Java Abstract class

In object-oriented concepts, all objects are depicted by classes, but conversely, not all classes are used to depict objects, and if a class does not contain enough information to depict a specific object, such a class is an abstract class.

Abstract classes In addition to the object cannot be instantiated, other functions of the class still exist, member variables, member methods and construction methods are accessed in the same way as the normal class.

Because an abstract class cannot instantiate an object, an abstract class must be inherited in order to be used. For this reason, it is often decided at the design stage to not design abstract classes.

The parent class contains a common method for the collection of subclasses, but because the parent class itself is abstract, these methods cannot be used.

In Java, an abstract class represents an inheritance relationship in which a class can inherit only one abstract class, while a class may implement multiple interfaces.

Java Abstract class