Failure to prefix the superclass method name with the keyword super and a dot (.) separator when referencing the superclass’s method causes the subclass method to call itself, creating an error …

Type inheritance Subclass entity inherits all attributes and relationships of superclass

super is used to call the constructor of the parent class. Employee parent class. The call using super must be the first statement in the constructor. If the call to the parent constructor is missing, the …

The ability of a subclass to override a method in its superclass allows a class to inherit from a superclass whose behavior is "close enough" and then supplement or modify the behavior of that superclass.

Protected Visibility for Superclass Data private data are not accessible to subclasses! protected data fields accessible in subclasses (Technically, accessible in same package) Subclasses often written …

Warning: if you find yourself wanting to perform (explicit) downcasting from a superclass to a subclass, it is a sign you are likely approaching things the wrong way!

Specialization is the process of defining a set of subclasses of an entity type; this entity type is called the superclass of the specialization. Why we need specialization? Certain attributes may apply to some …