CitiusTech Technical Lead Interview Questions, Process, and Tips

Q1. What are the Features of Java 8, and where you are using it in your current project?
Ans. 
Java 8 features include lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with collections of objects in a functional style.

• Default methods allow interfaces to have method implementations.

• Examples: Using lambda expressions to iterate...read more
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Q2. Map vs flat map, Function vs Predicate
Ans. 
Map applies a function to each element in a collection, while flatMap applies a function that returns a collection and flattens the result. Function is used to transform input into output, Predicate is used to test a condition.
• Map transforms each element in a collection using a function

• FlatMap transforms each element in a collection using a function that returns a collection and flattens the result

• Function is used to t...read more
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Q3. Find the sum of even numbers from a list using stream API
Ans. 
Use stream API to find sum of even numbers from a list
• Use filter to get only even numbers

• Use mapToInt to convert stream to IntStream

• Use sum() to get the sum of even numbers
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Q1. Design Principles and Explanation of Liskov's substitution principle.
Ans. 
Liskov's substitution principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.
• Subtypes must be substitutable for their base types

• Derived classes should be able to extend the functionality of base classes without changing their behavior

• Violating this principle can lead to unexpected behavior and errors in the program
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Q2. A case when switch-case will break any design principal.
Ans. 
Switch-case can break the Open/Closed Principle by requiring modification of existing code for new cases.
• Switch-case statements violate the Open/Closed Principle, which states that classes should be open for extension but closed for modification.

• Adding a new case to a switch statement requires modifying the existing code, violating the principle of not modifying existing code.

• Instead of using switch-case, consider usin...read more
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Q3. Different kinds of DB joins.
Ans. 
Different kinds of DB joins include inner join, outer join, left join, and right join.
• Inner join: Returns rows when there is at least one match in both tables.

• Outer join: Returns all rows when there is a match in one of the tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.
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Q1. Oops questions microservices design patterns
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Q1. All based on your skill set
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Problem solving in real time.

Q1. All is based on technical skills like as how to handle the project in different stages, team leader as a role etc.
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Q1. Joins, sql queries, unix commands
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Q1. Project description, pl sql concepts
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Q1. Basics of related technology and coding questions related to basic operations of array string
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Q1. Tech 2 round is more about concept
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Q1. Manager round not technical
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Q1. Formal discussion ,salary negotiation
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Q1. Core java basic questions, SPring , Rest service, Hashap working, contract of hashmap and equals
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Q1. Why do you want to join Citiustech
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