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]

Next TopicJava Collections Class

← prev next →

Latest Courses

We provides tutorials and interview questions of all technology like java tutorial, android, java frameworks

Contact info

G-13, 2nd Floor, Sec-3, Noida, UP, 201301, India

[email protected].

Python

AI, ML and Data Science

Java

B.Tech and MCA

Web Technology

Software Testing

Technical Interview

Java Interview

Web Interview

Database Interview

Company Interviews

Java Tutorial

Control Statements

Java Object Class

Java Inheritance

Java Polymorphism

Java Abstraction

Java Encapsulation

Java Array

Java OOPs Misc

Java String

Java String Methods

Java Regex

Exception Handling

Java Inner Class

Java Multithreading

Java Synchronization

Java Networking

Java Applet

Java Reflection

Java Conversion

Java JDBC

RMI

Internationalization

Java Array Class

Java AtomicInteger Class

Java AtomicLong Methods

Java Authenticator

Java BigDecimal class

Big Integer Class

Java Boolean class

Java Byte Class

Java Class

Java Collections class

Java Compiler Class

CopyOnWriteArrayList

Java Math Methods

LinkedBlockingDeque

Java Long class

LinkedTransferQueue

Java List

Java MulticastSocket

Java Number Class

Java Phaser Class

ArrayList Methods

Java Thread Methods

Java Projects

Java Programs

Java Misc

Java Date Class

Java ListIterator Class

Java NIO Tutorial

HttpURLConnection

Java Deque

Java HttpCookie Class

Java URL class

Java List Methods

Java Vector class

Java Collection Methods

Java Socket Class

Java Executors

Java Collections swap() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3