synccounter2.java

java程序设计源代码

class SyncCounter2
{
	public static void main(String[] args){ 
		Num num = new Num();
		Thread counter1 = new Counter(num);
		Thread counter2 = new Counter(num);
		for( int i=0; i<10; i++ ){
			num.testEquals();
			try{							           
				Thread.sleep(100);
			}catch(InterruptedException e){
			}
		}
	}
}

class Num
{
	private int x=0;
	private int y=0;
	synchronized void increase(){ 
		x++; 
		y++; 
	}
	synchronized void testEquals(){
		System.out.println( x + "," + y +" ：" + (x==y));
	}
}

class Counter extends Thread
{
	private Num num;
	Counter( Num num ){
		this.num = num;
		this.start();
	}
	public void run(){
		while(true){
			num.increase();
		}
	}
}