1. What class is a superclass of every other class? 2. A class that contains at least one abstract method must, itself, be declared abstract. True or False? 3. What keyword is used to create a named...

1. What class is a superclass of every other class? 2. A class that contains at least one abstract method must, itself, be declared abstract. True or False? 3. What keyword is used to create a named constant? 4. Using the code from Try This 8-1, put the ICharQ interface and its three implementations into a package called qpack. Keeping the queue demonstration class IQDemo in the default package, show how to import and use the classes in qpack.