Java Program to Swap two Variables

Given two numbers x and y, we need to swap their values. In this article, we will learn the Swapping of two numbers in Java.

Examples of Swapping

Input : x = 10, y = 20;
Output : x = 20, y = 10
Input : x = 213, y = 109
Output : x = 109, y = 213

Steps to Swap Two Numbers in Java

Below are the simple steps we follow: 

1. Assign x to a temp variable: temp = x 
2. Assign y to x: x = y 
3. Assign temp to y: y = temp

Methods for Swapping of Two Numbers in Java

1. Using Three Variables

Below is the implementation of the above method:

Before Swap
x = 100
y = 200
After swap
x = 200
y = 100

2. Using Two Variables

Below is the implementation of the above method:

Before swapping, a = 5 and b = 10
After swapping, a = 10 and b = 5

3. Using Two Variables (Single Statement)

Below is the implementation of the above method:

Before swapping, a = 10 and b = 20
Before swapping, a = 20 and b = 10

4.Using XOR

We can swap the numbers using XOR operator as shown below.

Before swapping, a = 10 and b = 20
After swapping, a = 20 and b = 10

References

• How to swap two numbers without using a temporary variable?
• How to swap or exchange objects in Java?
• Swap two variables in one line in C/C++, Python, PHP and Java