Java Project

In Brief...

For this Java project, you will create a Java program for a school. The purpose is to create a report containing one or more classrooms. For each classroom, the report will contain:

The room number of the classroom.

The teacher and the subject assigned to the classroom.

A list of students assigned to the classroom including their student id and final grade.

Instructions

Application Structure

Projects should be organized into libraries or packages of classes that fall into general categories. This project can be divided into two packages:

school which contains JavaBeans that naturally fall into that category.

util which contain general purpose classes.

In your project directory create the listed subdirectories. They will be the packages used for the JavaBeans, interfaces, and utilities required:

util

school

The util Package Files

Your class files for your course supplied the KeyboardReader class. Copy the KeyboardReader.java into the util package.

In the util package, create the Displayable interface. The interface should declare one method as follows:

public abstract String display() 

The following shows the directories and files you should have at this point:

Project Directoryutil package

KeyboardReader.java

Displayable.java

school package

The school Package Files

Object-Oriented programs become more maintainable, flexible, and saleable when programmers use inheritance, encapsulation, polymorphism, and abstraction. The following descriptions of the classes in the school package should leverage these principles.

Create the Person JavaBean

In the school package, create the Person JavaBean. Make it an abstract class. Declare the following instance variables:

String firstName

String lastName

Include the getter and setter methods for each variable. Use the camel case naming convention for JavaBean methods and variables. Include a method named getFullName() that returns both names concatenated into a String with a space between the first and last names.

Create the Teacher JavaBean class

Create the Teacher class in the school package. It inherits the Person abstract class and implements the Displayable interface. It defines only one variable as follows:

String subject

Include the getter and setter method for the variable. Use the camel case naming convention for JavaBeans. Provide a no argument constructor. Provide another constructor that uses the following parameters to initialize the variables:

String firstName

String lastName

String subject

Override the display() method. It should return a String containing the teacher's full name using the getFullName() method defined in Person and the subject taught as follows:

Roger Sakowski teaches English. 

Create the Student JavaBean Class

Create the Student class in the school package. It inherits the Person abstract class and implements the Displayable interface. It defines two variables:

int studentId

int finalGrade

Include the getter and setter methods for the variables. Use the camel case naming convention for JavaBeans. Override the display()method. It should return a Stringcontaining the student's id, the student's full name using the getFullName() method defined in Person, and the student's final grade as follows:

Student ID: 1 John Doe Final Grade: 90 

Create the Classroom JavaBean Class

Create the Classroom class in the school package. It implements the Displayable interface. It defines three instance variables:

int roomNumber

Displayable teacher (note that the Teacher instance is downcast to the Displayable interface)

ArrayList students (note that the Student instances in the list are downcast to the Displayable interface)

Provide a no argument constructor. Provide another constructor that uses the following parameters to initialize the variables:

int roomNumber

Displayable teacher

ArrayList students

The packages and files you have created so far should look like the following:

Project Directoryutil package

KeyboardReader.java

Displayable.java

school package

Person.java

Teacher.java

Student.java

Classroom.java

Programming Logic

The PrintReports class

A well designed program depends on source code that not only does the job, but does it in a highly maintainable and efficient way. There should never be blocks of duplicate code and methods should be simple and designed to one thing. The PrintReports class will contain most of the programming logic for this project. Organization of methods and their responsibilities are the focus of this section.

Create PrintReports

In your project directory create the PrintReports class.

Project Directory

PrintReports.java

util package

KeyboardReader.java

Displayable.java

school package

Person.java

Teacher.java

Student.java

Classroom.java

It will define the main() method.

Create support methods signatures

PrintReports should define the following methods using the listed method signatures:

public Displayable enterClassroom()

public Displayable enterTeacher()

public Displayable enterStudent()

void report(ArrayList)

You can leave them as skeleton code for now. We will cover the logic they should contain in turn.

Working with non-static methods

Note that the methods are not static. One way to escape the static requirement main() imposes is to use this approach:

public static void main(String[] args) { new PrintReports(); } public PrintReports(){ // Your code goes here } 

The public PrintReports() Constructor

In a dowhile loop collect the data need to create a Classroom object using the enterClassroom() method. You should be able to create any number of Classroomobjects. Prompt the user so he or she can enter another Classroom or quit the loop. Store the Classroom objects in an ArrayList collection.

The public Displayable enterClassroom() Method

Using KeyboardReader, prompt the user for a room number. Save it as an int. The room number must be 100 or greater. If the user enters a lower number, he or she should be prompted again until an acceptable number is entered.

Call enterTeacher() to obtain an instance of a teacher and store it as a Displayable object.

In a dowhile loop, call enterStudent() to obtain a Student as a Displayable object and store it in an ArrayList collection. Prompt the user so he or she can enter another student or quit the loop.

The public Displayable enterTeacher() Method

The method should prompt the user using KeyboardReader for their first and last name as well as the subject they teach. Create an instance of Teacher using that data and return the object as an instance of Displayable.

The public Displayable enterStudent() method

Prompt the user for the student id, first and last names, and their final grade. Using that data, create a Student instance. A student's id must be greater than 0. A student's final grade must be between 0 and 100. Return the Student object as a Displayable object.

The void report(ArrayList) Method

In a for loop, iterate through the ArrayList collection containing the downcast Classroom objects.

Call the display() method defined in Classroom. It should report the room number.

It should call the display() method in the teacher variable to report the teacher assigned to the classroom.

In a for loop it should iterate through the ArrayList collection of Student objects calling the display() method for each one.

The Report Example

The following is an example of output produced by the report() method. For brevity, it only demonstrates one classroom containing one student. Your program should allow you to create multiple classrooms and multiple students per classroom.

First You Need To Create A Classroom Enter Room Number: 101 Now You Need To Enter A Teacher For The Classroom. Enter Teacher First Name: Sam Enter Teacher Last Name: Huston Enter Subject Taught: English Now You Need To Add Students For The Classroom Enter Student First Name: Sally Enter Student Last Name: Jones Enter Student ID: 1 Enter Student Final Grade: 90 Enter Another Student? (Y/N): n (y should prompt for a new student) Enter Another Classroom? (Y/N): n (y should prompt for a new classroom) ---------------------------------------------------------- Room Number: 101 Sam Huston teaches English Student ID: 1 Sally Jones Final Grade: 90 ----------------------------------------------------------