{"id":99,"date":"2019-06-04T11:49:54","date_gmt":"2019-06-04T03:49:54","guid":{"rendered":"http:\/\/www.anthonylee.cn\/myblog\/?p=99"},"modified":"2019-06-14T11:49:54","modified_gmt":"2019-06-14T03:49:54","slug":"java%e5%8f%8d%e5%b0%84","status":"publish","type":"post","link":"http:\/\/www.anthonylee.cn\/myblog\/?p=99","title":{"rendered":"java\u53cd\u5c04"},"content":{"rendered":"

Java\u8ba9\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u8bc6\u522b\u5bf9\u8c61\u548c\u7c7b\u7684\u4fe1\u606f\uff0c\u4e3b\u8981\u67092\u79cd\u65b9\u5f0f\uff1a\u4e00\u79cd\u662f\u4f20\u7edf\u7684RTTI\uff0c\u5b83\u5047\u5b9a\u6211\u4eec\u5728\u7f16\u8bd1\u65f6\u5df2\u7ecf\u77e5\u9053\u4e86\u6240\u6709\u7684\u7c7b\u578b\u4fe1\u606f\uff1b\u53e6\u4e00\u79cd\u662f\u53cd\u5c04\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u53d1\u73b0\u548c\u4f7f\u7528\u7c7b\u7684\u4fe1\u606f\u3002<\/p>\n

 <\/p>\n

\u4e3a\u4ec0\u4e48\u8981\u7528\u53cd\u5c04<\/h2>\n
    \n
  1. \u5728\u4f20\u7edf\u65b9\u5f0f\u4e2d\u521b\u5efa\u5bf9\u8c61\u7684\u65b9\u6cd5\uff1anew<\/strong>\uff0c
    \n\u524d\u63d0\u662f\u5fc5\u987b\u77e5\u9053\u8981\u4f7f\u7528\u7684\u7c7b<\/em>\uff0c\u540c\u65f6\u5982\u679c\u8981\u4fee\u6539\u4f7f\u7528\u7684\u7c7b\uff0c\u5fc5\u987b\u4fee\u6539\u6e90\u7801\u3002<\/li>\n
  2. \u95ee\u9898\uff1a
    \n2.1\u5982\u679c\u65e0\u6cd5\u786e\u5b9a\u8981\u6267\u884c\u7684\u5bf9\u8c61\u600e\u4e48\u529e?
    \n2.2\u5982\u679c\u8981\u4fee\u6539\u4f7f\u7528\u7684\u7c7b,\u5fc5\u987b\u4fee\u6539\u6e90\u7801.\u8fd9\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u6781\u5176\u4e0d\u65b9\u4fbf\uff0c\u56e0\u4e3a\u5fc5\u987b\u91cd\u65b0\u5728\u670d\u52a1\u5668\u4e0a\u4e0a\u4f20\u9879\u76ee\u6587\u4ef6\u3002<\/li>\n
  3. \u95ee\u9898\u7684\u89e3\u51b3\uff1a\u4f7f\u7528\u53cd\u5c04\u3002<\/li>\n<\/ol>\n

