Is there anyway to make this code snippet more efficient?

Question

I am working on some code where I have this snippet

{

    user = "B";
    indice = 21;

    switch (user) {
        case "A":
            A[indice - 1] = "X";
            break;
        case "B":
            B[indice - 1] = "X";
            break;
        case "C":
            C[indice - 1] = "X";
            break;

    }

}

I was wondering if there is a possible way to make this code more efficiently so I don't have to rewrite it X ammount of times there could also be more values then the ammount of switch's I have setup, any help would be much advice would be a great help

Answer 1

Create a Map<String,String[]> , put the arrays A , B and C in it, and then use this code:

Map<String,String[]> arrayByName = new HashMap<String,String[]>();
arrayByName.put("A", A);
arrayByName.put("B", B);
arrayByName.put("C", C);
...
arrayByName.get(user)[indice-1] = "X";

Answer 2

If the cases of your switch will always be consecutive (eg "A", "B", "C" ) and will always be single-character, you could do something along the lines of

String[][] master = {A, B, C};

...

master[user.charAt(0) - 'A'][indice - 1] = "X";