Java switch loop break trouble

Question

I am beginning with Java and found a task for switch, which I am struggling with. Hope you can point me in the right way. User can input string 1, 1-, 2, 2-, 3, 3-, 4, 4- or 5 which can be of a value of 1 to 10. Switch is to be used to convert 1 to 1.0, 1- to 1.5, 2 to 2.0, 2- to 2.5, etc. ,, however I just need to store 1 or 0 that it is used, but in cannot be boolean, because I need to do some math on it. And this switch should repeat for a given number of repeats. This should be done without using array. So I came with an idea of creating a bunch of 9 declarations to store 1 or 0 for each 1, 1-, etc., and another 9 to store their corresponding value. This is fine as long I run it just once, but when I put in the loop, it gets messy not working properly. I feel it is my misunderstandings of breaks, but I just don´t see it. Thanks

The output in case of the loop looks like: Enter grade 1- Enter stock for 1-: 3 Enter grade Invalid gradeEnter grade

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    int goods = 5;

    int grade1 = 0;
    int grade15 = 0;
    int grade2 = 0;
    int grade25 = 0;
    int grade3 = 0;
    int grade35 = 0;
    int grade4 = 0;
    int grade45 = 0;
    int grade5 = 0;

    int stock1 = 0;
    int stock15 = 0;
    int stock2 = 0;
    int stock25 = 0;
    int stock3 = 0;
    int stock35 = 0;
    int stock4 = 0;
    int stock45 = 0;
    int stock5 = 0;

    for( int i = 1; i <= goods; i++ ){  //start of for

        System.out.println("Enter grade");   // grade input
        String select1 = (sc.nextLine());

        switch (select1) {                    //here starts switch
            case "1":
                grade1 = 1;
                System.out.print("Enter stock for 1: ");
                stock1 = sc.nextInt();
                break;
            case "1-":
                grade15 = 1;
                System.out.print("Enter stock for 1-: ");
                stock15 = sc.nextInt();
                break;
            case "2":
                grade2 = 1;
                System.out.print("Enter stock for 2: ");
                stock2 = sc.nextInt();
                break;
            case "2-":
                grade25 = 1;
                System.out.print("Enter stock for 2-: ");
                stock25 = sc.nextInt();
                break;
            case "3":
                grade3 = 1;
                System.out.print("Enter stock for 3: ");
                stock3 = sc.nextInt();
                break;
            case "3-":
                grade35 = 1;
                System.out.print("Enter stock for 3-: ");
                stock35 = sc.nextInt();
                break;
            case "4":
                grade4 = 1;
                System.out.print("Enter stock for 4: ");
                stock4 = sc.nextInt();
                break;
            case "4-":
                grade45 = 1;
                System.out.print("Enter stock for 4-: ");
                stock45 = sc.nextInt();
                break;
            case "5":
                grade5 = 1;
                System.out.print("Enter stock for 5: ");
                stock5 = sc.nextInt();
                break;
            default:
                System.out.print("Invalid grade");
        }  // end of switch

    }  //end of for



    // test output of values for further use

    System.out.println (grade1);
    System.out.println (grade15);
    System.out.println (grade2);
    System.out.println (grade25);
    System.out.println (grade3);
    System.out.println (grade35);
    System.out.println (grade4);
    System.out.println (grade45);
    System.out.println (grade5);
    System.out.println();
    System.out.println (stock1);
    System.out.println (stock15);
    System.out.println (stock2);
    System.out.println (stock25);
    System.out.println (stock3);
    System.out.println (stock35);
    System.out.println (stock4);
    System.out.println (stock45);
    System.out.println (stock5);
}