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Zeel Infotech Java Developer Interview Questions, Process, and Tips
Zeel Infotech Java Developer Interview Experiences
1 interview found
Anonymous
Selected
I applied via Walk-in and was interviewed before Mar 2023. There were 3 interview rounds.
Round 1 is aptitude test mostly 30 questions they give questions are based on patterns like what will be the next pattern
(5 Questions)
- Q1. What is abstraction?
- Ans.
Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the outside world.
Abstraction allows developers to focus on what an object does rather than how it does it
It helps in reducing complexity and improving maintainability of code
Example: In Java, abstract classes and interfaces are used to achieve abstraction
- Q2. Difference between delete and truncate?
- Ans.
Delete removes rows one by one, while truncate removes all rows at once.
Delete is a DML command, while truncate is a DDL command.
Delete operation can be rolled back, while truncate operation cannot be rolled back.
Delete operation fires triggers, while truncate operation does not fire triggers.
Delete operation is slower as it removes rows one by one, while truncate operation is faster as it removes all rows at once.
- Q3. What do you mean by primary key?
- Ans.
Primary key is a unique identifier for each record in a database table.
Primary key ensures each record in a table is unique
It can be a single column or a combination of columns
Primary key constraints prevent duplicate or null values
- Q4. What is inheritance ?
- Ans.
Inheritance is a mechanism in Java where a new class inherits properties and behaviors from an existing class.
Allows for code reusability
Establishes a parent-child relationship between classes
Derived class can access methods and fields of the base class
Can create a hierarchy of classes
- Q5. What is hashmap
- Ans.
HashMap is a data structure in Java that stores key-value pairs and allows fast retrieval of values based on keys.
HashMap implements the Map interface in Java
It allows one null key and multiple null values
Keys in a HashMap must be unique
Example: HashMap
To swap two numbers in an array
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Interview questions from similar companies
(2 Questions)
- Q1. Difference between Hashset and Treeset
- Q2. Final Finally and finalize difference
syed gajini ahmed
I applied via LinkedIn and was interviewed in Oct 2024. There was 1 interview round.
(3 Questions)
- Q1. Spring Security Implementation
- Q2. Api design Implementation
- Ans.
API design implementation involves creating a well-structured and user-friendly interface for interacting with software applications.
Understand the requirements and use cases for the API
Design clear and consistent endpoints with proper documentation
Implement secure authentication and authorization mechanisms
Follow RESTful principles for creating APIs
Consider scalability and performance optimizations
- Q3. Stream API coding question
(2 Questions)
- Q1. Basics of java like string ,string builder ,Buffer,scp
- Q2. Spring boot annotaions
(2 Questions)
- Q1. Explain how hashmap internally works
- Ans.
HashMap internally uses an array of linked lists to store key-value pairs.
HashMap uses hashing to determine the index of the key in the array.
If multiple keys hash to the same index, a linked list is used to store them.
When retrieving a value, the key is hashed to find the index and then the linked list is searched for the key.
- Q2. Difference between vector and Arraylist
- Ans.
Vector is synchronized and slower, ArrayList is unsynchronized and faster.
Vector is synchronized, ArrayList is not.
Vector is slower due to synchronization, ArrayList is faster.
Vector is legacy class, ArrayList is part of Java Collections framework.
Vector doubles its size when full, ArrayList increases by 50%.
Skills evaluated in this interview
I applied via Company Website
Very difficult aptitude questions
Resources coding round
(2 Questions)
- Q1. Very difficult questions
- Q2. Coding program is very difficult
Selected
I applied via Naukri.com and was interviewed in Apr 2024. There was 1 interview round.
Java progaming, coding
3 coding questions were given and to be solved only in java
munigala rahul
(1 Question)
- Q1. Oops, polymorphism
Find the 2nd highest number
I applied via Job Fair and was interviewed in Nov 2022. There were 3 interview rounds.
Reasoning topics,Java logica programming
(3 Questions)
- Q1. Oops concepts java Database in SQL
- Q2. Introduction your self
- Ans.
I am a Java Developer with 5 years of experience in developing web applications.
I have a strong understanding of Java programming language and its frameworks like Spring and Hibernate.
I have experience in developing RESTful APIs and working with databases like MySQL and Oracle.
I am familiar with front-end technologies like HTML, CSS, and JavaScript.
I have worked on projects that involved integrating third-party APIs an...
- Q3. Oops concepts java College academy project
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Zeel Infotech Java Developer Interview Process
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