也不太清楚爲什麼我的KeyListener不在這裏工作了

Question

代碼：

public class Panel extends JPanel implements KeyListener{ 
    //variable for coordinates: 
    private final int a1 = 155; 
    private final int a2 = (790-a1); 
    private final int a5 = 47; 
    private boolean gameStarted = false; 
    private int rotated = 0; 
    ArrayList<TetrisBlocks> blocks = new ArrayList<TetrisBlocks>(); 

    public Panel() //constructor 
    { 
     setPreferredSize(new Dimension(1440,790)); //sets the size of the window displayed 
     setBackground(Color.blue); //sets background color to blue (of the JPanel) 
     setLayout(new SpringLayout()); //sets the layout of the text 
     addKeyListener(this); 
     setFocusable(true); 

     //adds text for Game: 
     add(printText("   Horizontal Tetris")); 
     add(printText("                 Score:")); 

     //creates arrayList of Tetris Blocks: 

     for (int i = 0; i <1; i++){ 
      blocks.add(new TetrisBlocks(1)); 
     } 

    } 

    public boolean getValue(){ 
     return gameStarted; 
    } 

    public void paintComponent(Graphics g){ 
     super.paintComponent(g); //overrides the paint method 
     Graphics2D graphicsA = (Graphics2D) g; //creates a new Graphics 2D object 

    } 

    public JLabel printText(String input){ 
     JLabel jlabel1 = new JLabel(input); //create a new label for the text 
     jlabel1.setFont(new Font("Verdana",Font.BOLD,40)); //set font type and size 
     return jlabel1; //return statement for the method 
    } 

    public void AutomaticMove(){ 
     int x = 1; 
     while (x <= 6){ 
      repaint(); 
      if (rotated == 1 || rotated == 3){ 
       blocks.get(0).MoveY(); 
      } else{ 
       blocks.get(0).MoveX(); 
      } 
      x+=1; 
      try { //gives computer a 1 second delay before moving the block again 
       Thread.sleep(500); 
      } catch (InterruptedException e) { //throws and catches the exception when the sleep is interrupted 
       e.printStackTrace(); 
      } 
     } 
    } 

    @Override 
    public void keyTyped(KeyEvent e) { 

     if (e.getKeyCode() == KeyEvent.VK_RIGHT) { 
      System.out.println("Right key typed"); 
     } 
     if (e.getKeyCode() == KeyEvent.VK_LEFT) { 
      System.out.println("Left key typed"); 
     } 

    } 

    @Override 
    public void keyPressed(KeyEvent e) { 

     if (e.getKeyCode() == KeyEvent.VK_RIGHT) { 
      System.out.println("Right key pressed"); 
     } 
     if (e.getKeyCode() == KeyEvent.VK_LEFT) { 
      System.out.println("Left key pressed"); 
     } 

    } 

    @Override 
    public void keyReleased(KeyEvent e) { 
     if (e.getKeyCode() == KeyEvent.VK_RIGHT) { 
      System.out.println("Right key Released"); 
     } 
     if (e.getKeyCode() == KeyEvent.VK_LEFT) { 
      System.out.println("Left key Released"); 
     } 
    } 
} 

一直在嘗試很多不同的東西，但關鍵的聽衆就是不給我在鍵盤上輸入作出響應。任何建議或想法，爲什麼這可能是真實的？我已經在網上嘗試了很多其他來源，但仍然無法弄清楚爲什麼關鍵聽衆不能在我的程序中工作。我的IDE或我的電腦沒有問題，因爲使用keylistener的其他代碼工作得很好。

Answer 1

它工作的很好，但是在你的Automatic Move部分代碼中有問題，當我刪除它的那部分工作時沒有問題。看圖片：

您可以使用此代碼測試：

private final int a1 = 155; 
private final int a2 = (790 - a1); 
private final int a5 = 47; 
private boolean gameStarted = false; 
private int rotated = 0; 
ArrayList<TetrisBlocks> blocks = new ArrayList<TetrisBlocks>(); 

public JTableTest() // constructor 
{ 
    setPreferredSize(new Dimension(1440, 790)); // sets the size of the 
               // window displayed 
    setBackground(Color.blue); // sets background color to blue (of the 
           // JPanel) 
    setLayout(new SpringLayout()); // sets the layout of the text 
    addKeyListener(this); 
    setFocusable(true); 

    // adds text for Game: 
    add(printText("Horizontal Tetris")); 
    add(printText("Score:")); 

    // creates arrayList of Tetris Blocks: 

} 

public boolean getValue() { 
    return gameStarted; 
} 

public void paintComponent(Graphics g) { 
    super.paintComponent(g); // overrides the paint method 
    Graphics2D graphicsA = (Graphics2D) g; // creates a new Graphics 2D 
              // object 

} 

public JLabel printText(String input) { 
    JLabel jlabel1 = new JLabel(input); // create a new label for the text 
    jlabel1.setFont(new Font("Verdana", Font.BOLD, 40)); // set font type 
                  // and size 
    return jlabel1; // return statement for the method 
} 



@Override 
public void keyTyped(KeyEvent e) { 

    if (e.getKeyCode() == KeyEvent.VK_RIGHT) { 
     System.out.println("Right key typed"); 
    } 
    if (e.getKeyCode() == KeyEvent.VK_LEFT) { 
     System.out.println("Left key typed"); 
    } 

} 

@Override 
public void keyPressed(KeyEvent e) { 

    if (e.getKeyCode() == KeyEvent.VK_RIGHT) { 
     System.out.println("Right key pressed"); 
    } 
    if (e.getKeyCode() == KeyEvent.VK_LEFT) { 
     System.out.println("Left key pressed"); 
    } 

} 

@Override 
public void keyReleased(KeyEvent e) { 
    if (e.getKeyCode() == KeyEvent.VK_RIGHT) { 
     System.out.println("Right key Released"); 
    } 
    if (e.getKeyCode() == KeyEvent.VK_LEFT) { 
     System.out.println("Left key Released"); 
    } 
} 

public static void main(String[] args) { 
    JTableTest tb = new JTableTest(); 
    JFrame frame = new JFrame(); 
    frame.setPreferredSize(frame.getMaximumSize()); 
    frame.add(tb); 
    frame.setVisible(true); 

}