Just adding a parameter to the Constructor

House.java

public class House {
  private int houseBedrooms;
  private int houseBathrooms;
  private int houseSquareFeet;
  private int houseWindows; // added!
  private String houseName;

  public House( int _i, String _s, int _i2, int _i3, int _windows ){
    houseBedrooms = _i;
    houseName = _s;
    houseBathrooms = _i2;
    houseSquareFeet = _i3;
    houseWindows = _windows; // added!
  }
  
  /**
   * Returns the dollar value of the House.
   */
  public int appraise(){
    return houseBedrooms * houseBathrooms * houseSquareFeet * houseWindows; // added!
  }
}