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Get the official Oracle JDK 25 LTS installer for Windows.

1. Visit Oracle JDK Downloads
2. Select Java 25 (LTS).
3. Under Windows tab, click the .exe installer (e.g., jdk-25_windows-x64_bin.exe).

1. Double-click the downloaded .exe file.
2. Click Next on the welcome screen.
3. Leave default installation path: C:\Program Files\Java\jdk-25 → click Next.
4. Wait for installation (usually under 1 minute).
5. Click Close to finish.

Properly configuring JAVA_HOME and PATH ensures Java works from anywhere in Command Prompt.

🔹 Set JAVA_HOME

1. Press Windows + S, type “Environment Variables” → select Edit the system environment variables.
2. In System Properties → click Environment Variables.
3. Under System variables, click New.
4. Variable name: JAVA_HOME
   Variable value: C:\Program Files\Java\jdk-25
5. Click OK.

🔹 Update PATH Variable

1. In the same System variables, find and double-click Path.
2. Click New and add: %JAVA_HOME%\bin
3. Click OK on all windows. Restart Command Prompt if it was open.

Open a fresh Command Prompt (Win + R → cmd) and run these commands:

java -version

javac -version

Let’s write the classic “Hello, World!” to ensure full functionality.

1. Open Notepad (or VS Code).
2. Copy this code:

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World! Java 25 is ready.");
    }
}

3. Save as HelloWorld.java on your Desktop.
4. Open Command Prompt, navigate to Desktop:

cd %USERPROFILE%\Desktop

5. Compile:

javac HelloWorld.java

6. Run:

java HelloWorld