public String printNthItem(int n) {
     String retVal = “”;
     for(int int i = 0; i < (this.N - n) ; i++)
          retVal += “ “;
     for(int i = 0; i < n ; i++)
          retVal += “x”;
     return retVal;
}

// code for the second method setParam below

public void setParam(int arg) {
     N = arg:
}