I am receiving a list of user inputted Booleans, but i need to store then in a string

here is my code.

    Scanner keyboard = new Scanner(System.in);

    out.println("Welcome to the Class Stats program!");

    out.print("\nWhat is the name of this class? ");
    String className = keyboard.nextLine();

    out.print("\nHow many students are in this class? ");
    int numInClass = keyboard.nextInt();

    Class myClass = new Class();


    for(int x = 0; x < numInClass; x++)
    {
        out.print("\nEnter the name of student "+(x+1)+" :");
        String stuName = keyboard.nextLine();
        keyboard.next();
        out.println();

        out.println("Enter the grades for "+stuName);
        out.print("Use the format x - grades ( 2 - 100 100) : ");
        String grades = keyboard.nextLine();
        keyboard.next();
        out.println();

        myClass.addStudent(x,new Student(stuName,grades));
    }

    myClass.toString();

I am calling some methods from here, like the new student() and the .toString(), bu those are working fine, my problem is how do i store the list of user imputed Booleans, in a string.