ee-308-lab9

(i) List some actors that interact with this system. Explain the relevance of each actor.

Your Answer:

The actors: seller, professional anchor, celebrity , executive, consumer.

Seller, an actor who intend to sell goods through the live streaming sale system.

Professional anchor, an actor who employed by sellers to host live shows.

Celebrity, an actor who also want to profit from live streaming system by selling goods or broadcasting.

Executive, an actor who participate in the live stream sale system.

Consumer, an actor who want to purchase goods through watching live shows on the live stream sale system.

(ii) Prepare a use case diagram for this system.

Your Answer:

(iii) Prepare a normal scenario for each use case. (i.e. describe each use case in words)

Your Answer:

Watch live show: Users can use software to open the system and watch live broadcasts.

Purchase goods: Users can buy goods after sign up their account and pay the money online.

Live show: Pushed by the anchors or the sellers to recommend goods.

Sell goods: The system has the channel to let consumers purchase the goods.

Consultation response: Questions consulted by consumers or who is interest in the goods, and sellers or anchors will solute these questions.

Shopping guide: The sellers and professional anchor will teach you how to buy their goods and how to use their goods.

Commodity display: In the studio, the sellers and anchors will display the outlook of the goods and the usage of it to facilitate audience to understand this goods.

(iv) Prepare sequence diagrams or activity diagrams for primary scenarios. By the way, each scenario can be described by a sequence diagram or an activity diagram, but both diagrams must be used in this question.

Your Answer:

(v) Prepare a class diagram for this system. Explain which principles of object-oriented are applied in your design.

Your Answer:

(vi) Prepare state diagrams for primary classes.

Your Answer:

(vii) Write the skeleton code corresponding to the class diagram in C++, Java, Python, or C#.

Your Answer:

public class User

{

    private:

        string name;

        string password;

    public:

        string username;

        void login();

        void register();

        void exit();

};

public class consumer: public User

{

    private:

        void purchase();

    public:

        void watch live show();

        void consult();

        void pay money();

};

public class anchor : public User

{

    public:

        string password;

        int username;

    private:

        void living show();

        void guide shopping();

        void display goods();

};

public class seller: public User

{

    public:

        void update goods' informations();

        void Check();

        void employ anchor();

};

public class goods:

{

    public:

          string names;

          int price;

}