finished 6 parts

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+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="532">
+          <caret line="75" selection-start-line="75" selection-end-line="75" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/PeopleTest.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="532">
+          <caret line="163" column="43" selection-start-line="163" selection-start-column="43" selection-end-line="163" selection-end-column="43" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Student.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="285">
+          <caret line="19" column="30" selection-start-line="19" selection-start-column="30" selection-end-line="19" selection-end-column="30" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/io/zipcoder/interfaces/StudentTest.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="442">
+          <caret line="51" column="5" selection-start-line="51" selection-start-column="5" selection-end-line="51" selection-end-column="5" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/People.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="419">
+          <caret line="65" column="29" selection-start-line="65" selection-start-column="29" selection-end-line="65" selection-end-column="29" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Learner.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="60">
+          <caret line="4" column="44" selection-start-line="4" selection-start-column="44" selection-end-line="4" selection-end-column="44" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/io/zipcoder/interfaces/Instructor.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="270">
+          <caret line="18" column="65" selection-start-line="18" selection-start-column="65" selection-end-line="18" selection-end-column="65" />
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ArtifactsStructureConfigurable.UI">
+        <settings>
+          <artifact-editor />
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="FacetStructureConfigurable.UI">
+        <settings>
+          <last-edited>No facets are configured</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <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="ModuleStructureConfigurable.UI">
+        <settings>
+          <last-edited>interfaces-1</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+                <option value="0.6" />
+              </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

@@ -1,10 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager">
-    <output url="file://$MODULE_DIR$/bin" />
-    <exclude-output />
-    <content url="file://$MODULE_DIR$" />
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_7">
+    <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

@@ -5,6 +5,18 @@
   <groupId>io.zipcoder</groupId>
   <artifactId>interfaces-1</artifactId>
   <version>0.0.1-SNAPSHOT</version>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>7</source>
+          <target>7</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
   <packaging>jar</packaging>
 
   <name>interfaces-1</name>

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

@@ -1,4 +1,28 @@
 package io.zipcoder.interfaces;
 
-public class Instructor {
+public class Instructor extends Person implements Teacher {
+
+
+    public Instructor(int objectId) {
+
+        super(objectId);
+    }
+
+    public void teach(Learner learner, double numberOfHours) {
+
+        learner.learn(numberOfHours);
+
+    }
+
+    public void lecture(Learner[] learners, double numberOfHours) {
+
+        double numberOfHoursPerLearner = numberOfHours / learners.length;
+
+        for (Learner learner : learners){
+
+            learner.learn(numberOfHoursPerLearner);
+        }
+
+
+    }
 }

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

@@ -1,4 +1,6 @@
 package io.zipcoder.interfaces;
 
 public interface Learner {
+
+    public void learn(double numberOfHours);
 }

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

@@ -0,0 +1,70 @@
+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Stack;
+
+public class People {
+
+    List<Person> personList = new ArrayList<>();
+
+    public void add(Person person1) {
+
+        personList.add(person1);
+
+    }
+
+    public int getSize() {
+
+        return personList.size();
+    }
+
+
+    public boolean remove(Person person1) {
+
+        return personList.remove(person1);
+    }
+
+    public void remove(long i) {
+
+        Person personToRemove = null;
+
+        for (Person person : personList) {
+
+            if (person.getId() == i) {
+
+                personToRemove = person;
+
+            }
+
+        }
+        personList.remove(personToRemove);
+
+    }
+
+    public Person findById(long i) {
+
+        Person personToCapture = null;
+
+        for (Person person : personList) {
+
+            if (person.getId() == i) {
+
+                personToCapture = person;
+
+            }
+
+        }
+        return personToCapture;
+    }
+
+    public Object[] getArray() {
+
+        return personList.toArray();
+    }
+
+    public boolean removeAll() {
+
+        return personList.removeAll(personList);
+    }
+}

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

@@ -2,4 +2,26 @@ package io.zipcoder.interfaces;
 
 public class Person {
 
+    private long id;
+
+    private String name;
+
+    public Person(int objectId) {
+
+        this.id = objectId;
+
+    }
+
+    public long getId() {
+
+        return this.id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
 }

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

@@ -1,4 +1,22 @@
 package io.zipcoder.interfaces;
 
-public class Student {
+public class Student extends Person implements Learner{
+
+    private double totalStudytime;
+
+    public Student(int objectId) {
+
+        super(objectId);
+    }
+
+    public void learn(double numberOfHours) {
+
+        totalStudytime += numberOfHours;
+
+    }
+
+    public double getTotalStudyTime() {
+
+        return totalStudytime;
+    }
 }

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

@@ -1,4 +1,8 @@
 package io.zipcoder.interfaces;
 
 public interface Teacher {
+
+    public void teach(Learner learner, double numberOfHours);
+
+    public void lecture(Learner[] learner,double numberOfHours);
 }

