import java.awt.event.*;import java.awt.*;
 
import javax.swing.*;/**
 
*
 
* @author ahmedabdelaliem
 
*/
 
//we create the Handler class and implement from ActionListener interface
 
public class Handler implements ActionListener{
 
//now we overwrite the abstract method of ActionListener interface
 
public void actionPerformed (ActionEvent event){
 
// here goes the code we want to execute when the action happen, for example show a message dialog with the below text
 
JOptionPane.showMessageDialog(null, "You Have just clicked the button");
 
}
 
}

/** *
 
* @author ahmedabdelaliem
 
*/
 
/*
 
* To change this template, choose Tools | Templates
 
* and open the template in the editor.
 
*/
 
import java.awt.*;
 
import javax.swing.*;// we create our class and inherit from JFrame to create our GUI
 
public class ButtonTest extends JFrame{
 
// we create an empty reference with JButton type
 
private JButton plainButton,;
 
// we create the constructor of the class
 
public ButtonTest(){
 
//set up the container
 
Container con = getContentPane();
 
con.setLayout(new FlowLayout());
 
// create an object of the JButton
 
plainButton = new JButton();
 
plainButton.setText("Regular Button"); // set the text on the button
 
//create an object of our Handler
 
Handler h = new Handler();
 
// now we add the Handler object we created as Action Listener for the button
 
plainButton.addActionListener(h);
 
//now we add the button to the container and show the frame.
 
con.add(plainButton);
 
setSize(400,300);
 
setVisible(true);
 
}
 
}

/** *
 
* @author ahmedabdelaliem
 
*/
 
public class Main {
 
public static void main(String[] args) {
 
// we create an object of our ButtonTest Class
 
ButtonTest b1 = new ButtonTest();
 
b1.setDefaultCloseOperation(b1.EXIT_ON_CLOSE);    }
 
}

import javax.swing.*;import java.awt.*;
 
import java.awt.event.*;
 
/**
 
*
 
* @author ahmedabdelaliem
 
*/
 
public class CheckBoxTest extends JFrame{
 
JCheckBox b1,b2; // we create 2 referneces with JCheckBox type
 
JTextField t1; // we create 1 reference with JTextField type    // we create the constructor of the class
 
public CheckBoxTest() {
 
//we call the constructor of our super class and give it the title of the frame
 
super ("Check Box Test");
 
//now we setup the container
 
Container con = getContentPane();
 
con.setLayout(new FlowLayout());
 
// we create the text field object with pre entered text
 
t1 = new JTextField("This is the test text");
 
// we set the font for the text field
 
t1.setFont( new Font("serif", Font.PLAIN, 14));
 
// now we add the text box to the container
 
con.add(t1);
 
// we create object for the checkbox and give it Bold value
 
b1 = new JCheckBox("Bold");
 
//we add the checkbox to the container
 
con.add(b1);
 
// we create another object for the second box and give it italic value
 
b2 = new JCheckBox("Italic");
 
// we add the checkbox to the container
 
con.add(b2);
 
// now we create the handler object
 
Handler h = new Handler();
 
// we add the handler as item listener for the 2 checkboxes
 
b1.addItemListener(h);
 
b2.addItemListener(h);
 
// now we view the frame
 
setSize(400,300);
 
setVisible(true);
 
}
 
// here we create the handler class   as inner class
 
private class Handler implements ItemListener{
 
private int bold = Font.PLAIN; // we setup initial values for the bold, italic variables
 
private int italic = Font.PLAIN;
 
// we overwrite the abstract method of the ItemListener interface
 
public void itemStateChanged(ItemEvent event){
 
if (event.getSource() == b1){ // here we check which checkbox is checked
 
if (event.getStateChange() == event.SELECTED){ // here we check if it is selected or the selection is removed
 
bold = Font.BOLD; // if conditions apply, we set the bold variable as BOLD
 
//t1.set;
 
}else{
 
bold = Font.PLAIN;
 
}
 
}else if (event.getSource() == b2){
 
if (event.getStateChange() == event.SELECTED){
 
italic = Font.ITALIC;
 
}else{
 
italic = Font.PLAIN;
 
}
 
}
 
// here we add the 2 variables and apply the format to our font
 
t1.setFont(new Font("Serif", bold + italic, 14));
 
}
 
}
 
}

/**
 
 *
 
 * @author ahmedabdelaliem
 
 */
 
public class Main {    /**
 
     * @param args the command line arguments
 
     */
 
        // TODO code application logic here
 
        public static void main(String[] args) {
 
        // TODO code application logic here
 
       CheckBoxTest checkBox = new CheckBoxTest();
 
       checkBox.setDefaultCloseOperation(CheckBoxTest.EXIT_ON_CLOSE);
 
    }
 
}