sun.misc.unsafe类的使用

学习了：http://blog.csdn.net/fenglibing/article/details/17138079

 真的可以创建private的实例：

package com.stono.test;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import sun.misc.Unsafe;public class UnsafeTest {    public static void main(String[] args) throws Exception{        Field f = Unsafe.class.getDeclaredField("theUnsafe");        f.setAccessible(true);        Unsafe unsafe = (Unsafe)f.get(null);                Player p = (Player)unsafe.allocateInstance(Player.class); // 这个猛，都不需要经过构造函数        System.out.println(p.getAge());        p.setAge(45);        System.out.println(p.getAge());                        Constructor
     
       constructor = Player.class.getDeclaredConstructor();        constructor.setAccessible(true);        Player s2 = constructor.newInstance(); // 通过反射可以创建对象，但是必须经过构造函数        System.out.println("reflect"+s2.getAge());    }}class Player{    private int age = 12;    private Player(){        this.age = 50;    }    public int getAge(){        return this.age;    }    public void setAge(int age){        this.age = age;    }}