IncorrectPC.java

class Q {
    int n;
    synchronized int get() {
        System.out.println("Got: " + n);
        return n;
    }

    synchronized void put(int n) {
        this.n = n;
        System.out.println("Put: " + n);
    }
}

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++);
            try {
                Thread.sleep(1000);
            } catch(InterruptedException e) {
                System.out.println("Interrupted");
            }
        }
    }
}

class Consumer implements Runnable {
    Q q;

    Consumer(Q q) {
        this.q = q;
        new Thread(this, "Consumer").start();
    }

    public void run() {
        while(true) {
            q.get();
        }
    }
}

public class IncorrectPC {
    public static void main(String[] args) {
        Q q = new Q();
        new Producer(q);
        new Consumer(q);

        System.out.println("Press Control-C to stop.");
    }
}