//PROGRAM 13-5
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class DemoCheckBox implements ItemListener {
  public JLabel label1;
  public JCheckBox checkBox1, checkBox2, checkBox3;
  private JFrame frame;
	
  public DemoCheckBox() {			
    label1 = new JLabel("Pilihan:");
    label1.setLocation(10, 10);
    label1.setSize(label1.getPreferredSize());	
		
    checkBox1 = new JCheckBox("C", true);
    checkBox1.setLocation(10, 25);
    checkBox1.addItemListener(this);
    checkBox1.setSize(checkBox1.getPreferredSize());
    
    checkBox2 = new JCheckBox("C++", true);
    checkBox2.setLocation(10, 50);
    checkBox2.addItemListener(this);
    checkBox2.setSize(checkBox2.getPreferredSize());
    
    checkBox3 = new JCheckBox("Java", true);
    checkBox3.setLocation(10, 75);
    checkBox3.addItemListener(this);		
    checkBox3.setSize(checkBox3.getPreferredSize());    
  }

  public void createAndShowGUI() {
    JFrame.setDefaultLookAndFeelDecorated(true);
    frame = new JFrame("Demo JCheckBox");
    frame.setLayout(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(label1);
    frame.getContentPane().add(checkBox1);
    frame.getContentPane().add(checkBox2);
    frame.getContentPane().add(checkBox3);

    frame.setBounds(0, 0, 300, 200);
    frame.setLocationRelativeTo(null);

    frame.setVisible(true);
  }
	
  public void itemStateChanged(ItemEvent event) {
    JCheckBox cb = (JCheckBox) event.getSource();
	  
    if (event.getStateChange() == ItemEvent.SELECTED) {
      JOptionPane.showMessageDialog(frame, 
  	  "Anda telah memilih: " + cb.getText());
    } else {
      JOptionPane.showMessageDialog(frame, 
	  "Anda telah telah melepas pilihan: " + cb.getText());
    }	  
  }
	
  public static void main(String[] args) {		
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        DemoCheckBox app = new DemoCheckBox();
        app.createAndShowGUI();
      }
    });		
  }	
}