Complete

interfaces-1.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.12" level="project" />
+    <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+  </component>
+</module>

src/main/java/io/zipcoder/interfaces/Educator.java

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+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher {
+    KRIS(new Instructor(35, "Kris"),0),
+    ROBERTO(new Instructor(36, "Roberto"),0),
+    CHRIS(new Instructor(37, "Chris"),0);
+
+    private final Instructor instructor;
+    double timeWorked;
+
+    Educator(Instructor instructor, double timeWorked){
+        this.instructor = instructor;
+        this.timeWorked = timeWorked;
+        Instructors instructors = Instructors.getInstance();
+        instructors.addPerson(instructor);
+    }
+
+    public void teach(Learner learner, double numberOfHours) {
+        this.instructor.teach(learner,numberOfHours);
+        timeWorked += numberOfHours;
+    }
+
+    public void lecture(Learner[]learners, double numberOfHours) {
+        this.instructor.lecture(learners,numberOfHours);
+        timeWorked += numberOfHours;
+    }
+
+    public double getTimeWorked() {
+        return timeWorked;
+    }
+}

src/main/java/io/zipcoder/interfaces/Instructor.java

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+package io.zipcoder.interfaces;
+
+public class Instructor extends Person implements Teacher {
+
+    public Instructor(long id, String name) {
+        super(id, name);
+    }
+
+    public void teach(Learner learner, double numberOfHours) {
+        learner.learn(numberOfHours);
+
+    }
+
+    public void lecture(Learner[] learners, double numberOfHours) {
+        double numberOfHoursPerLearner = numberOfHours/learners.length;
+
+        for (int i = 0; i < learners.length; i++) {
+            learners[i].learn(numberOfHoursPerLearner);
+        }
+    }
+
+}

src/main/java/io/zipcoder/interfaces/Instructors.java

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+package io.zipcoder.interfaces;
+
+public final class Instructors extends People<Instructor> {
+    private static final Instructors INSTANCE = new Instructors();
+
+    private Instructors() {
+
+        Instructor instructor = new Instructor(35, "Kris");
+        Instructor instructor1 = new Instructor(36, "Roberto");
+        Instructor instructor2 = new Instructor(37, "Chris");
+
+        personList.add(instructor);
+        personList.add(instructor1);
+        personList.add(instructor2);
+    }
+
+    public Instructor[] toArray() {
+        return personList.toArray(new Instructor[personList.size()]);
+    }
+
+    public static Instructors getInstance(){
+        return INSTANCE;
+    }
+}

src/main/java/io/zipcoder/interfaces/Learner.java

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+package io.zipcoder.interfaces;
+
+public interface Learner {
+
+
+    void learn(double numberOfHours);
+    double getTotalStudyTime();
+
+    }
+

src/main/java/io/zipcoder/interfaces/People.java

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+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public abstract class People<E extends Person> implements Iterable<E> {
+
+    List<E> personList;
+
+    public People(){
+        personList= new ArrayList<E>();
+    }
+
+    public void addPerson(E person){
+        personList.add(person);
+    }
+
+    public Person findById(Long id){
+        Person personFinder = null;
+        for (int i = 0; i < personList.size(); i++) {
+            if (personList.get(i).getId()==id){
+                personFinder = personList.get(i);
+            }
+        }return personFinder;
+    }
+
+    public Boolean contains(E person){
+        return personList.contains(person);
+    }
+
+    public void removePerson(E person){
+        personList.remove(person);
+    }
+
+    public void removeById(Long id) {
+        for (int i = 0; i < personList.size(); i++) {
+            if (personList.get(i).getId() == id) {
+                personList.remove(personList.get(i));
+            }
+        }
+    }
+    public void removeAll(){
+        personList.removeAll(personList);
+    }
+
+    public int count(){
+        return personList.size();
+    }
+
+    public abstract E[] toArray();
+
+
+
+    public Iterator<E> iterator() {
+        return personList.iterator();
+    }
+}

src/main/java/io/zipcoder/interfaces/Person.java

@@ -1,5 +1,29 @@
 package io.zipcoder.interfaces;
 
 public class Person {
+    final Long id;
+    private String name;
+
+
+    public Person(long id, String name) {
+        this.name = name;
+        this.id = id;
+    }
+        public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+
+
+
 
 }
+

src/main/java/io/zipcoder/interfaces/Student.java

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+package io.zipcoder.interfaces;
+
+public class Student extends Person implements Learner {
+    double totalStudyTime;
+
+
+
+    public Student(long id, String name) {
+        super(id, name);
+    }
+
+
+    public void learn(double numberOfHours) {
+        totalStudyTime+=numberOfHours;
+    }
+
+    public double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+
+
+}

src/main/java/io/zipcoder/interfaces/Students.java

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+package io.zipcoder.interfaces;
+
+public final class Students extends People<Student> {
+    private static final Students INSTANCE = new Students();
+
+    private Students() {
+        Student student = new Student(25, "Sandy");
+        Student student1 = new Student(26, "Meeeee");
+        Student student2 = new Student(27, "Kievina");
+
+        personList.add(student);
+        personList.add(student1);
+        personList.add(student2);
+    }
+
+    public Student[] toArray() {
+        return personList.toArray(new Student[personList.size()]);
+    }
+
+    public static Students getInstance() {
+        return INSTANCE;
+    }
+
+
+
+}
+

src/main/java/io/zipcoder/interfaces/Teacher.java

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+package io.zipcoder.interfaces;
+
+public interface Teacher {
+    void teach(Learner learner, double numberOfHours);
+    void lecture(Learner[]learners,double numberOfHours);
+
+}

src/main/java/io/zipcoder/interfaces/ZipCodeWilmington.java

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+package io.zipcoder.interfaces;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public final class ZipCodeWilmington {
+    private static final ZipCodeWilmington INSTANCE = new ZipCodeWilmington();
+    private static final Students students = Students.getInstance();
+    private static final Instructors instructors = Instructors.getInstance();
+
+
+    private ZipCodeWilmington() {
+
+    }
+
+    public void hostLecture(Teacher teacher, double numberOfHours) {
+        teacher.lecture(students.toArray(), numberOfHours);
+    }
+
+    public void hostLecture(long id, double numberOfHours) {
+        Teacher teacher = (Instructor) instructors.findById(id);
+        teacher.lecture(students.toArray(), numberOfHours);
+
+
+    }
+
+    public Map getStudyMap() {
+        Map<Student, Double> timeMap = new HashMap<Student, Double>();
+
+        for (Student s : students) {
+            timeMap.put(s, s.getTotalStudyTime());
+        }
+        return timeMap;
+    }
+
+    public static ZipCodeWilmington getInstance() {
+        return INSTANCE;
+    }
+
+
+}