{"id":978,"date":"2021-02-23T15:36:00","date_gmt":"2021-02-23T07:36:00","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=978"},"modified":"2021-03-19T13:18:21","modified_gmt":"2021-03-19T05:18:21","slug":"%e5%8f%8d%e5%b0%84-%e4%b8%8e-class","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-978.html","title":{"rendered":"\u53cd\u5c04 \u4e0e Class"},"content":{"rendered":"\n<p>\u53cd\u5c04\uff0c\u662f\u5c06\u7c7b\u7684\u5404\u4e2a\u7ec4\u6210\u5bf9\u8c61\uff0c\u5c01\u88c5\u4e3a\u5176\u4ed6\u5bf9\u8c61\uff0c\u4ee5\u4fbf\u5728\u8fd0\u884c\u4e2d\u64cd\u4f5c\u8fd9\u4e9b\u5bf9\u8c61<\/p>\n\n\n\n<p>\u4f7f\u7528\u53cd\u5c04\u673a\u5236\uff0c\u53ef\u4ee5\u89e3\u8026\uff0c\u5e76\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6269\u5c55\u6027\uff0c\u8fd9\u4e5f\u662f\u6846\u67b6\u7684\u57fa\u7840\u4e4b\u4e00<\/p>\n\n\n\n<h5>1.\u83b7\u53d6 class \u5bf9\u8c61<\/h5>\n\n\n\n<p>\u6709 3 \u79cd\u65b9\u5f0f\u83b7\u53d6 class \u5bf9\u8c61\uff08java.lang.Class&lt;T&gt;)\uff0c\u4e09\u79cd\u83b7\u53d6\u7684\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/1.\u7b2c\u4e00\u79cd,\u628a\u7a0b\u5e8f\u52a0\u8f7d\u8fdb\u5185\u5b58\uff0c\u5e76\u8fd4\u56deClass\u5bf9\u8c61,\u591a\u7528\u4e8e\u52a0\u8f7d\u914d\u7f6e\u6587\u4ef6\nClass.forName(\"\u5168\u9650\u5b9a\u7c7b\u540d\"); \/\/\u5373\u5305\u540d.\u7c7b\u540d\n\/\/2.\u901a\u8fc7\u7c7b\u540d\u7684\u5c5e\u6027\u83b7\u53d6\uff0c\u591a\u7528\u4e8e\u53c2\u6570\u4f20\u9012\n\u7c7b\u540d.class\n\/\/3.\u901a\u8fc7\u5bf9\u8c61\u7684\u65b9\u6cd5getClass\u83b7\u53d6\uff0c\u591a\u7528\u4e8e\u5bf9\u8c61\u83b7\u53d6\u5b57\u8282\u7801\n\u5bf9\u8c61.getClass();<\/code><\/pre>\n\n\n\n<p>\u4efb\u4e00 java \u7684 class ,\u90fd\u53ef\u4ee5\u76f4\u63a5 getClass(); \u6216\u8005 this.getClass() \u5f97\u5230\u81ea\u8eab\u7684 Class \u5bf9\u8c61.<\/p>\n\n\n\n<h4 class=\"has-text-align-center\">2.Class \u5bf9\u8c61\u7684\u529f\u80fd<\/h4>\n\n\n\n<h5>1.\u83b7\u53d6\u6210\u5458\u53d8\u91cf Field \u5bf9\u8c61 \uff08java.lang.reflect.Field)<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>Class myClass = My.Class; \/\/\u5148\u83b7\u53d6\u4e00\u4e2a Class\nFiled&#91;] fields = myClass.getFields(); \/\/\u83b7\u53d6\u6240\u6709\u7684public\u6210\u5458\u53d8\u91cf\nfor(Field field : fields){\n  System.out.println(field);\n}\nField a = myClass.getField(\"a\"); \/\/\u83b7\u53d6\u4e00\u4e2apublic\u6210\u5458\u53d8\u91cf,\u53d8\u91cf\u540d\u4e3aa\n\/\/\u5982\u679c\u9700\u8981\u5bf9\u53d6\u53d8\u91cf\u503c\uff0c\u6216\u8bbe\u7f6e\u503c\uff0c\u53ea\u80fd\u8bbe\u7f6e\u67d0\u4e2a\u5bf9\u8c61\nMy my = new My();\nObject value = a.get(my);\/\/\u53d6\u503c\na.set(my,\"\u5f20\u4e09\"); \/\/\u8bbe\u7f6e\u503c\n\/\/\u5982\u679c\u9700\u8981\u83b7\u53d6\u6240\u6709\u6210\u5458\u53d8\u91cf\uff0cgetDeclareFields();\n\/\/\u6240\u6709\u53d8\u91cf\u79cd\u83b7\u53d6\u4e00\u4e2a\u6307\u5b9a\u7684\u6210\u5458\u53d8\u91cf\uff0cgetDeclareField(\"\u53d8\u91cf\u540d\");\n\/\/\u5bf9\u4e8e\u79c1\u6709\u53d8\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528 field.setAccessible(true); \u66b4\u529b\u53cd\u5c04<\/code><\/pre>\n\n\n\n<h5>2.