How to run a Java program from Notepad

Install JDK and set JAVA_HOME and PATH. 2. Write Java code in Notepad and save as HelloWorld.java. 3. Use NPPExec plugin to run commands: cd "$(CURRENT_DIRECTORY)", javac "$(FILE_NAME)", java "$(NAME_PART)". 4. Save script and assign shortcut for one-click compile and run.

To run a Java program from Notepad , you don't need an IDE like Eclipse or IntelliJ. You can write, compile, and execute Java code directly using Notepad and the command-line tools included with the JDK. Here's how.

1. Install Java Development Kit (JDK)

Before running Java from Notepad , ensure the JDK is installed on your system.

• Download the JDK from the Oracle or OpenJDK website.
• Install it and make sure to set the JAVA_HOME environment variable.
• Add the bin folder of the JDK (e.g., C:\Program Files\Java\jdk-xx\bin) to your system's PATH environment variable.

Verify installation by opening Command Prompt and typing:

You should see version info for both.

2. Write Java Code in Notepad

Open Notepad and write a simple Java program. For example:

Save the file as HelloWorld.java in a folder of your choice (e.g., C:\JavaPrograms). Make sure the file name matches the class name exactly, including case.

3. Compile and Run Using NPPExec Plugin

Notepad has a plugin called NPPExec that allows executing external commands, such as compiling and running Java.

• Go to Plugins → NPPExec → Execute (or press F6).
• In the script window, enter the following commands:

This tells the system to:

• Change directory to where your Java file is saved.
• Compile the Java file using javac.
• Run the compiled class using java.

Click Save and give the script a name like "Run Java". You can now run this script anytime with a shortcut.

4. Shortcut for One-Click Execution

To make it faster:

• After saving the NPPExec script, go to Plugins → NPPExec → Advanced Options.
• Under "Menu items", select your saved script and click "Add/Modify" to add it to the menu.
• Optionally assign a shortcut key via Settings → Shortcut Mapper → Plugin Commands.

Now you can compile and run your Java program with just one click or keystroke.

Basically, Notepad becomes a lightweight Java coding environment when combined with JDK and NPPExec. It’s fast, simple, and great for learning or small projects.

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