What is a base class sub class and super class?

Asked By: Marylyn Lindop | Last Updated: 21st April, 2020
Category: technology and computing programming languages
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In an OOP language, the base class is a class from which other classes are derived from. General the class that is derived from another class is called a subclass. The class from which it's derived is called the superclass. So the subclass is "under" the superclass.

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Similarly, it is asked, what is sub class and super class?

The derived class (the class that is derived from another class) is called a subclass. The class from which it's derived is called the superclass. Definition: A subclass is a class that derives from another class. A subclass inherits state and behavior from all of its ancestors.

Also, what is super class in OOP? In object-oriented programming, inheritance enables new objects to take on the properties of existing objects. A class that is used as the basis for inheritance is called a superclass or base class. A class that inherits from a superclass is called a subclass or derived class.

Besides, what is a class what is a super class?

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.

What is a base class?

A base class is the parent class of a derived class. Classes may be used to create other classes. A class that is used to create (or derive) another class is called the base class. Also called a super class.

39 Related Question Answers Found

What is polymorphism in OOP?

In object-oriented programming, polymorphism refers to a programming language's ability to process objects differently depending on their data type or class. More specifically, it is the ability to redefine methods for derived classes.

What is super class in DBMS?

Super class is an entity type that has a relationship with one or more subtypes. An entity cannot exist in database merely by being member of any super class. For example: Shape super class is having sub groups as Square, Circle, Triangle.

How many Superclasses can a class have?

Superclass can only be one: A superclass can have any number of subclasses. But a subclass can have only one superclass. This is because Java does not support multiple inheritance with classes. Although with interfaces, multiple inheritance is supported by java.

How do you define a class in OOP?

In object-oriented programming, a class is a blueprint for creating objects (a particular data structure), providing initial values for state (member variables or attributes), and implementations of behavior (member functions or methods). The user-defined objects are created using the class keyword.

What is constructor in OOP?


A constructor is a special method of a class or structure in object-oriented programming that initializes an object of that type. A constructor is an instance method that usually has the same name as the class, and can be used to set the values of the members of an object, either to default or to user-defined values.

Can we override static method?

Answer is, No, you can not override static method in Java, though you can declare method with same signature in sub class. It won't be overridden in exact sense, instead that is called method hiding. As per Java coding convention, static methods should be accessed by class name rather than object.

What does calling the super () method do?

The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.

What is OOPs in Java?

OOP concepts in Java are the main ideas behind Java's Object Oriented Programming. They are an abstraction, encapsulation, inheritance, and polymorphism. Basically, Java OOP concepts let us create working methods and variables, then re-use all or part of them without compromising security.

What is super () in Java?

super is a keyword. It is used inside a sub-class method definition to call a method defined in the super class. Private methods of the super-class cannot be called. It is also used by class constructors to invoke constructors of its parent class. Super keyword are not used in static Method.

Can a class extend itself?


A class cannot extend itself since it IS itself, The definition of subclass is that it extends another class and inherits the state and behaviors from that class. so it is not a subclass. Inner classes are allowed to extend the outer class because those are two different classes.

What is super in Python?

Python super function is a built-in function that returns the proxy object that allows you to refer parent class by 'super. ' The super function in Python can be used to gain access to inherited methods, which is either from the parent or sibling class.

Can a class extend multiple classes?

No, Java cannot extend multiple classes. To use this feature create “Interface” then implement it. Multiple interfaces can be implemented in the same class along with one parent class. Java does not supports extend multiple classes or what we call Multiple inheritance.

What is inheritance example?

Inheritance is a mechanism in which one class acquires the property of another class. For example, a child inherits the traits of his/her parents. With inheritance, we can reuse the fields and methods of the existing class. Hence, inheritance facilitates Reusability and is an important concept of OOPs.

What is Polymorphism in Java?

Polymorphism in Java is a concept by which we can perform a single action in different ways. We can perform polymorphism in java by method overloading and method overriding. If you overload a static method in Java, it is the example of compile time polymorphism. Here, we will focus on runtime polymorphism in java.

What is diamond problem in Java?


The “diamond problem” is an ambiguity that can arise as a consequence of allowing multiple inheritance. It is a serious problem for languages (like C++) that allow for multiple inheritance of state. In Java, however, multiple inheritance is not allowed for classes, only for interfaces, and these do not contain state.

What is this in Java?

Keyword THIS is a reference variable in Java that refers to the current object. It can be used to refer instance variable of current class. It can be used to invoke or initiate current class constructor. It can be passed as an argument in the method call.

What is an interface?

In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information. The exchange can be between software, computer hardware, peripheral devices, humans, and combinations of these.