Learn the four types of polymorphism in Java, then start using subtype polymorphism ... in addition to or instead of abstract methods. For example, an abstract Vehicle class might declare fields ...

and "Motorcycle started." respectively. In the main class, objects of Car, Motorcycle, and Vehicle are created. Polymorphism is used to assign them to a reference variable of type Vehicle. It is ...

Polymorphism is one of the fundamental concepts in object-oriented programming (OOP) languages like Java. It allows objects of different classes to be treated as objects of a common superclass. This ...