Each code element serves a fundamental ... Can have private methods with the implementation (introduced in Java 9). Can have any kind of methods. Let’s explore the main differences between ...

Now let’s look at a few examples of the callback concept in code. Anytime we pass an interface with a method implementation to another method in Java, we are using the concept of a callback ...

Lambdas work when there is only a single function to implement ... methods get thrown into the mix. This discussion on the etymology of lambda functions is interesting, but the real question is how ...