我似乎无法重置我的游戏。
我想要发生的是一旦 numLives 达到 0 消息应该显示:
press R to Restart
我添加了我认为是“r”的 KeyListener 的内容，它符合要求，但不起作用。
其他一切似乎都按计划进行。
class CharlieBrownGamePanel extends JPanel implements Runnable
{
/** data variables */
private int xCord=135, yCord=0;
private int randXCord, randYCord;
//private String movingMsg = "Moving Forward ";
private int numHits=0, numLives=5;
private boolean xNeedsToTurn=false, yNeedsToTurn=false;
private String message = "CLICK ON THE BALL TO WIN!";
private String hitsMsg = "Number of Hits"+numHits;
private String livesMsg = "Number of Lives: "+numLives;
private boolean hitTarget = false;
private static final int EDGE = 30;
private static final int ADJUST = 5;
private Dimension dim = null;
private Thread animate = null;
public CharlieBrownGamePanel(Dimension dim) // as a JPanel, need a constructor
{
this.dim = dim;
setBackground(Color.black);
setForeground(Color.blue);
addMouseListener(new MouseHandler());
addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()== 'r') {
xCord=getRandXCord();
yCord=getRandYCord();
animate.start();
numHits=0;
numLives=5;
hitTarget = false;
hitsMsg = "Number of Hits:" +numHits;
livesMsg= "Number of Lives: "+numLives;
message = "MISSED AGAIN";
repaint();
}
}
});
}
public void run() // as a Runnable class, need to override run() method
{
try
{
while(true)
{
repaint();
Thread.sleep(100);
// char temp = movingMsg.charAt(0);
// movingMsg = movingMsg.substring(1,movingMsg.length());
// movingMsg += temp ;
/** determine if ball is close to edge of screen,
if so, reverse ball's direction
*/
if(!xNeedsToTurn && xCord<(dim.width-EDGE)) //if still more room to go right
{
xCord+=ADJUST;
}
else // otherwise
{
xNeedsToTurn = (xCord>=EDGE);
xCord-=ADJUST;
}
if(!yNeedsToTurn && yCord<(dim.height-EDGE)) //if still more room to go down
{
yCord+=ADJUST;
}
else // otherwise
{
numLives-=1;
xCord=getRandXCord();
yCord=getRandYCord();
hitsMsg = "Number of Hits:" +numHits;
livesMsg= "Number of Lives: "+numLives;
message = "MISSED AGAIN";
}
if(numLives==0)
{
animate.stop();
hitsMsg = "Number of Hits:" +numHits;
livesMsg= "Number of Lives: "+numLives;
message = "GAME OVER! Press R to restart.";
}
}//end of while loop
}
catch(InterruptedException e) {
}
} //end of run method
public void paintComponent(Graphics g)
{
super.paintComponent(g);
//g.setColor(Color.red);
g.fillOval(xCord,yCord,15,15);
g.setFont(new Font("SanSerif",Font.BOLD,25));
g.drawString(message,30,30);
g.drawString(hitsMsg,30,70);
g.drawString(livesMsg,30,110);
}
public void checkForHit(int newx, int newy)
{
if((newx >=xCord) && (newx <=(xCord+15)) &&
(newy >=yCord) && (newy <=(yCord+15)))
{
hitTarget = true;
numHits+=1;
hitsMsg = "Number of Hits:" +numHits;
livesMsg= "Number of Lives: "+numLives;
message = "That's a Hit!";
xCord=getRandXCord();
yCord=getRandYCord();
}
else
{
hitTarget = false;
hitsMsg = "Number of Hits:" +numHits;
livesMsg= "Number of Lives: "+numLives;
message = "MISSED AGAIN";
}
}
/** USING THE ADAPTER CLASS FOR Mouse Listener */
private class MouseHandler extends MouseAdapter
{
public void mousePressed(MouseEvent e)
{
checkForHit(e.getX(),e.getY());
repaint();
}
} //end of MouseHandler class
private int getRandXCord(){
randXCord= (int)(Math.random() * (dim.width +1));
return randXCord;
}
private int getRandYCord(){
randYCord= (int)(Math.random() * (100 +1));
return randYCord;
}
} //end of class task and panel
最佳答案
首先，KeyEvent#getKeyCode 返回虚拟键代码，而不是字符。看一下 KeyEvent.VK_R。
其次，KeyListerners 仅当它们注册的组件可聚焦并且具有键盘焦点时才会响应。 JPanel，默认情况下无法接收键盘焦点
第三，您应该使用 Key Bindings因为他们会克服这些缺点
关于java - 在 JApplet 上使用 KeyAdapter 和 Thread 重置/重新启动我的迷你游戏，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16559354/