What is an abstract class in Java and how is it used? An abstract class in Java is a class that cannot be instantiated and is intended to be subclassed by other classes. Abstract classes can contain ...

Understanding interfaces and abstract classes and methods in Java. This Java code challenge demonstrates many important concepts about interfaces, abstract methods, and more.

Interface with default methods in java 8in later version of java interfaces always contained only method declaration. we are not giving method definition in the interfaces because java did not allow ...