{"id":37633,"date":"2024-11-26T13:42:34","date_gmt":"2024-11-26T05:42:34","guid":{"rendered":"https:\/\/fwq.ai\/blog\/37633\/"},"modified":"2024-11-26T13:42:34","modified_gmt":"2024-11-26T05:42:34","slug":"java%e5%8f%8d%e5%9b%9e%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e8%b0%83","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/37633\/","title":{"rendered":"java\u53cd\u56de\u6570\u7ec4\u600e\u4e48\u8c03"},"content":{"rendered":"<blockquote><p>\n  \u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u6cd5\u8fd4\u56de java \u6570\u7ec4\uff1a\u4f7f\u7528\u6570\u7ec4\u7c7b\u578b\u76f4\u63a5\u8fd4\u56de\u6570\u7ec4\u3002\u4f7f\u7528\u6cdb\u578b\u5b9a\u4e49\u901a\u7528\u8fd4\u56de\u7c7b\u578b\uff0c\u63a5\u53d7\u5e76\u8fd4\u56de\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111308062322267.jpg\" class=\"aligncenter\" title=\"java\u53cd\u56de\u6570\u7ec4\u600e\u4e48\u8c03\u63d2\u56fe\" alt=\"java\u53cd\u56de\u6570\u7ec4\u600e\u4e48\u8c03\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 Java \u8fd4\u56de\u6570\u7ec4<\/strong><\/p>\n<p>\u5728 Java \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6570\u7ec4\u6765\u5b58\u50a8\u548c\u5904\u7406\u591a\u4e2a\u503c\u3002\u8fd4\u56de\u6570\u7ec4\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\u4e24\u79cd\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528\u6570\u7ec4\u7c7b\u578b<\/strong><\/p>\n<p>\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u76f4\u63a5\u8fd4\u56de\u6570\u7ec4\u7c7b\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>public int[] getArray() {\n    return new int[]{1, 2, 3};\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528\u6cdb\u578b<\/strong><\/p>\n<p>\u5bf9\u4e8e\u901a\u7528\u6027\u66f4\u9ad8\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6cdb\u578b\u6765\u5b9a\u4e49\u8fd4\u56de\u7c7b\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>public &lt;T&gt; T[] getArray(T[] array) {\n    return array;\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u63a5\u53d7\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u8fd4\u56de\u76f8\u540c\u7c7b\u578b\u7684\u6570\u7ec4\u3002<\/p>\n<p><strong>\u4f7f\u7528\u65b9\u6cd5<\/strong><\/p>\n<p>\u4e0a\u8ff0\u65b9\u6cd5\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528\u83b7\u5f97\u8fd4\u56de\u7684\u6570\u7ec4\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>int[] myArray = getArray();<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<ul>\n<li>\u8fd4\u56de\u6570\u7ec4\u65f6\uff0c\u5fc5\u987b\u786e\u4fdd\u6570\u7ec4\u4e2d\u5305\u542b\u6709\u6548\u503c\uff0c\u5426\u5219\u53ef\u80fd\u5bfc\u81f4 NullPointerException\u3002<\/li>\n<li>\u5982\u679c\u9700\u8981\u8fd4\u56de\u4e00\u4e2a null \u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528 null \u6765\u8868\u793a\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u53cd\u56de\u6570\u7ec4\u600e\u4e48\u8c03\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>\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u6cd5\u8fd4\u56de java \u6570\u7ec4\uff1a\u4f7f\u7528\u6570\u7ec4\u7c7b\u578b\u76f4\u63a5\u8fd4\u56de\u6570\u7ec4\u3002\u4f7f\u7528\u6cdb\u578b\u5b9a\u4e49\u901a\u7528\u8fd4\u56de\u7c7b\u578b\uff0c\u63a5\u53d7\u5e76\u8fd4\u56de\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\u3002 \u5982\u4f55\u4f7f\u7528 Java \u8fd4\u56de\u6570\u7ec4 \u5728 Java \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6570\u7ec4\u6765\u5b58\u50a8\u548c\u5904\u7406\u591a\u4e2a\u503c\u3002\u8fd4\u56de\u6570\u7ec4\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\u4e24\u79cd\uff1a 1. \u4f7f\u7528\u6570\u7ec4\u7c7b\u578b \u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u76f4\u63a5\u8fd4\u56de\u6570\u7ec4\u7c7b\u578b\u3002\u4f8b\u5982\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b public int[] getArray() { return new int[]{1, 2, 3}; } \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528\u6cdb\u578b \u5bf9\u4e8e\u901a\u7528\u6027\u66f4\u9ad8\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6cdb\u578b\u6765\u5b9a\u4e49\u8fd4\u56de\u7c7b\u578b\u3002\u4f8b\u5982\uff1a public &lt;T&gt; T[] getArray(T[] array) { return array; } \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u63a5\u53d7\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u8fd4\u56de\u76f8\u540c\u7c7b\u578b\u7684\u6570\u7ec4\u3002 \u4f7f\u7528\u65b9\u6cd5 \u4e0a\u8ff0\u65b9\u6cd5\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528\u83b7\u5f97\u8fd4\u56de\u7684\u6570\u7ec4\u3002\u4f8b\u5982\uff1a int[] myArray = getArray(); \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\u4e8b\u9879 \u8fd4\u56de\u6570\u7ec4\u65f6\uff0c\u5fc5\u987b\u786e\u4fdd\u6570\u7ec4\u4e2d\u5305\u542b\u6709\u6548\u503c\uff0c\u5426\u5219\u53ef\u80fd\u5bfc\u81f4 NullPointerException\u3002 \u5982\u679c\u9700\u8981\u8fd4\u56de\u4e00\u4e2a null \u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528 null \u6765\u8868\u793a\u3002 \u4ee5\u4e0a\u5c31\u662fjava\u53cd\u56de\u6570\u7ec4\u600e\u4e48\u8c03\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-37633","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37633","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=37633"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37633\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=37633"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=37633"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=37633"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}