How to Shuffle the Elements of Array in Java?

// Java Program to shuffle the 
// elements of an array
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class ArrayShuffle {
    public static void main(String[] args) {
        
        Integer[] arr = {1, 2, 3, 4,};

        // Convert array to list
        List<Integer> l = Arrays.asList(arr);

        // Shuffle the list
        Collections.shuffle(l);

        // Convert list back to array (if needed)
        arr = l.toArray(new Integer[0]);

        System.out.println(Arrays.toString(arr));
    }
}

// Java Program to Shuffle the
// elements of an array 
// using Fisher-Yates Shuffle Algorithm
import java.util.*;

public class FisherYatesAlgo {
    public static void main(String[] args) {
      
        Integer[] arr = {1, 2, 3, 4,};

        // Fisher-Yates Shuffle Algorithm
        Random r = new Random();
        for (int i = arr.length - 1; i > 0; i--) {
            
            // Random index from 0 to i
            int j = r.nextInt(i + 1);
          
            // Swap elements at i and j
            int t = arr[i];
            arr[i] = arr[j];
            arr[j] = t;
        }

        System.out.println("" + Arrays.toString(arr)); 
    }
}

// Java Program to Shuffle Array 
// Containing Characters
import java.util.*;

public class ShuffleCharacter {
  
    public static void main(String[] args) {
      
        char[] arr = {'A', 'B', 'C', 'D',};

        // Fisher-Yates Shuffle for Characters
        Random r = new Random();
        for (int i = arr.length - 1; i > 0; i--) {
          
            // Random index from 0 to i
            int j = r.nextInt(i + 1); 
            
            // Swap characters at i and j
            char t = arr[i];
            arr[i] = arr[j];
            arr[j] = t;
        }

        System.out.println(" " + new String(arr));
    }
}