Skip to main content

Java

Java is a powerful, object-oriented programming language known for its "write once, run anywhere" capability. It's widely used for enterprise applications, Android development, and large-scale systems.

What You'll Learn​

Comprehensive Java development from fundamentals to testing and build tools.

Fundamentals​

Master Java best practices and modern language features.

Topics covered:

  • Variable types and best practices
  • Interface vs concrete types
  • Primitives vs wrapper classes
  • Modern Java features (records, pattern matching, text blocks)

Testing​

Write reliable, maintainable tests for your Java applications.

Topics covered:

  • JUnit 5 (Jupiter) testing framework
  • Mocking with Mockito
  • Test coverage with JaCoCo
  • Parameterized and nested tests

Build Tools​

Automate your Java build process with modern tools.

Topics covered:

  • Gradle build automation
  • Maven project management
  • Dependency management
  • Build optimization

Quick Start​

Installation​

# Install Java Development Kit (JDK)
# Download from: https://adoptium.net/ or https://www.oracle.com/java/

# Verify installation
java --version
javac --version

Your First Java Program​

// Hello.java
public class Hello {
    public static void main(String[] args) {
        System.out.println("Hello, Java!");
    }
}
# Compile
javac Hello.java

# Run
java Hello

Why Java?​

Strengths​

  • Platform Independent - Write once, run anywhere (JVM)
  • Strongly Typed - Catch errors at compile time
  • Robust - Strong memory management and exception handling
  • Mature Ecosystem - Vast libraries and frameworks
  • Enterprise Ready - Proven in large-scale applications
  • Backward Compatible - Old code runs on new JVMs
  • Great Tooling - IntelliJ IDEA, Eclipse, VS Code

Use Cases​

  • Enterprise applications (Spring Framework)
  • Android mobile development
  • Web applications (Jakarta EE, Spring Boot)
  • Big data processing (Hadoop, Spark)
  • Financial systems
  • Scientific applications

Learning Path​

  1. Start with Fundamentals - Learn Java best practices and modern features
  2. Learn Testing - Write tests with JUnit 5
  3. Master Build Tools - Automate with Gradle or Maven
  4. Explore Frameworks - Spring Boot, Jakarta EE, Micronaut

Start your Java journey today!