老师，操控键盘飞机不动，这个代码哪里有问题呢？
package cn.sxt.game;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
/*
* 飞机小游戏
*/
public class MyGameFrame extends Frame {
Image planeImg = GameUtil.getImage("images/plane.png");
Image bg=GameUtil.getImage("images/bg.jpg");
Plane p1=new Plane(planeImg,100,100,3);
boolean left,right,up,down; //飞机的方向控制
@Override
public void paint(Graphics g) { //自动被调用，g相当于一支画笔
g.drawImage(bg, 0, 0,500,500,null);
p1.drawMyself(g);
if(left) {
p1.x-=p1.speed;
}
if(right) {
p1.x+=p1.speed;
}
if(up) {
p1.y+=p1.speed;
}
if(down) {
p1.y-=p1.speed;
}
}
//初始化窗口
public void launchFrame() {
this.setTitle("小飞机大战");
this.setSize(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);
this.setLocation(400,200);
this.setVisible(true);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
new PaintThread().start();//启动重画窗口的线程
this.addKeyListener(new KeyMonitor()); //启动键盘监听
}
/*
* 定义了一个重画窗口的线程类
* 定义成内部类是为了方便直接使用窗口类的相关方法
*/
class PaintThread extends Thread{
@Override
public void run() {
while(true) {
repaint();//内部类可以直接使用外部类的成员
try {
Thread.sleep(50); //1s=1000ms,1s画20次（20*50=1000）
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
//内部类，实现键盘的监听处理
class KeyMonitor extends KeyAdapter{
public void keyPressesed(KeyEvent e) {
/*System.out.println("按下"+e.getKeyCode());
if(e.getKeyCode()==KeyEvent.VK_LEFT) {
left=true;
}
*/
switch(e.getKeyCode()) {
case KeyEvent.VK_LEFT:
left=true;
break;
case KeyEvent.VK_RIGHT:
right=true;
break;
case KeyEvent.VK_UP:
up=true;
break;
case KeyEvent.VK_DOWN:
down=true;
break;
}
}
public void keyReleased(KeyEvent e) {
/*System.out.println("抬起"+e.getKeyCode());
if(e.getKeyCode()==KeyEvent.VK_LEFT) {
left=false;
}*/
switch(e.getKeyCode()) {
case KeyEvent.VK_LEFT:
left=false;
break;
case KeyEvent.VK_RIGHT:
right=false;
break;
case KeyEvent.VK_UP:
up=false;
break;
case KeyEvent.VK_DOWN:
down=false;
break;
}
}
}
private Image offScreenImage = null;
public void update(Graphics g) {
if(offScreenImage == null)
offScreenImage = this.createImage(Constant.GAME_WIDTH,Constant.GAME_HEIGHT);//这是游戏窗口的长的和宽度
Graphics gOff = offScreenImage.getGraphics();
paint(gOff);
g.drawImage(offScreenImage, 0, 0, null);
}
public static void main(String[] args) {
MyGameFrame gameFrame=new MyGameFrame();
gameFrame.launchFrame();
}
}
package cn.sxt.game;
import java.awt.Graphics;
import java.awt.Image;
public class Plane extends GameObject{
public void drawMyself(Graphics g) {
super.drawMyself(g);
//飞机飞行的算法，可以自行设定
//x+=speed;
}
public Plane(Image img,double x,double y,int speed) {
super(img,x,y,speed);
}
}
这个怎么理解？不太明白，一个构造函数赋值？
老师，为什么关闭VScode之后，再打开，在终端输入npm run serve，在百度输入localhost:8080还是打不开啊
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