checkboxgrouptest.java

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import  java.applet.Applet;
import  java.awt.*;
import  java.awt.event.*;
public class CheckboxGroupTest extends Applet implements ItemListener
{
   CheckboxGroup optGroup; 
   Checkbox opt1, opt2, opt3;
    public  void  init( )
   {  
      optGroup = new  CheckboxGroup();
      opt1 = new  Checkbox( "选项1",optGroup, false );
      opt1.addItemListener( this );
      add( opt1 );
      opt2 = new  Checkbox( "选项2",optGroup, false );
      opt2.addItemListener( this );
      add( opt2 );
      opt3 = new  Checkbox( "选项3",optGroup, false );
      opt3.addItemListener( this );
      add( opt3 );
   }
   public  void  itemStateChanged( ItemEvent e )
   { 
      if ( e.getSource() == opt1 )
      { 
        opt1.setVisible(false);
        opt2.setVisible(true);
        opt3.setVisible(true);
      }
      if ( e.getSource() == opt2 )
      {
        opt2.setVisible(false);
        opt1.setVisible(true);
        opt3.setVisible(true); 
      }
      if ( e.getSource() == opt3 )
      { 
        opt3.setVisible(false);
        opt1.setVisible(true);
        opt2.setVisible(true); 
      }
      repaint();
   }
}