Java-Unsafe类（一）

import sun.misc.Unsafe; // Eclipse引入此行会出现错误提示, 解决方法: [方法](http://blog.csdn.net/fenglibing/article/details/17138079)

public class Test {
public static void main(String args[]) throws Exception{
Field f = Unsafe.class.getDeclaredField("theUnsafe");
f.settAccessible(true);
Unsafe unsafe = (Unsafe)f.get(null);

Player p = (Player)unsafe.allocateInstance(Player.class);

p.setAge(45);

unsafe.allocateMemory(0L);
unsafe.freeMemory(0L)l
unsafe.compareAndSwapInt(...);
}
}

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;}
}