How do java libraries work?

Question

Java

How do java libraries work? I just don't really understand how it works

Answer 1

It would be nice to be specific about the question. For example, which Java library are we talking about?
In general, let's assume that you have some library with some class Human, which has some method bmi (), which calculates the body mass index (BMI).
And let's say you want to implement the BMI calculation functionality in your application. You include the library in your project (via maven, gradle or without them), import the required class and work with it.
That's all...