为什么线程Thread1：11会被出现？

Question

package lesson07;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ThreadTest implements Runnable{
    
	

	int count=0;
	@Override
	public void run() {
		Lock lock=new ReentrantLock(true);
		//synchronized(ThreadTest.class){
		while(true)
		{
			lock.lock();
			if(count<=10)
			{
				try{
					Thread.sleep(100);
					
				}catch(Exception e)
				{
					e.printStackTrace();
				}
				System.out.println(Thread.currentThread().getName()+":"+count++);
			}
			lock.unlock();
		}
		//}
	}
	public static void main(String[] args) {
		ThreadTest T=new ThreadTest();
		Thread T1=new Thread(T);
		Thread T2=new Thread(T);
		T1.setName("Thread1");
		T2.setName("Thread2");
		T1.start();
		T2.start();
		

	}

}

 

Answer 1

lock局部变量，所以两个线程使用的就不是同一把锁。

 

改为 成员变量就可以了