JFrame中的开关面板

这是一个帮助您的小例子：

import java.awt.*;import java.awt.event.*;import javax.swing.*;public class CardLayoutExample{    private JPanel contentPane;    private MyPanel panel1;    private MyPanel2 panel2;    private void displayGUI()    {        Jframe frame = new Jframe("Card Layout Example");        frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);        JPanel contentPane = new JPanel();        contentPane.setBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5));        contentPane.setLayout(new CardLayout());        panel1 = new MyPanel(contentPane);        panel2 = new MyPanel2(contentPane);        contentPane.add(panel1, "Panel 1");         contentPane.add(panel2, "Panel 2");        frame.setContentPane(contentPane);        frame.pack();frame.setLocationByPlatform(true);        frame.setVisible(true);    }    public static void main(String... args)    {        SwingUtilities.invokeLater(new Runnable()        { public void run() {     new CardLayoutExample().displayGUI(); }        });    }}class MyPanel extends JPanel {    private JButton jcomp4;    private JPanel contentPane;    public MyPanel(JPanel panel)     {        contentPane = panel;        setOpaque(true);        setBackground(Color.RED.darker().darker());        //construct components        jcomp4 = new JButton ("openNewWindow");        jcomp4.addActionListener( new ActionListener()        { public void actionPerformed(ActionEvent e) {     CardLayout cardLayout = (CardLayout) contentPane.getLayout();     cardLayout.next(contentPane); }        });        add(jcomp4);    }    @Override    public Dimension getPreferredSize()    {        return (new Dimension(500, 500));    }}class MyPanel2 extends JPanel {    private JButton jcomp1;    private JPanel contentPane;    public MyPanel2(JPanel panel)     {contentPane = panel;        setOpaque(true);        setBackground(Color.GREEN.darker().darker());        //construct components        jcomp1 = new JButton ("Back");        jcomp1.addActionListener( new ActionListener()        { public void actionPerformed(ActionEvent e) {     CardLayout cardLayout = (CardLayout) contentPane.getLayout();     cardLayout.next(contentPane); }        });        add(jcomp1);    }    @Override    public Dimension getPreferredSize()    {        return (new Dimension(500, 500));    }}

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JPanel

CardLayout

import java.awt.*;import java.awt.event.*;import javax.swing.*;public class CardLayoutExample{    private JPanel contentPane;    private MyPanel panel1;    private MyPanel2 panel2;    private MyPanel2 panel3;    private JComboBox choiceBox;    private String[] choices = {          "Panel 1",          "Panel 2",          "Panel 3"         };    private void displayGUI()    {        Jframe frame = new Jframe("Card Layout Example");        frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);        JPanel contentPane = new JPanel();        contentPane.setBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5));        contentPane.setLayout(new CardLayout());        choiceBox = new JComboBox(choices);        panel1 = new MyPanel(contentPane, this);        panel2 = new MyPanel2(contentPane     , Color.GREEN.darker().darker(), this);        panel3 = new MyPanel2(contentPane     , Color.DARK_GRAY, this);        contentPane.add(panel1, "Panel 1");         contentPane.add(panel2, "Panel 2");        contentPane.add(panel3, "Panel 3");        frame.getContentPane().add(choiceBox, BorderLayout.PAGE_START);        frame.getContentPane().add(contentPane, BorderLayout.CENTER);    frame.pack();frame.setLocationByPlatform(true);        frame.setVisible(true);    }    public JComboBox getChoiceBox()    {        return choiceBox;    }    public static void main(String... args)    {        SwingUtilities.invokeLater(new Runnable()        { public void run() {     new CardLayoutExample().displayGUI(); }        });    }}class MyPanel extends JPanel {    private JButton jcomp4;    private JPanel contentPane;    private JComboBox choiceBox;    public MyPanel(JPanel panel, CardLayoutExample cle)     {        choiceBox = cle.getChoiceBox();        contentPane = panel;        setOpaque(true);        setBackground(Color.RED.darker().darker());        //construct components        jcomp4 = new JButton ("Show New Panel");        jcomp4.addActionListener( new ActionListener()        { public void actionPerformed(ActionEvent e) {     String changeToPanel = (String) choiceBox.getSelectedItem();     CardLayout cardLayout = (CardLayout) contentPane.getLayout();     cardLayout.show(contentPane, changeToPanel); }        });        add(jcomp4);    }    @Override    public Dimension getPreferredSize()    {        return (new Dimension(500, 500));    }}class MyPanel2 extends JPanel {    private JButton jcomp1;    private JPanel contentPane;    private Color backgroundColour;    private JComboBox choiceBox;    public MyPanel2(JPanel panel, Color c, CardLayoutExample cle)     {contentPane = panel;        backgroundColour = c;        choiceBox = cle.getChoiceBox();        setOpaque(true);        setBackground(backgroundColour);        //construct components        jcomp1 = new JButton ("Show New Panel");        jcomp1.addActionListener( new ActionListener()        { public void actionPerformed(ActionEvent e) {     String changeToPanel = (String) choiceBox.getSelectedItem();     CardLayout cardLayout = (CardLayout) contentPane.getLayout();     cardLayout.show(contentPane, changeToPanel); }        });        add(jcomp1);    }    @Override    public Dimension getPreferredSize()    {        return (new Dimension(500, 500));    }}