Terms of the offer
When inheriting an abstract class , a concrete child class must define the abstract methods, whereas an abstract class can extend another abstract class and abstract methods from the parent class don't have to be defined. Learn how to use abstract classes and methods in Java to share code among related classes or specify behavior of data types. See examples, comparisons with interfaces, and a drawing application. In Java, abstract is a non-access modifier in java applicable for classes , and methods but not variables. It is used to achieve abstraction which is one of the pillars of Object Oriented Programming (OOP). Following are different contexts where abstract can be used in Java. Characteristics of Java Abstract Keyword In Java, the abstract keyword is used to define abstract classes and methods. Here are some of its key characteristics: Abstract classes cannot be instantiated: An abstract class ...
