Setting up environment variables like JAVA_HOME and NODEJS is a key step in configuring your development environment properly. Here's how you can do it for Windows, Linux, and macOS:

For Windows (10/11)

✅ Steps to Set JAVA_HOME and NODEJS:

1. Find the installation paths:

   • Java: Usually something like C:\Program Files\Java\jdk-XX

   • Node.js: Something like C:\Program Files\nodejs

2. Set Environment Variables:

   • Press Win + S, type Environment Variables, and open it.

   • Click Environment Variables…

   • Under System variables, click New:

     • Name: JAVA_HOME

     • Value: path to your JDK folder (e.g., C:\Program Files\Java\jdk-17)

   • Add another variable for Node.js if needed:

     • Name: NODEJS

     • Value: C:\Program Files\nodejs

     • Update the Path variable:

       • Select the Path variable under System variables → Click Edit.

       • Click New and add:

         • %JAVA_HOME%\bin

         • %NODEJS%

     • Apply and Restart Terminal:

       • Open a new Command Prompt or PowerShell window.

       • Check with:

         echo %JAVA_HOME%
         java -version
         node -v
         

For Linux/macOS (Bash or Zsh)

Open your shell profile:

• For Bash: nano ~/.bashrc or ~/.bash_profile

• For Zsh: nano ~/.zshrc

Add the following lines:

# Java
export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
export PATH=$JAVA_HOME/bin:$PATH

# Node.js
export NODEJS=/usr/local/bin/node
export PATH=$NODEJS:$PATH

? Adjust the paths according to where Java and Node.js are installed.

Then apply changes:

source ~/.bashrc  # or source ~/.zshrc

Verify:

echo $JAVA_HOME
java -version
node -v

Role of a Full Stack Java Developer

A Full Stack Java Developer works on both the frontend (client side) and backend (server side) of web applications, using Java-based technologies for backend development and modern JavaScript frameworks for the frontend.

Core Responsibilities:

• Design and develop RESTful APIs using Spring Boot or similar Java frameworks.

• Build responsive, dynamic frontends using React, Angular, or Vue.js.

• Work with databases (SQL or NoSQL like MySQL, PostgreSQL, MongoDB).

• Deploy applications using Docker, Kubernetes, and CI/CD pipelines.

• Ensure security, scalability, and performance of applications.

• Collaborate with UI/UX designers, backend engineers, and DevOps teams.

Career Opportunities

As a Full Stack Java Developer, you’re in high demand across various industries.

Career Path:

1. Junior Full Stack Developer

2. Full Stack Developer

3. Senior Full Stack Developer

4. Technical Lead / Architect

5. Engineering Manager / CTO

Industries Hiring:

• FinTech & Banking

• E-commerce

• Healthcare Tech

• SaaS Companies

• Government & Defense

• Startups & Tech Giants (Amazon, Infosys, TCS, etc.)

Salary Overview (2025 Estimates)

 Global Averages (Per Year):

Modular Programming in Java is a way to structure your code into independent, reusable modules to improve maintainability, scalability, and readability. It became a first-class concept in Java 9 with the introduction of the Java Platform Module System (JPMS).

What Is a Module?

In Java, a module is a self-contained group of packages, classes, and resources. It declares:

• What it exports (makes available to other modules).

• What it requires (dependencies on other modules).

Key Components of Modular Programming

1. module-info.java

This file is the heart of a Java module.

Example:

module com.example.myapp {
    requires java.sql;
    requires com.example.utils;
    
    exports com.example.myapp.api;
}

• requires = imports another module.

• exports = makes packages visible to other modules.

2. Encapsulation

Only exported packages are accessible outside the module. The rest is hidden, helping reduce tight coupling.

✅ Benefits

• Improved maintainability: Easier to understand and test smaller parts.

• Better encapsulation: Internal APIs stay hidden.

• Faster startup: JVM can optimize module loading.

• Reliable dependencies: Catches missing modules at compile-time.

Example Structure

myapp/
├── module-info.java
├── com/
│   └── example/
│       └── myapp/
│           └── Main.java

Tools and Support

• Build Tools: Maven and Gradle now support modules.

• IDEs: IntelliJ IDEA and Eclipse support module-aware projects.

Gotchas

• Not backward compatible with Java 8 and earlier.

• Requires planning your package structure and visibility carefully.

• Can be overkill for small projects.

When to Use Modular Programming in Java

Use it if:

• You're working on large or enterprise-scale applications.

• You want strong encapsulation and dependency management.

• You're targeting Java 9+ and want better tooling and performance.

Scope and Facility @ Naresh I Technology:

1. At Naresh IT you will get a good Experienced faculty who will guide you, mentor you and nurture you to achieve your dream goal.

2. Here you will get a good hand on practice in terms of practical industry-oriented environment which will definitely help you a lot to shape your future.

3. During the designing process of application, we will let you know about the other aspect of the application too. 

4. Our Expert trainer will let you know about every in’s and out’s about the problem scenario.

Achieving your dream goal is our motto. Our excellent team is working restlessly for our students to click their target. So, believe on us and our advice, and we assured you about your sure success.