How-to articles, tricks, and solutions about INTERFACE

An interface is a collection of abstract methods that define a set of functions that a class must implement.

In Java, the extends keyword is used to inherit from a superclass, and the implements keyword is used to implement an interface. Here are the key differences between the two:

An interface defines a set of methods that a class must implement, but does not provide any implementation for those methods.

To pass a method as a parameter in Java, you can use a functional interface and a lambda expression.

In Java, List is an interface that defines a list data structure, while ArrayList is a class that implements the List interface.

In Java, interface variables are static and final by default because that is how they are defined in the Java Language Specification (JLS).