Program to swap two string variables without using third or temp variable.

public class SwapStrings {
public static void main(String[] args) {
String s1 = “Hello”;
String s2 = “World”;
s1 = s1 + s2;
s2 = s1.substring(0, s1.length() – s2.length());
s1 = s1.substring(s2.length());
System.out.println(“s1: ” + s1 + ” s2: ” + s2);
}
}

Output: