Create a Class Students class Student : name(String), rollNumber(int), subject(Optional>).
A student can or cannot have subjects associated.
- Find the students associated with a room that have no subjects associated.
- Find the unique subject list of the students associated with a room that has roomID "xyz".
- print "hello Student" if a room has students associated.
- Test coverage must be greater than 90%.
- Checkstyle, pmd, findbugs warnings must be 0.
- Document every method.