Java Swing - 如何添加另一个选择 - 第三项

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 = 2;
    int end = 2;
    list.addSelectionInterval(start, end); 
  }
}