利用复选框控制字体格式

package swing;

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;

public class CheckBoxTest {
 public static void main(String[] args) {
  EventQueue.invokeLater(new Runnable() {
   @Override
   public void run() {
    CheckBoxFrame frame = new CheckBoxFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
   }
  });
 }
}

class CheckBoxFrame extends JFrame {
 public CheckBoxFrame() {
  this.setTitle("CheckBox Test");
  this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
  
  label = new JLabel("The quick brown fox jumps over the lazy dog.");
  label.setFont(new Font("Serif", Font.PLAIN, FONTSIZE));
  this.add(label, BorderLayout.CENTER);
  
  ActionListener listener = new ActionListener() {
   @Override
   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));
   }
  };
  
  JPanel buttonPanel = new JPanel();
  
  bold = new JCheckBox("Bold");
  bold.addActionListener(listener);
  buttonPanel.add(bold);
  
  italic = new JCheckBox("Italic");
  italic.addActionListener(listener);
  buttonPanel.add(italic);
  
  this.add(buttonPanel, BorderLayout.SOUTH);
 }
 
 public static final int DEFAULT_WIDTH = 400;
 public static final int DEFAULT_HEIGHT = 200;
 
 private JLabel label;
 private JCheckBox bold;
 private JCheckBox italic;
 
 private static final int FONTSIZE = 12;
}