JFrame ??? JPanel ?? ??? ??? ? ????

?? ??:

Java ?? ?? ???? ??? ????. JFrame ??? MenuPanel? GamePanel ??? ??? ?. ?? ??? ??? ???? ?? gameOn() ?? ??? ? JFrame? ?????. MenuPanel? ??? ???? ??? ?? ???? ? ??? ???? ?? ??? ?????.

???:

?? ??? ???? ???? ?? ??? ???? ?? , CardLayout? ???? ?? ????. ?? ?? ???? ?? ? ?? ?? ?? ? ??? ??? ?????.

?? ??:

<code class="java">CardLayout cardLayout = new CardLayout();
JPanel mainPanel = new JPanel(cardLayout);

MenuPanel menu = new MenuPanel();
GamePanel game = new GamePanel();
mainPanel.add(menu, "menu");
mainPanel.add(game, "game");

...
public void gameOn() {
    cardLayout.show(mainPanel, "game");
}</code>

??:

• gameOn()? ???? MenuPanel? ?? ?? ??? ??? ????? GamePanel? ??? ??? ?????.

?:

?? ??? ?? ?? ??? ?????.

<code class="java">import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class GameFrame extends JFrame implements ActionListener{

    CardLayout cardLayout;
    JPanel mainPanel;
    MenuPanel menu;
    GamePanel game;

    public GameFrame() {
        cardLayout = new CardLayout();
        mainPanel = new JPanel(cardLayout);
        menu = new MenuPanel();
        game = new GamePanel();
        mainPanel.add(menu, "menu");
        mainPanel.add(game, "game");


        JButton goGame = new JButton("Go TO Game");
        goGame.addActionListener(this);

        add(mainPanel);
        add(goGame, BorderLayout.SOUTH);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setLocationByPlatform(true);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        gameOn();
    }

    public void gameOn() {
        cardLayout.show(mainPanel, "game");
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                GameFrame gameFrame = new GameFrame();
            }
        });
    }
}

class MenuPanel extends JPanel {

    public MenuPanel() {
        setBackground(Color.GREEN);
        add(new JLabel("Menu"));
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(300, 300);
    }
}

class GamePanel extends JPanel {

    public GamePanel() {
        setBackground(Color.BLUE);
        add(new JLabel("Game"));
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(300, 300);
    }
}</code>

? ??? CardLayout? ???? JFrame ??? MenuPanel? GamePanel ??? ???? ???? ??? ?????. .

? ??? ??? ??? ?? ? ????. CardLayout? ???? JFrame?? JPanel? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!