PCS Technology Java Developer Interview Questions, Process, and Tips

Polymorphism is the ability of a single function or method to operate on different data types.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example of runtime polymorphism is method overriding in inheritance.

• Example of compile-time polymorphism is method overloading w

Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the user.

• Abstraction allows developers to focus on what needs to be done rather than how it is done

• It helps in reducing complexity and improving code readability

• Examples include abstract classes and interfaces in Java

Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.

• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct access from outside the class.

• Encapsulation also helps in achieving data abstraction, where the internal details of an object are hidden from the outside world.

• Examp...read more

Object Class is the root class for all Java classes and provides methods for object manipulation.

• Root class for all Java classes

• Provides methods for object manipulation

• Contains methods like equals(), hashCode(), toString()

• Used for inheritance and polymorphism

Encapsulation, class, object, and polymorphism are key concepts in object-oriented programming.

• Encapsulation: Encapsulation is the bundling of data and methods that operate on the data into a single unit. For example, a Car class may encapsulate attributes like make, model, and methods like start() and stop().

• Class: A class is a blueprint for creating objects. It defines the properties and behaviors that objects of the...read more