Java – how to change UI based on combo box selection

In the dialog box, if a combination is selected, one group of controls needs to be displayed, otherwise another group of controls will be displayed

thank you

Solution

CardLayout applies to this, as shown below

import java.awt.BorderLayout;
import java.awt.cardlayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JCombo@R_482_2419@;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/** @see https://stackoverflow.com/questions/6432170 */
public class CardPanel extends JPanel {

    private static final Random random = new Random();
    private static final JPanel cards = new JPanel(new cardlayout());
    private static final JCombo@R_482_2419@ combo = new JCombo@R_482_2419@();
    private final String name;

    public CardPanel(String name) {
        this.name = name;
        this.setPreferredSize(new Dimension(320,240));
        this.setBackground(new Color(random.nextInt()));
        this.add(new JLabel(name));
    }

    @Override
    public String toString() {
        return name;
    }

    public static void main(String[] args) {
        EventQueue.invokelater(new Runnable() {

            @Override
            public void run() {
                create();
            }
        });
    }

    private static void create() {
        JFrame f = new JFrame();
        f.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        for (int i = 1; i < 9; i++) {
            CardPanel p = new CardPanel("Panel " + String.valueOf(i));
            combo.addItem(p);
            cards.add(p,p.toString());
        }
        JPanel control = new JPanel();
        combo.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                JCombo@R_482_2419@ jcb = (JCombo@R_482_2419@) e.getSource();
                cardlayout cl = (cardlayout) cards.getLayout();
                cl.show(cards,jcb.getSelectedItem().toString());
            }
        });
        control.add(combo);
        f.add(cards,BorderLayout.CENTER);
        f.add(control,BorderLayout.soUTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}