Finally learned lab :)

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_8">
+    <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

@@ -5,7 +5,19 @@
   <groupId>io.zipcoder</groupId>
   <artifactId>interfaces-1</artifactId>
   <version>0.0.1-SNAPSHOT</version>
-  <packaging>jar</packaging>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <packaging>jar</packaging>
 
   <name>interfaces-1</name>
   <url>http://maven.apache.org</url>

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

@@ -0,0 +1,28 @@
+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher{
+    DOLIO(Instructors.getInstance().findById(101L)),
+    LEON(Instructors.getInstance().findById(102L)),
+    KRIS(Instructors.getInstance().findById(103L));
+
+    Instructor instructor;
+    Double timeWorked = 0.0;
+
+    Educator(Instructor instructor) {
+        this.instructor = instructor;
+    }
+
+    @Override
+    public void teach(Learner learner, double numberOfHours) {
+        this.instructor.teach(learner, numberOfHours);
+        this.timeWorked += numberOfHours;
+    }
+
+    @Override
+    public void lecture(Learner[] learners, double numberOfHours) {
+        this.instructor.lecture(learners, numberOfHours);
+        this.timeWorked += numberOfHours;
+    }
+
+
+}

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

@@ -0,0 +1,21 @@
+package io.zipcoder.interfaces;
+
+public class Instructor extends Person implements Teacher{
+
+    Instructor(Long id, String name) { //default person. super cuz instructor is subclass
+        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 (Learner studentLearners : learners){    // for each Learner in array learners
+            studentLearners.learn(numberOfHoursPerLearner); //each learner can learn in
+                                                            //divided hours by each student
+                                                            //in learners array.
+        }
+    }
+}

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

@@ -0,0 +1,23 @@
+package io.zipcoder.interfaces;
+
+public final class Instructors extends People<Instructor>{
+
+    public static final Instructors INSTANCE = new Instructors();
+
+    private Instructors() {
+        this.add(new Instructor (101L, "Dolio"));
+        this.add(new Instructor (102L, "Leon"));
+        this.add(new Instructor (103L, "Kris"));
+
+    }
+
+    public static Instructors getInstance(){
+        return INSTANCE;
+    }
+
+    public Instructor[] toArray(){
+         return elementList.toArray(new Instructor[0]);
+        }
+
+
+}

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

@@ -0,0 +1,10 @@
+package io.zipcoder.interfaces;
+
+public interface Learner {
+
+    public void learn(double numberOfHours);
+
+    public Double getTotalStudyTime();
+
+}
+