class QueueClass {
	int number;
	boolean valueset = false;


	synchronized int get( ) {
	if (valueset==false) 
 	   try {
		    wait( );
		}
	     catch (InterruptedException e) {
	               System.out.println("InterruptedException caught");
		}
	System.out.println( "Got: " + number);
	valueset = false;
	notify( );
	return number;
}


synchronized void put( int number) {
		if (valueset==true)
			try {
				wait( );
			}
			catch (InterruptedException e) {
				System.out.println("InterruptedException caught");
			}
		this.number = number;
		valueset = true;
		System.out.println( "Put: " + number);
		notify( );
	}

}

class Developer implements Runnable {
	QueueClass queueClass;

	Developer ( QueueClass queueClass) {
		this.queueClass = queueClass;
	}

	public void run( ) {
		int i = 0;
		for(int j=0; j<50; j++) {
			queueClass.put (i++);
		}
	}
}

class Client implements Runnable {
	QueueClass queueClass;
	
	Client (QueueClass queueClass) {
		this.queueClass = queueClass;
	}
	
	public void run( ) {
		for(int j=0; j<50; j++)  {
			queueClass.get( );
		}
	}

}
public class Caller2 {

	public static void main(String args[]) {
		QueueClass queueClass = new QueueClass( );
		Developer Dev = new Developer(queueClass);
		Client cl = new Client (queueClass);
		Thread t1=new Thread(Dev);
		Thread t2=new Thread(cl);
		t1.start();
		t2.start();
		System.out.println("Press Control-C to stop");
	}
}