Completed part 5.0

.idea/workspace.xml

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

+package io.zipcoder.interfaces;
+
+public class Instructor extends Person implements Teacher {
+
+    public Instructor(long id, String name) {
+        super(id, name);
+    }
+
+    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/Teacher.java

+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/TestInstructor.java

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestInstructor {
+
+    @Test
+    public void testImplementation(){
+        Instructor instructor = new Instructor(54, "Mr.Bean");
+        Assert.assertTrue(instructor instanceof Person);
+    }
+
+    @Test
+    public void testInheritance(){
+        Instructor instructor = new Instructor(54, "Mr.Bean");
+        Assert.assertTrue(instructor instanceof Teacher);
+    }
+
+    @Test
+    public void testTeach(){
+        Instructor instructor = new Instructor(54, "Mr.Bean");
+        Student student = new Student(1, "William");
+
+        instructor.teach(student, 2);
+
+        double expected = 2;
+        double actual = student.totalStudyTime;
+
+        Assert.assertEquals(expected, actual, 0);
+    }
+
+    @Test
+    public void testLecture(){
+        Instructor instructor = new Instructor(54, "Mr.Bean");
+        Student William = new Student(1, "William");
+        Student James = new Student(3, "James");
+
+        Learner[] learners = {William, James};
+
+        instructor.lecture(learners, 2);
+
+        double expected = 1;
+        double actualWilliam = William.totalStudyTime;
+        double actualJames = James.totalStudyTime;
+
+        Assert.assertEquals(expected, actualWilliam, 0);
+        Assert.assertEquals(expected, actualJames, 0);
+    }
+}