4 Points To Do: - In the blank below, please type out the Java code that corresponds to the given UML diagram - Include only the class declarations, all names and types of class variables and method declarations - Leave the method bodies empty (do not provide code/implementation for any methods) Reminder: In UML, when you see a ':' after a variable name, the word following the colon is the type of that variable. Similarly, when you see a ':' at the end of a method, the type there is the return type of the method