“windowDeiconified”WindowListener在调用后会使用什么命令？

Question

对不起标题！不知道怎么回答这个问题..

我使用命令revalidate()，窗口变得清晰。

如果我想在窗口添加KeyListener我应该放什么？

如果窗口获得windowDeiconified该事件，则KeyListener可以正常工作。

所以我的主要问题是其他代码需要（重新处理）keyListener而不重新打开它？

我应该使用revalidate()而不是重新打开窗口以使我的keyListener工作？

我试图谷歌但我真的不知道如何搜索问题..也没有见过有人在谈论那个......我不知道我在这里缺少什么。

下面是我正在使用的代码和类。

开始上课：

package MainPackage;

import javax.swing.JFrame;

public class Starting_Window {

    public static JFrame frame = new JFrame("The Simple Game By Erick");
    public static GameFrameMenu menuG = new GameFrameMenu();
    public static PlayingClass game;

    public static void main(String[] args) {

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 800/4*3);
        frame.setResizable(false);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
        frame.add(menuG);

    }

}

菜单类：

package MainPackage;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.Timer;

public class GameFrameMenu extends JPanel implements ActionListener {

    public static Timer menuTimer;

    public GameFrameMenu() {
        setFocusable(true);
        setLayout(null);

        color = new Color(rand.nextInt(255),rand.nextInt(255),rand.nextInt(255));

        menuTimer = new Timer(10,this);
        menuTimer.start();

        JButton btnStart = new JButton("Start Game!");
        btnStart.setBounds(285, 180, 200, 40);
        btnStart.setBackground(Color.BLACK);
        btnStart.setForeground(Color.WHITE);
        add(btnStart);

        JButton btnOptions = new JButton("Options!");
        btnOptions.setBounds(285, 240, 200, 40);
        btnOptions.setBackground(Color.BLACK);
        btnOptions.setForeground(Color.WHITE);
        add(btnOptions);

        JButton btnAboutUs = new JButton("About Us!");
        btnAboutUs.setBounds(285, 300, 200, 40);
        btnAboutUs.setBackground(Color.BLACK);
        btnAboutUs.setForeground(Color.WHITE);
        add(btnAboutUs);

        JButton btnExit = new JButton("Exit!");
        btnExit.setBounds(285, 360, 200, 40);
        btnExit.setBackground(Color.BLACK);
        btnExit.setForeground(Color.WHITE);
        add(btnExit);

        /////////////////////////////////////////////////

        btnStart.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {

                Starting_Window.game = new PlayingClass();
                menuTimer.stop();
                Starting_Window.menuG.removeAll();
                Starting_Window.menuG.repaint();
                Starting_Window.frame.repaint();
                Starting_Window.frame.add(Starting_Window.game);
                Starting_Window.game.setFocusable(true);
                Starting_Window.game.repaint();
                Starting_Window.frame.remove(Starting_Window.menuG);
                Starting_Window.frame.revalidate();

            }
        });

        btnOptions.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {



            }
        });

        btnAboutUs.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {



            }
        });

        btnExit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {

                System.exit(0);

            }
        });


    }

    Font HEADER = new Font("Verdana", Font.BOLD, 35);

    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D) g;

        g2d.setFont(HEADER);
        g2d.drawString("The Simple Game Here By Erick ", 90, 145);


        setBackground(color);
        pushTimer();



        drawEffects(g2d);
    }

    public int limiterEffect = 0;

    public void drawEffects(Graphics2D g2d) {

        limiterEffect++;
        if(limiterEffect<15) {
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);
            g2d.setColor(getRandomColor(color));
            g2d.fillOval(rand.nextInt(1000), rand.nextInt(1000), 25, 25);

        }
        if(limiterEffect==30) {
            limiterEffect = 0;
        }


    }

    static int counterTimer = 0, counterTimerDelay = 50;
    static int canDisplay = 0;

    public void pushTimer() {
        counterTimer++;
        if(counterTimer==counterTimerDelay) {
            color = getRandomColor(color);
            counterTimer = 0;
            counterTimerDelay = rand.nextInt(200)+50;
        }
    }

    public Color getRandomColor(Color c) {
        int R,G,B;
        R = rand.nextInt(255);
        G = rand.nextInt(255);
        B = rand.nextInt(255);
        c = new Color(R,G,B);
        return c;
    }

    static Random rand = new Random();
    static Color color;

    @Override
    public void actionPerformed(ActionEvent e) {

        repaint();

    }




}

播放已从MenuClass调用的类：

package MainPackage;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JPanel;
import javax.swing.Timer;

public class PlayingClass extends JPanel implements ActionListener  {

    Timer gameTimer;
    Player player;

    public PlayingClass() {
        setFocusable(true);
        setBackground(new Color(GameFrameMenu.rand.nextInt(255),GameFrameMenu.rand.nextInt(255),GameFrameMenu.rand.nextInt(255)));

        gameTimer = new Timer(10,this);
        gameTimer.start();

        player = new Player(200,200);
        addKeyListener(new KeyAdapt(player));



    }

    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D) g;

        player.draw(g2d);


    }

    @Override
    public void actionPerformed(ActionEvent e) {
        player.update();
        repaint();
    }

}

实体类：

package MainPackage;

import java.awt.Graphics2D;

public class Entity {
    int x, y;

    public Entity(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public void update() {

    }

    public void draw(Graphics2D g2d) {

    }
}

扩展实体类的播放器类：

package MainPackage;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.KeyEvent;

import javax.swing.ImageIcon;

public class Player extends Entity {

    int velY = 0, velX = 0;

    public Player(int x, int y) {
        super(x, y);
    }

    public void update() {
        x += velX;
        y += velY;
    }

    public void draw(Graphics2D g2d) {

        g2d.drawImage(getPlayerImg(), x, y, null);

    }

    public Image getPlayerImg() {
        ImageIcon i = new ImageIcon("C:\\Java Pictures\\baseball pictures\\mini_player.png");
        return i.getImage();
    }

    public void keyPressed(KeyEvent e) {
        System.out.println("Something happened");
    }

    public void keyReleased(KeyEvent e) {

    }

}

最后是KeyAdapt类与Player类的同步（同步）：

    package MainPackage;

    import java.awt.event.KeyAdapter;
    import java.awt.event.KeyEvent;

    public class KeyAdapt extends KeyAdapter {

        Player p;

        public KeyAdapt(Player player) {
            p = player;
        }

        public void keyPressed(KeyEvent e) {
            p.keyPressed(e);
        }

        public void keyReleased(KeyEvent e) {
            p.keyReleased(e);
        }


}

所以这里的问题是，当我按下开始按钮时，屏幕变得清晰，我可以看到在PlayingClass中发生的任何事情，但KeyListener不起作用。为了完成这项工作，我必须最小化和去除窗口，以便启用KeyListener。所以我希望我能更好地解释它，你可以帮助我。