All classes and tests created and passing

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_8">
+    <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/ConcretePeople.java

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+package io.zipcoder.interfaces;
+
+public class ConcretePeople extends People<Person>{
+
+    public Person [] listToArray () {
+        Person[] myPeople = new Person[this.personList.size()];
+        myPeople = this.personList.toArray(myPeople);
+        return myPeople;
+    }
+}

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

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+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher {
+
+
+    KRIS(546L, "Kris"), CHRIS(547L, "Chris"), DOLIO (548L, "Dolio"),  ROBERTO (549L, "Roberto"), FROILAN (550L, "Froilan");
+    Long id;
+    String name;
+
+
+    Educator(Long id, String name){
+        this.id = id;
+        this.name = name;
+    }
+
+    private Double timeTaught;
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        learner.learn(numberOfHours);
+    }
+
+    @Override
+    public void lecture(Double numberOfHours, Learner[] learners) {
+        Double numberOfHoursPerLearner = numberOfHours / learners.length;
+        for( Learner student : learners) {
+            student.learn(numberOfHoursPerLearner);
+        }
+    }
+}

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);
+    }
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        learner.learn(numberOfHours);
+    }
+
+    @Override
+    public void lecture ( Double numberOfHours, Learner[] learners) {
+        Double numberOfHoursPerLearner = numberOfHours / learners.length;
+        for( Learner student : learners) {
+            student.learn(numberOfHoursPerLearner);
+        }
+
+    }
+}

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

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+package io.zipcoder.interfaces;
+
+public class Instructors extends People <Instructor> {
+    private static Instructors INSTANCE;
+
+    private Instructors(){
+//        Instructor Kris = new Instructor (546L, "Kris");
+//        Instructor Chris = new Instructor (547L, "Chris");
+//        Instructor Dolio = new Instructor (548L, "Dolio");
+//        Instructor Roberto = new Instructor (549L, "Roberto");
+//        Instructor Froilan = new Instructor (550L, "Froilan");
+//        personList.add(Kris);
+//        personList.add(Chris);
+//        personList.add(Dolio);
+//        personList.add(Roberto);
+//        personList.add(Froilan);
+
+    }
+
+
+
+    public static Instructors getInstance(){
+        if(INSTANCE == null){
+            INSTANCE = new Instructors();
+        }
+        return INSTANCE;
+    }
+
+    static {
+        INSTANCE = new Instructors();
+        for (int i = 0; i < 5; i++) {
+            INSTANCE.addPerson(new Instructor(i + 2L, "INSTRUCTOR" + i));
+        }
+    }
+
+    @Override
+    public Instructor[] listToArray() {
+        return this.personList.toArray(new Instructor[0]);
+    }
+}

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 = new ArrayList<>();
+
+    public void addPerson (E person){
+        this.personList.add(person);
+    }
+
+    public E findById (Long id) {
+        E target = null;
+        for (E person : this.personList) {
+            if (person.getId().equals(id)) {
+                target = person;
+                break;
+            }
+        }
+        return target;
+    }
+
+    public Boolean containsPerson (E person) {
+         return this.personList.contains(person);
+    }
+
+    public Integer count () {
+        return personList.size();
+    }
+
+    public void removePerson (E person){
+        personList.remove(person);
+    }
+
+    public void removePersonById (Long id) {
+        E personToRemove = findById(id);
+        removePerson(personToRemove);
+    }
+
+
+    public void removeAll (){
+        personList.clear();
+    }
+
+    public abstract E [] listToArray () ;
+
+
+
+    @Override
+    public Iterator<E> iterator() {
+        return this.personList.iterator();
+     }
+}

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

@@ -1,5 +1,23 @@
 package io.zipcoder.interfaces;
 
 public class Person {
+    private final Long id;
+    private String name;
 
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Person (Long id, String name) {
+        this.id = id;
+        this. name = 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  {
+    private Double totalStudyTime;
+
+    public Student(Long id, String name) {
+        super(id, name);
+        this.totalStudyTime = 0D;
+    }
+
+    public void setTotalStudyTime(Double totalStudyTime) {
+        this.totalStudyTime = totalStudyTime;
+    }
+
+    public void learn(Double numberOfHours) {
+        this.totalStudyTime += numberOfHours;
+    }
+
+    public Double getTotalStudyTime() {
+        return this.totalStudyTime;
+    }
+}

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

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+package io.zipcoder.interfaces;
+
+public class Students extends People <Student> {
+    private static Students INSTANCE;
+
+    private Students(){};
+
+    public static Students getInstance(){
+        if(INSTANCE == null){
+            INSTANCE = new Students();
+        }
+        return INSTANCE;
+    }
+
+        static {
+            INSTANCE = new Students();
+            for (int i = 0; i < 35; i++) {
+                INSTANCE.addPerson(new Student(i+1L, "STUDENT"+i));
+            }
+        }
+
+
+    @Override
+    public Student[] listToArray() {
+        return this.personList.toArray(new Student[0]);
+    }
+}
+
+//    //Eager Instantiation
+//    //Nullary constructor with intialized Students
+//    private Students() {
+//    INSTANCE = new Students ()
+//    }

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 (Double numberOfHours, Learner [] learners);
+}