import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;

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

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

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

class Producer extends Thread {
   private Monitor monitor;
   private int number;
   private Test5Frame test;

   public Producer(Monitor c, int number, Test5Frame tst) {
      monitor = c;
      this.number = number;
      test = tst;
   }

   public void run() {
      for (int i = 0; i < 10; i++) {
         monitor.put(i);
         test.text.append("Producer #" + this.number + " put: " + i+"\n");
      }
   }
}

class Consumer extends Thread {
   private Monitor monitor;
   private int number;
   private Test5Frame test;

   public Consumer(Monitor c, int number, Test5Frame tst) {
      monitor = c;
      this.number = number;
      test = tst;
   }

   public void run() {
      int value = 0;
      for (int i = 0; i < 10; i++) {
         value = monitor.get();
         test.text.append("Consumer #" + this.number + " got: " + value+"\n");
      }
   }
}

class Test5Frame extends JFrame implements ActionListener {
   JTextArea text;
   JButton go;

   public Test5Frame () {
      setLayout(new BorderLayout());
      add("Center", new JScrollPane(text = new JTextArea()));
      add("South",go = new JButton("Press Me"));
      go.addActionListener(this);
      text.setFont(new Font("TimesRoman", Font.PLAIN, 18));
   }

   public void actionPerformed (ActionEvent evt) {
      text.setText("");

      Monitor monitor = new Monitor();
      Producer p1 = new Producer(monitor, 1, this);
      Consumer c1 = new Consumer(monitor, 1, this);
      p1.start();
      c1.start();
   }
}

public class Test5 extends Applet {
   public void init () {
      Test5Frame test = new Test5Frame();
      test.setSize(350,700);
      test.setVisible(true);
   }
}