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Java (OpenJDK)

Langages de programmation

Langage de programmation et environnement d'exécution de niveau entreprise pour la création d'applications multiplateformes

Informations sur le déploiement

Déploiement: 2-5 min
catégorie: Langages de programmation
RAM minimale: 512MB
Soutien: Billets et courriels

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Aperçu général

Java (OpenJDK) is one of the world's most popular programming languages, known for its 'write once, run anywhere' philosophy. Java is platform-independent, object-oriented, and battle-tested in enterprise environments for decades. With the Java Virtual Machine (JVM), code compiled to bytecode runs on any platform without modification. Java powers everything from Android apps to enterprise backend systems, big data processing (Hadoop, Spark), and web applications (Spring Boot). OpenJDK is the free, open-source implementation of the Java Platform, providing the same features as Oracle JDK with a GPL license.

Principales caractéristiques

Platform Independence

Write once, run anywhere via JVM bytecode

Enterprise Ready

Robust, scalable, with comprehensive libraries and frameworks

Strong Typing

Compile-time type safety prevents common errors

Automatic Memory Management

Garbage collection handles memory automatically

Rich Ecosystem

Spring, Hibernate, Maven, Gradle, and thousands of libraries

Backward Compatible

Code written decades ago still runs on modern JVMs

Cas d'utilisation

• Enterprise backend applications and APIs
• Android mobile app development
• Big data processing (Hadoop, Spark, Kafka)
• Web applications with Spring Boot
• Microservices architecture
• Financial systems and trading platforms
• Cloud-native applications

Guide d'installation

Ubuntu Installation:
# OpenJDK 17 (LTS)
sudo apt update
sudo apt install openjdk-17-jdk -y
java -version

# Set JAVA_HOME
echo 'export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64' >> ~/.bashrc
source ~/.bashrc
Hello World:
// HelloWorld.java
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}
javac HelloWorld.java
java HelloWorld

Conseils de configuration

Spring Boot Project:
@SpringBootApplication
@RestController
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
    
    @GetMapping("/")
    public String hello() {
        return "Hello, World!";
    }
}
Maven pom.xml:
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>3.2.0</version>
    </dependency>
</dependencies>
mvn spring-boot:run

Prescriptions techniques

Exigences du système

  • Mémoire: 512MB RAM

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