LockSupport.unpark 使用

import java.util.HashMap;

import java.util.Map;

import java.util.concurrent.locks.LockSupport;

class Runt implements Runnable{

int i=0;

public Runt(int i){

this.i=i;

}

@Override

public void run() {

// TODO Auto-generated method stub

synchronized (this) {

LockSupport.park();

System.out.println(Thread.holdsLock(this));//true 返回次对象是否持有锁

System.out.println("i is:"+i);

}

}

}

class ParkULock {

public static void main(String args[]) throws Exception {  

        //先调用下unpark  

       // LockSupport.unpark(Thread.currentThread());  

Map<Integer,Thread> map = new HashMap<Integer,Thread>();

for (int i=0;i < 10;i++){

Thread t1= new Thread(new Runt(i));

t1.start();

map.put(i, t1);

}

          

   LockSupport.unpark(map.get(2));

while(true){}

  

}  

}