how to sample randomly from array java code example

Example 1: how to randomize an array java

void shuffle(int [] arr) {
        for (int i = 0; i < arr.length; i++) {
            int index = (int) (Math.random() * arr.length);
            int temp = arr[i];
            arr[i] = arr[index];
            arr[index] = temp;
        }
    }

Example 2: how to select a random element from an array in java

import java.util.Random;

public class RandomStringFromArray
{    
  	public static void main(String[] args)    
    {        
      	String[] arr={"1", "2", "3", "4", "5"};
      	Random r=new Random();        
      	int randomNumber=r.nextInt(arr.length);
      	System.out.println(arr[randomNumber]);
    }
}