What is encapsulation and inheritance in Java?

What is encapsulation and inheritance in Java?

Encapsulation is one of the four fundamental OOP concepts. The other three are inheritance, polymorphism, and abstraction. Encapsulation in Java is a mechanism of wrapping the data (variables) and code acting on the data (methods) together as a single unit. Therefore, it is also known as data hiding.

Is inheritance a form of abstraction?

Abstraction is the concept while inheritance is a technical realization. Abstraction in general refers to the leaving out of (unnecessary) details. The opposite direction is concretization. Generalization is also often used in this context and basically means the same as abstraction.

How is polymorphism related to inheritance?

Inheritance is one in which a new class is created (derived class) that inherits the features from the already existing class(Base class). Whereas polymorphism is that which can be defined in multiple forms. Inheritance supports the concept of reusability and reduces code length in object-oriented programming.

When to use encapsulation vs.inheritance in Java?

Peter Coad and Mark Mayfield make a case that, when using inheritance, encapsulation is inherently weakened within a class hierarchy. They discuss a specific risk: Inheritance indicates strong encapsulation with other classes, but weak encapsulation between a superclass and its subclasses.

What is the difference between inheritance, encapsulation and polymorphism?

Through abstraction, the user/programmer using the encapsulated class doesn’t need to know the values of variables or the implementation of the methods. They just need to know which method to call to do which task. Polymorphism is the ability of an object to take on many forms. In OOP, polymorphism is achieved through inheritance.

What’s the difference between inheritance and encapsulation in OOP?

In OOP, inheritance is beneficial because it allows for code reusability and polymorphism. Encapsulation is a mechanism of wrapping the properties together as a single unit. In OOP, think of a class as an encapsulated unit of states (variables) and behaviours (methods/functions).

What’s the difference between encapsulation and data hiding?

As in encapsulation, the data in a class is hidden from other classes, so it is also known as data-hiding. Encapsulation can be achieved by Declaring all the variables in the class as private and writing public methods in the class to set and get the values of variables.