Main Class

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.Scanner;

public class Main_Class
{
    static Scanner t=new Scanner(System.in);

    static ArrayList<Student> myList = new ArrayList<Student>();

     enum MenuOpt
    {
        ADD, REMOVE, SEARCH, PRINT, SAVE, LOAD, EXIT
    }

    public static void main(String[] args)
    {

        show_menu();
    }


    //options menu
    public static void show_menu()
    {
        String opt="Exit";
        do
        {
            System.out.println("\n\n");
            for (MenuOpt meniu : EnumSet.allOf(MenuOpt.class))
            {
                System.out.println(meniu);
            }

            System.out.println("Type your choice as written in the menu above!");
            opt=t.nextLine();

            MenuOpt mo = getEnumFromString(MenuOpt.class, opt);
            System.out.println(mo);

            switch (mo)
            {
            case ADD:
            {   add(); break; }

            case REMOVE:
            {   remove(); break; }

            case SEARCH:
            {   search(); break; }

            case PRINT:
            {   print(); break; }

            case SAVE:
            {   save(); break; }

            case LOAD:
            {   load(); break; }

            default:
            {   opt="Exit"; break; }

            }

        }while(true);
    }


    //menu methods

    public static void add()
    {
        String nume;
        int age;
        Float mark;

        System.out.println("\nType data for new Student:\nName: ");
        nume=t.nextLine();
        System.out.println("\nAge:");
        age=t.nextInt();
        System.out.println("\nMark");
        mark=t.nextFloat();

        myList.add(new Student(nume, age, mark));
        t.nextLine();
        System.out.println("Student added!");
    }

    public static void remove()
    {
        System.out.println("\nType name of Student to remove: ");
        String name=t.nextLine();

        boolean found=false;

        for(Student s : myList)
        {
            if (s.getName().equals(name))
            {
                myList.remove(s);
                System.out.println("Done!");
                found=true;
                break;
            }
        }
        if (found==false)
            System.out.println("Student not found!");
    }

    public static String search()
    {
        String nume;
        int age;
        Float mark;

        System.out.println("\nType data for Student to search:\nName: ");
        nume=t.nextLine();
        System.out.println("\nAge:");
        age=t.nextInt();
        System.out.println("\nMark");
        mark=t.nextFloat();

        Student myStudent = new Student(nume, age, mark);

        for(Student s : myList)
        {
            if (s.equals(myStudent))
            {
                return "Student found!";
            }
        }
        return "Student not found!";
    }

    public static void print()
    {
        for(Student s : myList)
        {
            System.out.println(s);
        }
    }

    public static void save()
    {
        try
        {
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("date"));

            for(Student s : myList)
            {
                out.writeObject(s);
            }
            out.close();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }


    }

    public static void load()
    {
        try
        {
            FileInputStream fis = new FileInputStream("date");
            ObjectInputStream in = new ObjectInputStream(fis);
            while (fis.available()>0 )
            {
                myList.add((Student) in.readObject());
            }
            in.close();
        }

        catch (Exception e)
        {
            e.printStackTrace();
        }
    }


    //create enum from a string to switch it in the menu
    public static <T extends Enum<T>> T getEnumFromString(Class<T> c, String string) {
        if( c != null && string != null ) {
            try {
                return Enum.valueOf(c, string.trim().toUpperCase());
            } catch(IllegalArgumentException ex) {
            }
        }
        return null;
    }
}