import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
public class CheckBoxFrame extends JFrame{
    private JTextField textField;
    private JCheckBox boldJCheckBox;
    private JCheckBox italicJCheckBox;

    public CheckBoxFrame(){
        super("JCheckBox Test");
        setLayout(new FlowLayout());

        textField = new JTextField("Watch the font style change",20);
        textField.setFont(new Font("Serif",Font.PLAIN , 14));
        add(textField);

        boldJCheckBox = new JCheckBox ("Bold");
        italicJCheckBox = new JCheckBox("Italic");
        add(italicJCheckBox);
        add(boldJCheckBox);

        CheckBoxHandler handler = new CheckBoxHandler();
        boldJCheckBox.addItemListener((ItemListener) handler);
        italicJCheckBox.addItemListener((ItemListener) handler);

    }
    private class CheckBoxHandler implements ItemListener {
        public void itemStateChanged( ItemEvent event ){
            Font font = null;
            if (boldJCheckBox.isSelected() && italicJCheckBox.isSelected())
                font = new Font ( "Serif ", Font.BOLD + Font.ITALIC, 14);
            else if (boldJCheckBox.isSelected())
                font = new Font("Serif", Font.BOLD, 14);
            else if (italicJCheckBox.isSelected())
                font = new Font ("Serif", Font.ITALIC, 14);
            else
                font = new Font ("Serif", Font.PLAIN, 14);

            textField.setFont(font);
        }


    }
}