Thread Race Applet
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import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JApplet;
import javax.swing.JPanel;
public class RaceApplet extends JApplet 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());
setContentPane(new AppletContentPane());
}
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 run() {
Thread myThread = Thread.currentThread();
while (updateThread == myThread) {
repaint();
try {
Thread.sleep(3);
} 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;
}
class AppletContentPane extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.white);
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);
}
for (int i = 0; i < NUMRUNNERS; i++) {
g.drawLine(SPACING, (i + 1) * SPACING, SPACING
+ (runners[i].tick) / 23000, (i + 1) * SPACING);
}
}
}
}
class Runner extends Thread {
public int tick = 1;
public void run() {
while (tick < 10000000)
tick++;
}
}
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