Application of the reflector - to modify property values

 

 

public  class Test3 {
     / * 
     * public void setProperity (Object obj, String name, Object value) 
     * This method may be called properityName attribute value of the object obj was changed value 
     * / 
    public  static  void main (String [] args) throws Exception { 
        Student S = new new Student ( "Joe Smith", 23 is ); 
        System.out.println (S); 
        Tool T = new new Tool (); 
        t.setProperity (S, "name", "John Doe" ); 
        System.out.println (S); 
    } 

}

import java.lang.reflect.Field;

public class Tool {
    public void setProperity(Object obj,String name, Object value) throws Exception{
        Class clazz = obj.getClass();
        Field f = clazz.getDeclaredField(name);
        f.setAccessible(true);        //取出权限
        f.set(obj, value);
    }
}