【转载】JAVA利用反射机制访问private成员和方法

原文地址：http://lyg5623.blog.163.com/blog/static/53274011201002733119771/

class Normal {

    private String ss="ddd";

    private void ga(int i){

        System.out.println("ga!!"+i);

    }

}

 

public class Privateclassaccess {

    public static void main(String[]args) throws ClassNotFoundException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException, NoSuchMethodException, InvocationTargetException{

        Field field=Class.forName("Normal").getDeclaredField("ss");

        field.setAccessible(true);

        Normal n=new Normal();

        System.out.println(field.getType().toString());

        System.out.println(field.getName());

        System.out.println(field.getModifiers());

        Object s=field.get(n);

        System.out.println(s);

        String x="omg";

        field.set(n, x);

        System.out.println(field.get(n));

        Method method=Class.forName("Normal").getDeclaredMethod("ga", new Class[]{int.class});

        method.setAccessible(true);

        method.invoke(n, 3);

    }

}

输出：

class java.lang.String

ss

2

ddd

omg

ga!!3