程序運行，但沒有任何顯示

Question

我一直在試圖讓我的角色在遊戲中移動我正試圖編程一段時間。我設法讓它顯示，但是當我添加應該移動它的代碼時，它不再顯示。我是新來的編程，所以我一直從我的網上找到的一些代碼中進行一些修改，但我不知道我做錯了什麼。

Execute.java

import java.awt.EventQueue; 
import java.awt.Graphics; 
import javax.swing.JComponent; 
import javax.swing.JFrame; 

public class Execute extends JFrame { 
public Execute() { 
    initUI(); 
} 

public static void initUI() { 
    JFrame jf = new JFrame(); 
    jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    jf.setSize(600,600); 
    jf.setTitle("I am the salad baby"); 

    jf.add(new Board()); 
} 

public static void main (String[] args) { 
    EventQueue.invokeLater(new Runnable() { 
    @Override 
    public void run() { 
    Execute ex = new Execute(); 
    ex.setVisible(true); 
    } 
    }); 
} 
} 

Craft.java

import java.awt.image.BufferedImage; 
import java.awt.event.KeyEvent; 

public class Craft { 
private int dx; 
private int dy; 
private int x; 
private int y; 
private BufferedImage image; 

public Craft() { 
    initCraft(); 
} 

private void initCraft() { 
    Painter painter = new Painter(); 
    BufferedImage image = painter.createBufImg("Images/SpriteSheet.png"); 
    x = 40; 
    y = 60; 
} 

public void move() { 
    x += dx; 
    y += dy; 
} 

public int getX() { 
    return x; 
} 

public int getY() { 
    return y; 
} 

public BufferedImage getImage() { 
    return image; 
} 

public void keyPressed(KeyEvent e) { 
    int key = e.getKeyCode(); 

    if (key == KeyEvent.VK_LEFT) { 
    dx = -1; 
    } 

    if (key == KeyEvent.VK_RIGHT) { 
    dx = 1; 
    } 

    if (key == KeyEvent.VK_UP) { 
    dy = -1; 
    } 

    if (key == KeyEvent.VK_DOWN) { 
    dy = 1; 
    } 
} 

public void keyReleased(KeyEvent e) { 
    int key = e.getKeyCode(); 

    if (key == KeyEvent.VK_LEFT) { 
    dx = 0; 
    } 

    if (key == KeyEvent.VK_RIGHT) { 
    dx = 0; 
    } 

    if (key == KeyEvent.VK_UP) { 
    dy = 0; 
    } 

    if (key == KeyEvent.VK_DOWN) { 
    dy = 0; 
    } 
} 
} 

Board.java

import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.Toolkit; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.KeyAdapter; 
import java.awt.event.KeyEvent; 
import javax.swing.JPanel; 
import javax.swing.Timer; 

public class Board extends JPanel implements ActionListener { 
private Timer timer; 
private Craft craft; 
private final int DELAY = 10; 

public Board() { 
    initBoard(); 
} 

private void initBoard() { 
    addKeyListener(new TAdapter()); 
    setFocusable(true); 

    craft = new Craft(); 

    timer = new Timer(DELAY, this); 
    timer.start(); 
} 

@Override 
public void paintComponent(Graphics g) { 
    super.paintComponent(g); 
    doDrawing(g); 
    Toolkit.getDefaultToolkit().sync(); 
} 

private void doDrawing(Graphics g) { 
    Graphics2D g2d = (Graphics2D) g; 
    g2d.drawImage(craft.getImage(), craft.getX(), craft.getY(), this); 
} 

@Override 
public void actionPerformed(ActionEvent e) { 
    craft.move(); 
    repaint(); 
} 

private class TAdapter extends KeyAdapter { 
    @Override 
    public void keyReleased(KeyEvent e) { 
    craft.keyReleased(e); 
    } 

    @Override 
    public void keyPressed(KeyEvent e) { 
    craft.keyPressed(e); 
    } 
} 
} 

Painter.java

import java.io.IOException; 
import java.io.File; 
import java.awt.image.BufferedImage; 
import javax.swing.JPanel; 
import javax.swing.JFrame; 
import javax.imageio.ImageIO; 

public class Painter extends JPanel { 
BufferedImage createBufImg(String filepath) { 
    try { 
    return ImageIO.read(new File(filepath)); 
    } catch (IOException e) { 
    System.out.println("Could not read image"); 
    } 
    return null; 
} 
} 

任何輸入都有幫助！

Answer 1

public class Execute extends JFrame { 
public Execute() { 
    initUI(); 
} 

public void initUI() { 
    // you were creating an entirely different frame here 
    // instead initialize **this** frame 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    setSize(600,600); 
    setTitle("I am the salad baby"); 

    add(new Board()); 
} 
// ... 
}