Transfering random index of array to another array JAVA

Question

How do I transfer the index of a number I received randomly in an array to another array? I'm trying to make an application of some kind of Question&Answer thing and when I call a random question I want to call that answer too. But I don't know how to do it. How can I transfer the index that I called randomly question's to the answer's array?

package javaapplication18;

import java.util.Scanner;

public class JavaApplication18 {
    public static void main(String[] args) {
        System.out.println("Oyun başlıyor");
        
        String[] kelimeler = new String[] {"bilgisayar","fare","buzdolabi","kitap","otomobil"};
        
        String rastgeleKelime = kelimeler[(int) (Math.random() * kelimeler.length)];
        
        System.out.println("Sorulan kelime "+ rastgeleKelime.length()+" harfli.");
        
        char[] harfler = new char[rastgeleKelime.length()];
        
        for(int i = 0; i<harfler.length; i++){
            harfler[i] = '.';
        }
        
        int haklar = 3;
        
        Scanner scanner = new Scanner(System.in);
        
        while(haklar > 0){
            System.out.print("Kalan hak: ");
            for(int i = 0; i < haklar; i++){
                System.out.print("X");
            }
            
            System.out.println();
            System.out.print("Tahmin: ");
            
            String input = scanner.nextLine();
            char harf = input.charAt(0);
            
            boolean tahmin = false;
            
            for(int i = 0; i < rastgeleKelime.length(); i++){
                char l = rastgeleKelime.charAt(i);
                
                if(l == harf){
                    harfler[i] = l;
                    tahmin = true;
                }
            }
            
            if(!tahmin){
                haklar = haklar-1;   
            }
            
            boolean oyunsonu = true;
            
            System.out.print("Kelime: ");
            
            for(int i = 0; i < harfler.length; i++){
                if(harfler[i] == '.'){
                    oyunsonu = false;
                }
                
                System.out.print(harfler[i]);
            }
            
            System.out.println();
            
            System.out.println("----------------------");
            
            if(oyunsonu){
                System.out.println("Tebrikler. Kazandınız!");
                break;
            }
            
            if(haklar == 0){
                System.out.println("Kaybettiniz! Kelime: "+ rastgeleKelime);
            }
        }
        
        System.out.println("Oyun bitti");
    }
}

Answer 1

I did it. I created rnd object from using Random library. And then I assigned rnd to an "a" object and then I called this object in my Array so it worked. Thank you for your supports.

public static void main(String[] args) {
    System.out.println("Oyun başlıyor");
    
    String[] cümleler = new String[] {"Elephant", "Deer", "Fish", "Crocodile", "Cat"};
    
    String[] kelimeler = new String[] {"bilgisayar","fare","buzdolabi","kitap","otomobil"};
    
    Random random =new Random();
    int a=random.nextInt(5);
    
    String rastgeleKelime = kelimeler[a];
    String rastgeleCümle = cümleler[a];
    
    System.out.println(rastgeleCümle);
    
    System.out.println("Sorulan kelime "+ rastgeleKelime.length()+" harfli.");
    
    char[] harfler = new char[rastgeleKelime.length()];
    
    for(int i = 0; i<harfler.length; i++){
        harfler[i] = '.';
    }