package checkboxtest;
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);

    add(textField);

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

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

    }
}