House                         []
    mostBuildings              = new
    House[100000]    ;class    House
    {      double    x,y,z;    House
    (Area  city){    this.x    =Math
    .random()   *    city.w   +city.x;
this.y=Math.random()*city.h+city.y;this.z=0;
        }
        }
    class MyHouse
    extends House
        {
    boolean drift
    =true;MyHouse
    (Area  swamp)
        {
    super(swamp);
    this.z= -500;
        }
        }