通過(guò)反射得到User類
Class name = Class.forName("com.hjj.User");//填全路徑
User user = (User) name.newInstance();//實(shí)例化得到User對(duì)象,原理是使用了User類的無(wú)參構(gòu)造函數(shù)
也可以使用有參構(gòu)造函數(shù)來(lái)實(shí)例化User對(duì)象
Class name = Class.forName("com.hjj.User");//填全路徑
Constructor constructor = name.getConstructor(String.class,Integer.class);//有參構(gòu)造函數(shù)對(duì)應(yīng)參數(shù)類型
User user=(User) constructor.newInstance("hjj",34);//有參構(gòu)造函數(shù)對(duì)應(yīng)參數(shù)賦值
