5. The JCheckBox example

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      checkBox = new JCheckBox( "check label", false );
      checkBox.addItemListener(
          // using anonymous class without a name
          new java.awt.event.ItemListener()
          {
              // method executes when status of the check box changes:
              public void itemStateChanged( java.awt.event.ItemEvent evt ) {
                  JCheckBox source = ( JCheckBox ) evt.getItemSelectable();
              
                  if ( source == checkBox ) {
                      System.out.println( "box" + source.isSelected() );
                  }
              }//itemStateChanged
          }//anonymous class
      );
      frame.getContentPane().add(checkBox);