{"id":66744,"date":"2025-05-03T09:09:01","date_gmt":"2025-05-03T01:09:01","guid":{"rendered":"https:\/\/fwq.ai\/blog\/66744\/"},"modified":"2025-05-03T09:09:01","modified_gmt":"2025-05-03T01:09:01","slug":"java%e6%80%8e%e4%b9%88%e7%bb%99%e7%b1%bb%e4%b8%ad%e7%9a%84%e6%95%b0%e7%bb%84%e5%ae%9e%e4%be%8b%e5%8c%96-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/66744\/","title":{"rendered":"Java\u600e\u4e48\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316"},"content":{"rendered":"<blockquote><p>\n  \u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a\u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b\u548c\u540d\u79f0\u3002\u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u6570\u7ec4\uff0c\u5e76\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111621280535037.jpg\" class=\"aligncenter\" title=\"Java\u600e\u4e48\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\u63d2\u56fe\" alt=\"Java\u600e\u4e48\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\u63d2\u56fe\" \/><\/p>\n<p><strong>Java\u4e2d\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316<\/strong><\/p>\n<p><strong>\u5982\u4f55\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\uff1f<\/strong><\/p>\n<p>\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li> <strong>\u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b\u548c\u540d\u79f0<\/strong>\uff1a\u5728\u7c7b\u7684\u58f0\u660e\u4e2d\uff0c\u5b9a\u4e49\u6570\u7ec4\u7684\u7c7b\u578b\uff08\u5982int[]\u6216String[]\uff09\u548c\u540d\u79f0\uff08\u5982array\uff09\u3002<\/li>\n<li> <strong>\u521b\u5efa\u6570\u7ec4<\/strong>\uff1a\u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u6570\u7ec4\uff0c\u5e76\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002\u4f8b\u5982\uff1aint[] array = new int[5];<\/li>\n<\/ol>\n<p><strong>\u5b9e\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>public class MyClass {\n    private int[] array;\n\n    public MyClass(int size) {\n        array = new int[size];\n    }\n\n    \/\/ \u5176\u4ed6\u65b9\u6cd5...\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u8be6\u7ec6\u5c55\u5f00\uff1a<\/strong><\/p>\n<ul>\n<li> <strong>\u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b\u548c\u540d\u79f0<\/strong>\uff1a\u8fd9\u79cd\u65b9\u5f0f\u521b\u5efa\u7684\u6570\u7ec4\u88ab\u79f0\u4e3a\u7a7a\u6570\u7ec4\uff0c\u56e0\u4e3a\u5b83\u8fd8\u6ca1\u6709\u88ab\u4efb\u4f55\u503c\u521d\u59cb\u5316\u3002<\/li>\n<li> <strong>\u521b\u5efa\u6570\u7ec4<\/strong>\uff1anew\u5173\u952e\u5b57\u521b\u5efa\u4e00\u4e2a\u6307\u5b9a\u5927\u5c0f\u7684\u65b0\u6570\u7ec4\u3002\u6570\u7ec4\u5927\u5c0f\u51b3\u5b9a\u4e86\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/li>\n<li> <strong>\u6784\u9020\u51fd\u6570<\/strong>\uff1a\u53ef\u4ee5\u5728\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e2d\u5b9e\u4f8b\u5316\u6570\u7ec4\u3002\u6784\u9020\u51fd\u6570\u4f1a\u5728\u5bf9\u8c61\u521b\u5efa\u65f6\u88ab\u8c03\u7528\u3002\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cMyClass\u7c7b\u7684\u6784\u9020\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u6574\u6570\u53c2\u6570size\uff0c\u5e76\u4f7f\u7528\u5b83\u6765\u5b9e\u4f8b\u5316array\u6570\u7ec4\u3002<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<ul>\n<li>\u6570\u7ec4\u7684\u5927\u5c0f\u5fc5\u987b\u4e3a\u975e\u8d1f\u6574\u6570\u3002<\/li>\n<li>\u4e00\u65e6\u6570\u7ec4\u88ab\u5b9e\u4f8b\u5316\uff0c\u5b83\u7684\u957f\u5ea6\u5c31\u4e0d\u80fd\u6539\u53d8\u3002<\/li>\n<li>\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u9ed8\u8ba4\u88ab\u521d\u59cb\u5316\u4e3a\u96f6\u503c\u6216null\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u6570\u7ec4\u7684\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fJava\u600e\u4e48\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a\u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b\u548c\u540d\u79f0\u3002\u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u6570\u7ec4\uff0c\u5e76\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002 Java\u4e2d\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316 \u5982\u4f55\u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\uff1f \u7ed9\u7c7b\u4e2d\u7684\u6570\u7ec4\u5b9e\u4f8b\u5316\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a \u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b\u548c\u540d\u79f0\uff1a\u5728\u7c7b\u7684\u58f0\u660e\u4e2d\uff0c\u5b9a\u4e49\u6570\u7ec4\u7684\u7c7b\u578b\uff08\u5982int[]\u6216String[]\uff09\u548c\u540d\u79f0\uff08\u5982array\uff09\u3002 \u521b\u5efa\u6570\u7ec4\uff1a\u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u6570\u7ec4\uff0c\u5e76\u6307\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\u3002\u4f8b\u5982\uff1aint[] array = new int[5]; \u5b9e\u4f8b\u4ee3\u7801\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b public class MyClass { private int[] array; public MyClass(int size) { array = new int[size]; } \/\/ \u5176\u4ed6\u65b9\u6cd5&#8230; } \u767b\u5f55\u540e\u590d\u5236 \u8be6\u7ec6\u5c55\u5f00\uff1a \u5b9a\u4e49\u6570\u7ec4\u7c7b\u578b\u548c\u540d\u79f0\uff1a\u8fd9\u79cd\u65b9\u5f0f\u521b\u5efa\u7684\u6570\u7ec4\u88ab\u79f0\u4e3a\u7a7a\u6570\u7ec4\uff0c\u56e0\u4e3a\u5b83\u8fd8\u6ca1\u6709\u88ab\u4efb\u4f55\u503c\u521d\u59cb\u5316\u3002 \u521b\u5efa\u6570\u7ec4\uff1anew\u5173\u952e\u5b57\u521b\u5efa\u4e00\u4e2a\u6307\u5b9a\u5927\u5c0f\u7684\u65b0\u6570\u7ec4\u3002\u6570\u7ec4\u5927\u5c0f\u51b3\u5b9a\u4e86\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002 \u6784\u9020\u51fd\u6570\uff1a\u53ef\u4ee5\u5728\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e2d\u5b9e\u4f8b\u5316\u6570\u7ec4\u3002\u6784\u9020\u51fd\u6570\u4f1a\u5728\u5bf9\u8c61\u521b\u5efa\u65f6\u88ab\u8c03\u7528\u3002\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cMyClass\u7c7b\u7684\u6784\u9020\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u6574\u6570\u53c2\u6570size\uff0c\u5e76\u4f7f\u7528\u5b83\u6765\u5b9e\u4f8b\u5316array\u6570\u7ec4\u3002 \u6ce8\u610f\u4e8b\u9879\uff1a 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