How to Install Java JDK & Set Path in Windows | 2025 Updated Guide

Java JDK Installation & Setup (2025 Updated Guide)
Welcome to this complete step-by-step tutorial where you will learn how to install Java JDK, configure environment variables, and run your first Java program.
This video is specially designed for beginners who want to learn Java programming and also for students preparing for coding interviews, competitive exams, and government IT exams.

📌 What You’ll Learn in This Video

Downloading the latest Java JDK (2025 version).

Installing Java JDK on Windows 10/11 (step by step).

Setting environment variables (PATH & JAVA_HOME).

Verifying installation in CMD.

Writing and running your first Java program (Hello World).

Solving common installation errors.

Answering FAQs about JDK, JRE, and Java setup.

🔥 Why Java Setup is Important?

Java is one of the most popular programming languages in 2025. It is widely used in:

Backend development

Android development

Web applications

Banking & financial systems

Competitive exams like RRB JE IT, ISRO, SSC, GATE

Before starting Java coding, you must install the Java Development Kit (JDK) and configure your computer properly. Without this, your programs won’t run even if you write correct code. That’s why this video explains everything from scratch.

⚡ Step 1: Download Java JDK

Go to the official Oracle website or OpenJDK page.

Choose the latest JDK version (Java 21 or Java 22 – 2025 update).

Select your OS → Windows, Linux, or macOS.

Download the installer file.

Tip: Always install the LTS (Long Term Support) version for stability.

⚡ Step 2: Install Java JDK

Run the downloaded installer.

Follow the setup wizard.

Choose the installation path (default is recommended).

Wait until the installation finishes.

Pro Tip: Install in a folder without spaces in the path (like C:\Java\jdk-21) to avoid errors.

⚡ Step 3: Setup Environment Variables

Without environment variables, Java commands won’t run in CMD.

👉 Steps to set variables:

Open System Properties → Advanced Settings → Environment Variables.

Create a new variable:

Name: JAVA_HOME

Value: Path of JDK installation folder.
Example: C:\Program Files\Java\jdk-21

Edit PATH variable → Add:

%JAVA_HOME%\bin

⚡ Step 4: Verify Java Installation

Open Command Prompt (CMD).

Type:

java -version
javac -version
✅ If both commands show version details, installation is successful.

⚡ Step 5: Run First Java Program

👉 Write this code and save as Hello.java:

class Hello {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
👉 Compile:

javac Hello.java
👉 Run:

java Hello
✅ Output:

Hello, World!
🎉 Congratulations! You have successfully installed Java and run your first program.

🎯 Common Errors & Fixes

❌ java is not recognized
👉 PATH not set correctly. Fix: Add %JAVA_HOME%\bin in PATH.

❌ javac not found
👉 JDK not installed (only JRE installed). Install full JDK.

❌ class not found
👉 Check file name and class name must match.

❌ Access denied in CMD
👉 Run CMD as Administrator.

💡 FAQs (Frequently Asked Questions)

Q1. Which Java version should I install in 2025?
👉 Java 21 LTS (latest stable version).

Q2. Can I still use Java 8?
👉 Yes, but Java 21 is recommended for modern projects.

Q3. What is the difference between JDK and JRE?
👉 JDK = Development kit (for coding & compiling).
👉 JRE = Runtime only (for running apps).

Q4. Do I need an IDE like Eclipse or IntelliJ?
👉 Optional. You can code in Notepad/VS Code. But JDK is always required.

Q5. Is Java free to use?
👉 Yes, OpenJDK is completely free.

🏆 Why Learn Java in 2025?

Still among top 3 programming languages worldwide.

Used in Android apps, web apps, banking, AI, cloud systems.

Important for competitive programming and IT government exams.

Huge community support and learning resources.

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