20+ Bharti Airtel Interview Questions and Answers

I am familiar with Java, Python, and JavaScript. During lockdown, I learned React and Node.js.

• Familiar with Java, Python, and JavaScript

• Learned React and Node.js during lockdown

Find the 2nd greatest in 2 different ways

• Sort the array and return the second largest element

• Use a loop to find the largest element and then find the second largest element

• Use a priority queue to find the second largest element

Program to find the smallest value from 3 inputs.

• Compare the first two inputs and store the smaller value.

• Compare the stored value with the third input and update if smaller.

• Return the final stored value as the smallest value.

Polymorphism in programming refers to the ability of a function or method to behave differently based on the object it is called with.

• 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 Java allows a subclass to override a method of its superclass, exhibiting polymorphic behavior.

Functional testing checks if the software functions as expected, while non-functional testing checks other aspects like performance and usability.

• Functional testing focuses on the specific functions of the software.

• Non-functional testing focuses on aspects like performance, usability, security, and scalability.

• Examples of functional testing include unit testing, integration testing, and system testing.

• Examples of non-functional testing include load testing, stress testing, an...read more

Linear search checks each element in a list sequentially, while binary search divides the list in half at each step.

• Linear search has a time complexity of O(n), while binary search has a time complexity of O(log n).

• Linear search is used for unsorted lists, while binary search is used for sorted lists.

• Example: Linear search - searching for a name in a phone book. Binary search - searching for a word in a dictionary.

Yes, GD-one time use plastic should be banned.

• One-time use plastic is harmful to the environment and wildlife.

• Alternatives like reusable bags and containers are readily available.

• Many countries and cities have already implemented bans on single-use plastics.

• Reducing plastic waste is crucial for the health of our planet.

Smoke testing is a quick test to check if the basic functionalities of the software are working, while sanity testing is a more thorough test to check if the specific features are working as expected.

• Smoke testing is a shallow and wide test, while sanity testing is a deep and narrow test.

• Smoke testing is done to ensure the stability of the system, while sanity testing is done to ensure the rationality of the system.

• Smoke testing is usually done before sanity testing in the te...read more

To create a table, use SQL CREATE TABLE statement with column names and data types.

• Specify the table name after CREATE TABLE keyword

• List column names and data types separated by commas inside parentheses

• Add any constraints like PRIMARY KEY or FOREIGN KEY if needed

• Example: CREATE TABLE customers (id INT PRIMARY KEY, name VARCHAR(50), email VARCHAR(100))

Overloading is the ability to have multiple methods with the same name but different parameters.

• Overloading allows for more flexibility in method naming and usage.

• The methods must have different parameters, such as different data types or different numbers of parameters.

• Example: public void print(int num) and public void print(String str) are both methods with the same name but different parameters.

• Overloading is determined at compile time based on the method signature.

A program to print all prime numbers up to a given limit.

• Iterate through numbers up to the limit

• For each number, check if it is divisible by any number from 2 to its square root

• If it is not divisible, print it as a prime number

Overriding is a feature in object-oriented programming where a subclass provides its own implementation of a method that is already defined in its superclass.

• Overriding allows a subclass to provide a specific implementation of a method that is already defined in its superclass.

• The method signature (name, parameters, and return type) must be the same in both the superclass and subclass.

• The subclass method must have the same or a more accessible access modifier than the supercl...read more

Decorators in software engineering are functions that modify the behavior of other functions or methods.

• Decorators are used to add functionality to existing functions without modifying their code.

• They are commonly used in Python to add additional behavior to functions or classes.

• Decorators are implemented using the @ symbol followed by the decorator function name.

• They can be used for logging, authentication, caching, and more.

• Example: @staticmethod decorator in Python marks a...read more

Abstraction is the process of hiding complex implementation details and exposing only the necessary information.

• Abstraction is a way to manage complexity by breaking down a system into smaller, more manageable parts.

• It allows us to focus on the essential features of a system while ignoring the non-essential details.

• Abstraction can be achieved through the use of interfaces, abstract classes, and encapsulation.

• For example, a car can be abstracted as a vehicle with certain prope...read more

Java is a popular programming language used for developing various applications. Polymorphism is a concept in object-oriented programming where a single function or method can be used to perform different actions based on the object it is called with.

• Java is a high-level, class-based, object-oriented programming language.

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

• There are two types of polymorphism in Java: compile-time (m...read more

Object-oriented programming concepts that focus on objects and classes for better code organization and reusability.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features of an object.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reusability and saves time and effort in writing new code.

• The existing class is called the parent or base class, and the new class is called the child or derived class.

• The child class inherits all the properties and methods of the parent class and can also add its own unique properties and methods.

• For example, a class 'An...read more

OOPS concepts are the principles of Object-Oriented Programming that help in designing and implementing software systems.

• Encapsulation - bundling of data and methods that operate on that data

• Inheritance - ability of a class to inherit properties and methods from a parent class

• Polymorphism - ability of objects to take on multiple forms or behaviors

• Abstraction - hiding of complex implementation details and showing only necessary information

• Objects - instances of classes that en...read more

STLC focuses on testing software while SDLC focuses on developing software.

• STLC (Software Testing Life Cycle) involves planning, designing, executing, and reporting on tests.

• SDLC (Software Development Life Cycle) involves planning, designing, coding, testing, and maintenance of software.

• STLC ensures that the software meets quality standards, while SDLC ensures that the software meets user requirements.

• Example: In STLC, test cases are designed and executed to validate the func...read more

Data binding in Angular is a way to automatically synchronize data between the model and the view.

• Data binding allows you to bind data from the component to the view and vice versa.

• There are two types of data binding in Angular: one-way binding and two-way binding.

• One-way binding updates the view when the model changes, while two-way binding updates both the model and the view simultaneously.

• Example: {{ data }} in HTML template binds data from the component to the view.

Tight deadlines, communication issues, technical constraints

• Tight deadlines required efficient time management and prioritization

• Communication issues among team members led to misunderstandings and delays

• Technical constraints like limited resources or outdated technology posed challenges

Implement a function to filter out strings starting with a specific letter using Java 8.

• Use Java 8 Stream API to filter the strings based on a condition.

• Use lambda expressions to define the filtering condition.

• Use the 'filter' method of Stream to apply the filtering condition.

To search from Chrome, type your query in the address bar or use the search bar on the new tab page.

• Type your query in the address bar and press enter

• Use the search bar on the new tab page

• You can also use keyboard shortcuts like Ctrl+T to open a new tab and Ctrl+L to focus on the address bar

Object class is the superclass of all classes in Java.

• Object class provides basic functionalities like toString(), equals(), hashCode() etc.

• All classes in Java directly or indirectly inherit from Object class.

• Object class is located in java.lang package.

• Example: String class extends Object class.