线程lock condition使用

下面是具体例子，一直抛错，搞不懂应该怎么用了；求修改求思想
package com.sixth.exam;

import java.util.concurrent.locks.*;

public class T3{
public static void main(String[] args)
{

ReentrantLock lock=new ReentrantLock();
PrintThread pt=new PrintThread(lock);
Thread t=new Thread(pt);
t.start();
}
}
class PrintThread implements Runnable
{

ReentrantLock lock;
Condition condition;
PrintThread1 pt1;
Thread t1;
public PrintThread(ReentrantLock lock)
{
this.lock=lock;
condition=lock.newCondition();
pt1=new PrintThread1(lock);
t1=new Thread(pt1);
}
public void run()
{
t1.start();
for(int i=3;i>=0;i--)
{
System.out.println(i+"....");
if(i==1)
{
System.out.println("起床啦");
condition.signalAll();
}
}

}
}
class PrintThread1 implements Runnable
{
ReentrantLock lock;
Condition condition;
public PrintThread1(ReentrantLock lock)
{
this.lock=lock;
condition=lock.newCondition();
}
public void run()
{
try {
lock.newCondition().await();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("复活了~");
}
}