avlitem.java

真的很麻烦也

public class AVLItem extends Item  {
  int height;
  AVLItem(Object k, Object e, int h)  {
    super(k, e);
    height = h;
  }
  public int height()  { return height; }
  public int setHeight(int h)  {
    int oldHeight = height;
    height = h;
    return oldHeight;
  }
}