Exercise 4

A:

Exercise 5.1 in the book. The topic is the import statement.

B:

Exercise 5.6 in the book. The topic is the access modifiers on classes, i.e., private, protected, and public.

C:

Exercise 5.7 in the book. The topic is the access modifier protected and access via other classes in the same file.

Best regards,
Kristian Torp