done Part 1 // Rachid

src/main/java/com/github/curriculeon/Classroom.java

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+package com.github.curriculeon;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public enum Classroom {
+    INSTANCE;
+    private Students students = Students.getInstance();
+    private Instructors instructors = Instructors.getInstance();
+
+    public void hostLecture (Teacher teacher, Double numberOfHours){
+        teacher.lecture(students.toArray(), numberOfHours);
+    }
+
+    public void hostLecture (long id, Double numberOfHours){
+        Teacher instructor = instructors.findById(id);
+        instructor.lecture(students.toArray(), numberOfHours);
+    }
+    public Map<Student, Double> getStudyMap(){
+        Map<Student, Double> result = new HashMap<>();
+        for (Student student: students.toArray()) {
+            Double studyTime = student.getTotalStudyTime();
+            result.put(student,studyTime);
+        }
+        return result;
+    }
+
+}

src/main/java/com/github/curriculeon/Educator.java

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+package com.github.curriculeon;
+
+public enum Educator implements Teacher {
+    LEON,
+    HASEEB;
+
+    private Double hoursWorked;
+    private final Instructor instructor;
+
+    Educator() {
+        long id = this.ordinal();
+        String name = this.name();
+        this.instructor = new Instructor(id, name);
+        Instructors.getInstance().add(instructor);
+    }
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        instructor.teach(learner, numberOfHours);
+        hoursWorked = numberOfHours;
+    }
+
+    @Override
+    public void lecture(Learner[] learners, Double numberOfHours) {
+        instructor.lecture(learners, numberOfHours);
+        hoursWorked += numberOfHours;
+    }
+}

src/main/java/com/github/curriculeon/Instructor.java

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+package com.github.curriculeon;
+
+public class Instructor extends Person implements Teacher {
+
+    public Instructor(Long id, String name) {
+        super(id, name);
+    }
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        learner.learn(numberOfHours);
+    }
+
+    @Override
+    public void lecture(Learner[] learners, Double numberOfHours) {
+        for (Learner element : learners) {
+            teach(element, (numberOfHours / learners.length));
+        }
+    }
+
+}

src/main/java/com/github/curriculeon/Instructors.java

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+package com.github.curriculeon;
+
+import java.lang.reflect.Constructor;
+
+public class Instructors extends People<Instructor> {
+
+    private static final Instructors instance = new Instructors();
+
+    public Instructors() {
+        this.add(new Instructor(0L, "Leon Hunter"));
+        this.add(new Instructor(1L, "Haseeb Muhammad"));
+    }
+
+    @Override
+    public Instructor[] toArray() {
+        return personList.toArray(new Instructor[count()]);
+    }
+
+    public static Instructors getInstance() {
+        return instance;
+    }
+
+}

src/main/java/com/github/curriculeon/Learner.java

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+package com.github.curriculeon;
+
+public interface Learner {
+    public void learn(Double numberOfHours);
+    public Double getTotalStudyTime();
+}

src/main/java/com/github/curriculeon/People.java

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+package com.github.curriculeon;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public abstract  class People<SomePerson extends Person> implements Iterable<SomePerson> {
+    List<SomePerson> personList;
+
+    public People() {
+        this(new ArrayList<>());
+    }
+
+    public People(List<SomePerson> personList) {
+        this.personList = personList;
+    }
+
+    public void add(SomePerson person){
+        personList.add(person);
+    }
+
+    public SomePerson findById(long id){
+        for (SomePerson person: personList) {
+            if(person.getId().equals(id)){
+                return person;
+            }
+        }
+        return null;
+    }
+
+    public boolean contains(SomePerson person){
+        return this.personList.contains(person);
+    }
+
+    public void remove(SomePerson person){
+        this.personList.remove(person);
+    }
+
+    public void remove(long id){
+        for (Person person: personList) {
+            if(person.getId().equals(id)){
+                this.personList.remove(person);
+            }
+        }
+    }
+
+    public void removeAll(){
+        this.personList.clear();
+    }
+
+    public int count(){
+        return this.personList.size();
+    }
+
+
+    abstract public SomePerson[] toArray();
+
+//    public Person[] toArray(){   //return People or Person ??
+//        return this.personList.toArray(new Person[personList.size()]);
+//    }
+
+    @Override
+    public Iterator<SomePerson> iterator() {
+        return personList.iterator();
+    }
+}

src/main/java/com/github/curriculeon/Person.java

@@ -1,5 +1,23 @@
 package com.github.curriculeon;
 
 public class Person {
+    private final Long id;
+    private String name;
 
