class Q{
	int n;
	boolean valueSet=false;
	synchronized int get(){
		if(!valueSet)
		try{
			wait();
		}
		catch(InterruptedException e){
			System.out.println("InterruptedException caught.");
		}
		System.out.println("Got: "+n);
		valueSet=false;
		notify();
		return n;
	}
	synchronized void put(int n){
		if(valueSet)
		try{
			wait();
		}
		catch(InterruptedException e){
			System.out.println("InterruptedException caugth.");
		}
		this.n=n;
		System.out.println("Put: "+n);
		valueSet=true;
		notify();
	}
}

class Producer implements Runnable{
	Q q;
	Producer(Q q){
		this.q=q;
		new Thread(this,"Producer").start();
	}
	public void run(){
		int i=0;
		while(true){
			q.put(i++);
		}
	}
}

class Consumer implements Runnable{
	Q q;
	Consumer(Q q){
		this.q=q;
		new Thread(this,"Consumer").start();
	}
	public void run(){
		while(true){
			q.get();
		}
	}
}

class PCFixed{
	public static void main(String args[]){
		Q q=new Q();
		new Producer(q);
		new Consumer(q);
		System.out.println("Press Control-C to stop."); 
	}
}