//
// another example of the Java AWT, showing use of Choice class.
// see class definition and main method for details.
//
import java.awt.* ;
import java.awt.event.* ;

//
// a ChoiceExample object is a CloseableFrame containing a Choice
//      and a Label.  when the user makes a selection, the index of
//      the current selection is displayed in the Label.  (we could
//      also display its text, but that's already on the screen in
//      the Choice itself, so for variety .... )
//
class ChoiceExample extends CloseableFrame implements ItemListener {

        Choice c ;
        Label display ;

        ChoiceExample(String[] items) {

                super("ChoiceExample") ;

                c = new Choice() ;

                display = new Label("", Label.CENTER) ;
                setDisplay() ;

                for (int i = 0 ; i < items.length ; i++) 
                        c.add(items[i]) ;

                c.addItemListener(this) ;

                setLayout(new GridLayout(0, 1)) ;
                add(c) ;
                add(display) ;

                pack() ;
                show() ;

        }

        // invoked when user makes a selection.
        public void itemStateChanged(ItemEvent e) {
                setDisplay() ;
        }

        // displays index of current selection.
        private void setDisplay() {
                display.setText("selected item at index " +
                        c.getSelectedIndex()) ;
        }

        //
        // ---- main ---------------------------------------------------
        //
        // command-line arguments are elements in Choice.
        //
        public static void main(String[] args) {

                if (args.length < 1) {
                        System.out.println("Arguments are items") ;
                        System.exit(-1) ;
                }

                ChoiceExample c = new ChoiceExample(args) ;
        }
}