I am writing a program to recored and maintain student data. I have written most of the code but am a running into problems, calling methods. I would like to call the following methods.

printAll();


printInvalidEmails();


printAverageGrade();

remove(“3”);

remove(“3”);

I have written the following code for my Roster class.

import java.util.ArrayList;   public class Roster {      private static ArrayList<Student> studentinfo = new ArrayList<>();      public static void main(String[] args) {           add("1 ", "John", "Smith", "John1989@gmail.com", 20, 88, 79, 59);         add("2 ", "Suzan", "Erickson", "Erickson_1990@gmailcom", 19, 91, 72, 85);         add("3 ", "Jack", "Napoli", "The_lawyer99yahoo.com", 19, 85, 84, 87);         add("4 ", "Erin", "Black", "Erin.black@comcast.net", 22, 91, 98, 82);         add("5 ", "Eric", "Johnson", "Ejohnson@gmail.com", 26, 97, 96, 99);        }       public static void add(String studentID, String fname, String lname, String eaddress, int age, double grade1, double grade2, double grade3) {         double[] grades = {grade1, grade2, grade3};         Student newStudent = new Student(studentID, fname, lname, eaddress, age, grades);         studentinfo.add(newStudent);     }      public static void printAll() {         System.out.println("Student data");         for (int i = 0; i < studentinfo.size(); i++) {             studentinfo.get(i).print();         }     }       public static void printAverageGrade(String studentID) {         System.out.println("Print Average Grade");         for (Student a : studentinfo) {             if (a.getStudentID().equals(studentID)) {                  double average = (a.getGrades()[0] + a.getGrades()[1] + a.getGrades()[2] + a.getGrades()[3] + a.getGrades()[4]) / 2.0;                 System.out.println("Student ID: " + a.getStudentID() + " average grade:" + average);             }         }     }       public static void remove(String studentID) {          for (Student a : studentinfo) {             if (a.getStudentID().equals(studentID)) {                 studentinfo.remove(a);                 return;             }         }         System.out.println("Unable to remove, student ID was not found");     }      public static void printInvalidEmails(String Eaddress) {         for (Student a : studentinfo) {              String email = a.getEaddress();             if (email.equals(Eaddress)) {                 if (!email.contains("@")) {                     System.out.println(email + " Is not a valid Email");                  }                 if (!email.contains(".")) {                     System.out.println(email + " Is not a valid Email");                  }                 if (email.contains(" ")) {                     System.out.println(email + " Is not a valid Email");                                 }                         }                     }                 }             } 

The code for my second class, student is:

import java.util.ArrayList;   public class Roster {      private static ArrayList<Student> studentinfo = new ArrayList<>();      public static void main(String[] args) {           add("1 ", "John", "Smith", "John1989@gmail.com", 20, 88, 79, 59);         add("2 ", "Suzan", "Erickson", "Erickson_1990@gmailcom", 19, 91, 72, 85);         add("3 ", "Jack", "Napoli", "The_lawyer99yahoo.com", 19, 85, 84, 87);         add("4 ", "Erin", "Black", "Erin.black@comcast.net", 22, 91, 98, 82);         add("5 ", "Alan", "Bulmahn", "abulmah@wgu.edu", 26, 97, 96, 99);        }       public static void add(String studentID, String fname, String lname, String eaddress, int age, double grade1, double grade2, double grade3) {         double[] grades = {grade1, grade2, grade3};         Student newStudent = new Student(studentID, fname, lname, eaddress, age, grades);         studentinfo.add(newStudent);     }      public static void printAll() {         System.out.println("Student data");         for (int i = 0; i < studentinfo.size(); i++) {             studentinfo.get(i).print();         }     }       public static void printAverageGrade(String studentID) {         System.out.println("Print Average Grade");         for (Student a : studentinfo) {             if (a.getStudentID().equals(studentID)) {                  double average = (a.getGrades()[0] + a.getGrades()[1] + a.getGrades()[2] + a.getGrades()[3] + a.getGrades()[4]) / 2.0;                 System.out.println("Student ID: " + a.getStudentID() + " average grade:" + average);             }         }     }       public static void remove(String studentID) {          for (Student a : studentinfo) {             if (a.getStudentID().equals(studentID)) {                 studentinfo.remove(a);                 return;             }         }         System.out.println("Unable to remove, student ID was not found");     }      public static void printInvalidEmails(String Eaddress) {         for (Student a : studentinfo) {              String email = a.getEaddress();             if (email.equals(Eaddress)) {                 if (!email.contains("@")) {                     System.out.println(email + " Is not a valid Email");                  }                 if (!email.contains(".")) {                     System.out.println(email + " Is not a valid Email");                  }                 if (email.contains(" ")) {                     System.out.println(email + " Is not a valid Email");                                 }                         }                     }                 }             } 

Thank you for your help.