How do you mix ArrayList elements in Java?

This code shows how to create a random ArrayList. You can mix objects by calling the function Collections.shuffle()  (in French "mix"). The method shuffle()  returns different results after each run:

import java.util.ArrayList; 
import java.util.Collections; 
 
public class ShuffleArrayList {
 
 public static void main(String a[]){
 ArrayList< String> arlist = new ArrayList< String> (); 
 //add elements
 arlist.add("1"); 
 arlist.add("2"); 
 arlist.add("3"); 
 arlist.add("4"); 
 arlist.add("5"); 
 arlist.add("6"); 
 arlist.add("7"); 
 arlist.add("8"); 
 
 System.out.println("Before: "+arlist); 
 
 System.out.println("After:"); 
 
 //we will call the shuffle method 5 times
 //to distinguish the results
 for(int i =0; i< 5; i++){
 Collections.shuffle(arlist); 
 System.out.println(arlist); 
 }
 }
}

Runtime:

Before: [1, 2, 3, 4, 5, 6, 7, 8]
After: 
[1, 6, 4, 3, 7, 8, 2, 5]
[6,  2, 1, 5, 3, 8, 7, 4]
[7, 3, 2, 4, 8, 1, 5, 6]
[5, 3, 4, 1, 2, 6, 8, 7]
[8, 5, 4, 1, 2, 3, 7, 6]