Fidelity Investments Senior Java Developer Interview Questions and Answers

There is coding test consists of Easy / Medium DSA Question on Array/String/Hashing

Q1. Java 8 Feature, Immutable, OOPS, Hashmap Internal, Exception Handling, Multthreading lots of Qs asked( Synchonization , Lock ), Collection Framework, Singleton DP.
Add your answer

Q1. Project Discussion, Spring Boot Microservice related FAQ, @Transactional, Qualifier, JPA related Question, Design APIs for a given Use Case & Apply Authentication & Authorization, SOLID Design Principles
Add your answer

Q1. Explain Latest Project Architechture, asked Cross Question why RDBMS database , why not NoSQL DB used, How OAuth works/ how API Security implemented in your project, Explain any recent Prod Issue you have ...read more
Add your answer

Q1. 1. Eager , Lazy Singleton Design Pattern. 2. Java 8 Stream , Functions (Predicate , Supplier , Consumer ) , Comparator Chaining 3. Designing Pattern -> Count Like / Seen any Post of Instagram , Reduce N/W...read more
Add your answer

Q1. Project questions
Add your answer
Q2. Spring related questions
Add your answer

Q1. Ask to write code for equal and hashcode in notepad
Add your answer
Q2. Type of Collections and its internal working
Ans. 
Java collections are data structures that store and manipulate groups of objects.
• Types of collections include List, Set, Map, Queue, etc.

• Internal workings involve data structures like arrays, linked lists, hash tables, etc.

• Collections framework provides interfaces and classes for working with collections.
Answered by AI
Add your answer
Q3. Count number of occurrence of string from Array
Ans. 
Count occurrences of a specific string in an array of strings.
• Iterate through the array and use a HashMap to store the count of each string.

• Use the string as key and increment the count each time it is encountered.

• Return the count of the specific string at the end.
Answered by AI
Add your answer
Q4. Write a code using stream
Ans. 
Using stream to filter a list of strings
• Use the filter method to apply a predicate to each element in the stream

• Convert the stream back to a list using the collect method
Answered by AI
Add your answer

Q1. Given problem and asked me to solve
Add your answer
Q2. Sum of array of elements without using any llop
Ans. 
Use reduce method to calculate sum of array elements without loop
• Use Array.reduce() method to sum up the array elements

• Convert array elements to numbers before summing them up

• Example: const arr = ['1', '2', '3']; const sum = arr.reduce((acc, curr) => acc + Number(curr), 0);
Answered by AI
Add your answer

Q1. 1. What is CRFT 2. Peek method in Java 8
Ans. 
CRFT is a framework for building full-stack web applications using React, Flask, and TypeScript.
• CRFT stands for React, Flask, and TypeScript, which are the technologies used in the framework

• It allows developers to build full-stack web applications with a modern tech stack

• CRFT provides a structured way to develop web applications by combining front-end and back-end technologies
Answered by AI
Add your answer