    \u53cd\u5c04\u7684\u6982\u5ff5\u548c\u4f5c\u7528:<\/h2>\n

    1.\u53cd\u5c04\u7684\u6982\u5ff5: \u4e07\u4e8b\u4e07\u7269\u7686\u5bf9\u8c61,\u7c7b\u4e5f\u662f\u5bf9\u8c61.
    \n\u7c7b\u7684\u76f8\u540c\u7279\u5f81\u662f\u90fd\u5177\u6709\uff1a\u5c5e\u6027\uff0c\u65b9\u6cd5\uff0c\u6784\u9020\u5668<\/strong>\u00a0\u5728java\u4e2d\u6709\u4e00\u4e2a\u7c7bClass\uff0c\u8be5\u7c7b\u5c01\u5b58\u4e86\u4efb\u4f55\u4e00\u4e2a\u7c7b\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u5373Class\u5bf9\u8c61\u5b58\u50a8\u4e86\u4e00\u4e2a\u7c7b\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u901a\u8fc7Class\u5bf9\u8c61\u6765\u521b\u5efa\u76ee\u6807\u7c7b\u5bf9\u8c61<\/strong>
    \n\u56e0\u6b64\uff0c\u6211\u4eec\u901a\u8fc7\u53cd\u5c04\u521b\u5efa\u7c7b\u5bf9\u8c61\u548c\u4f7f\u7528\u7c7b\u5bf9\u8c61.
    \n2. \u53cd\u5c04\u7684\u4f5c\u7528:\u52a8\u6001\u521b\u5efa\u5bf9\u8c61\uff08\u5c31\u50cf\u4e00\u9762\u955c\u5b50\uff0c\u7167\u51fa\u4e86\u5176\u4ed6\u7c7b\u7684\u4fe1\u606f\u3002\uff09
    \n3. \u53cd\u5c04\u7684\u7f3a\u70b9\uff1a\u6548\u7387\u4f4e\uff0c\u5f71\u54cd\u7a0b\u5e8f\u6027\u80fd\u3002<\/p>\n

     <\/p>\n

    \u53cd\u5c04\u7684\u4f7f\u7528<\/h2>\n

    \u4e09\u79cd\u65b9\u5f0f<\/p>\n

     <\/p>\n

    1<\/p>\n

    Class.<\/span>forName<\/span>(<\/span>)<\/span>;<\/span>\/\/\u6839\u636e\u5168\u9650\u5b9a\u8def\u5f84\u83b7\u53d6\uff08\u5e38\u7528\uff09<\/span><\/p>\n

    Class cla01<\/span>=<\/span>Class.<\/span>forName<\/span>(<\/span>“com.dayunwu.pojo.Person”<\/span>)<\/span>;<\/span><\/p>\n

    2<\/p>\n

    \u5bf9\u8c61\u540d.<\/span>getClass<\/span>(<\/span>)<\/span>;<\/span>\/\/\u6839\u636e\u5bf9\u8c61\u83b7\u53d6\uff08\u6bd4\u8f83\u9e21\u808b\uff09<\/span><\/p>\n

    Class cla03<\/span>=<\/span>new<\/span> Person<\/span>(<\/span>)<\/span>.<\/span>getClass<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

     <\/p>\n

    3<\/p>\n

    \u7c7b\u540d.<\/span>class<\/span>\/\/\u6839\u636e\u7c7b\u540d\u83b7\u53d6`\uff08\u66f4\u9e21\u808b\uff0c\u6211\u90fd\u77e5\u9053\u4e86\u7c7b\u540d\u4e86\u8fd8\u7528\u53cd\u5c04\uff1f\uff09<\/span><\/p>\n

