I'll post my parent class at top and subclass at the bottom.

This is my parent class:

import java.util.Scanner; public class ClassGrades { // instance variables static int [] gradeSet; static int mean; //static int median; static int grades; // override the toString method public String toString() { return ("Mean:"+ClassGrades.getMean(gradeSet) +"\n"+"Median:" +ClassGrades.getMedian(gradeSet) +"\n"+"Mode:" +ClassGrades.getMode(gradeSet)); } // set the grade values public static int [] setGrades() { Scanner keyboard = new Scanner(System.in); int[] gradeSet = new int[3]; int b = 0; System.out.print("Hello Teach! Please enter the grades of your thirty students below\n" + "Enter negative number to cancel.\n"); for(int i = 0; i < gradeSet.length; ++i) { System.out.println("Please Enter Grade: \n"); gradeSet[i] = keyboard.nextInt(); if(gradeSet[i] < 0 && gradeSet.length > 2) break; ++b; } return (gradeSet); } //calculate the mean public static int getMean(int gradeSet []) { int sum = 0; int average=0; for(int j = 0; j < gradeSet.length; j++) { sum += gradeSet[j]; average = sum / gradeSet.length; } return average; } //calculate median public static int getMedian(int gradeSet[]) { int median; if (grades % 2 != 0) { median = gradeSet[gradeSet.length / 2]; } else { median = (gradeSet[(gradeSet.length / 2) - 1] + gradeSet[gradeSet.length / 2]) / (int)2; } return (median); } //calculate mode public static int getMode(int gradeSet[]) { int max=0, maxCount=0; int length=gradeSet.length; for (int i = 0; i <length; ++i) { int count = 0; for (int j = 0; j <length; ++j) { if (gradeSet[j] == gradeSet[i]) ++count; } if (count > maxCount) { maxCount = count; max = gradeSet[i]; } } return max; } }

This is my subclass:

import classgrades.*; import java.util.Scanner; public class ClassGradesTest extends ClassGrades { public static int getMean(){ int m = ClassGrades.getMean(gradeSet); return (m); } public static int getMedian(){ int med = ClassGrades.getMedian(gradeSet); return (med); } public static int getMode(){ int mod=ClassGrades.getMode(gradeSet); return (mod); } public static void main(String[] args) { ClassGrades.setGrades(); } }