Roster Manipulation Generic - WIP

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * This program performs the following functions:
 * - Will load student records from input.txt into their respective variables
 * - Will turn those variables into a Student Object
 * - Calculate their average % based on test scores
 * - Places the Student objects into an ArrayList representing the academic class.
 * - Lists the class with their % score and letter grade in the class.
 * - Remove the records matching ID 42P4 and 45A3
 * - Re-list the records with the removed students.
 * - Add the Student Records from Additions.txt
 * - Calculate the Year Rank based on hours completed.
 * - Calculate the GPA based on Current GPA and the current class hours.
 * - Adding, and sorting students is done using Generic Methods.
 * - Calculate the grades of the students and sort the ArrayList from Highest to lowest based on % score
 * - To prove the generic nature of the program, a list of doubles is brought in and sorted from smallest to largest
 * - Print the ArrayList.
 *
 * @author Carlos
 * @since 01/25/2019
 **/
public class RosterManipulations {

    public static void main(String[] args) throws Exception {
        RosterManipulations me = new RosterManipulations();
        ArrayList<Student> AcademicClass = new ArrayList<Student>();

        //Create an arraylist of doubles to contain doubles.txt
        ArrayList<Double> myDoubles = new ArrayList<Double>();

        //Making a new instance of the StudentClassManager for Students
        StudentClassManager <Student> myStudents= me.new StudentClassManager<Student>();

        //Making a new instance of the StudentClassManager for Doubles
        StudentClassManager<Double>genericDoubles= me.new StudentClassManager<Double>();
        try {
            Scanner input = new Scanner(new File("src/main/input.txt"));

            //Gather the information from the records in input.txt and set them equal to their respective variables
            while (input.hasNextLine()) {
                String StudentID = input.next();
                String Studentname = input.next();
                int test1 = input.nextInt();
                int test2 = input.nextInt();
                int test3 = input.nextInt();
                int totalHours = input.nextInt();
                float oldGPA = input.nextFloat();

                //Place those variables into a student object
                Student student1 = me.new Student(StudentID, Studentname, test1, test2, test3, totalHours, oldGPA);


                //Place the student object into an array list
                myStudents.AddStudent(AcademicClass, student1);

            }

            System.out.println("\nOriginal Class Roster Before Modifications: \n");
            //Print the contents of the ArrayList including their % score and grade before any manipulation
            for (int i = 0; i < AcademicClass.size(); i++) {
                System.out.println(AcademicClass.get(i));
            }

            me.DeleteStudent(AcademicClass, "45A3");
            me.DeleteStudent(AcademicClass, "42P4");
            System.out.println("\nStudents 45A3 & 42P4 Have Dropped The Class. Generating New Roster: \n");
            //Print the contents of the ArrayList including their % score and grade AFTER the students have dropped
            for (int i = 0; i < AcademicClass.size(); i++) {
                System.out.println(AcademicClass.get(i));
            }

            System.out.println("\n New Students Have Joined The Class. Generating Roster: \n");

            Scanner secondInput = new Scanner(new File("src/main/Additions.txt"));
            while (secondInput.hasNextLine()) {
                String AddedID = secondInput.next();
                String AddedName = secondInput.next();
                int AddedTest1 = secondInput.nextInt();
                int AddedTest2 = secondInput.nextInt();
                int AddedTest3 = secondInput.nextInt();
                int AddedTotalHours = secondInput.nextInt();
                float AddedoldGPA = secondInput.nextFloat();

                Student student2 = me.new Student(AddedID, AddedName, AddedTest1, AddedTest2, AddedTest3, AddedTotalHours, AddedoldGPA);

                //Adding students the expected students to the Class
                myStudents.AddStudent(AcademicClass, student2);
            }

            //Reprint the array with the students now added

            for (int i = 0; i < AcademicClass.size(); i++) {
                System.out.println(AcademicClass.get(i));
            }

            myStudents.SortLarge(AcademicClass);
            System.out.println("\nRegenerating Roster Sorted By Average Grade\n");
            //print the contents of the array sorted by Larger to Smaller based on average %
            for (int i = 0; i < AcademicClass.size(); i++) {
                System.out.println(AcademicClass.get(i));
            }

            //Read the contents of doubles.txt
            Scanner inputDoubles = new Scanner(new File("src/main/doubles.txt"));
            //Add the contents of doubles.txt to the ArrayList for doubles
            while (inputDoubles.hasNextLine()){
                genericDoubles.AddStudent(myDoubles,inputDoubles.nextDouble());
            }
            //Sort the contents of doubles.txt
            genericDoubles.SortLarge(myDoubles);

            //Print the sorted contents of doubles.txt from Smaller to Larger
            System.out.println("Proving Generic Sort By Printing Sorted Doubles From Smallest to Largest\n");

            //Print the sorted contents of doubles.txt from Smaller to Larger
            for (int i=myDoubles.size()-1; i >= 0; i--){
                System.out.println(myDoubles.get(i));
            }




        } catch (FileNotFoundException e) {
            System.err.println("File Input.txt was not found");
        }

    }

    //Deletes a Student who has dropped the class from the array list.
    public static void DeleteStudent(ArrayList<Student> AcademicClass, String ID) {
        for (int i = 0; i < AcademicClass.size(); i++) {
            if (AcademicClass.get(i).getStudentID().equals(ID)) {
                AcademicClass.remove(i);
            }
        }


