Key Listener 工作不正常

Question

我让 Card Layout 工作得很好，但现在发生的是我向对象角色添加了一个 keylistener，它是一个 JLabel，所以每当人按下时，角色应该向上移动，但它什么也没做！

我也尝试用一个按钮替换它，点击它时它会移动，而且效果很好。我还尝试更改事件，这意味着我更改了如果他们向上按，那么城镇地图的图像会改变但仍然没有效果所以我的 KeyListener 似乎有问题

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

it seems there is something wrong with my KeyListener

只为具有焦点的组件生成 KeyEvent。默认情况下，JLabel 不可聚焦，因此它永远不会接收任何事件。

不要使用 KeyListener。

您应该使用 Key Bindings。

请参阅 Motion Using the Keyboard 了解使用 Key Bindings 的工作示例，它完全符合您的要求。

Key Listener 工作不正常

The Key Listener Is not working properly

java

swing

awt

keylistener