passed all tests

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_11">
+    <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

@@ -5,6 +5,18 @@
   <groupId>io.zipcoder</groupId>
   <artifactId>interfaces-1</artifactId>
   <version>0.0.1-SNAPSHOT</version>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>11</source>
+          <target>11</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
   <packaging>jar</packaging>
 
   <name>interfaces-1</name>

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

@@ -0,0 +1,35 @@
+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher {
+    LEON (new Instructor(0, "Leon")),
+    DOLIO(new Instructor(1,"Dolio")),
+    KRIS(new Instructor(2,"Kris"));
+
+    private final Instructor instructor;
+    private Double timeWorked;
+
+    Educator(Instructor instructor) {
+        this.instructor = instructor;
+        Instructors.getInstance().add(instructor);
+    }
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        instructor.teach(learner,numberOfHours);
+        setTimeWorked(numberOfHours);
+    }
+
+    @Override
+    public void lecture(Learner[] learners, Double numberOfHours) {
+        instructor.lecture(learners,numberOfHours);
+        setTimeWorked(numberOfHours);
+    }
+
+    public void setTimeWorked(Double timeWorked) {
+        this.timeWorked = timeWorked;
+    }
+
+    public Double getTimeWorked() {
+        return timeWorked;
+    }
+}

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

@@ -0,0 +1,37 @@
+package io.zipcoder.interfaces;
+
+/**
+ * Create an Instructor class such that:
+ * Instructor is a subclass of Person
+ * Instructor implements the Teacher interface
+ *
+ * Instructor should have a concrete implementation of the teach method
+ * which invokes the learn method on the specified Learner object.
+ *
+ * Instructor should have a concrete implementation of the lecture method
+ * which invokes the learn method on each of the elements in the specified array of Learner objects.
+ *
+ * numberOfHours should be evenly split amongst the learners.
+ * double numberOfHoursPerLearner = numberOfHours / learners.length;
+ */
+
+public class Instructor extends Person implements Teacher {
+
+    public Instructor(long id, String name) {
+        super(id, name);
+    }
+
+
+    @Override
+    public void teach(Learner learner, Double numberOfHours) {
+        learner.learn(numberOfHours);
+    }
+
+    @Override
+    public void lecture(Learner[] learners, Double numberOfHours) {
+        Double numberOfHoursPerLearner = numberOfHours/ learners.length;
+        for(Learner learner: learners){
+            learner.learn(numberOfHoursPerLearner);
+        }
+    }
+}

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

@@ -0,0 +1,20 @@
+package io.zipcoder.interfaces;
+
+import java.util.Arrays;
+
+public final class Instructors extends People<Instructor> {
+    private final static Instructors INSTANCE = new Instructors();
+    private Instructors(){
+        Instructor leon = new Instructor(0,"Leon");
+        Instructor dolio = new Instructor(1,"Dolio");
+        Instructor kris = new Instructor(2, "Kris");
+        Arrays.asList(leon, dolio, kris).forEach(this::add);
+    }
+
+    @Override
+    public Instructor[] toArray() {
+        return INSTANCE.getPersonList().toArray(new Instructor[0]);
+    }
+
+    public static Instructors getInstance(){return INSTANCE;}
+}

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

@@ -0,0 +1,6 @@
+package io.zipcoder.interfaces;
+
+public interface Learner {
+    void learn(Double numberOfHours);
+    Double getTotalStudyTime();
+}

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

@@ -0,0 +1,86 @@
+package io.zipcoder.interfaces;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Create a People class.
+ * The class should instantiate a List field of Person objects named personList.
+ * The class should define a method named add which adds a Person to the personList.
+ * The class should define a method named findById which makes use of a long id parameter 
+ * to return a Person object with the respective id field.
+ * The class should define a method named contains which makes use of a Person person parameter to
+ * return true if the personList contains the respective Person object.
+ * The class should define a method named remove which makes use of a Person person parameter 
+ * to remove a respective Person object.
+ * The class should define a method named remove which makes use of a long id parameter to 
+ * remove a Person object with the respective id field.
+ * The class should define a named removeAll which clears our personList field.
+ * The class should define a method named count which returns the size of personList.
+ * The class should define a method named toArray which returns an array representation of the 
+ * personList field.
+ *
+ * The class should implement Iterable<E> and define a method named iterator which makes use of 
+ * the personList field to generate a new a Iterator<E>.
+ * 
+ */
+public abstract class People<PersonType extends Person> implements Iterable<PersonType> {
+    private List<PersonType> personList;
+
+    public People() {
+        this.personList = new ArrayList<PersonType>();
+    }
+
+    public void add(PersonType person){
+        personList.add(person);
+    }
+
+    public PersonType findById(long id){
+        for(PersonType person:personList){
+            if(person.getId() == id){
+                return person;
+            }
+        }
+        return null;
+    }
+
+    public boolean contains(PersonType person){
+        if(personList.contains(person)){
+            return true;
+        }
+        return false;
+    }
+
+    //Should only remove - not return a string
+    public void removePerson(PersonType person){
+        if(personList.contains(person)){
+            personList.remove(person);
+        } else {
+            throw new UnsupportedOperationException("That person is not here");
+        }
+    }
+
+    public void removeById(long id){
+        personList.removeIf(person -> person.getId() == id);
+    }
+
+    public void removeAll(){
+        personList.clear();
+    }
+
+    public Integer count(){
+        return personList.size();
+    }
+
+    public abstract PersonType[] toArray();
+
+    @Override
+    public Iterator iterator() {
+        return personList.iterator();
+    }
+
+    public List<PersonType> getPersonList() {
+        return personList;
+    }
+}

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

@@ -2,4 +2,23 @@
 
 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 +1,26 @@
+package io.zipcoder.interfaces;
+
+public class Student extends Person implements Learner{
+    private long id;
+    private String name;
+    private Double totalStudyTime;
+
+    public Student(long id, String name) {
+        super(id, name);
+    }
+
+    public Student() {
+        super(0,"");
+    }
+
+    @Override
+    public void learn(Double numberOfHours) {
+        this.totalStudyTime = numberOfHours;
+    }
+
+    @Override
+    public Double getTotalStudyTime() {
+        return this.totalStudyTime;
+    }
+
+}