this.index0 = index0; this.index1 = index1;
this.index0 = Math.min(index0, index1); this.index1 = Math.max(index0, index1);
  public ListDataEvent(Object source, int type, int index0, int index1)  {    super(source);    this.type = type;    this.index0 = index0;    this.index1 = index1;  }