Select two classes below to implement as an Aggregation relationship. Actor Artist Book Camera Director Employee Instrument Manager Movie Musician Painting Producer Writer 1. Explain why these two classes can be logically represented as an Aggregation 2. Implement both classes including the following a. one data member for each class b. all necessary constructors for each class C. all necessary accessor and mutator functions for each class

You have to implement program that compares graduate students based on their ranks. The design of the program is given in the following UML diagram:   • Student class: Base class that GradStudent extends. • GradStudent class: The objects from this class will be used for comparisons. • Rankable interface: Defines the implementation needed for  comparison. GradStudent implements this interface. • Test class will be used to get student information from the user and demonstrate the comparison of students.

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Association Relationships in Java Using the revised UML Class diagram Resto Fun Final i posted,  continuedeveloping the Resto Fun system by modifying class definitions Create an Order class to break the Many-To-Many relationship between Customer and Item. Thisis a Relationship Class, a class that contains information on the association between to classes.Implement the relationship WaitsOn between Waiter and Customer, knowing that therelationship indicates that this is a One-to-Many relationship mandatory in both ends, i.e., awaiter must wait on a customer and a customer must be waited on by a waiter.Implement the relationship Orders between Customer (Table) and Item, another One-to-Many,since there are many Items a Customers can order, but each Item ordered is for one customeronly.Implement the Add relationship between Order and Item. Include a method to assign the Orderto a Customer before you start adding Items to the Order! There is enough information now to implement the…

Implement all these classes while illustrating the concept of aggregation and composition in terms of ownership and life-cycle. Consider six classes i.e. Person, Department, Laboratory, and University having following specifications. Class University has Two attributes of type string i.e. universityName and location· An attribute named dept of type Department Class Department has Two attributes i.e. deptID, deptName· A two-argument constructor to initialize data fields with user-defined values· A member function display() to show all attribute values Class Laboratory contains Two attributes i.e. labID and experimentNo· A two-argument constructor to initialize data member with user-defined values Class Person has Two attributes i.e. name and age· A parameterized constructor to initialize attributes with user-defined values· A member function display() to show its attribute values

A User class has an association link to a Service class, and calls its compute() method to do mathematical calculations. Because the computation takes time, it is better to first prompt a waiting message, which was not yet provided, to inform the user. However, the Service class is also used by other internal classes that do not need the message. Therefore, your job is to come out a way to provide the message without modifying the association relationship and the code of the Service class. What design pattern is a useful choice? Also,Show the new design in UML class diagram. Extra interfaces or classes can be added.

7. When a class contains objects of another class, the relationship is called a whole-part relationship or composition. The relationship created is also called a has-a relationship. Discuss some of the possible issues with composition, such as the long statement: Outputsales.getHighestPaidEmployee().getHireDate().getYear().

For this problem you are to join the following classes into a hierarchy (use the UML diagrams from Module 2 to get started): Player - Super Class         Archer - Subclass Barbarian - Subclass Cleric - Subclass Rogue - Subclass Warlock - Subclass

Abstract classes and interfaces may both be used to accomplish the goal of defining the behavior of common objects.Which factors should you take into account when deciding whether to utilize an interface or an abstract class?

Class Relationships Exercises 1. In Java, we use inheritance for "is-a" relationships. Containment, on the other hand, indicates that one object has another object. These are "has-a" relationships. For the following relationships, determine if they are a "is-a" or a "has-a" relationship: o bicycle - vehicle o car - engine o pizza - topping o food - pizza o dog - mammal 2. Share with someone else 3 other examples for each of the following relationships: o Inheritance ("is-a" relationship) o Containment ("has-a" relationship) 3. public class PersonInfo { protected String firstName; protected String birthdate; } public class ChildInfo extends PersonInfo { private String schoolName; } public class MotherInfo extends PersonInfo { private String spousename; private ChildInfo children1; private ChildInfo children2; private ChildInfo children3; ... } A. Draw the relationships for the classes above using UML. If a class inherits from another class, draw an open arrow pointing to the base class…