CR-MacroLabs-OOP-InstructorStudentClassroom

Student, Instructor, Classroom

• Purpose - to demonstrate the use of Java interfaces
• Objective - to implement a ZipCodeWilmington singleton which mediates a composite Students and Instructors reference.

Part 1.1 - Create Person Class

• Create a Person class.
  • The class should declare a final field named id of type long.
  • Person constructor should have a parameter of type long which sets the id field to the respective value.
  • The class should define a getId() method which returns the Person object's id field.
  • The class should define a getName() method which returns the Person object's name field.
  • The class should define a setName() method which sets the Person object's name field.

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Part 1.0 - Test Person

• Create a TestPerson class.
  • Create a testConstructor method which ensures that a Person object's id field is being set upon construction.
  • Create a testSetName method which ensures that a Person object's name variable is being set by invoking the .setName method.
  • Create a testConstructor method which ensures that a Person object's name variable is being set by invoking the Person constructor.

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Part 2.0 - Create Learner Interface

• Create a Learner interface.
  • Learner should declare one method signature:
    • Method name: learn
    • Method parameters: double numberOfHours
    • Method return-type: void

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Part 3.1 - Create Student Class

• Create a Student class such that:
  • Student is a subclass of Person
  • Student implements the Learner interface
  • Student should have an instance variable totalStudyTime of type double
  • Student should have a concrete implementation of the learn method which increments the totalStudyTime variable by the specified numberOfHours argument.
  • Student should have a getTotalStudyTime() method which returns the totalStudyTime instance variable.

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Part 3.0 - Test Student

• Create a TestStudent class.
  • Create a testImplementation method that asserts that a Student is an instanceof a Learner.
  • Create a testInheritance method that asserts that a Student is an instanceof a Person.
  • Create a testLearn method that ensures a Student's totalStudyTime instance variable is incremented by the specified numberOfHours by invoking the .learn method.

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Part 4.0 - Create Teacher Interface

• Create a Teacher interface.

  • Teacher should declare a teach method signature:

    • Method name: teach
    • Method parameters:
      • Student student
      • double numberOfHours
    • Method return-type: void

  • Teacher should declare a lecture method signature:

    • Method name: lecture
    • Method parameters:
      • Student[] student
      • double numberOfHours
    • Method return-type: void
      

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Part 5.1 - Create Instructor Class

• Create an Instructor class such that:
  • Instructor is a subclass of Person
  • Instructor implements the Teacher interface
  • Instructor should have a concrete implementation of the teach method which invokes the learn method on the specified Student object.
  • Instructor should have a concrete implementation of the lecture method which invokes the learn method on each of the elements in the specified array of Student objects.
    • numberOfHours should be evenly split amongst the students.
      • double numberOfHoursPerStudent = numberOfHours / students.length;

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Part 5.0 - Test Instructor

• Create a TestInstructor class.
  • Create a testImplementation method that asserts that an Instructor is an instanceof a Teacher.
  • Create a testInheritance method that asserts that a Instructor is an instanceof a Person.
  • Create a testTeach method that ensures when an Instructor invokes the .teach method, a respective student's totalStudyTime instance variable is incremented.
  • Create a testLecture method that ensures when an Instructor invokes the .teach method, a respective student's totalStudyTime instance variable is incremented by the specified numberOfHours.

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Part 6.1 - Create People class

• Create a People class.
  • The class should instantiate an ArrayList field of Person objects named personList.
  • The class should define a method named add which adds a Person to the personList.
  • The class should define a method named findById which makes use of a long id parameter to return a Person object with the respective id field.
  • The class should define a method named remove which makes use of a Person person parameter to remove a respective Person object.
  • The class should define a method named remove which makes use of a long id parameter to remove a Person object with the respective id field.
  • The class should define a method named getCount which returns the size of oersonList.
  • The class should define a method named getArray which returns an array representation of the personList field.
  • The class should define a named removeAll which clears our personList field.
    

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Part 6.0 - Test People

• Create a TestPeople class.
  • Create a testAdd method which ensures that our personList in our People class populated with respective Student objects following invokation of the addStudent method.
  • Create a testRemove method which ensures that the personList in a People object is depopulated with a respective Person object following the invokation of the remove method.
  • Create a testFindById method which ensures that a respective Person object with a respective id field is returned upon invokation of the findById method on a respective People object.

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Part 7.1 - Create Students singleton

• Note: The creation of this class will demonstrate an implementation of singleton design pattern.
• Create a Students class.
  • The class should be an unextendable subclass of the People class.
  • The class should statically instantiate a final field named INSTANCE of type Students.
  • The class should define a private nullary constructor which populates the INSTANCE field with respective Student representations of your colleagues.
    • Each student should have a relatively unique id field.
  • The class should define a getInstance method which returns the INSTANCE field.
    
    

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Part 7.0 - Test Students singleton

• Create a TestStudents class.
  • Create a test method which ensures that each of the students in your current cohort are in your Students singleton.

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Part 7.2 - Create Instructors singleton

• Use Part 7.0 and Part 7.1 as a reference.
• Create a Instructors singleton which represents the set of instructors at ZipCodeWilmington.
• Create a TestInstructors class.

Part 8.1 - Create ZipCodeWilmington Class

• Use Part 7 as a reference.
• Create a ZipCodeWilmington singleton.
  • The class should declare a field that references the instance of Students called students.
  • The class should declare a field that references the instance of Instructors called instructors.
  • The class should define a method hostLecture which makes use of a long id, double numberOfHours parameter to identify a respective Instructor to host a lecture to the composite people field in the cohort reference.

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Part 8.0 - Test ZipCodeWilmington

• Create a TestZipCodeWilmington class.
  • Create a testHostLecture method which ensures that each of the Student's totalStudyTime instance variable is incremented by the specified numberOfHours upon invoking the .hostLecture method.

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Notice the Design Flaw

• You may have notice that findById makes it difficult to intuitively identify which Person object is being returned.
  Additionally, it's challengaing to ensure every Person instance has a unique ID amongst its respective People subclass.
  To remedy this issue, we redesign and refactor. Visit the [enum microlab]()