为什么我按ESC键，程序不退出？？
import java.awt.*;import java.awt.event.*;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.image.*;
import com.sun.j3d.utils.behaviors.mouse.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import javax.swing.JFrame;
public class tuxiang extends JFrame implements KeyListener
{
private boolean isRunning;
private ScreenManager screen;
private DisplayMode displayMode=new DisplayMode(800,600,16,0);
public void init()
{
screen=new ScreenManager();
screen.setFullScreen(displayMode,this);
Window window=screen.getFullScreenWindow();
window.addKeyListener(this);
isRunning=true;
}
public void stop()
{
isRunning=false;
}
public void loop()
{
int i=0;
while(isRunning)
{
i++;
System.out.println("执行了"+i+"秒");
try
{
Thread.sleep(1000);
}
catch(InterruptedException ex)
{
}
}
}
public void keyPressed(KeyEvent e)
{
if(e.getKeyCode()==KeyEvent.VK_ESCAPE)
{
stop();
}
}
public void keyReleased(KeyEvent e)
{
}
public void keyTyped(KeyEvent e)
{
}
public BranchGroup createSceneGraph()
{
BranchGroup objroot=new BranchGroup();
BoundingSphere bounds=new BoundingSphere(new Point3d(0.0,.0,.0),100.0);
Background bg=new Background(new Color3f(1.f,1.f,1.f));
bg.setApplicationBounds(bounds);
objroot.addChild(bg);
TransformGroup objTrans=new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objroot.addChild(objTrans);
DirectionalLight light=new DirectionalLight(
new Color3f(1.f,1.f,0.f),new Vector3f(0.f,1.f,-1.f));
light.setInfluencingBounds(bounds);
objroot.addChild(light);
Appearance ap=new Appearance();
Material mat=new Material();
mat.setDiffuseColor(new Color3f(3.f,2.f,1.f));
ap.setMaterial(mat);
objTrans.addChild(new Box(.2f,.2f,.2f,ap));
MouseRotate b=new MouseRotate();
b.setSchedulingBounds(bounds);
b.setTransformGroup(objTrans);
objroot.addChild(b);
objroot.compile();
return objroot;
}
public void run(DisplayMode displayMode)
{
try
{
init();
loop();
}
finally
{
screen.restoreScreen();
}
}
public tuxiang()
{
setLayout(new BorderLayout());
Canvas3D c=new Canvas3D(SimpleUniverse.getPreferredConfiguration());
add("Center",c);
SimpleUniverse u=new SimpleUniverse(c);
u.getViewingPlatform().setNominalViewingTransform();
BranchGroup scene=createSceneGraph();
u.addBranchGraph(scene);
}
public static void main(String arg[])
{
DisplayMode displayMode=new DisplayMode(
800,600,32,DisplayMode.REFRESH_RATE_UNKNOWN);
tuxiang t=new tuxiang();
t.run(displayMode);
}
}
