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1,051 full stack java developer interview questions shared by candidates

01. Collection? 02. What Collections do you know? 03. What is HashMap? 04. HashMap implementation? 05. What is Synchronization? 06. Tell me how synchronization works? 07. Scenario based question on declaring a candidate as winner in an election? Used List and Comparator to solve it? 08. How you maintain Spring application in multiple environment lik QA, Dev/producton etc 09. Bean Scopes? 10. Difference between Singleton and Prototype Scope? 11. What is DI? 12. What is the responsibility of IOC Container in Spring? 13. What is DispatcherServlet? 14. Inject Address into an Employee class? 15. How do you inject one service to another service? 16. How will you validate empName property which is passed in the body of the request in Employee object? 17. Can you explain how the request coming to your defined function addEmployee() in the above code snippet? 18. What is Router in Angular? 19. What is Form validation? 20. Async validation in Form? Validate whether the entered User name is available or not? 21. How do you write test cases in Angular?
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Java Full Stack Developer

Interviewed at Persistent Systems

4.2★
May 5, 2021

01. Collection? 02. What Collections do you know? 03. What is HashMap? 04. HashMap implementation? 05. What is Synchronization? 06. Tell me how synchronization works? 07. Scenario based question on declaring a candidate as winner in an election? Used List and Comparator to solve it? 08. How you maintain Spring application in multiple environment lik QA, Dev/producton etc 09. Bean Scopes? 10. Difference between Singleton and Prototype Scope? 11. What is DI? 12. What is the responsibility of IOC Container in Spring? 13. What is DispatcherServlet? 14. Inject Address into an Employee class? 15. How do you inject one service to another service? 16. How will you validate empName property which is passed in the body of the request in Employee object? 17. Can you explain how the request coming to your defined function addEmployee() in the above code snippet? 18. What is Router in Angular? 19. What is Form validation? 20. Async validation in Form? Validate whether the entered User name is available or not? 21. How do you write test cases in Angular?

stream api ->diference flatMap and map in stream explain try with resources Busy spinning Builder pattern Concurrent utilities different types class loaders Tree map -> how to add employee object other than put method How will treemap sort emplyee object
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Full Stack Java Developer

Interviewed at Synechron

4.1★
Jun 8, 2021

stream api ->diference flatMap and map in stream explain try with resources Busy spinning Builder pattern Concurrent utilities different types class loaders Tree map -> how to add employee object other than put method How will treemap sort emplyee object

React & JS 1. Given 1 URL that data need to render in table format, while coding ask few question what is hook, useState, useEffect, debug the code analysis the styling and change it. 2. Closure, Hoisting in js 3. Let say you are CEO if huge E-commerce application as a CEO what kind of this you want to see when you have only 10 minutes to see. 4. LinkedList, Stack, Queue Java 1. HashMap working internal, Linked HashMap vs HashMap. 2. Design LLD for Parking Lot 3. Advantage of Spring Bean over manual creation of bean. 4. Give some situation and ask what kind of Data structure you use.
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Full Stack Engineer - Java and React JS

Interviewed at Apple

4.1★
Jun 7, 2025

React & JS 1. Given 1 URL that data need to render in table format, while coding ask few question what is hook, useState, useEffect, debug the code analysis the styling and change it. 2. Closure, Hoisting in js 3. Let say you are CEO if huge E-commerce application as a CEO what kind of this you want to see when you have only 10 minutes to see. 4. LinkedList, Stack, Queue Java 1. HashMap working internal, Linked HashMap vs HashMap. 2. Design LLD for Parking Lot 3. Advantage of Spring Bean over manual creation of bean. 4. Give some situation and ask what kind of Data structure you use.

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