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+            <element signature="e#214#215#0" expanded="true" />
+            <element signature="e#239#240#0" expanded="true" />
+            <element signature="e#241#242#0" expanded="true" />
+            <element signature="e#289#290#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Instructors.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="233">
+          <caret line="22" column="22" lean-forward="true" selection-start-line="22" selection-start-column="22" selection-end-line="22" selection-end-column="22" />
+          <folding>
+            <element signature="e#735#736#0" expanded="true" />
+            <element signature="e#766#767#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Teacher.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="30">
+          <caret line="2" column="25" selection-start-line="2" selection-start-column="25" selection-end-line="2" selection-end-column="25" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/ZipCodeWilmington.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="225">
+          <caret line="15" column="35" lean-forward="true" selection-start-line="15" selection-start-column="35" selection-end-line="15" selection-end-column="35" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/ZipCodeWilmingtonTest.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="285">
+          <caret line="19" lean-forward="true" selection-start-line="19" selection-end-line="19" />
+        </state>
+      </provider>
+    </entry>
+  </component>
+</project>

README.md

@@ -184,15 +184,15 @@
 
 -
 # Notice the Design Flaw - Non-Intuitive Orientation
-* You may have noticed that `findById` makes it difficult to intuitively identify _which_ `Person` object is being returned. To remedy this issue, we can make use of an `enum` which manipulates a composite `instructor` object.
+* You may have noticed that `findById` makes it difficult to intuitively identify _which_ `Person` object is being returned. To remedy this issue, we can make use of an `enum` which manipulates a composite `instructorTest` object.
 
 -
 ### Part 11.1 - Create `Educator` enum
 * Create an enum named `Educator`.
 	* The enum should implement `Teacher`.
 	* The enum should have an enumeration for each of the instructors represented in the `Instructors` class.
-	* Upon construction each enumeration of the enum should instantiate a respective `Instructor` and assign it to a final `instructor` field upon construction. The `instructor` should be added to the `Instructors` singleton.
-	* Calls to the `teach` and `lecture` method should be differed to the composite `instructor` reference.
+	* Upon construction each enumeration of the enum should instantiate a respective `Instructor` and assign it to a final `instructorTest` field upon construction. The `instructorTest` should be added to the `Instructors` singleton.
+	* Calls to the `teach` and `lecture` method should be differed to the composite `instructorTest` reference.
 	* The enum should have a `double timeWorked` field which keeps track of the hours that the `Educator` has taught.
 
 -

interfaces-1.iml

@@ -0,0 +1,16 @@
+<?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>

pom.xml

@@ -5,7 +5,19 @@
   <groupId>io.zipcoder</groupId>
   <artifactId>interfaces-1</artifactId>
   <version>0.0.1-SNAPSHOT</version>
-  <packaging>jar</packaging>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <packaging>jar</packaging>
 
   <name>interfaces-1</name>
   <url>http://maven.apache.org</url>

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

@@ -0,0 +1,45 @@
+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher {
+    KRIS(1, "Kris Younger"),
+    NHU(2, "Nhu Nguyen"),
+    FROILAN(3, "Froilan Miranda"),
+    WILHEM(4, "Wilhem Alcivar"),
+    DOLIO(5, "L. Dolio Durant");
+
+
+    private double timeWorked = 0;
+    private long id;
+    private String name;
+
+    Educator(long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public double getTimeWorked() {
+        return timeWorked;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public void teach(Learner learner, double numberOfHours) {
+        learner.learn(numberOfHours);
+        timeWorked += numberOfHours;
+    }
+
+    @Override
+    public void lecture(Learner[] learners, double numberOfHours) {
+        for (Learner learner : learners) {
+            learner.learn(numberOfHours/learners.length);
+        }
+        timeWorked += numberOfHours;
+    }
+}

