正确理解wait()和notify（）方法

最新推荐文章于 2025-05-12 09:00:00 发布

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本文介绍了使用Java的wait和notify方法实现线程间的通信，通过创建两个子类线程来展示多线程同步和互斥操作的过程。

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wait和notify是根类Object两个方法。任何类都可以调用该方法。

下面代码实现两个线程通信方式。来自《java程序员面试秘籍》

package myself;

public class Syn {

	public static void main(String[] args) {
		
		TwoPeople.ONE.start();
		TwoPeople.TWO.start();

	}

}
class TwoPeople extends Thread{
	private int i = 0;
	static Thread ONE = new TwoPeople(1);
	static Thread TWO = new TwoPeople(2);
	static Object washroom = new Object();
	private TwoPeople(int i)
	{
		this.i = i;
	}
	private void brush()
	{
		System.out.println("people"+i+" is brushing");
		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("people"+i+" has brushed");
	}
	private void release()
	{
		System.out.println("People "+i+" is releasing!");
		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("People "+i+" has released!");
	}
	@Override
	public void run() {
		//我们加锁的对象是washroom，而不是this对象。所以我们调用的是washroom.wait()和washroom.notify().

<span style="white-space:pre">		</span>//如果省去washroom.会抛出IllegalMonitorStateException。因为this对象上没有加锁。
		synchronized(washroom)
		{
			try{
				if(i==1)
				{
					brush();
					<strong><span style="color:#ff0000;">washroom.wait();</span></strong>//添加当前线程到washroom的等待集中
					release();
					<strong><span style="color:#ff0000;">washroom.notify()</span></strong>;
				}else{
					brush();
					<span style="color:#ff0000;"><strong>washroom.notify();
					washroom.wait();</strong></span>
					release();
				}
			}catch(InterruptedException e)
			{
				e.printStackTrace();
			}
		}
	}
}