// add Thread priorities
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class NewFrame extends JFrame {
    
    // For drawing the race results. 
    JPanel drawingArea;
    
    public NewFrame ()  {
        // Frame properties. 
        this.setTitle ("Dog Race");
        this.setResizable (true);
        this.setSize (600,200);

        Container cPane = this.getContentPane();
        cPane.setLayout (new BorderLayout()); 

        // Quit button. 
        JPanel p = new JPanel ();
        JButton quitb = new JButton ("QUIT");
        quitb.addActionListener 
            (new ActionListener () {
                    public void actionPerformed (ActionEvent a)
                    {
                        System.exit (0);
                    }
                }
             );
        p.add (quitb);
        
        // Pressing "start" calls race() 
        JButton startb = new JButton ("START");
        startb.addActionListener 
            (new ActionListener () {
                    public void actionPerformed (ActionEvent a)
                    {
                        race ();
                    }
                }
             );
        p.add (startb);
        
        // Now add the panel to the frame. 
        cPane.add (p, BorderLayout.SOUTH);
        
        // A JPanel to draw the results. 
        drawingArea = new JPanel();
        drawingArea.setBackground (Color.white);
        cPane.add (drawingArea, BorderLayout.CENTER);
        
        this.setVisible (true);
    }


    void race () {
        // Create two dog instances with different ID's. 
        Dog d1 = new Dog (1, drawingArea, 3, 6, this);
        Dog d2 = new Dog (2, drawingArea, 3, 6, this);
        Dog.startRace();
        d1.setPriority(Thread.NORM_PRIORITY);
        d2.setPriority(Thread.NORM_PRIORITY+3);
        d1.start();
        d2.start(); 
    }    
}


class Dog extends Thread {
    
    public int position = 20;  // Starting position. 
    int ID;                    // An ID. 
    JPanel drawingArea;        // The panel on which to draw. 
    int minNap, maxNap;
    NewFrame f;
    static boolean over;

    public Dog (int ID, JPanel drawingArea, int min, int max, NewFrame f)
    {
        this.f = f;
        minNap = min;
        maxNap = max;
        this.ID = ID;
        this.drawingArea = drawingArea;
        
        // Draw ID on panel. 
        Graphics g = drawingArea.getGraphics ();
        g.drawString (""+ID, 5, 20*ID+8);
    }
    
    public static void startRace() {
        over = false;
    }

    public void nap() {
            try {
                Thread.sleep (minNap + (int)(Math.random()*(maxNap-minNap)));
            }
            catch (InterruptedException e) {
                System.out.println (e);
            }
    }
    public void move ()
    {
        // Move a random amount. 
        int newPosition = position + (int) (50 + 50*Math.random());
        
        // Draw new position. 
        Graphics g = drawingArea.getGraphics ();
        int size = newPosition - position;
        g.fillRect (position, 20*ID, size, 10);
        position = newPosition;
    }
    // Must implement run() to satisfy Runnable interface
    public void run () {
        // Compute the finish line distance. 
        int finishLine = drawingArea.getSize().width;
        
        // While not complete... 
        while ((position < finishLine) && !raceFinished(false, ID)) {
            nap();
            move ();
        }
        if (position >= finishLine) raceFinished(true, ID);
    }
    public boolean raceFinished(boolean set, int caller) {
        if (set) over = true;
        return over;
    }
}

public class Race5 {
    public static void main (String[] argv)
    {
        NewFrame nf = new NewFrame ();
    }
}