\u83b7\u53d6\u6784\u9020\u5668 Constructor \u5bf9\u8c61\uff08java.lang.reflect.Constructor&lt;T&gt;)<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u83b7\u53d6\u4e00\u4e2a\u6784\u9020\u5668\u5bf9\u8c61\uff0c\u5982\u679c\u6709\u53c2\u6570\uff0c\u9700\u8981\u4f20\u9012\u53c2\u6570\u7c7b\u578b\u7684class\uff0cConstructors\u4e0d\u8bb2\nConstructor constructor = myClass.getConstructor(String.class,int.class);\n\/\/\u4f7f\u7528\u6784\u9020\u5668\u521b\u5efa\u5bf9\u8c61\nObject myObject = constructor.newInstance(\"\u5f20\u4e09\",\"23\");\n\/\/\u5bf9\u4e8e\u79c1\u6709\u7684\u5c5e\u6027\u7b49\uff0c\u9700\u8981\u7528getDeclareConstructor\uff0c\u4ee5\u53ca\u66b4\u529b\u53cd\u5c04\u7b49\n\/\/\u5bf9\u4e8e\u65e0\u53c2\u6784\u9020\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 Class.newInstance();<\/code><\/pre>\n\n\n\n<h5>3.\u83b7\u53d6\u65b9\u6cd5 Method \u5bf9\u8c61\uff08java.lang.reflect.Method)<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>Method met = myClass.getMethod(\"myMethod\"); \/\/\u83b7\u53d6\u6307\u5b9a\u7684\u65b9\u6cd5\uff0cMethods\u4e0d\u8bb2\n\/\/\u5bf9\u4e8e\u79c1\u6709\u65b9\u6cd5\uff0c\u7c7b\u4f3c\u6709 getDeclareMethod\uff0c\u66b4\u529b\u53cd\u5c04\u7b49\u4e5f\u4e0d\u8bb2\n\/\/\u9700\u8981\u6267\u884c\u65b9\u6cd5\uff0c\u5fc5\u987b new \u5bf9\u8c61\nmet.invoke(my); \/\/\u4f7f\u7528\u5bf9\u8c61\u6267\u884c\u65b9\u6cd5\n\/\/\u5bf9\u4e8e\u91cd\u8f7d\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6307\u5b9a\u53c2\u6570\nMethod met2 = myClass.getMethod(\"myMethod\",String.class);\nmet2.invoke(my,\"Java\u6559\u7a0b\");<\/code><\/pre>\n\n\n\n<h5>4.\u83b7\u53d6\u7c7b\u540d<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>my.getName(); \/\/\u8fd9\u4e2a\u7c7b\u540d\uff0c\u662f\u5168\u9650\u5b9a\u7c7b\u540d\uff0c\u5373\u5305\u540d.\u7c7b\u540d\nmy.getSimpleName();\/\/\u4ec5\u7c7b\u540d<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u53cd\u5c04\uff0c\u662f\u5c06\u7c7b\u7684\u5404\u4e2a\u7ec4\u6210\u5bf9\u8c61\uff0c\u5c01\u88c5\u4e3a\u5176\u4ed6\u5bf9\u8c61\uff0c\u4ee5\u4fbf\u5728\u8fd0\u884c\u4e2d\u64cd\u4f5c\u8fd9\u4e9b\u5bf9\u8c61 \u4f7f\u7528\u53cd\u5c04\u673a\u5236\uff0c\u53ef\u4ee5\u89e3\u8026\uff0c\u5e76\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6269\u5c55&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/java\/post-978.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">\u53cd\u5c04 \u4e0e Class<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[30],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/978"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=978"}],"version-history":[{"count":2,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/978\/revisions"}],"predecessor-version":[{"id":1191,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/978\/revisions\/1191"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}