Java Collections swap() Method

The swap() method of Java Collections class is used to swap the elements at the specified positions in the specified list.

Syntax

Following is the declaration of swap() method:

Parameter

Parameter	Description	Required/Optional
list	It is the list in which we will swap the elements.	Required
i	It is the index of one element to be swapped.	Required
j	It is the index of the other element to be swapped.	Required

Returns

The swap() method does not return anything.

Exceptions

IndexOutOfBoundsException- It will thrown this exception if the i or j is out of range.

Compatibility Version

Java 1.4 and above

Example 1

import java.util.*;
public class CollectionsSwapExample1 {
	public static void main (String[] args) {
		//Create a list with items
            ArrayList<String>  list = new ArrayList<String>();
            list.add("Java");
            list.add("Android");
            list.add("Python");
            list.add("Node.js"); 
            System.out.println("Original List : " +list);
            //Perform swapping
            Collections.swap(list, 0, 2);
            System.out.println("List after swapping : " +list);
	      }
}

Test it Now

Output:

Original List : [Java, Android, Python, Node.js]
List after swapping : [Python, Android, Java, Node.js]

Example 2

import java.util.*;
public class CollectionsSwapExample2 {
	public static void main (String[] args) {
	    //Create a list with items
	    List<Integer> list = Arrays.asList(44, 55, 99, 77, 88, 66);
          System.out.println("List before swapping: "+list);
          Collections.swap(list, 2, 5);
          System.out.println("List after swapping: "+list);
	    }
}

Test it Now

Output:

List before swapping: [44, 55, 99, 77, 88, 66]
List after swapping: [44, 55, 66, 77, 88, 99]

Example 3

import java.util.*;
public class CollectionsSwapExample3 {
	public static void main (String[] args) {
		//Create a list with items
		List<Integer> list = Arrays.asList(44,55,99,77,88,66,33,22);
		System.out.println("List before swapping: "+list);
		Scanner sc = new Scanner(System.in);
		System.out.print("Enter index i : ");
		int i = sc.nextInt();
		System.out.print("Enter index j : ");
		int j = sc.nextInt();     
            Collections.swap(list, i, j);
            System.out.println("List after swapping: "+list);
            sc.close();
	      }
}

Test it Now

Output:

List before swapping: [44, 55, 99, 77, 88, 66, 33, 22]
Enter index i : 2
Enter index j : 7
List after swapping: [44, 55, 22, 77, 88, 66, 33, 99]

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Java Collections swap() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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