Generics

In the last section, we learned how interfaces and abstract classes help us write reusable code for different types of objects. But sometimes we want to write one class or method that can work with many data types without rewriting the same logic again and again. That is where generics come in.

What Are Generics?

Generics let you write code using a placeholder type instead of a real type right away. Then later, when you create the object or call the method, you choose what type should be used.

Think of it like making a container that can hold one kind of data, but you decide what kind when you use it.

In Java, a generic type is often written with angle brackets like this: