BlackRock Java Interview Questions

Upasana | November 21, 2020 | 1 min read | 1,286 views | algorithm-datastructures

Core Java & multi-threading questions

What is Immutability? How will you make a class Immutable in Java?
How will you design a immutable class that holds mutable member variables in it?
How will you achieve thread-safety in your Java Program?
What are the ways to increase throughput of a multi-threaded java program? (concurrency enhancements - use java.util.concurrent package, connection pooling, other resource pooling, caching, GC tuning, etc.)

There is a pricing service which connects to Reuters & Bloomberg and fetches the latest price for the given Instrument Tics. There could be multiple price events for the same Stock and we need to consider the latest one. Design a service to show prices for the Top 10 stocks of the Day? Solution is discussed in my eBook
There is a very Big file containing many words, how will you read and process it to print the below information?
- Top 10 ranked distinct words.
- Occurrence of each Alphabet in the file.
How will you implement a Stack using a Queue?
How will you implement a Queue using a Stack?
How will you design a two way Elevator Software for a building?
How will you find a single duplicate number from a large array in minimum time?