Interview Questions Archives

Understanding the Difference Between HashSet and TreeSet in Java

When working with Java collections, two commonly used implementations of the Set interface are HashSet and TreeSet. Both are used to store unique elements, but they have significant differences in terms of internal implementation, performance,…

Jewel Chowdhury March 2, 2025

INTERVIEW Interview Questions

Understanding the Difference Between HashMap and HashTable in Java

When working with Java collections, two commonly used data structures for storing key-value pairs are HashMap and HashTable. While both are used for similar purposes, they have significant differences in terms of functionality,…

Jewel Chowdhury March 1, 2025

INTERVIEW Interview Questions Java Advanced

Understanding the Difference Between Heap and Stack Memory in Java

When it comes to memory management in Java, two key concepts often come up: Heap Memory and Stack Memory. Both are essential for the execution of Java programs, but they serve different purposes…

Jewel Chowdhury March 1, 2025

INTERVIEW Interview Questions Java

HashMap vs. TreeMap in Java: A Comprehensive Comparison

In Java, HashMap and TreeMap are two commonly used implementations of the Map interface, each serving distinct purposes and use cases. Understanding their differences is crucial for making the right…

Jewel Chowdhury September 1, 2024

Interview Questions INTERVIEW Java

Java Serialization: Can Static Values Be Serialized?

In Java, static values cannot be serialized directly. Serialization is the process of converting an object into a byte stream to store it in a file or send it over…

Jewel Chowdhury June 7, 2023

Interview Questions Testing

Demystifying the AAA Pattern: A Comprehensive Guide to Software Testing

The AAA pattern is a common way of structuring software test cases. It consists of three parts: Arrange: Set up the objects and data needed for the test. Act: Perform…

Jewel Chowdhury May 11, 2023

Interview Questions Docker

Discovering the IP Address or Hostname of a Docker Container: A Step-by-Step Guide

To find the IP address or hostname of your Docker container, you can use the following steps: Use the docker ps command to list the running Docker containers on your…

Jewel Chowdhury May 11, 2023

Interview Questions

SOAP vs REST API: Exploring the Fundamentals and Key Distinctions

SOAP API: A SOAP API (Application Programming Interface) is a web-based API that uses the SOAP (Simple Object Access Protocol) protocol to exchange structured information between software applications. SOAP API…

Jewel Chowdhury May 11, 2023

Spring Boot Interview Questions

Understanding Bean Loading Strategies in Spring Boot: A Complete Overview

In Spring Boot, there are two types of bean loading strategies: lazy loading and eager loading. Lazy loading means that the bean is only created when it is first requested.…

Jewel Chowdhury May 9, 2023

Spring Boot Interview Questions

IoC Explained with Examples in Spring Boot: Understanding Inversion of Control

Inversion of Control (IoC) is a design pattern that is widely used in Spring Boot applications. The basic idea behind IoC is to invert the control of the flow of…

Jewel Chowdhury May 8, 2023

Interview Questions Java Java Basic

Convert array to ArrayList java

In this article, we are converting an array to ArrayList in Java. We will discuss three different ways to do that. So, I will show how to convert an Array…

Jewel Chowdhury July 7, 2021

Interview Questions Java Java Advanced

Java pass by reference

Is java pass by reference? The answer is NO. Java is always pass-by-value. Today we will learn java pass by reference and java pass by value with examples. Let’s create Person class: package com.example; public…

Jewel Chowdhury July 6, 2021

Interview Questions

What is the difference between public, protected and private in Java?

Public, Private and Protected are called access modifier in java. This are the reserved keyword in java. They are defined the access of the classes and interfaces. And when one…

Jewel Chowdhury June 21, 2021

Interview Questions

What are the differences between HashMap and Hashtable in Java?

Hashtables and HashMaps are both used to store data in key-value pairs. To store unique keys, both use the hashing approach. However, there are numerous distinctions between the HashMap and…

Jewel Chowdhury June 21, 2021

Interview Questions

Define class loader and its type in java

Java class loader is mainly responsible for loading java classes during runtime dynamically to the Java Virtual Machine(JVM). Classloader is a subset of JVM, responsible for loading the class files.…

Jewel Chowdhury June 18, 2021

Interview Questions

Differences between Exception and Error in java

java.lang.Error and java.lang.Exception both are subclass of java.lang.Throwable class. You can not recover error but you can recover exception by using try-catch block. Errors are mostly caused by the environment…

Jewel Chowdhury June 18, 2021