WNS Software Developer Interview Questions and Answers

Q1. Hash map implementation
Ans. 
Hash map is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hash map uses a hash function to map keys to indices in an array.

• Collision handling is important in hash map implementation.

• Common operations include adding, removing, and retrieving key-value pairs.

• Example: HashMap map = new HashMap<>();
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Q2. About software development models
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Q1. Palindrome code
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Q2. Delete all the distinct records
Ans. 
To delete all distinct records, use a query to identify and remove duplicate entries.
• Identify distinct records using a query

• Delete duplicate entries from the database
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10 day,Numbers,Alebra

Q1. Oop,C++.html,css,javascrept
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Q2. What is order list
Ans. 
An ordered collection of items, typically displayed in a numbered list.
• Order list is used to display items in a specific sequence.

• Items in an order list are typically numbered or marked with bullets.

• Example:

  1. Item 1
  2. Item 2
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Q3. What is javascript
Ans. 
JavaScript is a high-level, interpreted programming language used for creating interactive websites.
• JavaScript is commonly used for client-side web development.

• It can be used to add interactivity to websites, such as form validation or dynamic content.

• JavaScript can also be used for server-side development with Node.js.

• Examples of JavaScript frameworks/libraries include React, Angular, and Vue.
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Q4. What is ===operator
Ans. 
=== operator is a strict equality operator in JavaScript that checks if two values are equal in both value and type.
• === operator returns true if both operands are of the same type and have the same value

• It does not perform type coercion, unlike the == operator

• Example: 5 === '5' will return false because the operands are of different types
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Q5. What is the main features of oop
Ans. 
Main features of OOP include encapsulation, inheritance, and polymorphism.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability to create new classes based on existing classes, inheriting their attributes and methods.

• Polymorphism: Ability for objects of different classes to respond to the same message in different ways.

• Example: Encapsulation - a class 'Car' wi...read more
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Cat level maths are to be solved

Java coding basic questions

Coding interviews test candidates' technical knowledge, coding ability, problem solving skills, and creativity, typically on a whiteboard.

A detail assignment is the temporary placement of a career employee in another established position that is vacant or from which the incumbent is absent.

An aptitude test is a way for employers to assess a candidate's abilities through a variety of different testing formats. Aptitude tests will test your ability to perform tasks and react to situations at work. This includes problem-solving, prioritisation and numerical skills, amongst other things.

Q1. Consider the tools and skills necessary for the role. Think about the basic requirements of the job. ...
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Q2. Study helpful books and digital publications. .
Ans. For books about studying productively, I think you'd be hard-pressed to find better than Eat That Frog – For Students by Brian Tracy and Anna Leinberger, The Productivity Project and Hyperfocus by Chris Bailey, The Procrastination Equation by Dr Piers Steel and Deep Work by Cal Newport.
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Q3. Take the time you need
Ans. Said to mean that you can spend as much time as you need in doing something, or that you should slow down
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General discussion checks communications

Basic logical program like palindrome