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System.out.println()

What Is System.Out.Println in Java? To define System.out.println() in Java, it is a simple statement that prints any argument you pass and adds a new line after it. *println() is responsible for printing the argument and printing a new line *Syste

Jan 07, 2025 pm 08:41 PM

What is hikari pool?

What is hikari pool? This simple question in a post on BlueSky led me to an explanation that I thought was really cool. I came here to finish it. In the specific context it was being talked about the Hikari Connection Pool. But if Hikari is a Connec

Jan 07, 2025 pm 04:08 PM

What You Need to Know About Java Packages

Java packages were created to help organize and manage large amounts of code. When software became more complex, developers needed a way to keep things organized. Packages group similar classes and interfaces together, making it easier to find and us

Jan 07, 2025 pm 02:08 PM

Lambda expressions in action

Some simple examples that put the basic concepts of lambda expressions into practice: Example 1 - Comparison of implementation without and with lambda Without using lambda: interface MyValueSemLambda1 { double getValue(); // Abstract method

Jan 07, 2025 am 08:12 AM

Functional interfaces

Functional Interface Definition Contains only one abstract method. It can have default and/or static methods. Abstract method does not specify implementation. interface MyValue { double getValue(); } Reminder: In functional interfaces, the modifier

Jan 07, 2025 am 08:10 AM

Fundamentals of lambda expressions

Syntax Elements Lambda Operator (->) Splits the lambda expression into two parts: Left side: Parameter list. Right side: Lambda body (actions or return). Lambda Body Types: Single expression: Directly returns the result

Jan 07, 2025 am 08:09 AM

Introduction to lambda expressions

Introduced in JDK 8. They increased the expressive power of the Java language. They added new syntax elements and optimized common structures. Comparison: Just as generics reshaped Java in the past, lambda expressions are reshaping h

Jan 07, 2025 am 08:08 AM

Spring Boot pplication on AWS Lambda - Part Measuring cold and warm starts with GraalVM Native Image and memory settings

Introduction In the article part 12 of our series we explored how to develop and deploy Lambda function with Custom Runtime containing GraalVM Native Image with GraalVM 22 runtime created from Spring Cloud Function AWS application. In the part

Jan 07, 2025 am 07:17 AM

Mastering Java Generics: A Comprehensive Guide with Code Examples

1. Understanding the Basics of Java Generics Java Generics allow you to define classes, interfaces, and methods with type parameters. This means you can write code that works with different data types while ensuring type safety at compile tim

Jan 07, 2025 am 06:27 AM

What are the key differences between an Interface and an Abstract class?

Interface vs Abstract Class Interface 100% abstraction (prior to Java 8). Can have default/static methods (Java 8 ). No constructors. Multiple inheritance allowed. Abstract Class Partial abstraction. Can have construct

Jan 07, 2025 am 06:19 AM

Java Can Be Serverless Too: Using GraalVM for Fast Cold Starts

Introduction A fairly common approach when it comes to working with serverless code is to write it as a Python, Node or Go application given their reputation for very fast cold starts. But what if we are faced with pre-existing Java apps tar

Jan 07, 2025 am 06:16 AM

Importing SSL certificate into cacerts, via KeyStore Explorer

1. Download and install KeyStore Explorer Access the official KeyStore Explorer website: https://keystore-explorer.org/; Download the latest version for your operating system; Install the program following the installer instructions. 2. Open the file

Jan 07, 2025 am 06:12 AM

Generate a REST API Using Java and Spring Boot for your Postgres database

This tutorial will show you how you can generate a Java API for your Postgres database using monstarillo. The API will use Spring Boot and Springdoc to document it. The API will perform CRUD operations on the tables you run it against. Unit tests wil

Jan 06, 2025 pm 10:21 PM

Understanding the XOR Operator: A Powerful Tool in Computing

The XOR operator, short for Exclusive OR, is a fundamental concept in computer science, mathematics, and digital logic. Represented by the symbol ^ in many programming languages and ⊕ in mathematical notation, XOR is a logical operation that is widel

Jan 06, 2025 pm 08:16 PM