// Abstract class needs to be extended and its method implemented. // It cannot be instantiated.

Java has two mechanisms to define a type that permits multiple implementations: interfaces and abstract classes. Since the introduction of default methods for interfaces in Java 8 [JLS 9.4.3], both ...

Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields, ...

Due to Java’s Reflection API we have been able to inspect and alter program execution at runtime. In particular, we can observe interfaces/classes/methods and fields at runtime without knowing their ...