CardLayout is an AWT layout.

Something like this might get you started..

<sscce>
import java.awt.*;

public class TestCardLayout extends Panel {

 CardLayout cl;
 int num = 10;
 Label[] label;

 public TestCardLayout () {
   super();
   cl = new CardLayout();
   setLayout( cl );
   label = new Label[num];
   for (int ii=0; ii<num; ii++) {
     String s = "label " + (ii+1);
     label[ii] = new Label( s );
     this.add( label[ii], s );
     System.out.println( "ii: " + ii + " \tstring: " + s );
   }
   cl.next( this );

   cl.show( this, "label 5" );
   System.out.println( "The index of the visible component is "
     + getVisibleComponent() );
 }

 public int getVisibleComponent() {
   int i = 0;
   while (i<num) {
     if ( label[i].isVisible() ) return i;
     else i++;
   }
   return -1;
 }

 public static void main(String[] args) {
   Frame f = new Frame("Test Card Layout");
   f.setLayout(new BorderLayout());
   f.add( new TestCardLayout(), BorderLayout.CENTER );
   f.pack();
   f.setSize( f.getPreferredSize() );
   f.setVisible(true);
 }
}
</sscce>

HTH

The easiest way is to do your own counting, which is rather simple. Give
the card names, and forget about next(), previous() and just use show().

But if you really want to query the setup via the Java API, then the
only way I am aware of is rather ugly:

    JPanel panel = ...
    ...
    for(int i = 0; i < panel.getComponentCount(); i++) {
        if(panel.getComponent(i).isVisible()) {
            //
            // found currently shown component
            // ...
        }
    }

/Thomas

http://groups.google.com/groups?hl=de&lr=&frame=right&th=b191417de497efba&seekm=
1t3e416085i7d73n1f4%40simia.chka.de#link1

Christian