import java.awt.*; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.applet.Applet; public class RaceApplet extends Applet implements Runnable { private final static int NUMRUNNERS = 2; private final static int SPACING = 20; private Runner[] runners = new Runner[NUMRUNNERS]; private Thread updateThread = null; public void init() { String raceType = getParameter("type"); for (int i = 0; i < NUMRUNNERS; i++) { runners[i] = new Runner(); if (raceType.compareTo("unfair") == 0) runners[i].setPriority(i+2); else runners[i].setPriority(2); } if (updateThread == null) { updateThread = new Thread(this, "Thread Race"); updateThread.setPriority(NUMRUNNERS+2); } addMouseListener(new MyAdapter()); } class MyAdapter extends MouseAdapter { public void mouseClicked(MouseEvent evt) { if (!updateThread.isAlive()) updateThread.start(); for (int i = 0; i < NUMRUNNERS; i++) { if (!runners[i].isAlive()) runners[i].start(); } } } public void paint(Graphics g) { g.setColor(Color.lightGray); g.fillRect(0, 0, getSize().width, getSize().height); g.setColor(Color.black); for (int i = 0; i < NUMRUNNERS; i++) { int pri = runners[i].getPriority(); g.drawString(new Integer(pri).toString(), 0, (i+1)*SPACING); } update(g); } public void update(Graphics g) { for (int i = 0; i < NUMRUNNERS; i++) { g.drawLine(SPACING, (i+1)*SPACING, SPACING + (runners[i].tick)/1000, (i+1)*SPACING); } } public void run() { Thread myThread = Thread.currentThread(); while (updateThread == myThread) { repaint(); try { Thread.sleep(10); } catch (InterruptedException e) { } } } public void stop() { for (int i = 0; i < NUMRUNNERS; i++) { if (runners[i].isAlive()) runners[i] = null; } if (updateThread.isAlive()) updateThread = null; } }