Swap two strings without using any variable

 Swap two strings without using any variable 
public class SwapTwoStringWithoutUsingVaraible {
    public static void main(String[] args) {
    String a="delhi";
    String b="dehradun";
    a= a+b;
    b = a.substring(0,(a.length()-b.length()));
    a = a.substring(b.length(),(a.length()));
    System.out.println("a = "+a);
    System.out.println("b = "+b);
    }
}

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