Done till part 10

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

@@ -0,0 +1,44 @@
+package com.github.curriculeon;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Classroom {
+
+    private static final Classroom INSTANCE = new Classroom();
+    Students students=Students.getInstance();
+    Instructors instructors=Instructors.getInstance();
+
+    private Classroom() {
+
+    }
+
+
+    public static Classroom getInstance() {
+        return INSTANCE;
+    }
+
+
+    public void hostLecture(Teacher teacher, double numberOfHours){
+        teacher.lecture( students.toArray(),numberOfHours);
+
+    }
+    public void hostLecture(long id, double numberOfHours){
+        Instructor instructor=instructors.findById(id);
+        instructor.lecture( students.toArray(),numberOfHours);
+    }
+
+    public Map<Student,Double> getStudyMap(){
+        Map<Student,Double> studentMap=new HashMap<>();
+
+        for(Student student1 : students.toArray()) {
+            Double studyTime =student1.getTotalStudyTime();
+            studentMap.put(student1,studyTime);
+        }
+        return studentMap;
+    }
+
+
+}
+
+

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

@@ -0,0 +1,26 @@
+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) {
+        double numberOfHoursPerLearner = numberOfHours / learners.length;
+        for (int i = 0; i < learners.length; i++) {
+            Learner learner = learners[i];
+            learner.learn(numberOfHoursPerLearner);
+
+        }
+
+    }
+}

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

@@ -0,0 +1,26 @@
+package com.github.curriculeon;
+
+import java.util.List;
+
+public class Instructors extends People<Instructor> {
+
+    private static final Instructors INSTANCE = new Instructors();
+
+    private Instructors() {
+        super();
+        this.add(new Instructor(01L, "Leon"));
+        this.add(new Instructor(02L, "Haseeb"));
+    }
+
+    @Override
+    public Instructor[] toArray() {
+        int sizeOfArray = count();
+        List<Instructor> oldList = personList;
+        return oldList.toArray(new Instructor[sizeOfArray]);
+    }
+
+
+    public static Instructors getInstance() {
+        return INSTANCE;
+    }
+}

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

@@ -0,0 +1,10 @@
+package com.github.curriculeon;
+
+public interface Learner {
+
+    public void learn(double numberOfHours);
+
+    public double getTotalStudyTime();
+
+
+}

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

@@ -0,0 +1,66 @@
+package com.github.curriculeon;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+abstract public class People <SomeType extends Person>implements Iterable{
+   List<SomeType> personList;
+
+    public People() {
+        this(new ArrayList<>());
+    }
+
+    public People(List<SomeType> personList) {
+
+        this.personList = personList;
+    }
+
+    public void add(SomeType person) {
+
+        personList.add(person);
+    }
+
+    public SomeType findById(long id) {
+        for (SomeType person : personList) {
+            if (person.getId() == id) {
+                return person;
+            }
+        }
+        return null;
+    }
+
+    public Boolean contains(SomeType person) {
+        return personList.contains(person);
+
+    }
+
+    public void remove(SomeType person) {
+        if (personList.contains(person)) {
+            personList.remove(person);
+        }
+
+    }
+
+    public void removeById(long id) {
+        SomeType person = findById(id);
+            personList.remove(person);
+
+    }
+
+    public void removeAll() {
+        personList.clear();
+    }
+
+    public int count() {
+        return personList.size();
+    }
+
+    abstract public SomeType[] toArray();
+
+
+    @Override
+    public Iterator iterator() {
+        return personList.iterator();
+    }
+}

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

@@ -1,5 +1,27 @@
 package com.github.curriculeon;
 
 public class Person {
+    private  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;
+    }
+
+    public Person(){
+        this.id = null;
+    }
 }

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

@@ -0,0 +1,23 @@
+package com.github.curriculeon;
+
+public class Student extends Person implements Learner {
+    double totalStudyTime;
+
+
+
+    public Student(Long id, String name) {
+        super(id, name);
+    }
+
+
+    @Override
+    public void learn(double numberOfHours) {
+        totalStudyTime+=numberOfHours;
+
+    }
+
+    @Override
+    public double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+}

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

@@ -0,0 +1,28 @@
+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(01L, "Anjali"));
+        this.add(new Student(02L, "Deepti"));
+    }
+
+    @Override
+    public Student[] toArray() {
+        int sizeOfArray = count();
+        List<Student> oldList = personList;
+        return oldList.toArray(new Student[sizeOfArray]);
+    }
+
+
+    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 {
+
+    public void teach(Learner learner,double numberOfHours);
+
+    public void lecture(Learner[] learners,double numberOfHours);
+}

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

@@ -0,0 +1,38 @@
+package com.github.curriculeon;
+
+import junit.framework.TestCase;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Map;
+import java.util.Set;
+
+public class ClassroomTest extends TestCase {
+    @Test
+    public void testHostLecture() {
+        //given
+        Classroom classroom = Classroom.getInstance();
+        Teacher teacher = Instructors.getInstance().findById(1L);
+        Integer numberOfStudents = Students.getInstance().count();
+        Double numberOfHoursToLecture = numberOfStudents.doubleValue();
+        Double expectedHoursLearned = 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 + expectedHoursLearned;
+            Double actualStudyTime = postStudyMap.get(student);
+
+            // then
+            Assert.assertEquals(expectedStudyTime, actualStudyTime);
+
+        }
+
+
+    }
+}

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

@@ -0,0 +1,29 @@
+package com.github.curriculeon;
+
+import junit.framework.TestCase;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class InstructorsTest extends TestCase {
+
+
+    @Test
+    public void testGetInstance() {
+        Instructors instructor = Instructors.getInstance();
+        String[] instructorNameArray = {"Leon", "Haseeb"};
+        List<String> listInstructor = Arrays.asList(instructorNameArray);
+
+        Person[] instructorArray = instructor.toArray();
+        for (int i = 0; i < instructorArray.length; i++) {
+            Person person = instructorArray[i];
+            String personName = person.getName();
+            boolean hasPersonWithName = listInstructor.contains(personName);
+            Assert.assertTrue(hasPersonWithName);
+
+        }
+    }
+
+}