的鍵偵聽器工作不正常

Question

我所做的卡布局工作完全正常，但現在發生了什麼事是我添加了一個KeyListener的到這是一個JLabel對象字符所以每當人按下的字符應該向上移動，但它絕對不會沒有！

我也試圖與一個按鈕，點擊它和它的工作完全正常，當移動它取代它。此外，我試圖改變事件意味着我改變，如果他們按了那麼城鎮地圖的圖像會改變，但仍然沒有效果，因此似乎有一個與我的KeyListener不對勁

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.KeyEvent; 
import java.awt.event.KeyListener; 
import java.awt.*; 
import javax.swing.*; 


@SuppressWarnings({ "unused", "serial" }) 
public class FinalBlowzXC extends JFrame implements KeyListener{ 

    public static JPanel game=new JPanel(); 
    public static JPanel mainmenu=new JPanel(null); 
    public static JPanel loginpanel=new JPanel(null); 
    public static JPanel tutorial=new JPanel(null); 
    public static JPanel registration=new JPanel(null); 
    public static JPanel town_map=new JPanel(null); 
    public JTextField username= new JTextField("Username"); 
    public JTextField password=new JTextField("Password"); 
    public JLabel bglogin=new JLabel(); 
    public JLabel character=new JLabel(); 
    public JButton log_in=new JButton(); 
    public JButton register=new JButton(); 
    CardLayout page= new CardLayout(); 
    public String level=""; 
    public int charx=350; 
    public int chary=435; 

    public static void main(String []args) 
    { 
     new FinalBlowzXC().setVisible(true); 
    } 

    public FinalBlowzXC() 
    { 
     super("Final Blowz Xchanged"); 
     setSize(640,510); 
     setResizable(false); 
     setDefaultCloseOperation(EXIT_ON_CLOSE); 

     game.setLayout(page); 
     game.add(mainmenu, "1"); 
     game.add(loginpanel, "2"); 
     game.add(tutorial, "3"); 
     game.add(registration, "4"); 
     game.add(town_map, "5"); 
     add(game); 
     opening(); 
    } 

     public void opening() 
     { 
      page.show(game, "1"); 
      JLabel bgmainmenu; 
      JButton start; 
      JButton exit; 
      bgmainmenu = new JLabel(); 
      start = new JButton(); 
      exit = new JButton(); 

      bgmainmenu.setIcon(new ImageIcon(getClass().getResource("/FF-XV.jpg"))); 
      bgmainmenu.setBounds(0,0,640,480); 
      mainmenu.add(bgmainmenu); 
      mainmenu.add(start); 
      start.setBounds(280, 360, 70, 20); 
      start.setBorder(null); 
      start.setBorderPainted(false); 
      start.setContentAreaFilled(false); 
      start.setOpaque(false); 
      start.addActionListener(new Start()); 
      exit.setBounds(280, 385, 70, 20); 
      mainmenu.add(exit); 
      exit.setBorder(null); 
      exit.setBorderPainted(false); 
      exit.setContentAreaFilled(false); 
      exit.setOpaque(false); 
      exit.addActionListener(new ActionListener() { 
       public void actionPerformed(ActionEvent e) 
       { 
        System.exit(0); 
       } 
      }); 
     } 


     class Start implements ActionListener{ 

     public void actionPerformed(ActionEvent e) {  
       login(); 

     } 

    } 

     public void login() 
     { 
      page.show(game, "2"); 

      bglogin.setIcon(new ImageIcon(getClass().getResource("/FF-XV Login.jpg"))); 
      bglogin.setBounds(0, 0, 640, 480); 


      username.setBounds(300, 285, 85, 15); 
      username.setBorder(null); 
      username.setForeground(Color.WHITE); 
      username.setOpaque(false); 

      password.setBounds(300, 310, 85, 20); 
      password.setBorder(null); 
      password.setForeground(Color.WHITE); 
      password.setOpaque(false); 

      log_in.setBounds(280, 335, 50, 45); 
      log_in.setBorder(null); 
      log_in.setBorderPainted(false); 
      log_in.setContentAreaFilled(false); 
      log_in.setOpaque(false); 
      log_in.addActionListener(new Log_in()); 

      register.setBounds(335, 335, 55, 45); 
      register.setBorder(null); 
      register.setBorderPainted(false); 
      register.setContentAreaFilled(false); 
      register.setOpaque(false); 
      register.addActionListener(new Register()); 

      loginpanel.add(username); 
      loginpanel.add(password); 
      loginpanel.add(bglogin); 
      loginpanel.add(log_in); 
      loginpanel.add(register); 
     } 

     class Log_in implements ActionListener{ 

      public void actionPerformed(ActionEvent e) 
      { 
       Tutorial(); 

