Changing arrays.

Ok one last problem... i hope.
When i run through my Undergrad loop and add the grades it works. but when i add two or more Undergrad students it uses the most recent scores added for all the Undergrad students. I realize i need to do some sort of loop so that i can add more arrays. I can have a maximum of 20 students. in my array. How would i make an array that has a different name every time 1 is added. here is my code.

Code:

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class Undergrad extends College
  {
      int[] tempAct, tempExercise, tempProject;
   
          int ap, ex1, ex2, fEx;
         
     
          public UnderGrad(String name, int age, String schoolName, int id, double gpa, int apCreds, String major, String minor, boolean time, int examOne, int examTwo, int[] activity, int[] exercise, int[] projects, int finalExam)
          {
                  super(name, age, id, schoolName, gpa, major, minor, time);
                  tempAct = activity;
                  tempExercise = exercise;
                  tempProject = projects;
                        ap = apCreds;
                        ex1 = examOne;
                        ex2 = examTwo;
                        fEx = finalExam;
          }
         
          public String toString()
          {
                        String A, E, P;
                        A = "";
                        for(int i = 0; i < 14; i++)
                                A += tempAct[i] + " ";
                        E = "";
                        for(int j = 0; j < 14; j++)
                                E += tempExercise[j] + " ";
                        P = "";
                        for (int k = 0; k < 14; k++)
                                P += tempProject[k] + " ";
                       
                  String temp = super.toString();
                  return temp +"\nExam One Grade: "+ex1+ "\nExam Two Grade: "+ex2+"\nActivity Grades: "+A+"\nExercise Grades: "+E+"\nProject Grades: "+P;
          }
                 
  }

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Got it fixed. It was because my arrays in the driver file were declared static. Not sure why it effected it but that is the reason.