Java Installation & Setup

Java Installation & Setup (Step-by-Step Guide)

To write and run Java programs, you need to install:

✔ JDK (Java Development Kit)
✔ A Code Editor or IDE like VS Code, IntelliJ IDEA, or Eclipse

Step 1: Download Java JDK

1. Go to the official Oracle or OpenJDK website:
   👉 (Search: “Download JDK latest version”)

2. Choose your operating system:

   • Windows (x64 Installer)

   • macOS

   • Linux

3. Download the installer and run it.

Step 2: Install JDK

During installation:

• Click Next → Accept → Install → Finish

• Default installation path (Windows example):

  C:\Program Files\Java\jdk-21


Step 3: Set Environment Variables (Windows Only)

This step allows Java commands like javac and java to work in Command Prompt.

1️⃣ Open Environment Variables:

• Press Windows Key → Search: Environment Variables

• Click: Edit system environment variables

• Click: Environment Variables

2️⃣ Set JAVA_HOME

• Under System Variables → New

• Variable name: JAVA_HOME

• Variable value: The JDK installation path, e.g.,

  C:\Program Files\Java\jdk-21


3️⃣ Add to PATH

• Select variable: Path → Edit → New

• Add:

  %JAVA_HOME%\bin


Step 4: Verify Installation

Open Command Prompt (CMD) and type:

You should see something like:

Then type:

You should see:

Step 5: Install an IDE (Optional but Recommended)

VS Code Setup (Optional)

If using Visual Studio Code:

1. Install VS Code

2. Open Extensions panel (Ctrl+Shift+X)

3. Install:

   • ☑ Java Extension Pack

   • ☑ Debugger for Java

   • ☑ Language Support for Java by Red Hat

Step 6: Write First Java Program

Create a file named:

Paste:

Step 7: Compile & Run

Open terminal in the folder containing the file and run:

This will create a file: Hello.class

Now run:

Output:

🎉 Congratulations!

You have successfully installed Java and executed your first program!