The following code creates a choice menu with 100 items.  On Solaris, when I pop up the menu, it just shows the first N entries that fit on the screen.  On NT I get a menu with a scroll bar so all choices are accessible.

Here is an example piece of code:

public class TestChoice extends Frame 
{
        Label label = new Label ("Try to select Choice 89:");
        Choice bigChoice = new Choice();
 
        public TestChoice() {
                super("Show Unusable Choice");
 
                for (int i=0; i<100; i++) 
                        bigChoice.add("Choice " + i);
 
                setLayout(new GridBagLayout());
                add(label);
                add(bigChoice);
                pack();
                setVisible(true);
        }
 
        public static void main(String[] args) {
                new TestChoice();
        }
}