//Listing 3-1. The Producer-Consumer Relationship Version 1

public class PC

{

    public static void main(String[] args)

    {

        Shared s = new Shared();

        new Producer(s).start();

        new Consumer(s).start();

    }

}

class Shared

{

    private char c;

    private volatile boolean writeable = true;

    synchronized void setSharedChar(char c)

    {

        while (!writeable)

        try

        {

         wait();

        }

        catch (InterruptedException ie)

        {

        }

        this.c = c;

        writeable = false;

        notify();

    }

    synchronized char getSharedChar()

    {

        while (writeable)

        try

        {

         wait();

        }

        catch (InterruptedException ie)

        {

        }

        writeable = true;

        notify();

        return c;

    }

}

class Producer extends Thread

{

    private final Shared s;

    Producer(Shared s)

    {

     this.s = s;

    }

    @Override

    public void run()

    {

        for (char ch = 'A'; ch <= 'Z'; ch++)

        {

            s.setSharedChar(ch);

            System.out.println(ch + " produced by producer.");

        }

    }

}

class Consumer extends Thread

{

    private final Shared s;

    Consumer(Shared s)

    {

     this.s = s;

    }

    @Override

    public void run()

    {

        char ch;

        do

        {

            ch = s.getSharedChar();

            System.out.println(ch + " consumed by consumer.");

        }

        while (ch != 'Z');

    }

}