Finished finally...

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_14">
+    <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>14</source>
+          <target>14</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
   <packaging>jar</packaging>
 
   <name>interfaces-1</name>

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

@@ -0,0 +1,28 @@
+package io.zipcoder.interfaces;
+
+public enum Educator implements Teacher{
+    ORACLE,
+    DOLIO,
+    Kris;
+
+
+    private final Instructor instructor;
+    double timeWorked;
+
+      Educator() {
+        this.instructor = new Instructor((long) ordinal(), name());
+    }
+
+
+    @Override
+    public void teach(Learner learner, double numberOfHours) {
+        instructor.teach(learner, numberOfHours);
+
+    }
+
+    @Override
+    public void lecture(Learner[] learners, double numberOfHours) {
+        instructor.lecture(learners, numberOfHours);
+
+    }
+}

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

@@ -0,0 +1,24 @@
+package io.zipcoder.interfaces;
+
+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(int i =0; i <learners.length; i++){
+            learners[i].learn(numberOfHoursPerLearner);
+        }
+
+    }
+}

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

@@ -0,0 +1,21 @@
+package io.zipcoder.interfaces;
+
+public final class Instructors extends People<Instructor> {
+
+    private static final Instructors INSTANCE = new Instructors();
+
+    private Instructors(){
+        Instructor instructor = new Instructor(10l, "Oracle");
+        Instructor instructor1 = new Instructor(11l, "Rapper Dolio");
+        Instructor instructor2 = new Instructor(12l, "Kris");
+
+
+        personList.add(instructor);
+        personList.add(instructor1);
+        personList.add(instructor2);
+
+    }
+    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 +1,62 @@
+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 i : personList) {
+            Long acualId = i.getid();
+            if(acualId.equals(id)){
+                return i;
+            }
+        }
+        return null;
+    }
+
+    public boolean contains(E person){
+        return  personList.contains(person);
+    }
+
+    public void remove(E person){
+        personList.remove(person);
+    }
+
+    public void removeId(long id){
+        for(Person i : personList){
+            if(i.getid() == id){
+                remove((E) i);
+            }
+        }
+    }
+
+    public void removeAll(){
+        personList.clear();
+    }
+
+    public int count(){
+        return personList.size();
+    }
+
+    public E[] toArray(){
+
+        return (E[]) personList.toArray(new Person[0]);
+    }
+
+
+    @Override
+    public Iterator<E> iterator() {
+        return personList.iterator();
+    }
+}

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

@@ -1,5 +1,23 @@
 package io.zipcoder.interfaces;
 
 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 +1,20 @@
+package io.zipcoder.interfaces;
+
+public class Student extends Person implements Learner {
+
+    double totalStudyTime;
+
+    public Student(long id, String name) {
+        super(id, name);
+    }
+
+    @Override
+    public void learn(double numberOfHours) {
+        totalStudyTime += numberOfHours;
+    }
+
+    @Override
+    public Double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+}

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

@@ -0,0 +1,21 @@
+package io.zipcoder.interfaces;
+
+public final class Students extends People<Student> {
+
+    private static final Students INSTANCE = new Students();
+
+    private Students(){
+        Student student = new Student(2, "John");
+        Student student1 = new Student(3, "Bob");
+        Student student2 = new Student(4, "Mikey");
+
+        personList.add(student);
+        personList.add(student1);
+        personList.add(student2);
+
+    }
+    public static Students getInstance(){
+        return INSTANCE;
+    }
+
+}

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

@@ -0,0 +1,9 @@
+package io.zipcoder.interfaces;
+
+public interface Teacher {
+
+    void teach(Learner learner, double numberOfHours);
+
+    void lecture(Learner[] learners, double numberOfHours);
+
+}