+    public Person(Long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
 }

src/main/java/com/github/curriculeon/Student.java

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+package com.github.curriculeon;
+
+public class Student extends Person implements Learner {
+    private double totalStudyTime = 0.0;
+
+    public Student(Long id, String name) {
+        super(id, name);
+    }
+
+    @Override
+    public void learn(Double numberOfHours) {
+        this.totalStudyTime += numberOfHours;
+    }
+
+    @Override
+    public Double getTotalStudyTime() {
+        return  this.totalStudyTime;
+    }
+}

src/main/java/com/github/curriculeon/Students.java

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+package com.github.curriculeon;
+
+import java.util.List;
+
+public class Students extends People<Student> {
+    private static final Students instance = new Students();
+
+    private Students(){
+        super();
+        this.add(new Student(0L, "Chris"));
+        this.add(new Student(1L, "William"));
+        this.add(new Student(2L, "Adam"));
+    }
+
+    @Override
+    public Student[] toArray() {
+        return personList.toArray(new Student[count()]);
+    }
+
+    public static Students getInstance(){
+        return instance;
+    }
+}

src/main/java/com/github/curriculeon/Teacher.java

@@ -0,0 +1,8 @@
+package com.github.curriculeon;
+
+public interface Teacher {
+
+    void teach(Learner learner, Double numberOfHours);
+    void lecture(Learner[] learners, Double numberOfHours);
+
+}

src/test/java/com/github/curriculeon/TestClassroom.java

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+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Map;
+import java.util.Set;
+
+public class TestClassroom {
+    @Test
+    public void testHostLecture() {
+        //given
+        Classroom classroom = Classroom.INSTANCE;
+        Teacher teacher = Instructors.getInstance().findById(0L);
+        Integer numberOfStudents = Students.getInstance().count();
+        Double numberOfHoursToLecture = numberOfStudents.doubleValue();
+        Double expectedNumberOfHoursLearned = numberOfHoursToLecture / numberOfStudents;
+        Map<Student, Double> preStudyMap = classroom.getStudyMap();
+
+        //When
+        classroom.hostLecture(teacher, numberOfHoursToLecture);
+        Map<Student, Double> postStudyMap = classroom.getStudyMap();
+        Set<Student> keySet = postStudyMap.keySet();
+        for (Student student : keySet) {
+            Double preStudyTime = preStudyMap.get(student);
+            Double expectedStudyTime = preStudyTime + expectedNumberOfHoursLearned;
+            Double actualStudyTime = postStudyMap.get(student);
+
+            // then
+            Assert.assertEquals(expectedStudyTime, actualStudyTime);
+        }
+    }
+
+}

src/test/java/com/github/curriculeon/TestInstructor.java

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+package com.github.curriculeon;
+
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructor {
+    @Test
+    public void testImplementation() {
+        //Given
+
+        Instructor instructor = new Instructor(0L, "some Name");
+
+        // When
+        boolean assertion = instructor instanceof Teacher;
+
+        // Then
+        Assert.assertTrue(assertion);
+
+    }
+
+    @Test
+    public void testInheritance() {
+        //Given
+
+        Instructor instructor = new Instructor(0L, "some Name");
+
+        // When
+        boolean assertion = instructor instanceof Person;
+
+        // Then
+        Assert.assertTrue(assertion);
+
+    }
+
+    @Test
+    public void testTeach(){
+        //Given
+
+        Instructor instructor = new Instructor(0L, "some Name");
+        Student student = new Student(0L, "some student");
+        Double numberOfHours = 5.5;
+        Double expected = student.getTotalStudyTime()+ numberOfHours;
+
+        // When
+        instructor.teach(student, numberOfHours);
+        Double actual = student.getTotalStudyTime();
+        // Then
+        Assert.assertEquals(expected, actual, 0);
+    }
+
+    @Test
+    public void testLecture (){
+        //Given
+
+        Instructor instructor = new Instructor(0L, "some Name");
+
+        Student[] students = {  new Student(0L, "Chris"),
+                                new Student(0L, "Adam"),
+                                new Student(2L, "william")};
+
+        Double numberOfHours = 12.0;
+
+        // When
+        instructor.lecture(students, numberOfHours);
+
+        Double expected = numberOfHours/students.length;
+        for (int i = 0; i < students.length ; i++) {
+            Double actual = students[i].getTotalStudyTime();
+            // Then
+            Assert.assertEquals(expected, actual, 0);
+        }
+
+
+
+    }
+
+}

src/test/java/com/github/curriculeon/TestInstructors.java

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+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.lang.reflect.Constructor;
+import java.util.Arrays;
+import java.util.List;
+
+public class TestInstructors {
+    @Test
+    public void test() {
+
+        Instructors instructors = Instructors.getInstance();
+        String[] instructorsArray = {"Leon Hunter", "Haseeb Muhammad"};
+        List<String> studentNameList = Arrays.asList(instructorsArray);
+
+        Instructor[] InstructorArray = instructors.toArray();
+        for (Instructor instructor : InstructorArray) {
+            boolean hasPersonWithName = studentNameList.contains((instructor.getName()));
+            Assert.assertTrue(hasPersonWithName);
+        }
+    }
+}