谁能帮我修改一下，谢谢

shdxu 2007-06-12 12:22:05

代码如下，编译出现提示，但能通过，运行出现错误
package playgame;

import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

interface CharacterSource{
public void addCharacterListener(CharacterListener cl);
public void removeCharacterListener(CharacterListener cl);
public void nextCharacter();
}

interface CharacterListener{
public void newCharacter(CharacterEvent ce);
}

class CharacterEvent{
public CharacterSource source;
public int character;
public CharacterEvent(CharacterSource cs,int c){
source=cs;
character=c;
}
}

class CharacterEventHandler{
private Vector listeners=new Vector();

public void addCharacterListener(CharacterListener cl){
listeners.add(cl);
}

public void removeCharacterListener(CharacterListener cl){
listeners.remove(cl);
}

public void fireNewCharacter(CharacterSource source,int c){
CharacterEvent ce=new CharacterEvent(source,c);
CharacterListener[] cl=(CharacterListener[] )listeners.toArray(new CharacterListener[0]);
for(int i=0;i<cl.length;i++){
cl[i].newCharacter(ce);
}
}
}

class CharacterDisplayCanvas extends JComponent implements CharacterListener{
protected FontMetrics fm;
protected char[] tmpChar=new char[1];
protected int fontHeight;

public CharacterDisplayCanvas(){
setFont(new Font("Monospaced",Font.BOLD,18));
fm=Toolkit.getDefaultToolkit().getFontMetrics(getFont());
fontHeight=fm.getHeight();
}

public CharacterDisplayCanvas(CharacterSource cs){
this();
setCharacterSource(cs);
}

public void setCharacterSource(CharacterSource cs){
cs.addCharacterListener(this);
}

public Dimension preferredsize(){
return new Dimension(fm.getMaxAscent()+10,fm.getMaxAdvance()+10);
}

public synchronized void newCharacter(CharacterEvent ce){
tmpChar[0]=(char)ce.character;
repaint();
}

protected synchronized void paintComponent(Graphics gc){
Dimension d=getSize();
gc.clearRect(0,0,d.width,d.height);
if(tmpChar[0]==0)return;
int charWidth=fm.charWidth((int)tmpChar[0]);
gc.drawChars(tmpChar,0,1,(d.width-charWidth)/2,fontHeight);
}
}

class RandomCharacterGenerator extends Thread implements CharacterSource{
static char[] chars;
static String charArray="abcdefghijklmnopqrstuvwxyz";
static{
chars=charArray.toCharArray();
}

Random random;
CharacterEventHandler handler;

public RandomCharacterGenerator(){
random=new Random();
handler=new CharacterEventHandler();
}

public int getPauseTime(){
return (int)(Math.max(1000,5000*random.nextDouble()));
}

public void addCharacterListener(CharacterListener cl){
handler.addCharacterListener(cl);
}

public void removeCharacterListener(CharacterListener cl){
handler.removeCharacterListener(cl);
}

public void nextCharacter(){
handler.fireNewCharacter(this,(int)chars[random.nextInt(chars.length)]);
}

public void run(){
for(;;){
nextCharacter();
try{
Thread.sleep(getPauseTime());
}catch(InterruptedException ie){
return;
}
}
}
}

public class SwingTypeTester extends JFrame implements CharacterSource{
protected RandomCharacterGenerator producer;
private CharacterDisplayCanvas displayCanvas;
private CharacterDisplayCanvas feedbackCanvas;
private JButton quitButton;
private JButton startButton;
private CharacterEventHandler handler;

public SwingTypeTester(){
initComponents();
}

private void initComponents(){
handler=new CharacterEventHandler();
displayCanvas=new CharacterDisplayCanvas();
feedbackCanvas=new CharacterDisplayCanvas(this);
quitButton =new JButton();
startButton=new JButton();
add(feedbackCanvas,BorderLayout.CENTER);
add(displayCanvas,BorderLayout.NORTH);
JPanel p=new JPanel();
startButton.setLabel("start");
quitButton.setLabel("Quit");
p.add(startButton);
p.add(quitButton);

add(p,BorderLayout.SOUTH);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent evt){
quit();
}
});

feedbackCanvas.addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent ke){
char c=ke.getKeyChar();
if(c!=KeyEvent.CHAR_UNDEFINED)newCharacter((int)c);
}
});
startButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
producer=new RandomCharacterGenerator();
displayCanvas.setCharacterSource(producer);
producer.start();
startButton.setEnabled(false);
feedbackCanvas.setEnabled(true);
feedbackCanvas.requestFocus();
}
});
quitButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
quit();
}
});
pack();
}
private void quit(){
System.exit(0);
}

public void addCharacterListener(CharacterListener cl){
handler.addCharacterListener(cl);
}

public void removeCharacterListener(CharacterListener cl){
handler.removeCharacterListener(cl);
}

public void newCharacter(int c){
handler.fireNewCharacter(this,c);
}

public void nextCharacter(){
throw new IllegalStateException("We don't produce on demand");
}

public static void main(String args[]){
new SwingTypeTester().show();
}
}

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