ec4\u5143\u7d20\u7684\u503c\u6765\u521b\u5efa\u6570\u7ec4\u3002\u6b64\u65b9\u6cd5\u53ea\u9002\u7528\u4e8e\u521d\u59cb\u5316\u6570\u7ec4\u65f6\uff0c\u65e0\u6cd5\u52a8\u6001\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002 \u6570\u7ec4\u5927\u5c0f \u5728\u7533\u8bf7Java\u6570\u7ec4\u65f6\uff0c\u5fc5\u987b\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002\u6570\u7ec4\u5927\u5c0f\u8868\u793a\u6570\u7ec4\u4e2d\u53ef\u4ee5\u5b58\u50a8\u7684\u5143\u7d20\u6570\u91cf\u3002\u6570\u7ec4\u5927\u5c0f\u4e00\u65e6\u6307\u5b9a\uff0c\u4fbf\u4e0d\u80fd\u66f4\u6539\u3002 \u6570\u7ec4\u5143\u7d20 \u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u8bbf\u95ee\u548c\u64cd\u4f5c\u6570\u7ec4\u5143\u7d20\u3002\u7d22\u5f15\u662f\u4ece0\u5f00\u59cb\u7684\u6574\u6570\uff0c\u6307\u5b9a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4f4d\u7f6e\u3002\u4f8b\u5982\uff1a arr[0] = 10; \/\/ \u7ed9\u6570\u7ec4\u7b2c\u4e00\u4e2a\u5143\u7d20\u8d4b\u503c\u4e3a10 int value = arr[2]; \/\/ \u83b7\u53d6\u6570\u7ec4\u7b2c\u4e09\u4e2a\u5143\u7d20\u7684\u503c \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\u4e8b\u9879 \u6570\u7ec4\u4e0d\u80fd\u4e3anull\u3002\u5c1d\u8bd5\u8bbf\u95eenull\u6570\u7ec4\u4f1a\u5bfc\u81f4NullPointerException\u5f02\u5e38\u3002 \u7d22\u5f15\u5fc5\u987b\u57280\u548c\u6570\u7ec4\u5927\u5c0f\uff08\u51cf1\uff09\u4e4b\u95f4\u3002\u8d85\u51fa\u6b64\u8303\u56f4\u4f1a\u5f15\u53d1ArrayIndexOutOfBoundsException\u5f02\u5e38\u3002 \u6570\u7ec4\u5143\u7d20\u9ed8\u8ba4\u503c\u53d6\u51b3\u4e8e\u5143\u7d20\u7c7b\u578b\u3002\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\uff08\u5982int\u3001double\uff09\uff0c\u9ed8\u8ba4\u503c\u4e3a0\u3002\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\uff08\u5982String\uff09\uff0c\u9ed8\u8ba4\u503c\u4e3anull\u3002 \u4ee5\u4e0a\u5c31\u662fjava\u6570\u7ec4\u662f\u600e\u4e48\u7533\u8bf7\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-37048","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37048","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=37048"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37048\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=37048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=37048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=37048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}