Swap two strings in Java, by passing them to a utility function, but without returning objects or using wrapper classes

Question

I am trying to swap two strings in Java. I never really understood \"strings are immutable\". I understand it in theory, but I never came across it in practice.

Also

Answer 1

The s1 and s2 variables in your function swap are local to that function.

You need to define s1 and s2 as private variables for your class, or return an array of strings from your function.