Question

I have a class which is supposed to work by definition only with a String parameter.

So I thought about using

class MyClass<T extends String>

But then the compiler gives a warning that string is final and I can’t extend it

Tried then with

class MyClass<String>

And got a warning because the parameter String is hiding class String.

What do I have to do?

Answer 1

Thanks to the enlightening comment: “do you really need generics”?

I reviewed my code and found the problem. I wanted to use a type parameter because I’m implementing an interface with one

interface MyInterface<T>

and for some reason I thought I need the type paramter in the implementing class, like:

class MyClass<String> implements MyInterface<T>

But that doesn’t make sense. What I needed to do is:

class MyClass implements MyInterface<String>

Solved 🙂