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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Person.java">
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+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Teacher.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          <caret line="10" lean-forward="true" selection-start-line="10" selection-end-line="10" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Students.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="653">
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Instructor.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/ZipcodeWilmington.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          <caret line="15" selection-start-line="15" selection-end-line="15" />
+        </state>
+      </provider>
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+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestInstructor.java">
+      <provider selected="true" editor-type-id="text-editor">
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+            <element signature="method#testTeach#0;class#TestInstructor#0" />
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestInstructors.java">
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestPerson.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="315">
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+          <folding>
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+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestStudent.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="195">
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestStudents.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="270">
+          <caret line="18" column="25" selection-start-line="18" selection-start-column="25" selection-end-line="18" selection-end-column="25" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestZipCodeWilmington.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="345">
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+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/TestPeople.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/README.md">
+      <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
+        <state split_layout="SECOND">
+          <first_editor />
+          <second_editor />
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="GlobalLibrariesConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="JdkListConfigurable.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectLibrariesConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>

interfaces-1.iml

+<?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/Instructor.java

+package io.zipcoder.interfaces;
+
+public class Instructor extends Person implements Teacher {
+
+    public Instructor (String name,long id) {
+        super(name,id);
+    }
+
+    public Instructor(long id) {
+        super(id);
+    }
+
+    public void teach(Learner learner, double numOfHrs) {
+        learner.learn(numOfHrs);
+
+    }
+
+    public void lecture(Student[] students1, double numOfHrs) {
+
+    }
+
+    public void Lecture(Learner[] learners, double numOfHrs) {
+        double numOfHrsPerLearner = numOfHrs/learners.length;
+
+        for(Learner learner : learners){
+            learner.learn(numOfHrsPerLearner);
+        }
+    }
+}

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

+package io.zipcoder.interfaces;
+
+public class Instructors extends People <Instructor> {
+    private static Instructors ourInstance = new Instructors();
+
+    public static Instructors getInstance() {
+        return ourInstance;
+    }
+
+    private Instructors() {
+        personList.add(new Instructor("Wil", 2));
+        personList.add(new Instructor("Dolio", 4));
+        personList.add(new Instructor("Kris", 7));
+        personList.add(new Instructor("Nhu", 8));
+    }
+
+    @Override
+    public Instructor[] getArray() {
+        Instructor[] instructor = new Instructor[personList.size()];
+        for (int i = 0; i < personList.size(); i++)
+            instructor[i] = personList.get(i);
+            return instructor;
+
+    }
+}

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

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

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

+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+
+public abstract class People <E extends Person> {
+
+    ArrayList<E> personList = new ArrayList<E>();
+
+    public void add(E p) {
+        personList.add(p);
+        //or  this.personList.add(p);
+    }
+
+
+    public E findById (long id){
+        E personToFind = null;// Remove null
+        for(int i = 0; i < personList.size();i++){
+            if(personList.get(i).getId() == id){
+                personToFind = personList.get(i);
+            } }
+           return personToFind;
+    }
+
+    public void removeById (long id){
+        for (E p : personList){
+            if (p.getId() == id){
+                personList.remove(p);
+                break;
+            }
+        }
+    }
+
+    public boolean removeAll(){
+        ArrayList <E> array = new ArrayList<E>();
+        return personList.removeAll(array);
+
+    }
+
+    public int getCount(){
+
+        return personList.size();
+    }
+
+    public abstract E[] getArray();
+
+}

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

 
 public class Person {
 
+    public final long id;
+    public String name;
+
+    //have two constructor but cannot call both of them at same time when creating object
+
+    public Person(){
+        id = 0;
+    }
+
+    public Person (String name, long id){
+        this.id = id;
+        this.name = name;
+    }
+
+    public Person(long id){
+
+        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

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

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

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

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

+package io.zipcoder.interfaces;
+
+public interface Teacher {
+
+    public void teach(Learner learner, double numOfHrs);
+
+    public void Lecture(Learner[] learners, double numOfHrs);
+
+    public void lecture(Student[] students1, double numOfHrs);
+}

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

+package io.zipcoder.interfaces;
+
+import com.sun.org.apache.bcel.internal.generic.INSTANCEOF;
+
+public class ZipcodeWilmington {
+    private static final ZipcodeWilmington INSTANCE = new ZipcodeWilmington();
+    private static final Students students = Students.getInstance();
+    private static final Instructors instructors = Instructors.getInstance();
+
+
+    public static ZipcodeWilmington getInstance() {
+        return INSTANCE;
+    }
+
+    private ZipcodeWilmington() {}
+
+    public void hostLecture (Teacher teacher,double numOfHrs){
+        Student[] students1 = students.getArray();
+        teacher.Lecture(students1,numOfHrs);
+    }
+
+    public void hostLecture (long id,double numOfHrs){
+        Student[] students1 = students.getArray();
+        for (int i = 0; i < instructors.getCount(); i++){
+            if (instructors.personList.get(i).getId() == id){
+                instructors.personList.get(i).Lecture(students1,numOfHrs);
+            }
+        }
+    }
+
+    public static Students getStudents(){
+        return students;
+    }
+
+    public static Instructors getInstructors(){
+        return instructors;
+    }
+}

