When you turn in your team projects, you need to include a jar file so that I can also test it. Here are some instructions to do that in the different IDEs.

For Eclipse follow these steps:

• In the Project Explorer (left of the screen) right-click on the project name and choose Export form the pop-up menu.
• Choose the Java - Jar File wizard. The default options should be fine: include the class files and resources. If you are redoing the jar file, make sure that the jar file itself is not selected in the list of things to include at the top right pf the window.
• Click on Browse to select a folder where to save the jar file and a name for it, then click Next.
• In the next window, you can choose to save a description of the jar file in the project. This is not necessary, but can be useful. Then click Next again.
• This next dialog has to do with the manifest, which is a file containing a description of the content of the jar file, and marks the class containing the entry point to execute the program, if applicable. You can save the manifest in the project if you want, but make sure to click Browse at the bottom to choose the class in your project containing the main function. Without this, your jar file will not be executable.

  Now you can click Finish, then go to the folder and double-click on the jar file to make sure that it runs properly.

In NetBeans, here is how I made it work. I used the CelsiusConverter project for this. Once your project compiles and runs, go to the Project Files folder and click on the file pom.xml. You will see in this file something like

<project>

...

</project>

Add a new line just before the closing project tag, and paste the following into it:

<build>
 <plugins>
     <plugin> 

                <!-- Building an executable jar -->

                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.1.0</version>
                <configuration>
                  <archive>
                    <manifest>

                    <!-- give full qualified name of your main class-->
                      <mainClass>CelsiusConverterGUI</mainClass>

                    </manifest>
                  </archive>
                </configuration>
    </plugin>
 </plugins>
</build>

Then change the name of the class CelsiusConverterGUI into the name of the main class in your project. The problem is that NetBeans can easily create a jar file. but it doesn't include the information about the main class properly, and I couldn't find in the properties where to add it.

While you're there, you can also edit the name or version of the jar file it creates. By default, it adds 1.0-SNAPSHOT to the name of the jar file, which I found annoying, so I changed it to 1.0.

After you save this file, go to the Run menu and do Build Project. Then in the project folder, in the target folder, you will find the jar file. You should be able to run it by double-clicking on it.

Please upload the jar file in the GitHub repository of the project.