What is the difference between a superclass and a subclass?

The difference between the Superclass and Subclass is that Superclass is the existing class from which new classes are derived while Subclass is the new class that inherits the properties and methods of the Superclass.

Do subclasses inherit relationships?

We say that an entity that is a member of a subclass inherits all the attributes of the entity as a member if superclass. The entity in the subclass also inherits all the relationships in which the superclass participates.

Can subclasses have relationships?

The association is one to one and the subclasses are disjoint. There is nothing in principle that prohibits associations of any type between subclasses of any kind.

What happens if both superclass and subclass have a field with same name?

what happens if both superclass and subclass have a field with same name? Sub class field will hide the Super class field. Hidden super class field in sub class can be accessed using super keyword.

What is the best example of superclass and subclass relationship?

An example is: Car, Truck and Motorcycle are all subclasses of the superclass Vehicle. They all inherit common attributes from vehicle such as speed, colour etc. while they have different attributes also i.e Number of wheels in Car is 4 while in Motorcycle is 2.

What is the relationship of a conceptual superclass to a subclass?

What is the relationship of a conceptual superclass to a subclass? A conceptual superclass definition is more general or encompassing than a subclass definition. For example, consider the superclass Payment and its subclasses (CashPayment, and so on).

What is the example of superclass subclass relationship?

A subclass is a class derived from the superclass. It inherits the properties of the superclass and also contains attributes of its own. An example is: Car, Truck and Motorcycle are all subclasses of the superclass Vehicle.

What does a subclass inherit from a superclass?

A subclass inherits all the members (fields, methods, and nested classes) from its superclass. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.

What are the superclass and subclass entity?

A superclass is the class from which many subclasses can be created. The subclasses inherit the characteristics of a superclass. The superclass is also known as the parent class or base class. In the above example, Vehicle is the Superclass and its subclasses are Car, Truck and Motorcycle.

What are the constraints on a subclass and parent class entity?

There are three constraints that may apply to a specialization/generalization: membership constraints, disjoint constraints and completeness constraints. User defined: Sometimes the designer can define the superclass-subclass relationship.

When methods in the superclass and subclass have same name and signature What are they called?

Answer: When methods in the superclass and subclass have the same name and signature is called Overridden methods.

Is superclass and subclass have same variable name?

5. If super class and subclass have same variable name, which keyword should be used to use super class? Explanation: Super keyword is used to access hidden super class variable in subclass.

What is a subclass of a superclass?

Subclasses. A subclass is a class derived from the superclass. It inherits the properties of the superclass and also contains attributes of its own. An example is: Car, Truck and Motorcycle are all subclasses of the superclass Vehicle. They all inherit common attributes from vehicle such as speed, colour etc.

Can a subclass access the private members of its superclass?

• A subclass cannot access the private members of its superclass, but it can access the non- private members. • A subclass can invoke a constructor of its superclass by using the keyword super, followed by a set of parentheses containing the superclass constructor arguments.

Can my subclass inherit from many superclasses?

For example, any time you use a JFrame object, you’re at the end of a long line of inheritance: In Java, when a subclass inherits from a superclass, it’s known as “extending” the superclass. Can My Subclass Inherit From Many Superclasses? No. In Java, a subclass can only extend one superclass.

Can a superclass method be overridden in a subclass?

• A superclass method can be overridden in a subclass to declare an appropriate implementation for the subclass. • The @Override annotation (p. 369) indicates that a method should override a superclass method.