    }

    //StudentClassManager class will use generics to perform the same actions regardless of the input type.
    public class StudentClassManager <T extends Comparable<T>> {

        //Generically adds an object (in this case students) to the Academic Class ArrayList
        public void AddStudent(ArrayList<T> AcademicClass, T Student) {
            AcademicClass.add(Student);
        }

        //Generically sorts the object from Larger to Smaller
        public void SortLarge(ArrayList<T> AcademicClass) {
            T xsave;
            int isw = 1;
            while (isw == 1) {
                isw = 0;
                for (int i = 0; i < AcademicClass.size() - 1; i++) {
                    switch (AcademicClass.get(i).compareTo(AcademicClass.get(i + 1))) {
                        case 1://the objects in array x are in the right order
                            break;
                        case -1://objects out of order, they must be changed.
                            // This is where to the place holder is used to swap values
                            xsave = AcademicClass.get(i);
                            AcademicClass.set(i, AcademicClass.get(i + 1));
                            AcademicClass.set(i + 1, xsave);
                            isw = 1;
                            break;
                        default://objects are equal no change
                    }
                }
            }
        }
    }


    //The Student class turns student records into objects ao that they an be sorted into an ArrayLIst
    public class Student implements Comparable<Student> {
        String StudentID;
        String Studentname;
        int test1;
        int test2;
        int test3;
        int average;
        int totalHours;
        float oldGPA;

        @Override
        //toString so that objects can be printed.
        public String toString() {
            return " ID: " + StudentID + " Name: " + Studentname + "\n Test 1 Score: " + test1 + "\n Test 2 Score: " + test2 + "\n Test 3 Score: " + test3 + "\n Test Average: " + average + "%" + "\n Class Grade: " + averageGrade(average) + "\n Total Hours: " + totalHours + "\n GPA: " + calculatenewGPA(oldGPA, gradePoint(average), totalHours) + "\n Year Rank: " + yearRank(totalHours) + "\n";
        }

        //Calculates the NEW GPA of a student
        public float calculatenewGPA(float oldGPA, int gradePoint, int totalHours) {
            return ((oldGPA * totalHours) + (2) * gradePoint) / (totalHours + 2);
        }

        //Calculate the GradePoint Value of A GPA
        public int gradePoint(int average) {
            {
                int gradePoint = 0;
                if (average >= 90) {
                    gradePoint = 4;
                } else if (average >= 80) {
                    gradePoint = 3;
                } else if (average >= 70) {
                    gradePoint = 2;
                } else if (average >= 60) {
                    gradePoint = 1;
                } else if (average >= 0) {
                    gradePoint = 0;
                }
                return gradePoint;
            }
        }

        //Calculate the Year Rank of each student
        public String yearRank(int totalHours) {
            String rank = null;
            if (totalHours <= 30) {
                rank = "Freshman";
            } else if (totalHours <= 60) {
                rank = "Sophomore";
            } else if (totalHours <= 90) {
                rank = "Junior";
            } else if (totalHours >= 91) {
                rank = "Senior";
            }
            return rank;
        }

        //Turn the average into a letter grade
        public String averageGrade(int average) {
            String averageLetter = null;
            if (average >= 90) {
                averageLetter = "A";
            } else if (average >= 80) {
                averageLetter = "B";
            } else if (average >= 70) {
                averageLetter = "C";
            } else if (average >= 60) {
                averageLetter = "D";
            } else if (average >= 0) {
                averageLetter = "F";
            }
            return averageLetter;
        }

        //Calculate the average grade of a student


        //Constructor for Student Class
        public Student(String StudentID, String Studentname, int test1, int test2, int test3, int totalHours, float oldGPA) {
            setStudentID(StudentID);
            setStudentname(Studentname);
            setTest1(test1);
            setTest2(test2);
            setTest3(test3);
            int average = (test1 + test2 + test3) / 3;
            setAverage(average);
            setTotalHours(totalHours);
            setoldGPA(oldGPA);
        }

        //Setters for the Student Class
        public void setStudentID(String StudentID) {
            this.StudentID = StudentID;
        }

        public void setStudentname(String Studentname) {
            this.Studentname = Studentname;
        }

        public void setTest1(int test1) {
            this.test1 = test1;
        }

        public void setTest2(int test2) {
            this.test2 = test2;
        }

        public void setTest3(int test3) {
            this.test3 = test3;
        }

        public void setAverage(int average) {
            this.average = average;
        }

        public void setTotalHours(int totalHours) {
            this.totalHours = totalHours;
        }

        public void setoldGPA(float oldGPA) {
            this.oldGPA = oldGPA;
        }


        //Getters for the Student Class
        public String getStudentID() {
            return StudentID;
        }

        public String getStudentname() {
            return Studentname;
        }

        public int getTest1() {
            return test1;
        }

        public int getTest2() {
            return test2;
        }

        public int getTest3() {
            return test3;
        }

        public int getAverage() {
            return average;
        }

        public int getTotalHours() {
            return totalHours;
        }

        public float getoldGPA() {
            return oldGPA;
        }


        public int compareTo(Student o) {
            return (this.getAverage() < o.getAverage() ? -1 :
                    (this.getAverage() == o.getAverage() ? 0 : 1));
        }
    }
}