Index (get) comparison in Array List not working properly

I've been trying to compare a string (right answer) to an alternative of a question as an example in a project I'm developing, but I can't succeed in all the different ways I try.

The goal is that with each wrong answer given, the alternatives are shuffled and, as long as the person does not answer the correct alternative, the Loop repeats itself.

The options - a, b, c, d, E - remains untouchable. Only the text of the alternatives are shuffled. The question is simple but it is exemplary.

I am using .get() through for which returns me from 0 to 4 for each element of ArrayList. It is at this moment that the comparison through the switch with the variable boolean seems not to work, although the Collections.shuffle works correctly with each wrong attempt. For example if I test outside the scope of ( a,b,c, d, and ).

Next my code:

    public static void main(String[] args) {

    Scanner input = new Scanner(System.in);

    boolean acertou = false;
    List<String> questao = new ArrayList<String>();
    questao.add("Porta OR");
    questao.add("Porta XOR");
    questao.add("Porta AND");
    questao.add("Porta NOR");
    questao.add("Porta NOT");

    String opcaoCorreta = "Porta NOT", opcaoString;
    char opcao;

    do {
        for (int i = 0; i < 5; i++) {
            questao.get(i);
        }

        System.out.println(
                "(Conceitos de Computação) Que porta lógica utilizamos para inverter o sinal lógico recebido?\n");
        System.out.println("a) " + questao.get(0));
        System.out.println("b) " + questao.get(1));
        System.out.println("c) " + questao.get(2));
        System.out.println("d) " + questao.get(3));
        System.out.println("e) " + questao.get(4));

        System.out.println("\nResposta: ");
        opcaoString = input.next();
        opcao = opcaoString.charAt(0);

        switch (opcao) {
        case 'a':
            if (opcaoCorreta.equals(questao.get(0))) {
                acertou = true;
            }
                break;
        case 'b':
            if (opcaoCorreta.equals(questao.get(1))) {
                acertou = true;
            }
                break;
        case 'c':
            if (opcaoCorreta.equals(questao.get(2))) {
                acertou = true;
            }
                break;
        case 'd':
            if (opcaoCorreta.equals(questao.get(3))) {
                acertou = true;
            }
                break;
        case 'e':
            if (opcaoCorreta.equals(questao.get(4))) {
                acertou = true;
            }
                break;
        if (acertou == true) {
            System.out.println("Resposta correta");
        } else {
            System.out.println("Resposta incorreta");
            Collections.shuffle(questao);
        }

    } while (!acertou);

    input.close();
} }

EDIT: using break inside if in switch-case consisted the big problem of the code, this now neat and working with equals.