Using CheckBox ActionListener to controll font : CheckBox Button « Swing JFC « Java

Using CheckBox ActionListener to controll font

   This program is a part of the companion code for Core Java 8th ed.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <>.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

 * @version 1.33 2007-06-12
 * @author Cay Horstmann
public class CheckBoxTest
   public static void main(String[] args)
      EventQueue.invokeLater(new Runnable()
            public void run()
               CheckBoxFrame frame = new CheckBoxFrame();

 * A frame with a sample text label and check boxes for selecting font attributes.
class CheckBoxFrame extends JFrame
   public CheckBoxFrame()

      // add the sample text label

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

      // this listener sets the font attribute of
      // the label to the check box state

      ActionListener listener = new ActionListener()
            public void actionPerformed(ActionEvent event)
               int mode = 0;
               if (bold.isSelected()) mode += Font.BOLD;
               if (italic.isSelected()) mode += Font.ITALIC;
               label.setFont(new Font("Serif", mode, FONTSIZE));

      // add the check boxes

      JPanel buttonPanel = new JPanel();

      bold = new JCheckBox("Bold");

      italic = new JCheckBox("Italic");

      add(buttonPanel, BorderLayout.SOUTH);

   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 200;

   private JLabel label;
   private JCheckBox bold;
   private JCheckBox italic;

   private static final int FONTSIZE = 12;


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