This is the ReportCard class the creates Student Cards.

ReportCard.java

package com.example.reportcard;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * Created by jesse on 04/04/18.
 * This is a part of the project ReportCard.
 */
public class ReportCard {

    // CLASS ATTRIBUTES
    private List<String> listStudentNames;
    private List<String> disciplines;
    private List<List> listOfStudentsGrades;
    private HashMap<String, List<String>> hashListDisciplinesAndGrades;

    // EMPTY CONSTRUCTOR
    public ReportCard() {
    }

    /**
     * FULL CONSTRUCTOR
     * @param listStudentNames are the names of the students.
     * @param disciplines are the list od disciplines the the student receives grades.
     * @param listOfStudentsGrades It's a list of object type List. Each position of the list store a list with all grades of one student.
     * @param hashListDisciplinesAndGrades its a List that each position holds a student name <String> and a List<String>. Each item List holds the student name and all of his disciplines names and grades.
     */
    public ReportCard(List<String> listStudentNames, List<String> disciplines, List<List> listOfStudentsGrades, HashMap<String, List<String>> hashListDisciplinesAndGrades) {
        this.listStudentNames = listStudentNames;
        this.disciplines = disciplines;
        this.listOfStudentsGrades = listOfStudentsGrades;
//        this.studentGrades = studentGrades;
        this.hashListDisciplinesAndGrades = hashListDisciplinesAndGrades;
    }

    // METHODS GETTERS AND SETTERS
    public List<String> getListStudentNames() {
        return listStudentNames;
    }
    public void setListStudentNames(List<String> listStudentNames) {
        this.listStudentNames = listStudentNames;
    }
    public List<String> getDisciplines() {
        return disciplines;
    }
    public void setDisciplines(List<String> disciplines) {
        this.disciplines = disciplines;
    }
    public List<List> getListOfStudentsGrades() {
        return listOfStudentsGrades;
    }
    public void setListOfStudentsGrades(List<List> listOfStudentsGrades) {
        this.listOfStudentsGrades = listOfStudentsGrades;
    }
    public HashMap<String, List<String>> getHashListDisciplinesAndGrades() {
        return hashListDisciplinesAndGrades;
    }
    public void setHashListDisciplinesAndGrades(HashMap<String, List<String>> hashListDisciplinesAndGrades) {
        this.hashListDisciplinesAndGrades = hashListDisciplinesAndGrades;
    }

    @Override
    public String toString() {

        String message = "";
        List<String> grades = new ArrayList<>();

        // Execute this for each student on the list.
        for (int i = 0; i < listStudentNames.size(); i++) {

            // Get the value of the position 0 in the list "listStudentNames".
            message += "\nSTUDENT REPORT CARD - Name: "  + listStudentNames.get(i) + "\n";

            for (int id = 0; id < disciplines.size(); id++) {
                // For each discipline, get a grade list in
                grades.add(disciplines.get(id) + ": " + listOfStudentsGrades.get(i).get(id));
            }

            hashListDisciplinesAndGrades.put(listStudentNames.get(i), grades);

            String studentName = listStudentNames.get(i);
            message += String.valueOf(hashListDisciplinesAndGrades.get(studentName));
        }
        return message;
    }

}