我是java的新手，我正在尝试创建一个Space Invaders游戏作为我的第一个“更大”的桌面项目。目前我已经为Space Invaders Tutorial添加了一些设计模式，但我一直在尝试添加一个菜单几天，我在网上发现的任何东西都没有。在实际找到一些有用的代码并将其添加到 SpaceInvaders 类后，我陷入困境。问题是，在我从主菜单中选择“新游戏”之后，游戏开始并且一切正常，除了玩家之外 - 它应该使用箭头键移动并使用alt进行拍摄，但它根本没有响应。 这是代码的一部分：
public class SpaceInvaders extends JFrame implements ActionListener, Commons {
private static final long serialVersionUID = 1L;
JButton play = new JButton("New Game");
JButton scores = new JButton("High Scores");
JButton exit = new JButton("Exit");
JButton mainMenu = new JButton("Main Menu");
CardLayout layout = new CardLayout();
JPanel panel = new JPanel();
JPanel game = new JPanel();
JPanel menu = new JPanel();
Board board = new Board();
public SpaceInvaders() {
panel.setLayout(layout);
addButtons();
setSize(BOARD_WIDTH, BOARD_HEIGTH);
setResizable(false);
setLocationRelativeTo(null);
setVisible(true);
setTitle("Space Invaders");
setDefaultCloseOperation(EXIT_ON_CLOSE);
requestFocus();
}
private void addButtons() {
play.addActionListener(this);
scores.addActionListener(this);
exit.addActionListener(this);
mainMenu.addActionListener(this);
//menu buttons
menu.add(play);
menu.add(scores);
menu.add(exit);
//background colors
menu.setBackground(Color.BLACK);
//adding children to parent Panel
panel.add(menu,"Menu");
panel.add(board,"Game");
add(panel);
layout.show(panel,"Menu");
}
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if (source == exit) {
System.exit(0);
} else if (source == play) {
//add(new Board());
layout.show(panel, "Game");
}
}
public static void main(String[] args) {
new SpaceInvaders();
}
}
public class Board extends JPanel implements Runnable, Commons {
private Dimension d;
private ArrayList aliens;
private Player player = Player.getInstance();
private Shot shot;
private int alienX = 150;
private int alienY = 5;
private int direction = -1;
private int deaths = 0;
private boolean ingame = true;
private final String expl = "../spacepix/explosion.png";
private final String alienpix = "../spacepix/alien.png";
private String message = "Game Over";
private Thread animator;
public Board()
{
//addKeyListener(new TAdapter());
setFocusable(true);
d = new Dimension(BOARD_WIDTH, BOARD_HEIGTH);
setBackground(Color.black);
gameInit();
getInputMap(IFW).put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "left");
getInputMap(IFW).put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), "right");
getInputMap(IFW).put(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0), "shoot");
getInputMap(IFW).put(KeyStroke.getKeyStroke(KeyEvent.VK_ALT, 0), "alt");
getActionMap().put("shoot", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
int x = player.getX();
int y = player.getY();
if (ingame) {
if (!shot.isVisible())
shot = new Shot(x, y);
}
}
});
getActionMap().put("left", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
player.moveLeft();
}
});
getActionMap().put("right", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
player.moveRight();
}
});
getActionMap().put("alt", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
}
});
setDoubleBuffered(true);
}
public void addNotify() {
super.addNotify();
gameInit();
}
public void gameInit() {
//aliens work, so I deleted them form here
// player = new Player();
shot = new Shot();
if (animator == null || !ingame) {
animator = new Thread(this);
animator.start();
}
}
//drawing aliens, players, bombs, shots and background also works
public void animationCycle() {
if (deaths == NUMBER_OF_ALIENS_TO_DESTROY) {
ingame = false;
message = "Game won!";
}
// player
player.act();
// player's shot
if (shot.isVisible()) {
Iterator it = aliens.iterator();
int shotX = shot.getX();
int shotY = shot.getY();
while (it.hasNext()) {
Alien alien = (Alien) it.next();
int alienX = alien.getX();
int alienY = alien.getY();
if (alien.isVisible() && shot.isVisible()) {
if (shotX >= (alienX) &&
shotX <= (alienX + ALIEN_WIDTH) &&
shotY >= (alienY) &&
shotY <= (alienY+ALIEN_HEIGHT) ) {
ImageIcon ii =
new ImageIcon(getClass().getResource(expl));
alien.setImage(ii.getImage());
alien.setDying(true);
deaths++;
shot.die();
}
}
}
int y = shot.getY();
y -= 4;
if (y < 0)
shot.die();
else shot.setY(y);
}
// aliens
// bombs
// those work
}
public void run() {
long beforeTime, timeDiff, sleep;
beforeTime = System.currentTimeMillis();
while (ingame) {
repaint();
animationCycle();
timeDiff = System.currentTimeMillis() - beforeTime;
sleep = DELAY - timeDiff;
if (sleep < 0)
sleep = 2;
try {
Thread.sleep(sleep);
} catch (InterruptedException e) {
System.out.println("interrupted");
}
beforeTime = System.currentTimeMillis();
}
gameOver();
}
public class Player extends Sprite implements Commons{
private static Player instance;
private final int START_Y = 280;
private final int START_X = 270;
private final String player = "../spacepix/player.png";
private int width;
private Player() {
ImageIcon ii = new ImageIcon(this.getClass().getResource(player));
width = ii.getImage().getWidth(null);
setImage(ii.getImage());
setX(START_X);
setY(START_Y);
}
public static synchronized Player getInstance() {
if(instance == null)
{
instance = new Player();
}
return instance;
}
public void act() {
x += dx;
if (x <= 2){
x = 2;
}
if (x >= BOARD_WIDTH - 2*width) {
x = BOARD_WIDTH - 2*width;
}
//dx = 0;
}
public void moveLeft(){
dx = -2;
}
public void moveRight(){
dx = 2;
}
}
有人能告诉我该怎么做才能运作吗？我可能要么错误地初始化播放器，要么从一个菜单切换到另一个菜单，但我一直试图修复它几个小时，现在我已经没有想法了。提前谢谢。
P.S。我想在添加菜单之前添加一切正常。如果有人需要，我可以上传整个代码。