Java Swing - 如何获取最后一个可见项的索引

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 itemIx = list.getLastVisibleIndex();
  }
}