{"id":38598,"date":"2024-11-26T08:24:22","date_gmt":"2024-11-26T00:24:22","guid":{"rendered":"https:\/\/fwq.ai\/blog\/38598\/"},"modified":"2024-11-26T08:24:22","modified_gmt":"2024-11-26T00:24:22","slug":"java%e6%95%b0%e7%bb%84%e5%85%83%e7%b4%a0%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%98%af%e5%90%a6%e4%b8%ba%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/38598\/","title":{"rendered":"java\u6570\u7ec4\u5143\u7d20\u600e\u4e48\u5224\u65ad\u662f\u5426\u4e3a\u7a7a"},"content":{"rendered":"<blockquote><p>\n  java\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u53ef\u4ee5\u901a\u8fc7== null\u64cd\u4f5c\u7b26\u5224\u65ad\u3002\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u672a\u521d\u59cb\u5316\u7684\u5143\u7d20\u81ea\u52a8\u521d\u59cb\u5316\u4e3a\u9ed8\u8ba4\u503c\uff0c\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u65e0\u610f\u4e49\u3002\u800c\u5bf9\u4e8e\u5bf9\u8c61\u6570\u7ec4\uff0c\u672a\u521d\u59cb\u5316\u7684\u5143\u7d20\u521d\u59cb\u5316\u4e3anull\uff0c\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u5f88\u6709\u7528\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/15\/2024111503391669701.jpg\" class=\"aligncenter\" title=\"java\u6570\u7ec4\u5143\u7d20\u600e\u4e48\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u63d2\u56fe\" alt=\"java\u6570\u7ec4\u5143\u7d20\u600e\u4e48\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u63d2\u56fe\" \/><\/p>\n<p><strong>Java \u6570\u7ec4\u5143\u7d20\u5224\u65ad\u662f\u5426\u4e3a\u7a7a<\/strong><\/p>\n<p><strong>\u56de\u7b54\uff1a<\/strong><\/p>\n<p>\u5224\u65ad Java \u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u4f7f\u7528 == null \u64cd\u4f5c\u7b26\u3002<\/p>\n<p><strong>\u8be6\u7ec6\u8bf4\u660e\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>Java \u6570\u7ec4\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b83\u53ef\u4ee5\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6216\u5bf9\u8c61\u5f15\u7528\u3002\u5f53\u4e00\u4e2a\u6570\u7ec4\u5143\u7d20\u672a\u88ab\u8d4b\u503c\u65f6\uff0c\u5b83\u7684\u503c\u9ed8\u8ba4\u4e3a null\u3002\u56e0\u6b64\uff0c\u8981\u5224\u65ad\u4e00\u4e2a\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u5c06\u5b83\u4e0e null \u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<pre>\/\/ \u521b\u5efa\u4e00\u4e2a\u6574\u578b\u6570\u7ec4\nint[] arr = new int[5];\n\n\/\/ \u5224\u65ad\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\nif (arr[0] == null) {\n    \/\/ \u5143\u7d20\u4e3a\u7a7a\n} else {\n    \/\/ \u5143\u7d20\u4e0d\u4e3a\u7a7a\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5bf9\u4e8e\u5bf9\u8c61\u6570\u7ec4\uff0c\u540c\u6837\u53ef\u4ee5\u4f7f\u7528 == null \u5224\u65ad\u5176\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<pre>\/\/ \u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\nString[] arr = new String[5];\n\n\/\/ \u5224\u65ad\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\nif (arr[0] == null) {\n    \/\/ \u5143\u7d20\u4e3a\u7a7a\n} else {\n    \/\/ \u5143\u7d20\u4e0d\u4e3a\u7a7a\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u5982\u679c\u6570\u7ec4\u672a\u521d\u59cb\u5316\uff0c\u5219\u6240\u6709\u5143\u7d20\u90fd\u5c06\u81ea\u52a8\u521d\u59cb\u5316\u4e3a\u8be5\u7c7b\u578b\u7684\u9ed8\u8ba4\u503c\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u901a\u5e38\u6ca1\u6709\u610f\u4e49\u3002<\/li>\n<li>\u5bf9\u4e8e\u5bf9\u8c61\u6570\u7ec4\uff0c\u5982\u679c\u672a\u521d\u59cb\u5316\u6570\u7ec4\uff0c\u5219\u6240\u6709\u5143\u7d20\u90fd\u5c06\u88ab\u521d\u59cb\u5316\u4e3a null\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e\u5bf9\u8c61\u6570\u7ec4\uff0c\u5224\u65ad\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u662f\u5f88\u6709\u7528\u7684\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u6570\u7ec4\u5143\u7d20\u600e\u4e48\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\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>java\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u53ef\u4ee5\u901a\u8fc7== null\u64cd\u4f5c\u7b26\u5224\u65ad\u3002\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u672a\u521d\u59cb\u5316\u7684\u5143\u7d20\u81ea\u52a8\u521d\u59cb\u5316\u4e3a\u9ed8\u8ba4\u503c\uff0c\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u65e0\u610f\u4e49\u3002\u800c\u5bf9\u4e8e\u5bf9\u8c61\u6570\u7ec4\uff0c\u672a\u521d\u59cb\u5316\u7684\u5143\u7d20\u521d\u59cb\u5316\u4e3anull\uff0c\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u5f88\u6709\u7528\u3002 Java \u6570\u7ec4\u5143\u7d20\u5224\u65ad\u662f\u5426\u4e3a\u7a7a \u56de\u7b54\uff1a \u5224\u65ad Java \u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u4f7f\u7528 == null \u64cd\u4f5c\u7b26\u3002 \u8be6\u7ec6\u8bf4\u660e\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b Java \u6570\u7ec4\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b83\u53ef\u4ee5\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6216\u5bf9\u8c61\u5f15\u7528\u3002\u5f53\u4e00\u4e2a\u6570\u7ec4\u5143\u7d20\u672a\u88ab\u8d4b\u503c\u65f6\uff0c\u5b83\u7684\u503c\u9ed8\u8ba4\u4e3a null\u3002\u56e0\u6b64\uff0c\u8981\u5224\u65ad\u4e00\u4e2a\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u5c06\u5b83\u4e0e null \u8fdb\u884c\u6bd4\u8f83\u3002 \/\/ \u521b\u5efa\u4e00\u4e2a\u6574\u578b\u6570\u7ec4 int[] arr = new int[5]; \/\/ \u5224\u65ad\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a if (arr[0] == null) { \/\/ \u5143\u7d20\u4e3a\u7a7a } else { \/\/ \u5143\u7d20\u4e0d\u4e3a\u7a7a } \u767b\u5f55\u540e\u590d\u5236 \u5bf9\u4e8e\u5bf9\u8c61\u6570\u7ec4\uff0c\u540c\u6837\u53ef\u4ee5\u4f7f\u7528 == null \u5224\u65ad\u5176\u5143\u7d20\u662f\u5426\u4e3a\u7a7a\u3002 \/\/ \u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4 String[] arr = new String[5]; \/\/ \u5224\u65ad\u6570\u7ec4\u5143\u7d20\u662f\u5426\u4e3a\u7a7a if 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