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

@@ -0,0 +1,25 @@
+package io.zipcoder.interfaces;
+
+import java.util.stream.*;
+
+public class Instructor extends Person implements Teacher {
+
+    public Instructor(long id){
+        super(id);
+    }
+
+    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) {
+        Stream<Learner> learnerStream = Stream.of(learners);
+
+        learnerStream.forEach((student) -> student.learn(numberOfHours));
+    }
+
+
+}

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

@@ -0,0 +1,31 @@
+package io.zipcoder.interfaces;
+
+import java.util.Arrays;
+
+public final class Instructors extends People<Instructor> {
+
+    private final static Instructors INSTANCE = new Instructors();
+    Educator[] educatorValues = Educator.values();
+
+    private Instructors() {
+        for (Educator e : educatorValues) {
+            personList.add(new Instructor(e.getId(), e.getName()));
+        }
+    }
+
+    public static Instructors getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public Instructor[] getArray() {
+        Instructor[] instructors = new Instructor[personList.size()];
+        int count = 0;
+
+        for (Instructor instructor : personList) {
+            instructors[count] = instructor;
+            count++;
+        }
+        return instructors;
+    }
+}

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

@@ -0,0 +1,6 @@
+package io.zipcoder.interfaces;
+
+public interface Learner {
+
+    void learn(double numberOfHours);
+}

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

@@ -0,0 +1,28 @@
+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+
+public abstract class People <E extends Person>{
+    ArrayList<E> personList = new ArrayList<E>();
+
+    public People() {
+
+    }
+
+    public void add(E p){
+        personList.add(p);
+    }
+
+    public Person findById(long i){
+
+        Person p = personList.stream()
+                .filter(person -> person.getId() == i)
+                .findFirst()
+                .get()
+                ;
+
+        return p;
+    }
+
+    public abstract E[] getArray();
+}

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

@@ -1,5 +1,28 @@
 package io.zipcoder.interfaces;
 
 public class Person {
+    final long id;
+    String name;
 
+    public Person(long id) {
+
+        this.id = id;
+    }
+    
+    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/io/zipcoder/interfaces/Student.java

@@ -0,0 +1,24 @@
+package io.zipcoder.interfaces;
+
+public class Student extends Person implements Learner{
+    private double totalStudyTime;
+
+    public Student(long id) {
+        super(id);
+    }
+    public Student(long id, String name) {
+        super(id, name);
+    }
+
+    public void learn(double numberOfHours) {
+        totalStudyTime += numberOfHours;
+    }
+
+    public double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+
+    public void setTotalStudyTime(double totalStudyTime) {
+        this.totalStudyTime = totalStudyTime;
+    }
+}

