What is a method Stub in this homework assignment?

Can someone clarify what a method stub is please?

What do I have to do? Do I have to write test code or just create empty methods? Explain

Instructions: 1. Read and understand the following design on page 2 2. Implement the design with method stubs ONLY Hints: a. What packages are there? Do you need to implement all of them? b. For each class, is it a regular class, a super class, or an interface? c. For an entity (attribute or method), what is its visibility? d Abstract methods are italicized. (This is something we have not discussed yet. But the good news is methods in interfaces are made abstract by default) e. For an entity, is it a static or non-static method? f For an attribute, is it a final variable? g. For a method, what argument(s) does it take? What is its return type? Compar ase grading Gradt sring D va lang Sing av lang Sing frows