{"id":39069,"date":"2024-11-26T12:58:12","date_gmt":"2024-11-26T04:58:12","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39069\/"},"modified":"2024-11-26T12:58:12","modified_gmt":"2024-11-26T04:58:12","slug":"java%e6%80%8e%e4%b9%88%e8%bf%94%e5%9b%9e%e4%b8%8d%e5%90%8c%e7%b1%bb%e5%9e%8b%e7%9a%84%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39069\/","title":{"rendered":"java\u600e\u4e48\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4"},"content":{"rendered":"<blockquote><p>\n  java \u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u6570\u7ec4\u7684\u65b9\u6cd5\uff1a\u4f7f\u7528\u901a\u914d\u7b26 &#8220;?&#8221; \u521b\u5efa\u901a\u7528\u6570\u7ec4\uff0c\u6307\u5b9a\u6240\u9700\u7c7b\u578b\u3002\u4f7f\u7528 java.lang.reflect.array \u7c7b\u521b\u5efa\u5404\u79cd\u7c7b\u578b\u7684\u6570\u7ec4\u3002\u4f7f\u7528\u6cdb\u578b\u6570\u7ec4\u521b\u5efa\u5177\u6709\u7279\u5b9a\u7c7b\u578b\u5143\u7d20\u7684\u6570\u7ec4\u3002\u4f7f\u7528 object[] \u6570\u7ec4\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u5bf9\u8c61\uff0c\u6309\u9700\u5f3a\u5236\u8f6c\u6362\u4e3a\u6240\u9700\u7c7b\u578b\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111603394326862.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4\u63d2\u56fe\" alt=\"java\u600e\u4e48\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 Java \u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4<\/strong><\/p>\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4ece Java \u65b9\u6cd5\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4\u3002\u4ee5\u4e0b\u662f\u5b9e\u73b0\u6b64\u76ee\u7684\u7684\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528\u901a\u914d\u7b26<\/strong><\/p>\n<p>\u901a\u914d\u7b26 &#8220;?&#8221; \u5141\u8bb8\u60a8\u6307\u5b9a\u4e00\u4e2a\u901a\u7528\u7684\u6570\u636e\u7c7b\u578b\uff0c\u8be5\u7c7b\u578b\u53ef\u4ee5\u63a5\u53d7\u4efb\u4f55\u7c7b\u578b\u7684\u503c\uff0c\u5305\u62ec\u6570\u7ec4\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>public static &lt;T&gt; T[] createArray(Class&lt;T&gt; clazz, int size) {\n    return (T[]) Array.newInstance(clazz, size);\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4e0a\u9762\u793a\u4f8b\u4e2d\u7684 createArray() \u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u901a\u8fc7\u6307\u5b9a clazz \u53c2\u6570\u6307\u5b9a\u6240\u9700\u7684\u7c7b\u578b\u3002<\/p>\n<p><strong>2. \u4f7f\u7528 java.lang.reflect.Array<\/strong><\/p>\n<p>java.lang.reflect.Array \u7c7b\u63d0\u4f9b\u4e86\u521b\u5efa\u548c\u64cd\u4f5c\u6570\u7ec4\u7684\u673a\u5236\u3002\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u4f7f\u7528 newArray() \u65b9\u6cd5\u521b\u5efa\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4\uff1a<\/p>\n<pre>double[] doubleArray = (double[]) Array.newInstance(double.class, 10);\nint[] intArray = (int[]) Array.newInstance(int.class, 5);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. \u4f7f\u7528\u6cdb\u578b\u6570\u7ec4<\/strong><\/p>\n<p>Java 5 \u5f15\u5165\u4e86\u6cdb\u578b\u6570\u7ec4\uff0c\u5141\u8bb8\u60a8\u521b\u5efa\u5177\u6709\u7279\u5b9a\u7c7b\u578b\u5143\u7d20\u7684\u6570\u7ec4\u3002\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u521b\u5efa\u6cdb\u578b\u6570\u7ec4\uff1a<\/p>\n<pre>String[] stringArray = new String[10];\nInteger[] integerArray = new Integer[5];<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>4. \u4f7f\u7528\u5bf9\u8c61\u6570\u7ec4<\/strong><\/p>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528 Object[] \u6570\u7ec4\u6765\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u7136\u540e\u6839\u636e\u9700\u8981\u5c06\u5176\u5f3a\u5236\u8f6c\u6362\u4e3a\u6240\u9700\u7c7b\u578b\u3002\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86\u6b64\u65b9\u6cd5\uff1a<\/p>\n<pre>Object[] objectArray = new Object[3];\nobjectArray[0] = \"String\";\nobjectArray[1] = 10;\nobjectArray[2] = true;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8bf7\u6ce8\u610f\uff0c\u5bf9\u4e8e Java \u6cdb\u578b\u6570\u7ec4\uff0c\u4e0d\u80fd\u5c06\u5b50\u7c7b\u578b\u6570\u7ec4\u5206\u914d\u7ed9\u7236\u7c7b\u578b\u6570\u7ec4\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4\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 \u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u6570\u7ec4\u7684\u65b9\u6cd5\uff1a\u4f7f\u7528\u901a\u914d\u7b26 &#8220;?&#8221; \u521b\u5efa\u901a\u7528\u6570\u7ec4\uff0c\u6307\u5b9a\u6240\u9700\u7c7b\u578b\u3002\u4f7f\u7528 java.lang.reflect.array \u7c7b\u521b\u5efa\u5404\u79cd\u7c7b\u578b\u7684\u6570\u7ec4\u3002\u4f7f\u7528\u6cdb\u578b\u6570\u7ec4\u521b\u5efa\u5177\u6709\u7279\u5b9a\u7c7b\u578b\u5143\u7d20\u7684\u6570\u7ec4\u3002\u4f7f\u7528 object[] \u6570\u7ec4\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u5bf9\u8c61\uff0c\u6309\u9700\u5f3a\u5236\u8f6c\u6362\u4e3a\u6240\u9700\u7c7b\u578b\u3002 \u5982\u4f55\u4f7f\u7528 Java \u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4 \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4ece Java \u65b9\u6cd5\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4\u3002\u4ee5\u4e0b\u662f\u5b9e\u73b0\u6b64\u76ee\u7684\u7684\u51e0\u79cd\u65b9\u6cd5\uff1a 1. \u4f7f\u7528\u901a\u914d\u7b26 \u901a\u914d\u7b26 &#8220;?&#8221; \u5141\u8bb8\u60a8\u6307\u5b9a\u4e00\u4e2a\u901a\u7528\u7684\u6570\u636e\u7c7b\u578b\uff0c\u8be5\u7c7b\u578b\u53ef\u4ee5\u63a5\u53d7\u4efb\u4f55\u7c7b\u578b\u7684\u503c\uff0c\u5305\u62ec\u6570\u7ec4\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b public static &lt;T&gt; T[] createArray(Class&lt;T&gt; clazz, int size) { return (T[]) Array.newInstance(clazz, size); } \u767b\u5f55\u540e\u590d\u5236 \u4e0a\u9762\u793a\u4f8b\u4e2d\u7684 createArray() \u65b9\u6cd5\u53ef\u4ee5\u8fd4\u56de\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u901a\u8fc7\u6307\u5b9a clazz \u53c2\u6570\u6307\u5b9a\u6240\u9700\u7684\u7c7b\u578b\u3002 2. \u4f7f\u7528 java.lang.reflect.Array java.lang.reflect.Array \u7c7b\u63d0\u4f9b\u4e86\u521b\u5efa\u548c\u64cd\u4f5c\u6570\u7ec4\u7684\u673a\u5236\u3002\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u4f7f\u7528 newArray() \u65b9\u6cd5\u521b\u5efa\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u7ec4\uff1a double[] doubleArray = (double[]) Array.newInstance(double.class, 10); int[] intArray [&hellip;]<\/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-39069","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39069","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=39069"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39069\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}