ForeScout Interview Experience For Java Developer

1. Tell me about your IT experience and projects you worked on.
2. What is Lambda in AWS? What does it mean by serverless? Is it can run complex queries? What is SQS in AWS? What is the difference b/w a normal queue and a fifo in SQS? What is SNS and its uses in AWS? When to use which dB in AWS?
3. Given a list of employees with their age give a list of names when age is greater than a specific number using Stream API in java.
4. Give the Internal working of HashMap and HashSet. Why HashSet don’t allow duplicate characters?
5. How does HashMap control collisions internally?
6. How to create custom exceptions in Java? Can a child class exception be different from the parent class exception?
7. What is a checked Exception in Java?
8. Given String s=”Leetcode”, find the first non-repeating character from this.
9. If there is one class X and class Y and Z implement it in spring. How to connect two X to Y and X to Z and how to remove ambiguity of the references.
10. What is the scope of spring bean?
11. How to create indexing of tables in JPA?
12. How to create a composite key in JPA?
13. How to create a foreign key in JPA if there are two tables given?
14. What are Generics in Java? Why are they required in Java?
15. Java8 new features? Why functional Interfaces was introduced?
16. Can we remove Tomcat server from starter-web and add another server?