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

@@ -0,0 +1,80 @@
+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+
+public final class Students extends People<Student> {
+
+    private final static Students INSTANCE = new Students();
+
+    public Students() {
+        personList.add(new Student(1, "Ned Redmond"));
+        personList.add(new Student(2, "Seth Abrams"));
+        personList.add(new Student(3, "Akeem Cherry"));
+        personList.add(new Student(4, "Whitney Martinez"));
+        personList.add(new Student(5, "Nira Parikh"));
+        personList.add(new Student(6, "Connor Dunnigan"));
+        personList.add(new Student(7, "Christian Sheridan"));
+        personList.add(new Student(8, "Curtis Cook"));
+        personList.add(new Student(9, "Nuridalia Hernandez"));
+        personList.add(new Student(10, "Brandon DeFrancis"));
+        personList.add(new Student(11, "De'Jon Johnson"));
+        personList.add(new Student(12, "Demetrius Murray"));
+        personList.add(new Student(13, "Elliott Stansbury"));
+        personList.add(new Student(14, "Nathan Hall"));
+        personList.add(new Student(15, "Jae Joson"));
+        personList.add(new Student(16, "Jacob Anderson"));
+        personList.add(new Student(17, "Jose Bedolla"));
+        personList.add(new Student(18, "Jenn Chao"));
+        personList.add(new Student(19, "Jennifer Tinkler"));
+        personList.add(new Student(20, "Jonathan Hinds"));
+        personList.add(new Student(21, "Jay Samuels"));
+        personList.add(new Student(22, "Jevit Tith"));
+        personList.add(new Student(23, "Lauren Green"));
+        personList.add(new Student(24, "Kate Moore"));
+        personList.add(new Student(25, "Michelle DiMarino"));
+        personList.add(new Student(26, "Maggie Pierse"));
+        personList.add(new Student(27, "Nick Satinover"));
+        personList.add(new Student(28, "Chaitali Patel"));
+        personList.add(new Student(29, "Yesoda Sanka"));
+        personList.add(new Student(30, "Saurav Kamath"));
+        personList.add(new Student(31, "Sam Bhutani"));
+        personList.add(new Student(32, "Soujanya Buragapu"));
+        personList.add(new Student(33, "Steffon Williams"));
+        personList.add(new Student(34, "Zavon Malone"));
+        personList.add(new Student(35, "Thuy Kong"));
+        personList.add(new Student(36, "Thulasi Puppala"));
+        personList.add(new Student(37, "Trinh Tong"));
+        personList.add(new Student(38, "William Brown"));
+        personList.add(new Student(39, "Xzavia Cuello"));
+    }
+
+    public <E> Students(ArrayList<E> students) {
+
+    }
+
+    @Override
+    public Student findById(long i){
+
+        Student p = personList.stream()
+                .filter(person -> person.getId() == i)
+                .findFirst()
+                .get()
+                ;
+
+        return p;
+    }
+    public static Students getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public Student[] getArray() {
+        Student[] students = new Student[personList.size()];
+        int count = 0;
+        for (Student student : personList) {
+            students[count] = student;
+            count++;
+        }
+        return students;
+    }
+}

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

@@ -0,0 +1,9 @@
+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

@@ -0,0 +1,20 @@
+package io.zipcoder.interfaces;
+
+public enum  ZipCodeWilmington {
+    INSTANCE;
+
+    Students students = Students.getInstance();
+    Instructors instructors = Instructors.getInstance();
+
+    public void hostLecture(Teacher teacher, double numberOfHours) {
+        Student[] studentsArray = students.getArray();
+        teacher.lecture(studentsArray, numberOfHours);
+    }
+
+    public void hostLecture(long id, double numberOfHours) {
+        Student[] studentsArray = students.getArray();
+        Teacher teacher = (Teacher) instructors.findById(id);
+        teacher.lecture(studentsArray, numberOfHours);
+
+    }
+}

src/test/java/io/zipcoder/interfaces/InstructorTest.java

@@ -0,0 +1,62 @@
+package io.zipcoder.interfaces;
+
+import org.junit.*;
+
+import java.util.Optional;
+import java.util.stream.Stream;
+
+
+public class InstructorTest {
+    Instructor instructor;
+    Student[] students;
+
+    @Before
+    public void setup(){
+        instructor = new Instructor(1);
+        students = new Student[]{new Student(0),new Student(1),new Student(2)};
+    }
+
+    @Test
+    public void testImplementation(){
+        //When
+        boolean actual = instructor instanceof Person;
+        //Then
+        Assert.assertTrue(actual);
+    }
+    @Test
+    public void testInheritence(){
+        //When
+        boolean actual = instructor instanceof Teacher;
+        //Then
+        Assert.assertTrue(actual);
+    }
+
+    @Test
+    public void testTeach(){
+        //Given
+        double expected = 1;
+        //When
+        instructor.teach(students[0], 1);
+        double actual = students[0].getTotalStudyTime();
+        //Then
+        Assert.assertEquals(expected, actual, 0);
+
+    }
+    @Test
+    public void testLecture(){
+        //Given
+        Double expected = 6d;
+        //When
+        instructor.lecture(students,2);
+        Double actual = Stream.of(students)
+                .map(Student::getTotalStudyTime)
+                .reduce((x,y) -> x + y)
+                .get()
+                ;
+        //Then
+        Assert.assertEquals(expected, actual, 0);
+
+    }
+
+
+}

