Alstom Transportation Applications Engineer Interview Questions and Answers

Oops in Java stands for Object-Oriented Programming. It is a programming paradigm based on the concept of objects.

• Oops in Java allows for the creation of classes and objects, encapsulation, inheritance, and polymorphism.

• Classes are templates for objects, encapsulation hides the internal state of an object and only exposes necessary functionalities, inheritance allows for the creation of new classes based on existing on...read more

In Java, an object is an instance of a class that contains data and methods.

• Objects are created using the 'new' keyword followed by the class name

• Objects have attributes (fields) and behaviors (methods)

• Example: 'Car' class can have objects like 'myCar' and 'yourCar'

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

• 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: Inheritance in object-oriented programming languages like Java allows for polymorphism.