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

Most of the questions were based on core Java concepts i.e Inheritance, Abstraction, Encapsulation and Polymorphism. One or two questions were on DSA. Those questions were based on simple array manipulation and tree. In the question on tree, the interviewer added new points and I had to change the code according to that. But, all the interviewers were helpful. One or two questions were also on my projects.
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Full Stack Engineer (Java)

Interviewed at Whatfix

3.3★
Jan 2, 2019

Most of the questions were based on core Java concepts i.e Inheritance, Abstraction, Encapsulation and Polymorphism. One or two questions were on DSA. Those questions were based on simple array manipulation and tree. In the question on tree, the interviewer added new points and I had to change the code according to that. But, all the interviewers were helpful. One or two questions were also on my projects.

L1-Technical Round: Static method can be override? Static method can be overloaded? ECMA means? Which is latest ECMA version being used and new features introduce? Arraylist v/s Hashset, Which will perform fast and provide time complexity? contain() v/s compareTo() methods in collections? How hashset works internally, what have changed in java-8? Exception handling in java project Various types of Directives in angular Expressions in angular What all way you communicate with other components, give your opinion on same? AOT in angular? Multithreading handson, if any? Testing frameworks have you used any & which one use for angular? Scenario: you have dropdown list based on some condition want to populate grid data, How will you design end to end? Coding question: Find duplicate elements in array, How to remove same?
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Java Full Stack Developer

Interviewed at Capco

3.8★
Jan 28, 2021

L1-Technical Round: Static method can be override? Static method can be overloaded? ECMA means? Which is latest ECMA version being used and new features introduce? Arraylist v/s Hashset, Which will perform fast and provide time complexity? contain() v/s compareTo() methods in collections? How hashset works internally, what have changed in java-8? Exception handling in java project Various types of Directives in angular Expressions in angular What all way you communicate with other components, give your opinion on same? AOT in angular? Multithreading handson, if any? Testing frameworks have you used any & which one use for angular? Scenario: you have dropdown list based on some condition want to populate grid data, How will you design end to end? Coding question: Find duplicate elements in array, How to remove same?

Consisted 4 rounds 1st round on paper consisted mcqs and theory question and a coding question 2nd round 3 Sql queries 3 rd round face to face interview regarding concepts of java, oops 4 th round on Springboot task based and theoretical questioning of each command
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Full Stack Java Developer

Interviewed at Inspiron Labs

3.6★
Nov 15, 2025

Consisted 4 rounds 1st round on paper consisted mcqs and theory question and a coding question 2nd round 3 Sql queries 3 rd round face to face interview regarding concepts of java, oops 4 th round on Springboot task based and theoretical questioning of each command

Java Side: 1. Difference between RequestMapping and other Mappings? 2. Java 8 features 3. One small technical problem (String manipulation) 4. Qualifier annotation 5. Why notify, notifyAll, wait are outside functions in thread. etc React Side: 1. Lifecycle 2. Hooks 3. Keys 4. Mapping 5. Controlled and uncontrolled components etc The interview was like this. Only they are asking what's in the book.
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Java Full Stack Developer

Interviewed at Tech Mahindra

3.4★
Oct 2, 2025

Java Side: 1. Difference between RequestMapping and other Mappings? 2. Java 8 features 3. One small technical problem (String manipulation) 4. Qualifier annotation 5. Why notify, notifyAll, wait are outside functions in thread. etc React Side: 1. Lifecycle 2. Hooks 3. Keys 4. Mapping 5. Controlled and uncontrolled components etc The interview was like this. Only they are asking what's in the book.

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