src/test/java/io/zipcoder/interfaces/PeopleTest.java

@@ -0,0 +1,36 @@
+package io.zipcoder.interfaces;
+
+import org.junit.*;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class PeopleTest {
+    Instructor instructor;
+    Student[] students;
+    Student john;
+    Student sarah;
+    Student bob;
+
+    @Before
+    public void setup(){
+        instructor = new Instructor(1);
+        bob = new Student(0);
+        john = new Student(1);
+        sarah = new Student(2);
+        students = new Student[]{bob,john,sarah};
+    }
+
+    @Test
+    public void testFindById(){
+        //Given
+        People people = new Students(new ArrayList<>(Arrays.asList(students)));
+        Person expected = sarah;
+
+        //When
+        Person actual = people.findById(2);
+
+        //Then
+        Assert.assertEquals(expected,actual);
+    }
+}

src/test/java/io/zipcoder/interfaces/StudentsTest.java

@@ -0,0 +1,25 @@
+package io.zipcoder.interfaces;
+import org.junit.*;
+
+public class StudentsTest {
+
+    @Test
+    public void testInitializationSetupStudents() {
+        Students students = Students.getInstance();
+        Person[] studentArray = students.getArray();
+
+        int actual = studentArray.length;
+        int expected = 39;
+
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testSingletonInstance() {
+        Students expected = Students.getInstance();
+        Students actual = Students.getInstance();
+
+        Assert.assertSame(expected, actual);
+    }
+
+}

src/test/java/io/zipcoder/interfaces/TestPerson.java

@@ -1,5 +1,29 @@
 package io.zipcoder.interfaces;
 
+import org.junit.*;
+
 public class TestPerson {
 
+    @Test
+    public void testConstructor(){
+        //Given
+        long expected = 1;
+        //When
+        Person person = new Person(1);
+        long actual = person.getId();
+        //Then
+        Assert.assertEquals(expected,actual);
+    }
+    @Test
+    public void testName(){
+        //Given
+        String expected = "Jawnny";
+        //When
+        Person person = new Person(1);
+        person.setName("Jawnny");
+        String actual = person.getName();
+        //Then
+        Assert.assertEquals(expected,actual);
+    }
+
 }

src/test/java/io/zipcoder/interfaces/TestStudent.java

@@ -0,0 +1,38 @@
+package io.zipcoder.interfaces;
+
+import org.junit.*;
+
+public class TestStudent {
+
+
+    @Test
+    public void testImplementation(){
+        //Given
+        Student student = new Student(1);
+        //When
+        Boolean actual = student instanceof Learner;
+        //Then
+        Assert.assertTrue(actual);
+    }
+    @Test
+    public void testInheritence(){
+        //Given
+        Student student = new Student(1);
+        //When
+        Boolean actual = student instanceof Learner;
+        //Then
+        Assert.assertTrue(actual);
+    }
+    @Test
+    public void testTeach(){
+        //Given
+        double expected = 25;
+        Student student = new Student(1);
+        //When
+        student.learn(25);
+        double actual = student.getTotalStudyTime();
+        //Then
+        Assert.assertEquals(expected,actual,0);
+    }
+
+}

src/test/java/io/zipcoder/interfaces/ZipCodeWilmingtonTest.java

@@ -0,0 +1,22 @@
+package io.zipcoder.interfaces;
+
+import org.junit.*;
+
+public class ZipCodeWilmingtonTest {
+
+    @Test
+    public void testHostLecture() {
+            ZipCodeWilmington zcw = ZipCodeWilmington.INSTANCE;
+            Student[] studentsArray = zcw.students.getArray();
+            Instructor[] instructorsArray = zcw.instructors.getArray();
+
+            double before = studentsArray[0].getTotalStudyTime();
+
+            zcw.hostLecture(instructorsArray[0], 400);
+               double after = studentsArray[0].getTotalStudyTime();
+                        Assert.assertTrue(after-before == 400);
+
+            }
+
+
+}