import java.awt.*;
import java.applet.*;
import Counter;

public class MultipleThreads extends Applet
{
	Counter thread1;
	Counter thread2;
	String displayStr;
	Font font;
	int position;

	public void init()
	{
		font = new Font("TimesRoman", Font.PLAIN, 72);
		setFont(font);
		displayStr = "";
		position = 120;
		thread1 = new Counter(this, true);
		thread2 = new Counter(this, false);
	}

	public void start()
	{
		if (thread1.isAlive()) thread1.resume(); else thread1.start();
		if (thread2.isAlive()) thread2.resume(); else thread2.start();
    }

	public void stop()
	{
		thread1.suspend();
		thread2.suspend();
	}

	public void destroy()
	{
		thread1.stop();
		thread2.stop();
	}

	public void paint(Graphics g)
	{
		g.drawString(displayStr, 50, position);
	}

	synchronized public void SetDisplayStr(String str, int pos)
	{
		displayStr = str;
		position = pos;
		repaint();
	}
}

public class Counter extends Thread
{
	MultipleThreads applet;
	boolean forward;
	int count;
	int increment;
	int end;
	int position;

	Counter(MultipleThreads applet, boolean forward)
	{
		this.applet = applet;
		this.forward = forward;
	}

	public void run()
	{
		InitCounter();
		DoCount();
	}

	protected void InitCounter()
	{
		if (forward)
		{
			count = 0;
			increment = 1;
			end = 1000;
			position = 120;
		}
		else
		{
			count = 1000;
			increment = -1;
			end = 0;
			position = 180;
		}
	}

	protected void DoCount()
	{

		while (count != end)
		{
			count = count + increment;
			String str = String.valueOf(count);
			applet.SetDisplayStr(str, position);

			try
			{
				sleep(100);
			}
			catch (InterruptedException e)
			{
			}
		}
	}

}