CheckBox

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
//******************************************************
public class RadioCheckNew extends Applet {
  TextField t = new TextField(30);
  Checkbox[] cb = {
    new Checkbox("Check Box 1"),
    new Checkbox("Check Box 2"),
    new Checkbox("Check Box 3") };
  CheckboxGroup g = new CheckboxGroup();
  Checkbox 
    cb4 = new Checkbox("four", g, false),
    cb5 = new Checkbox("five", g, true),
    cb6 = new Checkbox("six", g, false);

//******************************************************
  public void init() {
    t.setEditable(false);
    add(t); 
    ILCheck il = new ILCheck();
    for(int i = 0; i < cb.length; i++) {
      cb[i].addItemListener(il);
      add(cb[i]);
    }
    cb4.addItemListener(new IL4());
    cb5.addItemListener(new IL5());
    cb6.addItemListener(new IL6());
    add(cb4); add(cb5); add(cb6); 
  }

//******************************************************
  // Checking the source:
  class ILCheck implements ItemListener {
    public void itemStateChanged(ItemEvent e) {
      for(int i = 0; i < cb.length; i++) {
        if(e.getSource().equals(cb[i])) {
          t.setText("Check box " + (i + 1));
          return;
        }
      }
    }
  }

//******************************************************
  // vs. an individual class for each item:
  class IL4 implements ItemListener {
    public void itemStateChanged(ItemEvent e) {
      t.setText("Radio button four");
    }
  }

//******************************************************
  class IL5 implements ItemListener {
    public void itemStateChanged(ItemEvent e) {
      t.setText("Radio button five");
    }
  }

//******************************************************
  class IL6 implements ItemListener {
    public void itemStateChanged(ItemEvent e) {
      t.setText("Radio button six");
    }
  }

//******************************************************
  public static void main(String[] args) {
     RadioCheckNew applet = new RadioCheckNew();
     Frame aFrame = new Frame("RadioCheckNew");
     aFrame.addWindowListener(
             new WindowAdapter() {
                 public void windowClosing(WindowEvent e) {
                     System.exit(0);
                }
              }

    );
    aFrame.add(applet, BorderLayout.CENTER);
    aFrame.setSize(300,200);
    applet.init();
    applet.start();
    aFrame.setVisible(true);
  }

//******************************************************
}