Java interfaces are different from classes, and it’s important to know how to use their special properties in your Java programs. This tutorial introduces the difference between classes and ...

The Java Iterator is an all-purpose interface that simplifies looping through a collection of objects. Java's ListIterator provides all the functionality of the Iterator interface, with four ...

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 Java, an "interface" is an abstract base class that only serves the purpose of a template for other classes. The Comparable interface defines methods that allow objects to be sorted based on ...

At the base of the Framework are the interfaces java.util.Collection and java.util.Map. The Collection interface represents just a group of objects, with no particular order or restriction.

Java also lets you declare interfaces inside of interfaces. In this case, a nested interface is a static member of its enclosing interface, and once again the static keyword is redundant.