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 ...

Java’s interface language feature confuses many Java newbies. Many mistakenly assume that interfaces only sidestep Java’s failure to support multiple implementation inheritance.

The Java 2 SDK organizes its vast collection of classes and interfaces into a tree-like hierarchy of packages within packages, which is equivalent to directories within directories.