我刚刚开始学习编程applet和
java GUI,我试图制作一个简单的游戏.目前,我有主要类(游戏)和玩家类(玩家)我让玩家画到屏幕上,但我很难让关键事件发挥作用,任何帮助赞赏！
玩家图像显示完全正常,但当我完全按下按键时位置不会改变.
编辑：为播放器发布错误代码,更新
Game.java：
public class Game extends Applet {
Player player;
@Override
public void init() {
player = new Player(this);
this.setSize(800,600);
addKeyListener(player);
}
@Override
public void paint(Graphics g) {
player.paint(g);
}
}
Player.java：
public class Player implements KeyListener {
Game game;
Image image;
int x;
int y;
public Player(Game game) {
this.game = game;
x = 0;
y = 0;
image = game.getimage(game.getCodeBase(),"images/Player.png");
}
public void paint(Graphics g) {
g.drawImage(image,x,y,game);
}
@Override
public void keyTyped(KeyEvent e) {
return;
}
@Override
public void keypressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_A:
x -= 1;
break;
case KeyEvent.VK_D:
x += 1;
break;
case KeyEvent.VK_S:
y += 1;
break;
case KeyEvent.VK_W:
y -= 1;
break;
}
game.repaint();
}
@Override
public void keyreleased(KeyEvent e) {
return;
}
}
解决方法
面板可能要么没有焦点,要么没有焦点.
试试这个代码.我将键更改为左/右/上/下箭头.为简单起见,我把它留作了基于AWT的applet.
// <applet code='Game' width=400 height=100></applet>
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Game extends Applet implements KeyListener {
Player player;
@Override
public void init() {
player = new Player(getimage(32));
addKeyListener(this);
setFocusable(true);
requestFocusInWindow();
}
@Override
public void paint(Graphics g) {
player.paint(g);
}
public Image getimage(int size) {
Image img = createImage(size,size);
Graphics g = img.getGraphics();
g.setColor(Color.RED);
g.fillRect(0,size,size);
g.dispose();
return img;
}
@Override
public void keyTyped(KeyEvent e) {
return;
}
@Override
public void keypressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_LEFT:
player.x -= 1;
break;
case KeyEvent.VK_RIGHT:
player.x += 1;
break;
case KeyEvent.VK_DOWN:
player.y += 1;
break;
case KeyEvent.VK_UP:
player.y -= 1;
break;
}
repaint();
}
@Override
public void keyreleased(KeyEvent e) {
return;
}
}
class Player {
Image image;
int x;
int y;
public Player(Image image) {
x = 0;
y = 0;
this.image = image;
}
public void paint(Graphics g) {
g.drawImage(image,null);
}
}