Java Collections reverse() Method

The reverse() method of Java Collections class is used to reverse the order of the elements in the specified list.

Syntax

Following is the declaration of reverse() method:

Parameter

Parameter	Description	Required/Optional
list	It is the list whose elements are to be reversed.	Required

Returns

The reverse() method does not return anything.

Exceptions

Compatibility Version

Java 1.2 and above

Example 1

import java.util.*;
public class CollectionsReverseExample1 {
	public static void main(String[] args) {		
		//Create a list of strings
            List<String>  mylist = new ArrayList<String>();
            mylist.add("Java");
            mylist.add("PHP");
            mylist.add("Python");
            mylist.add("COBOL");
            System.out.println("Original List:- " + mylist);      
            Collections.reverse(mylist);
            System.out.println("Modified List:- " + mylist);
	      }
}

Test it Now

Output:

Original List:- [Java, PHP, Python, COBOL]
Modified List:- [COBOL, Python, PHP, Java]

Example 2

import java.util.*;
public class CollectionsReverseExample2 {
	public static void main(String[] args) {		
		//Create a list of Integer
            List<Integer>  mylist = new ArrayList<Integer>();
            mylist.add(1);
            mylist.add(2);
            mylist.add(3);
            mylist.add(4);
            System.out.println("Original List:- " + mylist);      
            Collections.reverse(mylist);
            System.out.println("Modified List:- " + mylist);
	      }
}

Test it Now

Output:

Original List:- [1, 2, 3, 4]
Modified List:- [4, 3, 2, 1]

Example 3

import java.util.*;
public class CollectionsReverseExample3 {
	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));       
            Collections.reverse(Arrays.asList(arr));         
            System.out.println("Modified Array : " +Arrays.toString(arr));
	      }
}

Test it Now

Output:

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

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Java Collections reverse() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3