呃，我很抱歉MadProgrammer，但我无法让KeyBinding以我想要的方式工作:(但是我会继续看一些教程，直到我弄明白。现在虽然我已经坚持使用KeyListener并且它可以工作。但现在我遇到了一个问题，其中 p.move（）; 实际上并没有移动播放器。我放入的所有其他代码都可以正常工作除了 p.move（）; 。我可能不应该问这么多问题，所以如果你想让我停下来就这么说，但整个SO社区真的很好。再说一次，我ll发布代码。
主要课程：
import javax.swing.*;
public class Game extends JFrame{
public static void main(String[] args){
new Game();
}
public Game(){
add(new Board());
setTitle("Hi mom");
setSize(555,330);
setResizable(false);
setLocationRelativeTo(null);
setDefaultCloseOperation(3);
setVisible(true);
}
}
董事会成员：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Board extends JPanel implements ActionListener {
Image background;
Player p;
boolean moving;
public Board() {
setFocusable(true);
requestFocus();
addKeyListener(new KeyInputEvents());
Timer timer = new Timer(25, this);
timer.start();
ImageIcon img = new ImageIcon(getClass().getResource("images/map.png"));
background = img.getImage();
p = new Player();
}
public void paint(Graphics g) {
g.drawImage(background, 0, 0, null);
g.drawImage(p.getPlayer(), p.getX(), p.getY(), null);
}
public void actionPerformed(ActionEvent e) {
repaint();
}
public JPanel getBoard(){
return this;
}
)
玩家类（这可能是出错的地方）：
import javax.swing.*;
import java.awt.*;
public class Player{
int x = 30;
int y = 187;
Image player;
public Player(){
ImageIcon img = new ImageIcon(getClass().getResource("images/player.png"));
player = img.getImage();
}
public Image getPlayer(){
return player;
}
public void move(int x, int y){
this.x += x;
this.y += y;
}
public int getX(){
return x;
}
public int getY(){
return y;
}
)
KeyInputEvents类：
import java.awt.event.*;
import javax.swing.*;
public class KeyInputEvents extends KeyAdapter implements ActionListener{
int k;
boolean moving = true;
Player p = new Player();
public KeyInputEvents(){
Timer timer = new Timer(25,this);
timer.start();
}
public void keyPressed(KeyEvent e){
k = e.getKeyCode();
moving = true;
}
public void keyReleased(KeyEvent e){
moving = false;
}
public void actionPerformed(ActionEvent e) {
if(k == 'D' && moving == true){p.move(5,0);}
if(k == 'A' && moving == true){p.move(-5,0);}
}
}
答案 0 :(得分：1)
屏幕上显示的Player与Player课程中移动的KeyInputEvents不一样......
在Board中，您创建了Player ...
public class Board extends JPanel implements ActionListener {
Player p;
public Board() {
//...
p = new Player();
}
在KeyInputEvents中你创建另一个......
public class KeyInputEvents extends KeyAdapter implements ActionListener {
//....
Player p = new Player();
这两个实例没有任何关系......
虽然我在这里，但你不应该真的覆盖paint，而应覆盖paintComponent，你绝对应该调用super.paintXxx
使用密钥绑定示例进行更新
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.ImageIcon;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.Timer;
public class Game extends JFrame {
public static void main(String[] args) {
new Game();
}
public Game() {
add(new Board());
setTitle("Hi mom");
setSize(555, 330);
setResizable(false);
setLocationRelativeTo(null);
setDefaultCloseOperation(3);
setVisible(true);
}
public class Board extends JPanel implements ActionListener {
Image background;
Player p;
private int xDelta, yDelta;
public Board() {
setFocusable(true);
requestFocus();
ImageIcon img = new ImageIcon(getClass().getResource("/images/map.jpg"));
background = img.getImage();
p = new Player();
InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, 0, false), "Left.move");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, 0, true), "Left.stop");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_D, 0, false), "Right.move");
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_D, 0, true), "Right.stop");
ActionMap am = getActionMap();
am.put("Left.move", new MoveLeft(this));
am.put("Left.stop", new StopAllMovement(this));
am.put("Right.move", new MoveRight(this));
am.put("Right.stop", new StopAllMovement(this));
Timer timer = new Timer(25, this);
timer.start();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g); //To change body of generated methods, choose Tools | Templates.
g.drawImage(background, 0, 0, null);
g.drawImage(p.getPlayer(), p.getX(), p.getY(), null);
}
protected void setMovement(int xDelta, int yDelta) {
this.xDelta = xDelta;
this.yDelta = yDelta;
}
public void actionPerformed(ActionEvent e) {
p.move(xDelta, yDelta);
repaint();
}
public JPanel getBoard() {
return this;
}
}
public class Player {
int x = 30;
int y = 187;
Image player;
public Player() {
ImageIcon img = new ImageIcon(getClass().getResource("/images/player.png"));
player = img.getImage();
}
public Image getPlayer() {
return player;
}
public void move(int x, int y) {
this.x += x;
this.y += y;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
}
public abstract class AbstractMove extends AbstractAction {
private Board board;
private int xDelta;
private int yDelta;
public AbstractMove(Board board, int xDelta, int yDelta) {
this.board = board;
this.xDelta = xDelta;
this.yDelta = yDelta;
}
@Override
public void actionPerformed(ActionEvent e) {
board.setMovement(xDelta, yDelta);
}
}
public class MoveLeft extends AbstractMove {
public MoveLeft(Board board) {
super(board, -5, 0);
}
}
public class MoveRight extends AbstractMove {
public MoveRight(Board board) {
super(board, 5, 0);
}
}
public class StopAllMovement extends AbstractMove {
public StopAllMovement(Board board) {
super(board, 0, 0);
}
}
}