Create The ValkyrieDemo Class
Open the Java Perspective
You'll want to have the Java Perspective open before you create and edit your class. After importing the Gradle Project you are often left with the Gradle Tasks window open and the Java Perspective minimized. Click the maximize perspective button on the right of the Eclipse IDE window to expand the Java Perspective.

Once expanded you should see the GradleProject selected on the left and Java on the top right.

Create a New Class to Run the Valkyrie Simulation
Press Ctrl+N (Cmd+N on OS X) to bring up the "New" wizard, type out "Class" to filter down to the "Class" option, and then click Next.

Java classes are organized by "packages". Many IHMC packages start with us.ihmc, you can use your organization, a personal website, or whatever you'd like as your package. Here we're going to use us.ihmc.demo as the package, and ValkyrieDemo as the name of the class. Fill out this information and click Finish:

Fill in the class to look like the following:
