Does this Java program need to be two separate Files -

hi taking java class , first assignment involving object oriented programming. getting issues simplecalc portion , wondering if work should 2 separate files or if missing component allows statcalc part , simplecalc part speak 1 another. please keep in mind new java might need spelled out bit more have seen on stack on flow in past @ times, however, appreciate thank in advance. here code:

package tutorial;  /*    * object of class statcalc can used compute several simple statistics   * set of numbers.  numbers entered dataset using   * enter(double) method.  methods provided return following   * statistics set of numbers have been entered: number   * of items, sum of items, average, standard deviation,   * maximum, , minimum.   */ public class statcalc {             private int count;   // number of numbers have been entered.            private double sum;  // sum of items have been entered.            private double squaresum;  // sum of squares of items.                    private double max = double.negative_infinity;                               private double min = double.positive_infinity;            /**             * add number dataset.  statistics computed             * numbers have been added dataset using method.             */            public void enter(double num) {                   count++;                   sum += num;                   squaresum += num*num;                                  if (count == 1){                       max = num;                       min = num;                   }                   else {                       if (num > max)                           max = num;                       if (num < min)                           min = num;                   }                 }            /**              * return number of items have been entered dataset.              */             public int getcount() {                    return count;            }            /**              * return sum of numbers have been entered.              */             public double getsum() {                    return sum;            }                     /**              * return average of items have been entered.              * return value double.nan if no numbers have been entered.             */             public double getmean() {                    return sum / count;            }                  /**              * return standard deviation of items have been entered.              * return value double.nan if no numbers have been entered.              */             public double getstandarddeviation() {                    double mean = getmean();                    return math.sqrt( squaresum/count - mean*mean );            }             public double getmin(){                return min;            }            public double getmax(){                return max;            }        }// end class statcalc  public class simplecalc {     public static void main(string[]args){         scanner in = new scanner(system.in);         simplecalc calc;         calc = new simplecalc();          double item;         system.out.println("enter numbers here. enter 0 stop.");                system.out.println();          do{              system.out.print("? ");             item = in.nextdouble();              if (item != 0)                 calc.enter(item);         }while (item != 0);          system.out.println("\nstatistics calc:\n");            system.out.println(count: "+calc.getcount"());          system.out.println(sum: "+calc.getsum"());            system.out.println("minimum: "+calc.getmin());           system.out.println("maximum: "+calc.getmax());           system.out.println("average: "+calc.getmean());              system.out.println("standard deviation: "+calc.getstandarddeviation());          }// end main }//end simplecalc 

in java public class must in file same name class. since have public class named statcalc filename must statcalc.java. second class public therefore must in own file.