Question Answer In Android Studio

 package com.example.ch4practiceset;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private String[] questions = {"Java is a person?" , "Java is introduced in 1233? " , "java is created with Python?", "Java has a Abstact classes" , "Java Supporte interface?"};
    private boolean[] answers = {false , false , false , true , true};
    private int score = 0;
    Button yes;
    Button no;
    TextView question;

    private int index= 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        yes = findViewById(R.id.yes);
        no = findViewById(R.id.no);
        question = findViewById(R.id.question);
        question.setText(questions[index]);
        yes.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (index<=questions.length - 1){
                    //If you have given correct answer
                    if (answers[index] == true){
                        score++;
                    }
                    index ++;
                    if (index<=questions.length - 1){
                        question.setText(questions[index]);
                    }
                    else{
                        Toast.makeText(MainActivity.this, "Your score is:" + score, Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });
        no.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //If the array is not going out of bound
                if (index<=questions.length - 1){
                    //If you have given correct answer
                    if (answers[index] == false){
                        score++;
                    }
                    index ++;
                    if (index<=questions.length - 1){
                        question.setText(questions[index]);
                    }
                    else{
                        Toast.makeText(MainActivity.this, "Your score is:" + score, Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });

    }
}