Dev

.gitignore

@@ -3,3 +3,4 @@
 .classpath
 #.project
 .settings
+*.idea/

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/Educator.java

@@ -0,0 +1,35 @@
+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher {
+    SAM,
+    NICK,
+    FRANK,
+    CHRIS;
+
+    private final Instructor instructor;
+    private Double timeWorked = 0.0;
+
+    Educator() {
+
+        this.instructor = new Instructor((long) ordinal(), name());
+
+    }
+
+
+    public Double timeWorked() {
+
+        return timeWorked;
+    }
+
+    public void teach(Learner learner, double numberOfHours) {
+
+        timeWorked += numberOfHours;
+        this.instructor.teach(learner, numberOfHours);
+    }
+
+    public void lecture(Learner[] learners, double numberOfHours) {
+
+        timeWorked += numberOfHours;
+        this.instructor.lecture(learners, numberOfHours);
+    }
+}

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

@@ -0,0 +1,26 @@
+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 hoursPerStudent = numberOfHours / learners.length;
+
+        for(Learner learner : learners)
+            learner.learn(hoursPerStudent);
+
+    }
+
+}
+

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

@@ -0,0 +1,29 @@
+package io.zipcoder.interfaces;
+
+public final class Instructors extends People<Instructor>{
+
+    private static final Instructors INSTANCE = new Instructors();
+
+    private Instructors(){
+
+        Instructor newInstructor1 = new Instructor(100L, "Rick");
+        Instructor newInstructor2 = new Instructor(110L, "Dana");
+        Instructor newInstructor3 = new Instructor(120L, "John");
+
+        super.add(newInstructor1);
+        super.add(newInstructor2);
+        super.add(newInstructor3);
+
+    }
+
+    public Instructor[] getArray() {
+        return super.personList.toArray(new Instructor[0]);
+    }
+
+    public static Instructors getInstance(){
+
+        return INSTANCE;
+    }
+
+}
+

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

@@ -0,0 +1,9 @@
+package io.zipcoder.interfaces;
+
+public interface Learner {
+
+    void learn(double numberOfHours);
+    double getTotalStudyTime();
+
+
+}

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

@@ -0,0 +1,60 @@
+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+public abstract class People<E extends Person> implements Iterable<E> {
+
+    List<E> personList;
+
+    public People(){
+
+        personList = new ArrayList<E>();
+
+    }
+
+    public void add(E person){
+
+        personList.add(person);
+    }
+
+    public E findById(long id){
+
+        for(E person : personList)
+            if(person.getId() == id)
+                return person;
+
+        return null;
+    }
+
+    public boolean contains(Person person){
+
+        return personList.contains(person);
+    }
+
+    public void removeByPerson(Person person){
+
+        personList.remove(person);
+    }
+
+    public void removeById(long id) {
+        personList.remove(findById(id));
+    }
+
+    public void removeAll(){
+
+        personList.clear();
+    }
+
+    public int count(){
+
+        return personList.size();
+    }
+
+    public abstract E[] getArray();
+
+    public Iterator<E> iterator() {
+        return personList.iterator();
+    }
+}

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

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+package io.zipcoder.interfaces;
+
+public class PeopleClass extends People<Person>{
+
+        public Person[] getArray() {
+            return personList.toArray(new Person[0]);
+
+        }
+}

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

@@ -2,4 +2,25 @@
 
 public class Person {
 
+    private final Long id;
+    private String name;
+
+    public Person(Long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    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 +1,19 @@
+package io.zipcoder.interfaces;
+
+public class Student extends Person implements Learner{
+
+    double totalStudyTime;
+
+    public Student(Long id, String name) {
+        super(id, name);
+    }
+
+    public void learn(double numberOfHours) {
+        totalStudyTime += numberOfHours;
+
+    }
+
+    public double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+}

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

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+package io.zipcoder.interfaces;
+
+public final class Students extends People<Student>{
+
+    private static final Students INSTANCE = new Students();
+
+    private Students(){
+
+        Student newStudent1 = new Student(10L, "Sam");
+        Student newStudent2 = new Student(20L, "Dan");
+
+        super.add(newStudent1);
+        super.add(newStudent2);
+
+    }
+
+    public Student[] getArray() {
+        return super.personList.toArray(new Student[0]);
+    }
+
+    public static Students getInstance(){
+        return INSTANCE;
+    }
+
+}

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

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