Java Quiz (Shuffling Answers)

Question

I am currently working on a schoolwork assignment to create a quiz demo in java. However, when I shuffle the question answer options, the correct answer index is mixed up and I cannot fix it. Please help. Thank you

Shuffle method: private String[] shuffleOptions(String[] options, int answer) { Random ran = new Random();

    // Answer value before shuffling
    String answerValue = options[answer];
    
    // Shuffle options randomly
    for (int i = options.length - 1; i > 0; i--) {
        int index = ran.nextInt(i + 1);
        String temp = options[index];
        options[index] = options[i];
        options[i] = temp;
    }

    // Find the new correct answer index after shuffling
    for (int i = 0; i < options.length; i++) {
        if (options[i].equals(answerValue)) {
            answerTemp = i;
        }
    }
    
    return options;
 }

Use:

import java.util.Random;
import java.util.Scanner;

public class Quiz {
 private String name;
 private Question[] questions;
 private int capacity;
 private int size;
 private int score;
 
 private int answerTemp;

Quiz(){
    this.name = "Quiz" + String.valueOf(Math.random()*1000);
    this.questions = new Question[5];
    this.capacity = 5;
    this.size = 0;
    this.score = 0;
    
    this.answerTemp = 0;
}

private void increaseCapacity() { // Creates new quiz with double capacity/length for questions
    capacity *= 2;
    Question[] doubleQuestions = new Question[capacity];
    if (size > 0) {
        System.arraycopy(questions, 0, doubleQuestions, 0, size);
    }
    
    questions = doubleQuestions;
}

public void addQuestion(Question question) {
    if (size >= capacity) { // Reaches max capacity/length of questions
        increaseCapacity();
    } 
    
    questions[size++] = question;
}

private String[] shuffleOptions(String[] options, int answer) {
    Random ran = new Random();
    
     // Answer value before shuffling
    String answerValue = options[answer];
    
    // Shuffle options randomly
    for (int i = options.length - 1; i > 0; i--) {
        int index = ran.nextInt(i + 1);
        String temp = options[index];
        options[index] = options[i];
        options[i] = temp;
    }

    // Find the new correct answer index after shuffling
    for (int i = 0; i < options.length; i++) {
        if (options[i].equals(answerValue)) {
            answerTemp = i;
        }
    }
    
    return options;
 }

private String finalScore() { //Returns (percentage) final score
    int finalScore = (int) ((double) score / size * 100);
    return("FINAL SCORE: " + finalScore + "%" + "!");
}

public void giveQuiz() {
    Scanner userInput = new Scanner(System.in);
    int userAnswer = 0;
    
    for (int i = 0; i < size; i++) {
         Question currentQuestion = questions[i];
         System.out.println("Question " + (i + 1) + ") : " + currentQuestion.getQuestion());
         String[] shuffledOptions = shuffleOptions(currentQuestion.getOptions(), currentQuestion.getAnswer());
         currentQuestion.setAnswer(answerTemp); // Sets correct answer value to index
         
         for (int x = 0; x < shuffledOptions.length; x++) { // Prints shuffled options
             System.out.println("(" + (x + 1) + ") " + shuffledOptions[x]);
         }
         
         System.out.println("\n Type Answer (1-4): ");
         userAnswer = userInput.nextInt();
         
         if (userAnswer == currentQuestion.getAnswer()) { //Checks for correct answer
             System.out.println("\nCORRECT ANSWER");
             score++;
         }
         else {
             System.out.println("\nWRONG ANSWER");
         }
    }
    
    System.out.println(finalScore());
    userInput.close();
  } //end of giveQuiz
}

Input number for correct answer Outputs incorrect

Answer 1

Your user input starts with 1, but your answer starts with 0 This is your user input

System.out.println("\n Type Answer (1-4): ");
userAnswer = userInput.nextInt();

This is the answer generate process

    for (int i = 0; i < options.length; i++) {
        if (options[i].equals(answerValue)) {
            answerTemp = i;
        }
    }

If the first answer is correct, then the answerTemp is 0 instead of 1, that's the problem