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我正在製作一個簡單的Snake遊戲，除了Key Listener之外，一切似乎都正常。基於我所看到的一切，它被正確書寫。使用Key Listeners更改JFrame
遊戲顯示出來，但即使按下箭頭鍵，Snake也不會移動。
在此先感謝！
這是主要的：
public class SnakeFrame extends JFrame implements KeyListener{
/**
*
*/
private static final long serialVersionUID = 1L;
private int direction;
private World w;
private WorldComponant wc;
GameLoopThread glt;
public SnakeFrame(){
setSize(420,440);
setTitle("Snake");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = getContentPane();
c.setLayout(new BorderLayout());
w = new World();
wc = new WorldComponant(w);
glt = new GameLoopThread(wc);
direction = Direction.SOUTH;
c.add(wc);
}
public static void main(String[] args){
SnakeFrame s = new SnakeFrame();
s.setVisible(true);
}
public void keyPressed(KeyEvent e) {
switch(e.getKeyCode()){
case (KeyEvent.VK_UP):{
if(direction!=Direction.SOUTH){
direction = Direction.NORTH;
wc.move(direction);
}
break;
}
case (KeyEvent.VK_DOWN):{
if(direction!=Direction.NORTH){
direction = Direction.SOUTH;
wc.move(direction);
}
break;
}
case (KeyEvent.VK_RIGHT):{
if(direction!=Direction.WEST){
direction = Direction.EAST;
wc.move(direction);
}
break;
}
case (KeyEvent.VK_LEFT):{
if(direction!=Direction.EAST){
direction = Direction.WEST;
wc.move(direction);
}
break;
}
}
}
@Override
public void keyReleased(KeyEvent e) {
}
@Override
public void keyTyped(KeyEvent e) {
}
}
這是GameLoopThread：
public class GameLoopThread extends Thread{
private WorldComponant sc;
public GameLoopThread(WorldComponant sc){
this.sc = sc;
}
public void run(){
while(true){
sc.repaint();
try{
Thread.sleep(100);
}catch(Exception e){
e.printStackTrace();
}
}
}
}
這是移動方法。它是世界級的內部，從WorldComponant也被稱爲：
public void move(int direction) {
Point head = snake.peekFirst();
Point newPt = head;
switch(direction){
case (Direction.NORTH):{
newPt = new Point(head.x, head.y-1);
break;
}
case (Direction.SOUTH):{
newPt = new Point(head.x, head.y+1);
break;
}
case (Direction.WEST):{
newPt = new Point(head.x-1, head.y);
break;
}
case (Direction.EAST):{
newPt = new Point(head.x+1, head.y);
break;
}
}
snake.remove(snake.peekLast());
if(newPt.equals(food)){
Point addPt = (Point) newPt.clone();
switch(direction){
case (Direction.NORTH):{
newPt = new Point(head.x, head.y-1);
break;
}
case (Direction.SOUTH):{
newPt = new Point(head.x, head.y+1);
break;
}
case (Direction.WEST):{
newPt = new Point(head.x-1, head.y);
break;
}
case (Direction.EAST):{
newPt = new Point(head.x+1, head.y);
break;
}
}
score++;
snake.add(addPt);
placeFood();
}
else if(newPt.x < 0 || newPt.x > gridw - 1){
generateDefaultSnake();
JOptionPane.showMessageDialog(null, "YOU LOST! :(", "Loser!", JOptionPane.ERROR_MESSAGE);
return;
}
else if(newPt.y < 0 || newPt.y > gridh - 1){
generateDefaultSnake();
JOptionPane.showMessageDialog(null, "YOU LOST! :(", "Loser!", JOptionPane.ERROR_MESSAGE);
return;
}
else if(snake.contains(newPt)){
generateDefaultSnake();
JOptionPane.showMessageDialog(null, "YOU LOST! :(", "Loser!", JOptionPane.ERROR_MESSAGE);
return;
}
snake.add(newPt);
}
你曾經的實施KeyListener的添加到您的JFrame？另一方面，如果你的WorldComponant類需要成爲'JComponent'的子類，你應該考慮使用鍵綁定。 – TNT 2015-02-24 18:49:58
請勿使用KeyListener！請參閱[使用鍵盤移動]（https://tips4java.wordpress.com/2013/06/09/motion-using-the-keyboard/）以獲得使用「鍵綁定」的更好方法。 – camickr 2015-02-24 19:09:44