Java Swing - 如何确定是否选择了第三项目

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 index = 2;
    boolean isSel = list.isSelectedIndex(index);
  }
}