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

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructor {
+
+    Instructor instructor = new Instructor("Nhu", 1);
+    Student student = new Student( "Nancy", 1);
+    Student student1= new Student( "Ron", 2);
+    Student student2= new Student( "Ari", 3);
+    Student student3= new Student("Rita",4);
+
+    Student [] students = new Student[] {student,student1,student2,student3};
+
+
+    @Test
+    public void testImplementation(){
+        Assert.assertTrue(instructor instanceof Teacher);
+    }
+
+    @Test
+    public void testInheritance(){
+        Assert.assertTrue(instructor instanceof Person);
+    }
+
+    @Test
+    public void testTeach(){
+        student.setTotalStudyTime(2.0);
+        instructor.teach(student,50.0);
+
+        double expected = 52.0;
+
+       /* double actual = student.getTotalStudyTime();
+        Assert.assertEquals(expected,actual,0.0);*/
+
+        Assert.assertEquals(expected, student.getTotalStudyTime(), 0.0);
+    }
+
+    @Test
+    public void testLecture(){
+
+        double numOfHrs = 50.0;
+
+        instructor.lecture(students, 50.0);
+        double expected = students[0].getTotalStudyTime();
+
+       double actual = 12.5; // numOfHrs instructor taught / # of students taught so 50/4 = 12.5
+
+
+        Assert.assertEquals(expected, actual, 0.01);
+    }
+}

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

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructors {
+
+    @Test
+    public void getInstance(){
+        Instructors instructors1 = Instructors.getInstance();
+        Instructors instructors2 = Instructors.getInstance();
+
+        Assert.assertEquals(instructors1,instructors2);
+    }
+
+    @Test
+    public void theInitializationSetupStudents(){
+        Instructors instructors1 = Instructors.getInstance();
+        int expected = 4;
+        int actual = instructors1.getArray().length;
+        Assert.assertEquals(expected,actual);
+
+    }
+}

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

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestPeople {
+
+    Person person1,person2;
+    Student student1;
+    Instructor instructor;
+    Students students;
+    Instructors instructors;
+
+    public TestPeople() {
+        students = Students.getInstance();
+        person1 = new Person("person1", 45);
+        person2 = new Person("person2", 55);
+        student1 = new Student("student1", 50);
+        instructor = new Instructor("instructor1", 54);
+        students.add(student1);
+    }
+
+    @Test
+    public void testAdd(){
+        //Given
+        Student newStudent = new Student("student2", 42);
+
+        //When
+        Integer expected = 41;
+        students.add(newStudent);
+        Integer actual = students.getCount();
+
+        //Then
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testFindById(){
+        //When
+        long expected = student1.getId();
+        Student actual = students.findById(50);
+
+        //Then
+        Assert.assertEquals(expected,actual.getId());
+    }
+
+    @Test
+    public void testRemoveTest(){
+        //When
+        Integer expected = 42;
+        students.removeById(50);
+        Integer actual = students.getCount();
+
+        //Then
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testRemoveAll(){
+        //Given
+        Instructors instructors = Instructors.getInstance();
+
+        //When
+        Integer expected = 4;
+        instructors.removeAll();
+        Integer actual = instructors.getCount();
+
+        //Then
+        Assert.assertEquals(expected,actual);
+
+    }
+
+
+
+}

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

 package io.zipcoder.interfaces;
 
+import org.junit.Assert;
+import org.junit.Test;
+
+
 public class TestPerson {
 
+    Person person = new Person("Nancy",1 );
+
+    @Test
+    public void testConstructor() {
+        long expected = 1;
+        long actual = person.getId();
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testSetAndGetName() {
+
+        String expected = "Nancy";
+        person.setName(expected);
+
+        Assert.assertEquals(expected, person.getName());
+
+    }
 }

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

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestStudent {
+    Student student = new Student("Nancy",1);  //creating global new object
+
+    @Test
+    public void testImplementation() {
+/*
+        //Given
+        boolean expected = true;
+
+        //When
+        boolean actual = student instanceof Learner;
+
+        //Then
+        Assert.assertEquals(expected, actual);*/
+
+        Assert.assertTrue(student instanceof Learner);
+
+    }
+
+    @Test
+    public void testInheritance (){
+
+    Assert.assertTrue(student instanceof Person);
+    }
+
+    @Test
+    public void testLearn(){
+
+        //Given
+
+        double numOfHrs = 10.0;
+        double expected = 10.0;
+
+        //When
+        student.learn(numOfHrs);
+
+        //Then
+        Assert.assertEquals(expected,student.getTotalStudyTime(), 0.0);
+    }
+}
+

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

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestStudents {
+
+    @Test
+    public void getInstance(){
+        Students student =  Students.getInstance();
+        Students student1 =  Students.getInstance();
+
+        Assert.assertEquals(student,student1);
+    }
+
+    @Test
+    public void theInitializationSetupStudents(){
+        Students student = Students.getInstance();
+        int expected = 43;
+        int actual = student.getArray().length;
+        Assert.assertEquals(expected,actual);
+    }
+}

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

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestZipCodeWilmington {
+
+    @Test
+    public void hostLecture(){
+        ZipcodeWilmington zcw = ZipcodeWilmington.getInstance();
+        Instructor instructor = zcw.getInstructors().getArray()[0];
+        zcw.hostLecture(instructor, 39);
+        double expected = 2;
+        double actual = zcw.getStudents().getArray()[0].getTotalStudyTime();
+
+        Assert.assertEquals(expected,actual, .1);
+        }
+
+    @Test
+    public void hostLectureById(){
+        ZipcodeWilmington zcw = ZipcodeWilmington.getInstance();
+        Instructor instructor = zcw.getInstructors().getArray()[0];
+        zcw.hostLecture(instructor.getId(),39);
+        double expected = 1;
+        double actual = zcw.getStudents().getArray()[0].getTotalStudyTime();
+
+        Assert.assertEquals(expected,actual,.1);
+
+    }
+}