L04B: Assignment – Basic Listening with MVC

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L04B: Assignment – Basic Listening with MVC

Do not use the scanner class or any other user input request. You application should be self­

contained and run without user input.

Assignment Objectives

1. Practice on implementing a MVC project
2. Start working with Java Graphics

Deliverables

A zipped Java project according to the How to submit Labs and Assignments guide(attached in the email).

O.O. Requirements (these items will be part of your grade)

1. One class, one file. Don’t create multiple classes in the same .java file
2. Don’t use static variables and methods
3. Encapsulation: make sure you protect your class variables and provide access to them through get and set methods
4. all the classes are required to have a constructor that receives all the attributes as parameters and update the attributes accordingly
5. Follow Horstmann’s Java Language Coding Guidelines

(http://higheredbcs.wiley.com/legacy/college/horstmann/1118087887/style_guide/styleguide.htm)

6. Organized in packages (MVC ­ Model ­ View Controller)

Contents

Regarding the starter Netbeans project you should keep using your project from the last assignment. The Netbeans project that you will use should look like this:

<default package> App.java

Controller

Controller.java

Model

Model.java

MailAddress.java

Student.java

View InitialPanel.java MainFrame.java View.java

Functionality

View is already displaying the students’ information according to the last assignment specification.

Now, the user will be able to click in each button. This action will trigger an update in the text of the button. The new text will bring a new value for credits (obtained using the creditsThisSemester( ) method in student)

Below is a link to a short clip showing the functionality.

A04C_demo.mov (attached in the email)

The number of credits is calculated on the fly in Model and might vary in the output of your assignment. You will need to work on

Controller to implement the inner listeners

Then

1. controller will learn that the button was clicked
2. asks model for an updated student’s information including a new value for credits
3. send the information to be displayed in the button that was clicked

Most likely Model and View have all the functionality that is needed. Most of the work in this assignment is on Controller.

The classes

App

it has the main method which is the method that Java looks for and runs to start any application

it creates 3 objects, one of the Model class, one of the View class and one of the Controller class. When it creates Controller, it passes the two other objects as input parameters so that Controller has access to Model and View.

Model  model  =  new  Model(); View  view  =  new  View();

Controller  controller  =  new  Controller(model,  view);

Controller

will implement inner listeners for each button in View

when a button is clicked, Controller will be informed by the listening mechanism and

will retrieve from Model (using the model object) data about the corresponding student (first button, first student; second button, second student; third button, third student)

will pass the data to View, which will display it in the appropiate button

Model

it is already given in the starter project although you will need to add some functionality

it needs a method that returns data about a specific student in the array (you will write this method or a similar one)

it might need a method that returns all the students’ information but packaged as individual elements

public  class  Model

ArrayList<Student>  sts  =  new  ArrayList<>();

public  Model()

//creates  3  students

MailAddress  addr1  =  new  mailAddress(“107  W  College  Avenue”,  “State  College”,  “PA”,  16801); Student  st1  =  new  student(“Emily”,  “Smith”,  20,  addr1);

MailAddress  addr2  =  new  mailAddress(“200  W  College  Avenue”,  “State  College”,  “PA”,  16801); Student  st2  =  new  student(“Mary”,  “Doe”,  20,  addr2);

MailAddress  addr3  =  new  mailAddress(“300  W  College  Avenue”,  “State  College”,  “PA”,  16801); Student  st3  =  new  student(“John”,  “Doe”,  20,  addr3);

//add  them  to  the  array  of  students sts.add(st1);

sts.add(st2);

sts.add(st3);

MailAddress

it is used by the Student class and doesn’t need any updates

Student

it is used in Model and doesn’t need any updates.

View

In this assignment, is much more complex than in the previous assignment it has a Frame

It has a Panel

The panel has buttons

it needs a method to receive information to be displayed in its buttons

the method needs to receive as an input parameter the text information and the number (or index) of the button to be used

MainFrame

it is a JFrame used as a container for a JPanel

InitialPanel

it needs a layout

it has 3 buttons (the best place to create them might be the constructor)

a method to display information on its buttons the input parameters should be

the string to be displayed

a number telling in which button it should be displayed

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