Mu Sigma Java Developer Interview Questions and Answers

Q1. Coding to find the excel column name using given number
Ans. 
Convert given number to Excel column name
• Use ASCII values to map numbers to characters (A=65, B=66, ...)

• Divide the number by 26 to get the column name

• Handle edge cases like 'Z' and multiple characters
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Q2. Streams program to find the numbers divisible by2
Ans. 
Using Java streams to find numbers divisible by 2
• Use Java streams to filter numbers divisible by 2

• Use the filter() method with a lambda expression to check for divisibility by 2

• Collect the filtered numbers into a list or array
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Q3. Synchronized block and method, use of lock in method
Ans. 
Synchronized block and method are used in Java to control access to shared resources using locks.
• Synchronized block allows locking on a specific object instance or class

• Synchronized method locks on the object instance

• Locks prevent multiple threads from accessing the synchronized code simultaneously
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Q4. Rest api validation
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Good and bad if social media

Q1. Self introduction
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Q2. Some technical basics questions
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Q1. Basics on Java 8, MySql, Linux
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Q1. Java 8 features
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Q2. @transactional
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Q1. Sql questions based on queries and scenarios
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Q2. Microservices architecture
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Q3. Design patterns
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Q1. Data structures
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Q2. Solid Principles
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Q3. Single responsibility principle
Ans. 
Single responsibility principle states that a class should have only one reason to change.
• Each class should have only one responsibility

• Helps in making code more maintainable and easier to understand

• Promotes separation of concerns

• Example: A class that handles user authentication should not also handle file management
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Q4. Javascript question
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Q5. Object oriented concepts
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It was an easy test. It consisted of MCQs and two coding qns. Prepare SQL well. It also had 2 programming question. Both were medium difficukty

Q1. It was mainly focussed on my projects. Be thorough with you resume. But it also depends on the interviewer.
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Apt + coding questions, medium difficulty

Q1. Basics qs on oops and known programming language
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Q1. In-depth of oops and live coding questions
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Q1. Basics qs like y and what
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Q1. Valid parentheses
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Q2. Currying with arrow function
Ans. 
Currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.
• Currying can be achieved using arrow functions in JavaScript.

• Arrow functions automatically bind 'this' and do not have their own 'this' value.

• Example: const add = a => b => a + b;

• Example: const addFive = add(5); const result = addFive(3); // result
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Q1. DFS related problem
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Q2. Machine coding round
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Q1. Concepts of OOPS
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