Consumer/Producer

class ProducerConsumerTest
{
    public static void main(String[] args)
    {
        CubbyHole c = new CubbyHole();
        Producer p1 = new Producer(c, 1);
        Consumer c1 = new Consumer(c, 1);

        p1.start();
        c1.start();
    }
}

class CubbyHole
{
    private int contents;         // this is the condition variable.
    private boolean available = false;

    public synchronized int get()
    {
        while (available == false)
        {
            try
            {
                wait();
            }
            catch (InterruptedException e) { }
        }
        available = false;
        notify();
        return contents;
    }

    public synchronized void put(int value)
    {
        while (available == true)
        {
            try
            {
                wait();
            }
            catch (InterruptedException e) { }
        }
        contents = value;
        available = true;
        notify();
    }
}

class Consumer extends Thread
{
    private CubbyHole cubbyhole;
    private int number;

    public Consumer(CubbyHole c, int number)
    {
        cubbyhole = c;
        this.number = number;
    }

    public void run()
    {
        int value = 0;
        for (int i = 0; i < 10; i++)
        {
            value = cubbyhole.get();
            System.out.println("Consumer #" + this.number + " got: " + value);
        }
    }
}

class Producer extends Thread
{
    private CubbyHole cubbyhole;
    private int number;

    public Producer(CubbyHole c, int number)
    {
        cubbyhole = c;
        this.number = number;
    }

    public void run()
    {
        for (int i = 0; i < 10; i++)
        {
            cubbyhole.put(i);
            System.out.println("Producer #" + this.number + " put: " + i);
            try
            {
                sleep((int)(Math.random() * 100));
            }
            catch (InterruptedException e) { }
        }
    }
}