ComboBoxFrame.java

package comboBox;

import javax.swing.*;
import java.awt.*;

/**
 * A frame with a sample text label and a combo box for selecting font faces.
 */
public class ComboBoxFrame extends JFrame {
    private static final int DEFAULT_SIZE = 24;
    private JComboBox<String> faceCombo;
    private JLabel label;

    public ComboBoxFrame() {
        // add the sample text label

        label = new JLabel("The quick brown fox jumps over the lazy dog");
        label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
        add(label, BorderLayout.CENTER);

        // make a combo box and face names

        faceCombo = new JComboBox<>();
        faceCombo.addItem("Serif");
        faceCombo.addItem("SansSerif");
        faceCombo.addItem("Monospaced");
        faceCombo.addItem("Dialog");
        faceCombo.addItem("DialogInput");

        // the combo box listener changes the label font to the selected face name

        faceCombo.addActionListener(e -> label.setFont(new Font(faceCombo.getItemAt(
                faceCombo.getSelectedIndex()), Font.PLAIN, DEFAULT_SIZE)
        ));

        // add combo box to a panel at the frame's southern border

        JPanel comboPanel = new JPanel();
        comboPanel.add(faceCombo);
        add(comboPanel, BorderLayout.SOUTH);
        pack();
    }
}