London Stock Exchange Group Engineer Trainee Interview Questions and Answers

Encapsulation, Inheritance, Polymorphism, Abstraction

• Encapsulation: Data hiding and bundling of data with methods. Example: Using private variables and public methods.

• Inheritance: Reusing code and creating a hierarchy of classes. Example: Subclass inheriting properties and methods from a superclass.

• Polymorphism: Ability to present the same interface for different data types. Example: Method overloading and overriding.

• Abstraction: Hiding complex implementation details and show...read more

Structure languages focus on procedures and functions, while object-oriented languages focus on objects and classes.

• Structure languages use functions and procedures to manipulate data

• Object-oriented languages use objects and classes to encapsulate data and behavior

• Structure languages are more procedural in nature, while object-oriented languages are more modular and reusable

• Examples of structure languages include C and Pascal

• Examples of object-oriented languages include Java ...read more

OOPS concepts are fundamental to object-oriented programming and include inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: A child class inherits properties and behaviors from a parent class. Example: Animal class can be a parent class with child classes like Dog and Cat inheriting its attributes.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: A car object encapsulates data like speed and methods like acceler...read more

The system architecture diagram for a web application project visually represents the components and their interactions.

• Include components like client-side interface, server-side application, database, and external services

• Show how these components communicate with each other

• Consider scalability, security, and performance in the design

• Use standard symbols and notations for clarity

The static keyword in programming is used to declare variables, functions, or classes that retain their values or state throughout the program's execution.

• Static variables retain their values between function calls

• Static functions can only be accessed within the same file

• Static classes cannot be instantiated and have limited visibility

• Static keyword can also be used in C++ to declare class members shared among all instances