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

@@ -1,4 +1,77 @@
 package io.zipcoder.interfaces;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class InstructorTest {
+
+    @Test
+    public void testImplementation() {
+
+        //Given
+        Instructor instructor = new Instructor (5);
+
+
+
+        //Then
+        Assert.assertTrue(instructor instanceof Teacher);
+    }
+
+    @Test
+    public void testInheritance() {
+        //Given
+        Person instructor = new Instructor (5);
+
+        //Then
+        Assert.assertTrue(instructor instanceof Person);
+
+    }
+
+    @Test
+    public void testTeach() {
+        //Given
+        Student student = new Student(5);
+
+        Instructor instructor = new Instructor (5);
+
+
+        double expected = 5.0;
+
+        student.learn(5.0);
+
+        //Then
+        double actual = student.getTotalStudyTime();
+
+        //When
+        Assert.assertEquals(expected, actual, 0);
+
+
+    }
+
+    @Test
+    public void testLecture() {
+
+        //Given
+        Student student1 = new Student(1);
+        Student student2 = new Student(2);
+        Student student3 = new Student(3);
+        Student student4 = new Student(4);
+        Student student5 = new Student(5);
+
+        Student[] students = {student1,student2,student3,student4,student5};
+
+        Instructor instructor = new Instructor(5);
+
+        double expected = 2;
+
+        //When
+        instructor.lecture(students,10);
+
+        double actual = students[0].getTotalStudyTime();
+        //Then
+
+        Assert.assertEquals(expected,actual,0);
+    }
+
+
 }

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

@@ -0,0 +1,168 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class PeopleTest {
+
+    private People people;
+    private Person person1;
+    private Person person2;
+    private Person person3;
+    private Person person4;
+
+
+    @Before
+    public void setup() {
+        people = new People();
+        person1 = new Person(5);
+        person2 = new Person(4);
+        person3 = new Person(3);
+        person4 = new Person(2);
+
+
+    }
+
+    @Test
+    public void testAdd() {
+
+        //Given
+
+        int expected = 1;
+
+        //When
+        people.add(person1);
+
+        int actual = people.getSize();
+
+
+        //Then
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testRemoveByPerson() {
+
+        //Given
+        people.add(person1);
+        people.add(person2);
+        people.add(person3);
+        people.add(person4);
+
+        //When
+        Assert.assertTrue(people.remove(person1));
+
+        //Then
+
+
+    }
+
+    @Test
+    public void testRemovePersonChangeSize() {
+
+        //Given
+        people.add(person1);
+        people.add(person2);
+        people.add(person3);
+        people.add(person4);
+
+        //When
+        people.remove(person1);
+
+        int expected = 3;
+
+        int actual = people.getSize();
+
+        //Then
+        Assert.assertEquals(expected, actual);
+
+
+    }
+
+    @Test
+    public void testRemovePersonById() {
+
+        //Given
+        people.add(person1);
+        people.add(person2);
+        people.add(person3);
+        people.add(person4);
+
+        //When
+        people.remove(5);
+
+        int expected = 3;
+
+        int actual = people.getSize();
+
+        //Then
+        Assert.assertEquals(expected, actual);
+
+
+    }
+
+    @Test
+    public void testFindById() {
+
+        //Given
+        people.add(person1);
+        people.add(person2);
+        people.add(person3);
+        people.add(person4);
+
+        //When
+        Person expected = person1;
+
+        Person actual = people.findById(5);
+
+        //Then
+        Assert.assertEquals(expected, actual);
+
+
+
+    }
+
+    @Test
+    public void testGetArray() {
+
+        //Given
+        people.add(person1);
+        people.add(person2);
+        people.add(person3);
+        people.add(person4);
+
+        //When
+        Object[]expected ={person1,person2,person3,person4};
+
+        Object[] actual = people.getArray();
+
+        //Then
+        Assert.assertArrayEquals(expected, actual);
+    }
+
+    @Test
+    public void testRemoveAll() {
+
+        //Given
+        people.add(person1);
+        people.add(person2);
+        people.add(person3);
+        people.add(person4);
+
+        //When
+        Object[]expected ={person1,person2,person3,person4};
+
+        Object[] actual = people.getArray();
+
+        //Then
+        Assert.assertTrue(people.removeAll());
+    }
+}
+
+

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

@@ -1,5 +1,53 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
 import static org.junit.Assert.*;
 
 public class StudentTest {
 
-}
+    @Test
+    public void testImplementation() {
+
+        //Given
+        Student student = new Student(5);
+
+
+
+        //Then
+        Assert.assertTrue(student instanceof Learner);
+    }
+
+    @Test
+    public void testInheritance() {
+        //Given
+        Person student = new Student(5);
+
+        //Then
+        Assert.assertTrue(student instanceof Person);
+
+    }
+
+    @Test
+    public void testLearn() {
+        //Given
+        Student student = new Student(5);
+
+        double expected = 4.5;
+
+        student.learn(4.5);
+
+        //Then
+        double actual = student.getTotalStudyTime();
+
+        //When
+        Assert.assertEquals(expected, actual, 0);
+
+
+    }
+
+
+
+    }
+

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

@@ -1,5 +1,40 @@
 package io.zipcoder.interfaces;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class TestPerson {
 
+    @Test
+    public void testConstructor() {
+
+        //Given
+        Person person = new Person( 5);
+
+        long expected = 5;
+
+        //When
+        long actual = person.getId();
+
+        //Then
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testSetAndGetName() {
+        //Given
+        Person person = new Person(5);
+
+        person.setName("Xzavia");
+
+        String expected = "Xzavia";
+
+        //When
+
+        String actual = person.getName();
+
+        //Then
+        Assert.assertEquals(expected,actual);
+    }
+
 }