Write a program to Swap Two Strings without Third String Variable

This Java program swaps the values of two strings without using a third variable. It does so by concatenating the two strings, then extracting the original values by using the substring() method. Here's a breakdown of how the swapping works:

Two strings s1 and s2 are declared and initialized with the values "Tutor" and "Joes", respectively.
The original values of s1 and s2 are printed to the console.
The values of s1 and s2 are concatenated using the + operator and assigned to s1.
The original value of s2 is extracted from s1 by using the substring() method with arguments 0 and s1.length() - s2.length(). This creates a substring of s1 that excludes the characters of s2.
The original value of s1 is extracted from s1 by using the substring() method with argument s2.length(). This creates a substring of s1 that starts at the end of s2.
The display() method is called with the swapped values of s1 and s2.
The swapped values of s1 and s2 are printed to the console by the display() method.

Source Code

class Swap_Without_Third
{
	public static void main(String[] args)
	{
		String s1 = "Tutor";
		String s2 = "Joes";
		System.out.println("Before Swap String 1 :"+s1);
		System.out.println("Before Swap String 2 :"+s2);
		s1 = s1 + s2;
		s2 = s1.substring(0, s1.length() - s2.length());
		s1 = s1.substring(s2.length());
		display(s1, s2);
	}
	private static final void display(String s1, String s2)
	{
		System.out.println("After Swap String 1 :"+s1);
		System.out.println("After Swap String 2 :"+s2);
	}
}

Output

Before Swap String 1 :Tutor
Before Swap String 2 :Joes
After Swap String 1 :Joes
After Swap String 2 :Tutor

Write a program to Swap Two Strings without Third String Variable

Source Code

Output

Example Programs

String Programs in Java