In this tutorial, we will discuss a detailed step-by-step guide for swapping two numbers without using a third variable in Java. This is a commonly asked question in Java interviews and Automation Testing. Through this Java program, interviewers aim to evaluate your logical skills and knowledge of Java programming.

Example:

package TestAutomationCentral;

public class SwapNumber {
    public static void main(String[] args) {
        //TestAutomationCentral.com
        //Swap two numbers without third variable
        int x = 2, y = 4;
        System.out.println("Before Swap");
        System.out.println("x: " + x + "\n" + "y: " + y);
        x = x + y;
        y = x - y;
        x = x - y;
        System.out.println("After Swap");
        System.out.println("x: " + x + "\n" + "y: " + y);
    }
}