Cognizant Java Developer Interview Questions, Process, and Tips

Q1. Prime number program
Ans. 
A program to check if a given number is prime or not.
• Create a function to check if a number is prime by iterating from 2 to the square root of the number.

• If the number is divisible by any number other than 1 and itself, it is not prime.

• Handle edge cases like 0, 1, and negative numbers separately.
Answered by AI
Add your answer
Q2. 3rd highest salary employee
Ans. 
To find the 3rd highest salary employee, we can use a SQL query with the 'LIMIT' and 'OFFSET' keywords.
• Use a SQL query to select distinct salaries in descending order

• Use 'LIMIT 1 OFFSET 2' to get the 3rd highest salary

• Join this result with the employee table to get the employee details
Answered by AI
Add your answer

1 round in fresher Java coding test

Second Java aptitude test

Q1. What JDK,JRE,JVM
Add your answer
Q2. What is inheritance
Add your answer

Q1. What is Static Method?
Ans. 
Static method is a method that belongs to the class itself, not to any specific instance of the class.
• Static methods can be called without creating an instance of the class.

• They are commonly used for utility methods that do not require access to instance variables.

• Static methods are declared using the 'static' keyword.

• Example: Math.max() is a static method in the Math class that returns the maximum of two numbers.
Answered by AI
Add your answer
Q2. LAMDA EXPRESSION?
Add your answer

Q1. How to make class immutable?
Ans. 
To make a class immutable in Java, you can follow certain guidelines to ensure that its state cannot be changed once it is created.
• Make the class final so that it cannot be extended.

• Make all fields private and final to prevent modification.

• Do not provide setter methods for the fields.

• If the fields are mutable objects, return copies of them instead of the original objects in getter methods.
Answered by AI
View 1 more answer
Q2. What is idempotency? Solid ? Design patterns used in projects
Ans. 
Idempotency is the property of an operation where multiple identical requests have the same effect as a single request.
• Idempotency ensures that even if the same request is made multiple times, the result will be the same.

• In RESTful APIs, using HTTP methods like GET and PUT can help achieve idempotency.

• Design patterns like Command Pattern and State Pattern can be used to ensure idempotency in projects.
Answered by AI
Add your answer

Q1. About java, spring and spring boot
Add your answer

Q1. Why your switching the organisation
Add your answer