How to Create an Executable JAR File in Java?

Creating an Executable JAR File: A Comprehensive Guide

In software development, packaging your Java application into an executable JAR (Java Archive) file is crucial for easy distribution and deployment. Here's how it's done:

As mentioned in the question, a JAR file is a collection of Java files. To make it executable, you need to specify the main class within the JAR.

Creating a Manifest File (MANIFEST.MF)

A manifest file is required to indicate the main class and provide other metadata. Here's a sample manifest file:

Manifest-Version: 1.0
Main-Class: JarExample

Compiling Classes and Placing Files

Compile your Java source files (e.g., JarExample.java, JarExample$1.java). Place the compiled class files (.class) and the MANIFEST.MF file in the same folder.

Creating the JAR File

Open a command prompt window and navigate to the folder where your files are located. Use the following command to create the executable JAR:

jar cfm jarexample.jar jexample.mf *.class

Replace "jarexample.jar" with the desired name of your JAR file.

Expected Outcome

This command will create an executable JAR file (jarexample.jar) containing your compiled class files and manifest information, making it ready for distribution and execution.

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