     <\/p>\n

    Class cla02<\/span>=<\/span>Person.<\/span>class<\/span>;<\/span><\/p>\n

     <\/p>\n

     <\/p>\n

    \u901a\u8fc7\u53cd\u5c04\u64cd\u4f5c\u5c5e\u6027<\/p>\n

     <\/p>\n

    <\/pre>\r\n<pre>\/\/\u83b7\u53d6\u7c7b\u5bf9\u8c61\r\nClass cla = Class.forName("com.dayunwu.pojo.Student");\r\n\/\/\u83b7\u53d6\u53cd\u5c04\u7c7b\u5c5e\u6027\r\n\/\/\u83b7\u53d6\u7c7b\u53ca\u5176\u7236\u7c7b\u7684\u516c\u5171\u5b57\u6bb5\r\nField[] fds = cla.getFields();\r\nfor (Field f : fds) {\r\n    System.out.println("\u83b7\u53d6\u5c5e\u6027\u540d------>" + f.getName());\r\n    System.out.println("\u83b7\u53d6\u4fee\u9970\u7b26------>" + f.getModifiers());\r\n    System.out.println("\u83b7\u53d6\u7c7b\u578b------>" + f.getType());\/\/\u8fd4\u56de\u7684\u662f\u7c7b\u578b\u7684Class\u5bf9\u8c61\r\n}\r\nSystem.out.println("******************************");\r\n\/\/\u83b7\u53d6\u7c7b\u58f0\u660e\u7684\u6240\u6709\u5b57\u6bb5\r\nField[] fds2 = cla.getDeclaredFields();\r\nfor (Field f : fds2) {\r\n    System.out.println("\u83b7\u53d6\u5c5e\u6027\u540d----->" + f.getName());\r\n    System.out.println("\u83b7\u53d6\u4fee\u9970\u7b26------>" + f.getModifiers());\r\n    System.out.println("\u83b7\u53d6\u7c7b\u578b------>" + f.getType());\/\/\u8fd4\u56de\u7684\u662f\u7c7b\u578b\u7684Class\u5bf9\u8c61\r\n}\r\nSystem.out.println("******************************");\r\n\/\/\u83b7\u53d6\u6307\u5b9a\u7684\u5b57\u6bb5\r\nField f = cla.getField("pname");\/\/\u6307\u5b9a\u83b7\u53d6\u7c7b\u53ca\u5176\u7236\u7c7b\u7684\u516c\u5171\u5b57\u6bb5\r\nSystem.out.println(f.getName());\r\nField f2 = cla.getDeclaredField("money");\/\/\u6307\u5b9a\u83b7\u53d6\u7c7b\u7684\u6240\u6709\u5b57\u6bb5\r\nSystem.out.println(f2.getName());\r\nField f3 = cla.getSuperclass().getDeclaredField("pname");\/\/\u6307\u5b9a\u83b7\u53d6\u7236\u7c7b\u58f0\u660e\u7684\u5b57\u6bb5\r\nSystem.out.println(f3.getName());\r\n\/\/\u64cd\u4f5c\u5b57\u6bb5\u503c\r\nSystem.out.println("************\u64cd\u4f5c\u9759\u6001\u5b57\u6bb5**********************");\r\n\/\/\u64cd\u4f5c\u9759\u6001\u5c5e\u6027\r\nField fs = cla.getDeclaredField("money");\r\nfs.set(null, 2000);\r\nSystem.out.println(fs.get(null));\r\nSystem.out.println("************\u64cd\u4f5c\u975e\u9759\u6001\u5b57\u6bb5**********************");\r\n\/\/\u64cd\u4f5c\u975e\u9759\u6001\u5c5e\u6027\r\nField fd = cla.getDeclaredField("sname");\r\nObject obj = cla.newInstance();\r\nfd.set(obj, "\u5f20\u4e09");\r\nSystem.out.println(fd.get(obj));\r\n\/\/\u53cd\u5c04\u64cd\u4f5c\u79c1\u6709\u5316\u5c5e\u6027\uff08\u66b4\u529b\uff09\r\nField fd2 = cla.getDeclaredField("ssex");\r\nfd2.setAccessible(true);\/\/\u66b4\u529b\u53cd\u5c04,\u64cd\u4f5c\u79c1\u6709\u5316\u5c5e\u6027,\u4e00\u822c\u4e0d\u4f7f\u7528\uff0c\u7834\u574f\u4e86\u5c01\u88c5\r\nObject obj2 = cla.newInstance();\/\/\u83b7\u53d6\u5b9e\u4f8b\u5316\u5bf9\u8c61\r\nSystem.out.println(fd2.get(obj2));<\/pre>\r\n<pre><\/pre>\n","protected":false},"excerpt":{"rendered":"
    Java\u8ba9\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u8bc6\u522b\u5bf9\u8c61\u548c\u7c7b\u7684\u4fe1\u606f\uff0c\u4e3b\u8981\u67092\u79cd\u65b9\u5f0f\uff1a\u4e00\u79cd\u662f\u4f20\u7edf\u7684RTTI\uff0c\u5b83\u5047\u5b9a\u6211\u4eec\u5728\u7f16\u8bd1\u65f6\u5df2… \u7ee7\u7eed\u9605\u8bfb java\u53cd\u5c04<\/span><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts\/99"}],"collection":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=99"}],"version-history":[{"count":2,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts\/99\/revisions"}],"predecessor-version":[{"id":101,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=\/wp\/v2\/posts\/99\/revisions\/101"}],"wp:attachment":[{"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=99"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=99"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.anthonylee.cn\/myblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=99"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}