Java Program using JCheckBox with ActionListener in Java Swing

 

GUI

package Trial;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

class Demo extends JFrame implements ActionListener {

    JButton jb1;
    JCheckBox cb1, cb2, cb3;

    Demo() {
    	setTitle("Hancie e-Learning Studio");
    	 setLayout(null);
         setSize(600, 500);
         setLocationRelativeTo(null);

        cb1 = new JCheckBox("Bhadrapur");
        cb1.setBounds(50, 30, 150, 30);
        add(cb1);

        cb2 = new JCheckBox("Kathamandu");
        cb2.setBounds(50, 60, 150, 30);
        add(cb2);

        cb3 = new JCheckBox("Pokhara");
        cb3.setBounds(50, 90, 150, 30);
        add(cb3);

        jb1 = new JButton("Click");
        jb1.setBounds(50, 200, 100, 30);
        add(jb1);

        jb1.addActionListener(this);

       
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String country = "";

        if (cb1.isSelected()) {
            country = country + "Bhadrapur\n";
        }

        if (cb2.isSelected()) {
            country = country + "Kathamandu\n";
        }

        if (cb3.isSelected()) {
            country = country + "Pokhara\n";
        }

        JOptionPane.showMessageDialog(this, country);

    }

    public static void main(String args[]) {
        new Demo();
    }
}

Output