我希望用户能够通过按Enter键选择开始游戏。在keyPressed方法中，我已经根据我的知识进行了设置。但是，当我运行程序时，字符已经在屏幕上移动，按下输入只会加速它们。如果有人能让我知道出了什么问题，并指出我正确的方向，我将非常感激！感谢。
代码：
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ZombieAttackMain extends Applet implements Runnable, KeyListener, ActionListener{
private Image background;
Player p;
NormalZombie nz;
FastZombie fz;
TankyZombie tz;
Cow c1;
Cow c2;
Cow c3;
Cow c4;
Bullet b;
private Graphics bufferGraphics;
private Image offScreen;
public final static int POSITION_1_Y = 100;
public final static int POSITION_2_Y = 255;
public final static int POSITION_3_Y = 400;
public final static int POSITION_4_Y = 550;
private boolean running = true;
public void init(){
setSize(1100, 700);
background = getImage(getCodeBase(), "Background.jpg");
p.player = getImage(getCodeBase(), "Player.png");
nz.normalZombie = getImage(getCodeBase(), "NormalZombie.png");
fz.fastZombie = getImage(getCodeBase(), "FastZombie.png");
tz.tankyZombie = getImage(getCodeBase(), "TankyZombie.png");
c1.cow = getImage(getCodeBase(), "Cow.png");
c2.cow = getImage(getCodeBase(), "Cow.png");
c3.cow = getImage(getCodeBase(), "Cow.png");
c4.cow = getImage(getCodeBase(), "Cow.png");
b.bullet = getImage(getCodeBase(), "Bullet.png");
addKeyListener(this);
}
public void start() {
p = new Player();
nz = new NormalZombie();
fz = new FastZombie();
tz = new TankyZombie();
c1 = new Cow();
c2 = new Cow();
c3 = new Cow();
c4 = new Cow();
b = new Bullet();
Thread thread = new Thread(this);
thread.start();
}
public void run() {
while(running){
if(nz.getNormalZombieXPosition() <= b.getBulletXPosition() && nz.getNormalZombieYPosition() >= b.getBulletYPosition() - 85
&& nz.getNormalZombieYPosition() <= b.getBulletYPosition() + 85){
nz.setShowNormalZombie(false);
nz.setNormalZombieXPosition(1200);
b.setShowBullet(false);
b.setBulletXPosition(1200);
}
if(fz.getFastZombieXPosition() <= b.getBulletXPosition() && fz.getFastZombieYPosition() >= b.getBulletYPosition() - 85
&& fz.getFastZombieYPosition() <= b.getBulletYPosition() + 85){
fz.setShowFastZombie(false);
fz.setFastZombieXPosition(1200);
b.setShowBullet(false);
b.setBulletXPosition(-500);
}
if(tz.getTankyZombieHP() == 2 && tz.getTankyZombieXPosition() <= b.getBulletXPosition() && tz.getTankyZombieYPosition()
>= b.getBulletYPosition() - 85 && tz.getTankyZombieYPosition() <= b.getBulletYPosition() + 85){
b.setBulletXPosition(-500);
b.setShowBullet(false);
tz.setTankyZombieHP(1);
}
if(tz.getTankyZombieHP() == 1 && tz.getTankyZombieXPosition() <= b.getBulletXPosition() && tz.getTankyZombieYPosition()
>= b.getBulletYPosition() - 85 && tz.getTankyZombieYPosition() <= b.getBulletYPosition() + 85){
b.setShowBullet(false);
b.setBulletXPosition(-500);
tz.setShowTankyZombie(false);
tz.setTankyZombieXPosition(1200);
}
if(nz.getNormalZombieXPosition() <= c1.getCowXPosition() + 190 && nz.getNormalZombieYPosition() == POSITION_1_Y){
c1.setShowCow1(false);
}
if(fz.getFastZombieXPosition() <= c1.getCowXPosition() + 190 && fz.getFastZombieYPosition() == POSITION_1_Y){
c1.setShowCow1(false);
}
if(tz.getTankyZombieXPosition() <= c1.getCowXPosition() + 190 && tz.getTankyZombieYPosition() == POSITION_1_Y){
c1.setShowCow1(false);
}
if(nz.getNormalZombieXPosition() <= c2.getCowXPosition() + 190 && nz.getNormalZombieYPosition() == POSITION_2_Y){
c2.setShowCow2(false);
}
if(fz.getFastZombieXPosition() <= c2.getCowXPosition() + 190 && fz.getFastZombieYPosition() == POSITION_2_Y){
