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+</project>

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_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

@@ -0,0 +1,23 @@
+package io.zipcoder.interfaces;
+
+public class Instructor extends Person implements Teacher  {
+    public Instructor(long ID) {
+        super(ID);
+    }
+
+    public void teach(Learner learner, double numberOfHours) {
+
+        learner.learn(numberOfHours);
+
+    }
+
+    public void lecture(Learner[] learners, double numberOfHours) {
+
+
+        for(int i=0; i<learners.length; i++)
+        {
+           learners[i].learn(numberOfHours/learners.length);
+        }
+
+    }
+}

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

@@ -0,0 +1,7 @@
+package io.zipcoder.interfaces;
+
+public interface Learner {
+
+    void learn(double numberOfHours);
+
+}

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

@@ -2,4 +2,24 @@ package io.zipcoder.interfaces;
 
 public class Person {
 
+    final long ID;
+    String 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

@@ -0,0 +1,22 @@
+package io.zipcoder.interfaces;
+
+public class Student extends Person implements Learner {
+
+
+    double totalStudyTime=0;
+
+    public Student(long ID) {
+        super(ID);
+    }
+
+    public void learn(double numberOfHours) {
+
+        totalStudyTime +=numberOfHours;
+
+    }
+
+    public double getTotalStudyTime() {
+
+        return totalStudyTime;
+    }
+}

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

@@ -0,0 +1,7 @@
+package io.zipcoder.interfaces;
+
+public interface Teacher {
+
+    void teach(Learner learner, double numberOfHours);
+    void lecture(Learner[] learners, double numberOfHours);
+}

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

@@ -0,0 +1,45 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class InstructorTest {
+
+    @Test
+    public void testImplementation()
+    {
+        Instructor instructor = new Instructor(2);
+        Assert.assertTrue(instructor instanceof Teacher);
+    }
+
+    @Test
+    public void testInheritance()
+    {
+        Instructor instructor = new Instructor(3);
+        Assert.assertTrue(instructor instanceof Person);
+    }
+
+    @Test
+    public void testTeach()
+    {
+        Instructor instructor = new Instructor(3);
+        double newHours = 5;
+        Learner l = new Student(2);
+        instructor.teach(l,newHours);
+        double actual = ((Student) l).getTotalStudyTime();
+        double expected = 5;
+        Assert.assertEquals(expected,actual,1);
+    }
+
+    @Test
+    public void testLecture()
+    {
+    Instructor instructor = new Instructor(1);
+    Student student = new Student(1);
+    Student[] arrayStudent = {student};
+    instructor.lecture(arrayStudent,4);
+    double expected =4;
+    double actual = student.getTotalStudyTime();
+    Assert.assertEquals(expected,actual,1);
+    }
+}

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

@@ -0,0 +1,35 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import static org.hamcrest.core.IsInstanceOf.instanceOf;
+
+public class StudentTest {
+
+    @Test
+    public void testImplementation()
+    {
+    Student student = new Student(1);
+    Assert.assertTrue(student instanceof  Person);
+    }
+
+    @Test
+    public void testInterface()
+    {
+        Student student = new Student(1);
+        Assert.assertTrue(student instanceof Learner);
+    }
+    @Test
+    public void testLearn()
+    {
+        Student student = new Student(1);
+
+        student.learn(3);
+        double actual = student.getTotalStudyTime();
+        double expected =3;
+        Assert.assertEquals(expected,actual,1);
+    }
+
+
+}

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

@@ -0,0 +1,7 @@
+package io.zipcoder.interfaces;
+
+import org.junit.Test;
+
+public class TestPeople {
+
+}

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

@@ -1,5 +1,35 @@
 package io.zipcoder.interfaces;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class TestPerson {
 
+    @Test
+    public void personTest()
+    {
+        Person person = new Person(1);
+        Assert.assertNotNull(person);
+    }
+
+
+    @Test
+    public void getIdTest()
+    {
+        Person person = new Person(2);
+        long expected = 2;
+        long actual = person.getID();
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void getNameTest()
+    {
+        Person person = new Person(3);
+        String expected = "jose";
+        person.setName(expected);
+        String actual = person.getName();
+        Assert.assertEquals(expected,actual);
+    }
+
 }