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Submitted by: M S Sridhar(sridhar.ms@gmail.com)

Monday Jul 23rd 2018 by M S Sridhar

Language: Java, Expertise: Intermediate - See how to use the rotate method in Collections.

See how to use the rotate method in Collections to rotate the elements to a specified position.

import java.util.*;

public class UsingRotateInCollections {
   
   public static void main(String args[])
   {
      UsingRotateInCollections usingRotateInCollections = new UsingRotateInCollections();
      usingRotateInCollections.proceed();
   }
   
   private void proceed()
   {
      //Creating  a list with default values
      List defaultList = new ArrayList();

      defaultList.add(1);
      defaultList.add(2);
      defaultList.add(3);
      defaultList.add(4);
      defaultList.add(5);
      defaultList.add(6);
      defaultList.add(7);
      defaultList.add(8);

      System.out.println("List as added: " + Arrays.toString(defaultList.toArray()));
      Collections.rotate(defaultList, 2); //Rotating the list elements by 2 positions
      System.out.println("List after rotate with 2 positions: "+Arrays.toString(defaultList.toArray()));
   }
}

/*

Expected output:

[root@mypc]# java UsingRotateInCollections
List as added: [1, 2, 3, 4, 5, 6, 7, 8]
List after rotate with 2 positions: [7, 8, 1, 2, 3, 4, 5, 6]

*/ 
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