Thực hành sử dụng các lớp ẩn danh

1. In the vo package, create public User, Location, Server, Subject, and Subscription classes, which inherit NamedItem. 2. In the Solution class, for each class, create a method that returns a list of instances of the class.

The printName method must display its own name field, i.e. "sout" Make the fewest changes possible.

Make it so that only methods of the Solution class are called in the someActions method. Expected output in the main method: Amigo: Mmmmm, beef; Amigo: knock knock; Amigo: Zzzzzzz...1 s.