import javax.swing.JList;
public class Main {
public static void main(String[] argv) throws Exception {
String[] items = { "A", "B", "C", "D" };
JList list = new JList(items);
int start = 0;
int end = list.getModel().getSize() - 1;
if (end >= 0) {
list.setSelectionInterval(start, end);
}
}
}