多线程的同步

多线程的同步

多线程同步可以使用synchronized关键字实现
当synchronized关键字修饰一个方法时，就叫同步方法
当synchronized方法执行完或发生异常，会自动释放锁

package com.cs;

public class Test {
	public static void main(String[] args) {
		DinnerWindows d = new DinnerWindows();
		d.setName("一号窗口：");
		DinnerWindows w = new DinnerWindows();
		w.setName("二号窗口：");
		d.start();
		w.start();
	}

}

package com.cs;

public class DinnerWindows extends Thread{
	
	private static int count =50;

	public void run(){
		sell();
	}
	synchronized public void sell(){
		while (count>0) {
			count--;
			System.out.println("当前窗口："+Thread.currentThread().getName()+"剩余："+count+"份");
		}
		try {
			Thread.sleep(20);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}