Shuffle Elements In Java ArrayList

Chapter: Data Structures Last Updated: 21-07-2016 10:37:25 UTC

Program:

            /* ............... START ............... */
                
import java.util.ArrayList;
import java.util.Collections;

public class JavaArryListShuffle {
	public static void main(String a[]) {
		ArrayList<String> list = new ArrayList<String>();
		list.add("one");
		list.add("two");
		list.add("three");
		list.add("four");
		list.add("five");
		list.add("sixth");
		list.add("seven");

		Collections.shuffle(list);
		System.out.println("Results after shuffle operation:");
		for (String str : list) {
			System.out.println(str);
		}

		Collections.shuffle(list);
		System.out.println("Results after shuffle operation:");
		for (String str : list) {
			System.out.println(str);
		}
	}
}
                /* ............... END ............... */
        

Output

Results after shuffle operation:
sixth
three
four
two
seven
one
five
Results after shuffle operation:
one
sixth
three
four
five
two
seven 

Notes:

  • Shuffling an array or a list means that you are randomly re-arranging the content of that structure.
  • The shuffle(List<?>) method is used to randomly permute the specified list using a default source of randomness.

Tags

Shuffle Elements, Java

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