      } 

     } 

     class Register implements ActionListener{ 

      public void actionPerformed(ActionEvent e) 
      { 
       page.show(game, "4"); 
      } 
     } 

     public void Tutorial() 
     { 
      page.show(game, "3"); 
      JLabel bgtutorial=new JLabel(); 
      JLabel animeforward=new JLabel(); 
      JLabel animeright=new JLabel(); 
      JLabel animeleft=new JLabel(); 
      JButton next=new JButton(); 
      JLabel animebackward=new JLabel(); 
      bgtutorial.setIcon(new ImageIcon(getClass().getResource("/FF-XV Tutorial.jpg"))); 
      bgtutorial.setBounds(0, 0, 640, 480); 
      animeforward.setIcon(new ImageIcon(getClass().getResource("walkanimofficialfront.gif"))); 
      animeforward.setBounds(115, 230, 30, 30); 
      animeright.setIcon(new ImageIcon(getClass().getResource("walkanimofficialright.gif"))); 
      animeright.setBounds(190, 315, 30, 30); 
      animeleft.setIcon(new ImageIcon(getClass().getResource("walkanimofficialleft.gif"))); 
      animeleft.setBounds(45, 315, 30, 30); 
      animebackward.setIcon(new ImageIcon(getClass().getResource("walkanimofficialback.gif"))); 
      animebackward.setBounds(115, 405, 30, 30); 
      next.setBounds(530, 430, 100, 30); 
      next.setBorder(null); 
      next.setBorderPainted(false); 
      next.setContentAreaFilled(false); 
      next.setOpaque(false); 
      next.addActionListener(new Next()); 
      tutorial.add(next); 
      tutorial.add(animeright); 
      tutorial.add(animeleft); 
      tutorial.add(animebackward); 
      tutorial.add(animeforward); 
      tutorial.add(bgtutorial); 

     } 

     class Next implements ActionListener{ 

      public void actionPerformed(ActionEvent e) 
      { 
       town(); 
      } 
     } 

     public void town() 
     { 
      page.show(game, "5"); 
      JLabel map=new JLabel(); 
      map.setIcon(new ImageIcon(getClass().getResource("/FF-XV Town.jpg"))); 
      map.setBounds(0, 0, 640, 480); 
      character.setIcon(new ImageIcon(getClass().getResource("standfront.png"))); 
      character.setBounds(charx, chary, 30, 35); 
      town_map.add(character); 
      town_map.add(map); 

     } 


     public void keyPressed(KeyEvent e) { 
      if(e.getKeyCode()==KeyEvent.VK_UP) 
      { 
       character.setIcon(new ImageIcon(getClass().getResource("walkanimofficialfront.gif"))); 
       character.setLocation(character.getX(), character.getY()+5); 
      } 

      if(e.getKeyCode()==KeyEvent.VK_RIGHT) 
      { 
       character.setIcon(new ImageIcon(getClass().getResource("walkanimofficialright.gif"))); 
       character.setLocation(character.getX()+5, character.getY()); 
      } 

      if(e.getKeyCode()==KeyEvent.VK_LEFT) 
      { 
       character.setIcon(new ImageIcon(getClass().getResource("walkanimofficialleft.gif"))); 
       character.setLocation(character.getX()-5, character.getY()+5); 
      } 

      if(e.getKeyCode()==KeyEvent.VK_DOWN) 
      { 
       character.setIcon(new ImageIcon(getClass().getResource("walkanimofficialback.gif"))); 
       character.setLocation(character.getX(), character.getY()-5); 
      } 

     } 


     public void keyReleased(KeyEvent e) { 


     } 

     public void keyTyped(KeyEvent e) { 


     } 
} 

Answer 1

似乎還有我的KeyListener出現問題

KeyEvent僅爲具有焦點的組件生成。 JLabel默認情況下不可聚焦，因此它永遠不會收到任何事件。

不要使用KeyListener的。

相反，你應該使用Key Bindings。

用於工作使用Key Bindings，你想要做什麼的例子見Motion Using the Keyboard。