c2.setShowCow2(false);
}
if(tz.getTankyZombieXPosition() <= c2.getCowXPosition() + 190 && tz.getTankyZombieYPosition() == POSITION_2_Y){
c2.setShowCow2(false);
}
if(nz.getNormalZombieXPosition() <= c3.getCowXPosition() + 190 && nz.getNormalZombieYPosition() == POSITION_3_Y){
c3.setShowCow3(false);
}
if(fz.getFastZombieXPosition() <= c3.getCowXPosition() + 190 && fz.getFastZombieYPosition() == POSITION_3_Y){
c3.setShowCow3(false);
}
if(tz.getTankyZombieXPosition() <= c3.getCowXPosition() + 190 && tz.getTankyZombieYPosition() == POSITION_3_Y){
c3.setShowCow3(false);
}
if(nz.getNormalZombieXPosition() <= c4.getCowXPosition() + 190 && nz.getNormalZombieYPosition() == POSITION_4_Y){
c4.setShowCow4(false);
}
if(fz.getFastZombieXPosition() <= c4.getCowXPosition() + 190 && fz.getFastZombieYPosition() == POSITION_4_Y){
c4.setShowCow4(false);
}
if(tz.getTankyZombieXPosition() <= c4.getCowXPosition() + 190 && tz.getTankyZombieYPosition() == POSITION_4_Y){
c4.setShowCow4(false);
}
repaint();
try {
Thread.sleep(17);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public void paint(Graphics g){
g.drawImage(background,0,0,null);
p.paint(g);
if(nz.getShowNormalZombie() == true){
nz.paint(g);
nz.setNormalZombieXPosition(nz.getNormalZombieXPosition() + nz.getNormalZombieDx());
}
if(fz.getShowFastZombie() == true){
fz.paint(g);
fz.setFastZombieXPosition(fz.getFastZombieXPosition() + fz.getFastZombieDx());
}
if(tz.getShowTankyZombie() == true){
tz.paint(g);
tz.setTankyZombieXPosition(tz.getTankyZombieXPosition() + tz.getTankyZombieDx());
}
if(c1.getShowCow1() == true){
c1.paint(g);
c1.setCowYPosition(POSITION_1_Y);
}
if(c2.getShowCow2() == true){
c2.paint(g);
c2.setCowYPosition(POSITION_2_Y);
}
if(c3.getShowCow3() == true){
c3.paint(g);
c3.setCowYPosition(POSITION_3_Y);
}
if(c4.getShowCow4() == true){
c4.paint(g);
c4.setCowYPosition(POSITION_4_Y);
}
if(b.getShowBullet()){
b.paint(g);
b.setBulletXPosition(b.getBulletXPosition() + b.getBulletDX());
if(b.getBulletXPosition() > 1100){
b.setShowBullet(false);
}
}
}
public void keyPressed(KeyEvent e) {
switch(e.getKeyCode()){
case KeyEvent.VK_UP:
p.moveUp(p);
break;
case KeyEvent.VK_DOWN:
p.moveDown(p);
break;
case KeyEvent.VK_SPACE:
b.spawnBullet();
break;
case KeyEvent.VK_ENTER:
start();
break;
}
}
public void update(Graphics g){
if(offScreen == null){
offScreen = createImage(this.getWidth(), this.getHeight());
bufferGraphics = offScreen.getGraphics();
}
bufferGraphics.setColor(getBackground());
bufferGraphics.fillRect(0,0,this.getWidth(),this.getHeight());
bufferGraphics.setColor(getForeground());
paint(bufferGraphics);
g.drawImage(offScreen,0,0,this);
}
public static int getPosition1Y() {
return POSITION_1_Y;
}
public static int getPosition2Y() {
return POSITION_2_Y;
}
public static int getPosition3Y() {
return POSITION_3_Y;
}
public static int getPosition4Y() {
return POSITION_4_Y;
}
public void stop() {
running = false;
}
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
}
public void actionPerformed(ActionEvent arg0) {
}
}
答案 0 :(得分：1)
然而，当我运行该程序时，字符已经在屏幕上移动并且按下输入仅加速它们
applet在加载时调用start（）方法，因此你的游戏Thread会自动启动。
按Enter键仅加快速度
你再次调用start方法，所以现在你有两个游戏线程正在运行。
例如，创建一个名为startGame()的方法。将代码从start（）移动到该方法中。然后在按下Enter键时调用startGame（）。您还希望您的代码确保游戏当前没有运行，因此您不会两次启动游戏。
答案 1 :(得分：0)
嗯......我不是百分百肯定，但它可能与变量“Running”有关。尝试将其设置为false，然后在用户点击“enter”时将其设置为true。