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Shuffle elements of ArrayList with Java Collections
In order to shuffle elements of ArrayList with Java Collections, we use the Collections.shuffle() method. The java.util.Collections.shuffle() method randomly permutes the list using a default source of randomness.
Declaration −The java.util.Collections.shuffle() method is declared as follows −
public static void shuffle(List <?> list)
Let us see a program to shuffle elements of ArrayList with Java Collections −
Example
import java.util.*;
public class Example {
public static void main (String[] args) {
ArrayList<Integer> list = new ArrayList<Integer>();
list.add(1);
list.add(2);
list.add(7);
list.add(8);
list.add(3);
list.add(9);
System.out.println("Original list : " + list);
Collections.shuffle(list); // shuffling the list
System.out.println("Shuffled list : " + list);
}
}Output
Original list : [1, 2, 7, 8, 3, 9] Shuffled list : [3, 8, 7, 9, 1, 2]
Updated on: 25-Jun-2020
3K+ Views
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