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Overview

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.

Key Features

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

İstifadə halları

• 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

Installation Guide

**Ubuntu Installation:**
```bash
# 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:**
```java
// HelloWorld.java
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
```

```bash
javac HelloWorld.java
java HelloWorld
```

Configuration Tips

**Spring Boot Project:**
```java
@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:**
```xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>3.2.0</version>
</dependency>
</dependencies>
```

```bash
mvn spring-boot:run
```

Java (OpenJDK)

Deployment Info

Overview

Key Features

İstifadə halları

Installation Guide

Configuration Tips

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Java (OpenJDK)

Deployment Info

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Overview

Key Features

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Installation Guide

Configuration Tips

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