at part 9

interfaces-1.iml

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+<?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/Educator.java

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+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher {
+    ZAN(0,"Zan"), ISANNOYING(1, "is Annoying");
+
+    public double timeWorked;
+    public final Instructor instructor;
+
+    Educator(long id, String name) {
+        instructor = new Instructor(id, name);
+    }
+
+    public void teach(Learner learner, double numberOfHours) {
+        this.timeWorked += numberOfHours;
+        instructor.teach(learner,numberOfHours);
+    }
+
+    public void lecture(Learner[] learners, double numberOfHours) {
+        this.timeWorked += numberOfHours;
+        instructor.lecture(learners,numberOfHours);
+    }
+
+    public double getTimeWorked(){
+        return timeWorked;
+    }
+}

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

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+package io.zipcoder.interfaces;
+
+public class Instructor extends Person implements Teacher {
+
+    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){
+        double numberOfHoursPerLearner = numberOfHours / learners.length;
+
+        for (int i = 0; i < learners.length; i++) {
+            learners[i].learn(numberOfHoursPerLearner);
+        }
+    }
+
+
+}

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

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+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+
+public final class Instructors extends People<Instructor>{
+
+    private static final Instructors INSTANCE = new Instructors();
+
+    private Instructors(){
+        ArrayList<String> instructorZan = new ArrayList<String>();
+        instructorZan.add(0,"ZANN");
+        instructorZan.add(1,"isAnnoying");
+
+        for (int i = 0; i < instructorZan.size(); i++) {
+            super.add(new Instructor(i,instructorZan.get(i)));
+        }
+    }
+
+    public Instructor[] toArray() {
+        return personList.toArray(new Instructor[personList.size()]);
+    }
+
+    public static Instructors getInstance(){
+        if(INSTANCE != null){
+            return INSTANCE;
+        }
+        else{
+            return INSTANCE;
+        }
+    }
+
+}

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

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