Software Engineer Java Developer Interview Questions

4,205 software engineer java developer interview questions shared by candidates

3rd Interview, onsite : -code a class that represent a rectangle -given a point, determine if its inside that rectangle -draw a binary tree of 3 levels -Code a class to represent a binary tree -write a function to count number of nodes in a binary tree -how does insertion and retrieval work in a BST ? whats the running time -define Big(O) notation -write a class to represent a linked list -how to discover if there's a loop in the linked list ? -given a phrase, reverse words i.e: "I want to eat" becomes "eat to want I" -given a phrase, find first non repeating character -whats agile -some behavioral questions
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Junior Java Software Engineer

Interviewed at Loc8.com

4.6
Feb 2, 2015

3rd Interview, onsite : -code a class that represent a rectangle -given a point, determine if its inside that rectangle -draw a binary tree of 3 levels -Code a class to represent a binary tree -write a function to count number of nodes in a binary tree -how does insertion and retrieval work in a BST ? whats the running time -define Big(O) notation -write a class to represent a linked list -how to discover if there's a loop in the linked list ? -given a phrase, reverse words i.e: "I want to eat" becomes "eat to want I" -given a phrase, find first non repeating character -whats agile -some behavioral questions

Round 1:- Aptitude Questions Programs: 1. Adding 2 numbers using Recursion. 2. Finding duplicates in an Array. 3. Frequency of Array Elements. Round 2:- In technical Round they asked about OOPS Concept. They asked what is Palindrome. They told to write a program on either string palindrome or number palindrome. They then asked a puzzle. if 3 bulbs are in different room and switches in different room, How to identify which button is for which bulb. Round 3: HR asked about some technical as well as HR Questions.
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Java Software Developer

Interviewed at Concerto Software

3.7
Apr 15, 2021

Round 1:- Aptitude Questions Programs: 1. Adding 2 numbers using Recursion. 2. Finding duplicates in an Array. 3. Frequency of Array Elements. Round 2:- In technical Round they asked about OOPS Concept. They asked what is Palindrome. They told to write a program on either string palindrome or number palindrome. They then asked a puzzle. if 3 bulbs are in different room and switches in different room, How to identify which button is for which bulb. Round 3: HR asked about some technical as well as HR Questions.

In First Round :- It is assessment test 2 coding questions and some basic Java Questions. In Second Round :- coding and some basic java questions. In Third Round :- some basic java questions which is take by client. In Fourth Round :- it is HR discussion.
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Software Engineer - Java Developer

Interviewed at NextGen Healthcare

3.1
Feb 29, 2024

In First Round :- It is assessment test 2 coding questions and some basic Java Questions. In Second Round :- coding and some basic java questions. In Third Round :- some basic java questions which is take by client. In Fourth Round :- it is HR discussion.

1) What is the heap? 2) How hashmap is designed? 3) Mechanisms of thread-safety 4) Indexes 5) SOLID principles 6) How I would test the app from round 2 and which layers are critical to test? 7) How I would implement a specific feature - related to caching, scheduled calculations, etc. 8) How I implemented exceptions handling? 9) How I would design a database with a lot of data persisting/querying in the database? 10) ...
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Java Software Engineer

Interviewed at Seven Bridges

4.1
Aug 15, 2021

1) What is the heap? 2) How hashmap is designed? 3) Mechanisms of thread-safety 4) Indexes 5) SOLID principles 6) How I would test the app from round 2 and which layers are critical to test? 7) How I would implement a specific feature - related to caching, scheduled calculations, etc. 8) How I implemented exceptions handling? 9) How I would design a database with a lot of data persisting/querying in the database? 10) ...

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