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Java Math.abs() and Math.absExact() with Examples

This Java tutorial explores what are absolute values, the overflow, and underflow problems of Math.abs() method, and how Java 15 Math.absExact() solves them.

Java String Concatenation: The Best Way? (+Examples)

This article delves into the differences between these ways and highlights how Java optimizes the bytecode to make the String concatenation faster.

Checking if Two Strings are Isomorphic

Two string literals are considered isomorphic if we can map every character of the first string to every character of the second string in a one-to-one fashion.

Java Text Block Formatting with Variables/Expressions

Learn to apply String interpolation style formatting of Java text blocks by variable (or expression) substitutions. Also see why to avoid concatenation.

Java Multiline String (with Examples)

Writing a multiline string can be approached differently depending on the version of Java you are using. Since Java 15, text blocks are the preferred method.

Create Online Python Editor using Flask, Docker and K8s

Learn to build an online Python editor (using Flask, Docker, and Kubernetes) that allows users to write and run Python code directly from the browser.

Building a Recommendation System in Python

Learn the significance of recommendation systems, recommendation algorithms, and a demo of a movie recommender system example in Python.

Python List Comprehension Example: If-else, Two Lists

Learn Python list comprehension, and its syntax and example, using if-else style conditions and writing nested list comprehensions involving two lists.

Fine-Tune an OpenAI ChatGPT Model: Step-by-Step Example

In this chatGPT tutorial, explore the entire life cycle of fine-tuning models from preparing training data, creating a fine-tuned model, and using it programmatically.

Getting Started with ChatGPT API and Python

Learn the basics of ChatGPT, the ChatGPT API for Python, and how to use it for creating and performing NLP tasks with examples.

Spring 6 Programmatic Validator: A Comprehensive Guide

Spring 6 Programmatic Validator API allows to add fine-grained validation rules beyond the capabilities of annotations-based declarative approach.

Spring 6 JdbcClient: When and How to Use it?

Since Spring 6.1, JdbcClient provides a unified client API for JDBC query and update operations, offering a more fluent and simplified interaction model.

Big O Notation: Measuring the Algorithm Efficiency

Big O notation categorizes the efficiency of a given algorithm and describes the upper bound of the growth rate of a function as the input grows.

Elasticsearch with Spring Data and Spring Boot 3

This Spring Boot tutorial explores the basics of Elasticsearch such as creating index, CRUD operations, searching, and querying the documents with examples.

Capture and Analyze a Thread Dump in Java

Learn to capture and analyze thread dumps in Java either manually to using tools such as JStack, VisualVM, FastThread, TDA and JProfiler, etc.

Hibernate Soft Delete: @SoftDelete Example

Since version 6.4, Hibernate @SoftDelete annotation provides first-class support for soft delete feature and transparently manages the indicator column name and values.

Spring WebClient Retry and RetryWhen (with Examples)

Learn to retry the failed requests with Spring WebClient’s retry() and retryWhen() operators including retry on specific exception cases.

Running JUnit Tests with Gradle

By utilizing the –tests option, we can run unit tests using Gradle from entire test suites to specific test classes or methods.

JUnit 5: Non-Static @BeforeAll and @AfterAll Methods

Learn to write non-static @BeforeAll and @AfterAll methods with @TestInstance(TestInstance.Lifecycle.PER_CLASS) to access test instance-specific variables.

Spring Bean Naming: Default, Explicit and Custom Strategies

In Spring, the default naming strategy utilizes the named of annotated classes or methods. Learn to customize it by explicit or custom naming with examples.

SpringExtension for JUnit 5: Why Do We Need It?

SpringExtension integrates the Spring TestContext Framework into JUnit 5 Jupiter extension model, sets up the ApplicationContext, and manages dependencies.

[Solved] Maven-compiler-plugin: release version 21 not supported

Learn the root cause and the solution behind the error “Maven-compiler-plugin: release version not supported” while upgrading a Java project.

Spring Boot Transaction-Aware Caching Example

In Spring tutorial explores transaction-aware caching using transactionAware property and TransactionAwareCacheManagerProxy class with example.

Create and Extract Jar File on Linux, MacOS and Windows

This Java cheat sheet discussed the JDK jar utility for creating and extracting the JAR files. It mimics the Unix tape archive command, tar.

Installing OpenJDK on Linux, macOS and Windows

Learn to install OpenJDK Correto distributed by Amazon on different operating systems such as Linux, macOS, and Windows.

List and Filter Docker Containers: A Cheat Sheet

Learn to list Docker containers, customizing the output format and filtering containers based on their running/stopped status and names, etc.

Java Align Text in Columns: Print in Tabular Format

Using the TextTable class or String.format() methods, we can easily align the text in columns and print them in the console or any output file.

Run a Spring Boot and Postgres Application on Podman

This guide explores the step-by-step process of containerization and running a Spring Boot application with PostgreSQL database using Podman.

Spring Boot REST API Timeout (with Examples)

Learn to handle REST API timeouts on the server side using Spring boot MVC async, Resilience4j, @Transactional, RestTemplate and WebClient with examples.

Convert JSON Array to List: Gson, Jackson and Org.json

Learn to use Gson, Jackson, and Org.json libraries to convert a JSON array into an ArrayList of objects with easy-to-understand examples.

Java 21 Unnamed Patterns and Variables (with Examples)

Unnamed patterns and variables represent the record components and local variables as an underscore (_) to denote that we’re not interested in them.

Java 21 Scoped Values: A Deep Dive with Examples

In Java 21, Scoped values are implicit method parameters and help in sharing data with virtual threads that can be created in millions.

AWS SQS with Spring Cloud AWS and Spring Boot 3

Learn to configure AWS SQS in Spring Cloud AWS application, create and configure Queues, produce and consume messages and acknowledgements.

Kafka with Schema Registry and Avro Serialization

Learn to integrate Kafka with Apache Avro and Schema Registry to manage the changes in Schema over time, and a demo to test this integration.

Git Interview Questions for DevOps and Testers

Top 30+ Git interview questions and answers providing a thorough exploration of essential concepts and practices within the Git version control system.

Java Math.ceil() vs. Math.floor() vs. Math.round()

In this Java tutorial, we’ll explore the Math.round(), Math.ceil() and Math.floor() methods in detail, understand their differences and discover their use cases.

Spring vs. Spring Boot: What’s Difference?

This Spring vs. Spring Boot tutorial lists the differences between Spring framework and Spring Boot based on general characteristics and features.

Spring Boot OpenFeign Client Tutorial

Learn about Feign Client and how to use it in a Spring Boot application. Also, learn the commonly used default Feign configurations and customizing them.

Java Enumeration, Iterator, ListIterator and Spliterator

In Java, all types of enumerations and iterators (such as Iterator, ListIterator, SplitIterator) are simply navigational cursors and the main purpose of these cursors is to iterate over the elements of the collection. Each cursor has its own features, advantages and disadvantages. In this article, we will walk through these …

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