我有一个输入类。当按下它设置 player.hasJumped = true; 当 hasJumped 为真时,它在播放器类中将 dy 更改为 -3。问题是,hasJumped 被设置为 true,但变量没有改变。我真的不明白为什么会这样。这是我的代码的简短示例,如果需要,我可以提供更多。
输入处理程序.java
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class InputHandler implements KeyListener{
Player player = new Player();
private boolean[] keys = new boolean[120];
public boolean up;
public void tick(){
up = keys[KeyEvent.VK_UP] || keys[KeyEvent.VK_W];
if(player.jumpReady){
if(up){
player.inAir = true;
System.out.println("JUMPED " + player.inAir);
}
}
}
public void keyPressed(KeyEvent e) {
keys[e.getKeyCode()] = true;
}
public void keyReleased(KeyEvent e) {
keys[e.getKeyCode()] = false;
}
播放器.java
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class Player {
int x;
int y;
int dx;
public long xElapsed = 0;
public int dy;
int width = 50;
int height = 75;
public int hangTime = 0;
int maxHangTime = 100;
int nextX = 1000;
public int playerSpeed = 7;
public int coinsCollected = 0;
public boolean isMoving = true;
public boolean hasJumped = false;
public boolean jumpReady = true;
public boolean hasCollided = false;
public boolean inAir = false;
private BufferedImage moving1 = null;
private String path1 = "res/player_moving_1.png";
public Player(){
try {
moving1 = ImageIO.read(new File(path1));
}catch (IOException e) {
e.printStackTrace();
System.err.println("Could not load image " + moving1 + " at path" + path1);
}
x = 150;
y = 250;
}
public void render(Graphics g){
Graphics2D g2d = (Graphics2D) g;
g2d.drawImage(moving1, x, y, null);
}
public void move(){
x = x + dx;
y = y + dy;
xElapsed++;
if(xElapsed == nextX){
upSpeed();
nextX += 1000;
}
if(inAir){
System.out.println("test");
dy = -3;
}
}
public void paint(Graphics g){
g.setColor(Color.RED);
g.fillRect(x, y, width, height);
}
public void upSpeed(){
playerSpeed++;
}
public int getX(){
return x;
}
public int getY(){
return y;
}
public long getXElapsed(){
return xElapsed;
}
public double getSpeed(){
return playerSpeed;
}
public int getNextX(){
return nextX;
}
public int getCoinsCollected(){
return coinsCollected;
}
public Rectangle bounds(){
return (new Rectangle(x, y, width, height));
}
}
游戏.java
private static final long serialVersionUID = 1L;
public static final int WIDTH = 350;
public static final int HEIGHT = WIDTH / 16 * 9;
public static final int SCALE = 2;
private Thread thread;
private JFrame frame;
private InputHandler input;
private boolean running = false;
private Screen screen;
private BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
private int[] pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData();
Player player = new Player();
public Game() {
Dimension size = new Dimension(WIDTH * SCALE, HEIGHT * SCALE);
setPreferredSize(size);
screen = new Screen(WIDTH, HEIGHT);
frame = new JFrame();
input = new InputHandler();
addKeyListener(input);
setFocusable(true);
}
public void run() {
long lastTime = System.nanoTime();
long timer = System.currentTimeMillis();
final double ns = 1000000000.0 / 60.0;
double delta = 0;
int frames = 0;
int ticks = 0;
while(running){
long now = System.nanoTime();
delta += (now - lastTime) / ns;
lastTime = now;
while(delta >= 1){
tick();
ticks++;
delta--;
}
render();
frames++;
if(System.currentTimeMillis() - timer > 1000){
timer += 1000;
System.out.println(ticks + " tps, " + frames + " fps");
ticks = 0;
frames = 0;
}
}
stop();
}
public void tick(){
input.tick();
player.move();
collision();
obstacleHole.move();
obstacleWolf.move();
coin.move();
}