java combobox 多选框

简介

简单

code

package calcu;

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

public class ComboBoxFrame extends JFrame {
    private JComboBox<String> faceCombo;
    private JLabel label;
    private static final int DEFAULT_SIZE = 24;

    public static void main(String[] args) {
        ComboBoxFrame t = new ComboBoxFrame();
        t.setTitle("ImageTest");
        t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        t.setVisible(true);
    }

    public ComboBoxFrame() {
        label = new JLabel("The qucik 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 add 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(event -> 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();
    }

}