Java Collections rotate() Method

The rotate() method of Java Collections class is used to rotate the elements in the specified list by a given distance.

Syntax

Following is the declaration of rotate() method:

Parameter

Parameter	Description	Required/Optional
list	It is the list which will be rotated.	Required
distance	It is the distance which will rotate the list. It may be zero, negative, or greater than size of list.	Required

Returns

The rotate() method does not return anything.

Exceptions

UnsupportedOperationException- It throws this type of exception if the specified list or its list-iterator does not support the set operation.

Compatibility Version

Java 1.4 and above

Example 1

import java.util.*;
public class CollectionsRotateExample1 {
	public static void main(String[] args) {		       
		//Let us create a list of strings
            List<String>  mylist = new ArrayList<String>();
            mylist.add("Java");
            mylist.add("Python");
            mylist.add("Cobol");
            mylist.add("Perl");
            mylist.add("Android");
            System.out.println("Original List : " + mylist);  
            //Rotate the element by distance 3
            Collections.rotate(mylist, 3);  
            System.out.println("Rotated List: " + mylist);
	      }
}

Test it Now

Output:

Original List : [Java, Python, Cobol, Perl, Android]
Rotated List: [Cobol, Perl, Android, Java, Python]

Example 2

import java.util.*;
public class CollectionsRotateExample2 {
	public static void main(String[] args) {		       
		//Create array list object
	      List<Integer> num = new ArrayList<>();
	      //Add values in the list
	      for (int i = 1; i <= 10; i++) {
	         num.add(i);
	      }
	      System.out.println("Value Before Rotation: "+Arrays.toString(num.toArray()));
	      //Rotate the list at distance 5
	      Collections.rotate(num, 5);
	      System.out.println("Value After Rotation: "+Arrays.toString(num.toArray()));
	      }
}

Test it Now

Output:

Value Before Rotation: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Value After Rotation: [6, 7, 8, 9, 10, 1, 2, 3, 4, 5]

Example 3

import java.util.*;
public class CollectionsRotateExample3 {
	public static void main(String[] args) {		       
		//Create an array of integers
            Integer arr[] = {10, 20, 30, 40, 50}; 
            System.out.println("Original Array: "+Arrays.toString(arr));    
            //Rotating an array by distance -2
            Collections.rotate(Arrays.asList(arr), -2);         
            System.out.println("Modified Array: "+Arrays.toString(arr));
	      }
}

Test it Now

Output:

Original Array: [10, 20, 30, 40, 50]
Modified Array: [30, 40, 50, 10, 20]

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Java Collections rotate() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3