A class that implements an interface but only gives definitions for some of the method headings given in the interface is called a/an:

A) concrete class
B) abstract class
C) discrete class
D) friendly class

Implements

A keyword in Java used by classes to specify that they will provide implementations for the methods defined in an interface.

Interface

In programming, an interface is a reference type that defines a set of abstract methods that a class must implement.

Concrete Class

A class that has an implementation for all of its methods, as opposed to abstract classes which can contain unimplemented methods.