Part 1

src/main/java/com/github/curriculeon/Instructor.java

@@ -0,0 +1,19 @@
+package com.github.curriculeon; //package is a grouping of related classes and interfaced; prevents naming conflicts
+
+public class Instructor extends Person implements Teacher{ //Instructor is child of Person
+    public Instructor(Long id, String name) { //Long id and String name are the 2 params
+        super(id, name); //super is used to call a nonparameterless constructor in Parent (Person) class
+    }
+    @Override //new version of method in child class
+    public void teach(Learner learner, Double numberOfHours) {
+        learner.learn(numberOfHours);
+    }
+    @Override //new version of method in child class
+    public void lecture(Learner[] learners, Double numberOfHours) {
+        double numberOfHoursPerLearner = numberOfHours / learners.length;
+        for (int i = 0; i < learners.length; i++) {
+            Learner learner = learners[i];
+            learner.learn(numberofHoursPerLearner);
+        }
+    }
+}

src/main/java/com/github/curriculeon/Learner.java

@@ -0,0 +1,7 @@
+package com.github.curriculeon;
+
+public interface Learner {
+    //Learner interface and all methods are implemented by Person class
+    void learn(Double numberOfHours);
+    Double getTotalStudyTime();
+}

src/main/java/com/github/curriculeon/Person.java

@@ -1,5 +1,25 @@
 package com.github.curriculeon;
 
-public class Person {
+public class Person { //Person is parent class
+    final long id; //final cannot change
+    private String name;
+
+    public Person() {
+        this.id = null;
+    }
+
+    Person(long id, String name){
+        this.id = id;
+        this.name = name;
+    }
+    public long getId(){
+        return id;
+    }
+    public String getName(){  //get method/getter used because name is private
+        return name;
+    }
+    public void setName(String name){ //set method/setter used because name is private
+        this.name = name;
+    }
 
 }

src/main/java/com/github/curriculeon/Student.java

@@ -0,0 +1,19 @@
+package com.github.curriculeon;
+
+public class Student extends Person implements Learner { //Student is child of Person class and accesses public methods via extends
+    private double totalStudyTime;
+
+    public Student(Long id, String name) {
+        super(id, name);//super is used to call a nonparameterless constructor in the parent class Person
+    }
+
+    @Override//allows new version of method in child class
+    public void learn(Double numberOfHours) {
+        this.totalStudyTime = totalStudyTime + numberOfHours;
+    }
+
+    @Override//allows new version of method in child class
+    public Double getTotalStudyTime() {
+        return totalStudyTime;
+    }
+}

src/main/java/com/github/curriculeon/Teacher.java

@@ -0,0 +1,6 @@
+package com.github.curriculeon;
+
+public interface Teacher {//this interface is implemented by Person class
+    void teach(Learner learner, Double numberOfHours);
+    void lecture(Learner[] learners, Double numberOfHours);
+}

src/test/java/com/github/curriculeon/TestPerson.java

@@ -1,5 +1,38 @@
 package com.github.curriculeon;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class TestPerson {
+    public void testConstructor() {
+        // given
+        Long expectedId = 0L;
+        String expectedName = "Some name";
+
+        // when
+        Person person = new Person(expectedId, expectedName);
+        String actualName = person.getName();
+        Long actualId = person.getId();
+
+        // then
+        Assert.assertEquals(expectedId,actualId);
+        Assert.assertEquals(expectedName,actualName);
+    }
+
+    @Test
+    public void testSetName() {
+        // given
+        Person person = new Person(-1,null);
+        String expectedName = "Some name";
+        Assert.assertNotEquals(expectedName, person.getName());
 
+        // when
+        person.setName(expectedName);
+        String actualName = person.getName();
+
+        // then
+        Assert.assertEquals(expectedName,actualName);
+    }
 }
+
+