How to package a project as a JAR file and run it in Eclipse?

To package the project into a jar file and run it, you can follow these steps:

1. In Eclipse, right-click on the project and choose “Export”.
2. In the pop-up dialog, expand the “Java” folder and select “Runnable JAR file”.
3. Click on “Next” to continue.
4. Select the main class to be packaged in the “Launch configuration” dropdown menu.
5. Choose the path and name to save the generated jar file in the “Export destination” field.
6. You can choose to include library files in the generated jar file or use external library files at runtime.
7. Click on “Finish” to complete the packaging process.

After completing the above steps, an executable jar file will be generated. The project can be run by double-clicking on the jar file or using the command “java -jar .jar” in the command line.