In this Java 101 tutorial, I’ve explained how interfaces differ from classes, and showed you how to declare, implement, and extend interfaces in your Java programs.

When to use interfaces in Java Interfaces are very useful for decoupling code and implementing polymorphism. We can see an example in the JDK, with the List interface: ...

Implementing Interfaces: When a class implements an interface, you can think of the class as signing a contract, agreeing to perform the specific behaviors of the interface. If a class does not ...

If you want to take advantage of sorting methods in Java, you'll need to implement the Comparable interface.

Many developers get intimidated when they look at all the new APIs that accept lambda expressions as arguments, and wonder how they’ll ever figure out which Java function to use and what the proper ...

In computer programming, a collection is defined as a group of objects. In Java, a collection is any class or interface that implements the Collection interface. Commonly used implementing classes ...