syndemo.java

web 程序设计 jsp简单开发 java语言基础

package ch7.section7_5;

public class SynDemo {
	public static void main(String[] args) {
		MyThread2 m1 = new MyThread2();
		Thread t1 = new Thread(m1,"t1");  //根据m1创建两个子线程
		Thread t2 = new Thread(m1, "t2");
		t1.start();  //启动两个线程
		t2.start();
	}
}

class MyThread2 implements Runnable {
	private int shareData = 0;  //共享变量
	public synchronized void run() {
		Thread t = Thread.currentThread();
		for(int i=0; i<5; i++) {
			int copy = shareData;  //将共享变量复制一份到copy
			try {
				//休眠若干时间
				Thread.sleep((int)(Math.random() * 1000));
			} catch(InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("Thread-" + t.getName() + ": copy = " + copy
								+ "\tshareData = " + shareData);
			shareData ++;
		}
	}
}