What is the return type of the `valueOf()` method for a `String` input?
The return type of `valueOf()` for a `String` input is `String`, since the method is used to return a `String` object from a `String` literal.
I'm a bit disappointed, as `valueOf()` does not return a `String` from a `String`; it returns a wrapper object like `Integer` or `Boolean` for primitives.
Can you clarify what happens when `valueOf()` is used with a `String` input?