java – Android quiz How to show the question based on the answer?

I am currently doing a quiz app and the question should be coming out based on the answer. The below is my code. I have been looking online to try various options and cannot find a way to resolve it without making lots of errors. The code for my quiz activity is below. Thanks.

quiz.java

public class quiz extends AppCompatActivity implements View.OnClickListener {

    TextView questionNo, question;
    RadioGroup rg;
    Button quiz_nextBtn, quiz_PrevBtn;
    RadioButton rb1, rb2;
    int current_question = 0;
    int next_question=0;

    private quizAdapter() questionBank = new quizAdapter(){
            new quizAdapter(R.string.q1, R.string.q1_a1, R.string.q1_a2),
            new quizAdapter(R.string.q2, R.string.q2_a1, R.string.q2_a2),
            new quizAdapter(R.string.q3, R.string.q3_a1, R.string.q3_a2),
            new quizAdapter(R.string.q4, R.string.q4_a1, R.string.q4_a2),
            new quizAdapter(R.string.q5, R.string.q5_a1, R.string.q5_a2),
            new quizAdapter(R.string.q6, R.string.q6_a1, R.string.q6_a2),
            new quizAdapter(R.string.q7, R.string.q7_a1, R.string.q7_a2)
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_quiz);

        rg = findViewById(R.id.quiz_answer);
        rb1 = findViewById(R.id.rb1);
        rb2 = findViewById(R.id.rb2);
        questionNo = findViewById(R.id.quiz_questionNo);
        question = findViewById(R.id.quiz_question);
        quiz_nextBtn = findViewById(R.id.quiz_nextBtn);
        quiz_PrevBtn = findViewById(R.id.quiz_PrevBtn);

        quiz_nextBtn.setOnClickListener(this);
        quiz_PrevBtn.setOnClickListener(this);
    }

    public void onClick(View v) {
        switch (v.getId()){
            case R.id.quiz_nextBtn:
                if(current_question<7){
                    current_question++;
                    if(current_question == 6){
                        question.setText("We are finish");
                    }
                    else {
                        if(current_question == 0 && rb1.isChecked()){
                            current_question = 1;
                        }
                        else if (current_question == 0 && rb2.isChecked()){
                            current_question = 4;
                        }
                        else if (current_question == 1 && rb1.isChecked()){
                            current_question = 2;
                        }
                        else if (current_question == 1 && rb2.isChecked()){
                            current_question = 3;
                        }
                        else if (current_question == 4 && rb1.isChecked()){
                            current_question = 5;
                        }
                        else if (current_question == 4 && rb2.isChecked()){
                            current_question = 6;
                        }

                        updateQuestion();
                    }

                }
                break;
            case R.id.quiz_PrevBtn:
                if (current_question > 0) {
                    current_question = (current_question - 1) % questionBank.length;
                    updateQuestion();
                }
        }
    }

    private void updateQuestion() {
        Log.d("Current", "onClick: " + current_question);

        question.setText(questionBank(current_question).getQuestion());
        rb1.setText(questionBank(current_question).getRb1());
        rb2.setText(questionBank(current_question).getRb2());
    }
}

quizAdapter.java

public class quizAdapter {

    private int question;
    private int rb1;
    private int rb2;

    public quizAdapter(int question, int rb1, int rb2)
    {
        this.question = question;
        this.rb1 = rb1;
        this.rb2 = rb2;
    }

    public int getQuestion()
    {
        return question;
    }

    public int getRb1()
    {
        return rb1;
    }

    public int getRb2()
    {
        return rb2;
    }

}