线程的交互

class Calculator extends Thread {
	int total=0;

	public void run() {
		synchronized (this) {
			for (int i = 0; i < 101; i++) {
				total += i;
			}
			notifyAll();
		}	
		// 通知所有在此对象上等待的线程
		
	}
}

/**
 * 获取计算结果并输出
 * 
 * @author leizhimin 2008-9-20 11:15:22
 */
public class ReaderResult extends Thread {
	Calculator c;

	public ReaderResult(Calculator c) {
		this.c = c;
	}

	public void run() {
		synchronized (c) {
//			try {
//				System.out.println(Thread.currentThread() + "等待计算结果。。。");
//				c.wait();
//			} catch (InterruptedException e) {
//				e.printStackTrace();
//			}
//			System.out.println(Thread.currentThread() + "计算结果为：" + c.total);
			if(c.total==0){
				try {
					System.out.println(Thread.currentThread() + "等待计算结果。。。");
					c.wait();
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			System.out.println(Thread.currentThread() + "计算结果为：" + c.total);
		}
	}

	public static void main(String[] args) {
		Calculator calculator = new Calculator();
		
		// 启动三个线程，分别获取计算结果
		new ReaderResult(calculator).start();
		new ReaderResult(calculator).start();
		new ReaderResult(calculator).start();
		// 启动计算线程
		calculator.start();//有可能产生死等现象
	}
}