通过反射访问私有方法

package com.dy.xidian;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

class A {
    private void a() {
        System.out.println("This is a function");
    }
}
public class TestReflect {
    public static void main(String[] args) throws NoSuchMethodException,
            SecurityException, IllegalAccessException,
            IllegalArgumentException, InvocationTargetException {
        A a = new A();
        Method g = a.getClass().getDeclaredMethod("a");
        g.setAccessible(true);
        g.invoke(a);
    }
}

通过反射机制可以访问A中的私有方法。