The firstVisibleIndex and lastVisibleIndex properties allow you to find out which choices are currently visible.
To request that a specific element be made visible, use the public void ensureIndexIsVisible(int index) method.
import java.awt.BorderLayout;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
public class SizingSamples {
public static void main(String args[]) {
JFrame frame = new JFrame("Sizing Samples");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultListModel model = new DefaultListModel();
model.ensureCapacity(100);
for (int i = 0; i < 100; i++) {
model.addElement(Integer.toString(i));
}
JList jlist2 = new JList(model);
JScrollPane scrollPane2 = new JScrollPane(jlist2);
frame.add(scrollPane2, BorderLayout.CENTER);
frame.setSize(300, 350);
frame.setVisible(true);
jlist2.ensureIndexIsVisible(50);
}
}