Learner lab Part 7 and 8 completed

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

@@ -0,0 +1,25 @@
+package com.github.curriculeon;
+
+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 method invoking learn() method which invokes learn method on specified Learner object
+        learner.learn(numberOfHours);
+    }
+
+    @Override
+    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/Instructors.java

@@ -0,0 +1,25 @@
+package com.github.curriculeon;
+
+import java.util.List;
+
+
+public class Instructors extends People<Instructor> {
+    private static final Instructors instance = new Instructors();
+
+    public Instructors() {
+        this.add(new Instructor(0L, "Leon Hunter"));
+        this.add(new Instructor(1L, "Haseeb Muhammad"));
+    }
+
+    @Override
+    public Instructor[] toArray() {
+        int sizeOfArray = count();
+        Instructor[] destinationArray = new Instructor[sizeOfArray];
+        List<Instructor> sourceList = personList;
+        return sourceList.toArray(destinationArray);
+    }
+
+    public static Instructors getInstance() {
+        return instance;
+    }
+}

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

@@ -0,0 +1,6 @@
+package com.github.curriculeon;
+
+public interface Learner {
+    void learn(Double numberOfHours);
+    Double getTotalStudyTime();
+}

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

@@ -0,0 +1,76 @@
+package com.github.curriculeon;
+
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+
+
+//Created class People
+
+public abstract class People<SomeLearnerType extends Person> implements Iterable<SomeLearnerType> {
+
+    //Instantiated a List field of Person objects named personList
+//Only Declaration
+    List<SomeLearnerType> personList;
+
+    public People() {
+        this(new ArrayList<>());
+    }
+
+    public People(List<SomeLearnerType> personList) {
+        this.personList = personList;
+    }
+
+    public void add(SomeLearnerType person) {
+        this.personList.add(person);
+    }
+
+    public SomeLearnerType findById(long id) {
+        for (int i = 0; i < personList.size(); i++) {
+            SomeLearnerType person = personList.get(i);
+            if (person.getId() == id) { //if the id is correct,
+                return person; // return person
+            } else { // if its the wrong id,
+                continue; // keep lookin'!
+            }
+        } // finished loop; we've finished lookin'
+        return null; // we were not able to find the person with the id
+    }
+
+    public SomeLearnerType findByIdExpanded(long id) {
+        for (int i = 0; i < personList.size(); i++) {
+            SomeLearnerType person = personList.get(i);
+            if (person.getId() == id) { //if the id is correct,
+                return person; // return person
+            } else { // if its the wrong id,
+                continue; // keep lookin'!
+            }
+        } // finished loop; we've finished lookin'
+        return null; // we were not able to find the person with the id
+    }
+
+    public Boolean contains(SomeLearnerType specifiedPerson) {
+        return personList.contains(specifiedPerson);
+    }
+
+    public void remove(SomeLearnerType someSpecificPerson) {
+        personList.remove(someSpecificPerson);
+    }
+
+    public void removeAll() {
+        personList.clear();
+    }
+
+    public int count() {
+        return personList.size();
+    }
+
+    abstract public SomeLearnerType[] toArray();
+
+    @Override
+    public Iterator<SomeLearnerType> iterator() {
+        return personList.iterator();
+    }
+}

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

@@ -1,5 +1,29 @@
 package com.github.curriculeon;
 
 public class Person {
+    //non primitive Long
+    //Changing variables to Private
+    private final Long id;
+    private String name;
 
+    public Person() {
+        this.id = null;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Person(Long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
 }

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

@@ -0,0 +1,24 @@
+package com.github.curriculeon;
+
+public class Student extends Person implements Learner {
+
+    //Instance variable
+    private double totalStudyTime;
+
+    //Constructor Student takes the argument of Long and String, passes the parameters to SuperConstructor
+    public Student(Long id, String name) {
+        super(id, name);
+    }
+//Implement the method learn which takes the argument Double
+    @Override
+    public void learn(Double numberOfHours) {
+        //increments totalStudyTime variable by specified numberOfHours argument
+        this.totalStudyTime+=numberOfHours;
+    }
+    //Implement the method getTotalStudyTime which returns totalStudyTime instance variable
+    @Override
+    public Double getTotalStudyTime() {
+        return totalStudyTime;
+
+    }
+}

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

@@ -0,0 +1,28 @@
+package com.github.curriculeon;
+
+import java.util.List;
+
+public class Students extends People<Student> {
+    private static final Students instance = new Students();
+
+    //private constructor to avoid client applications to use constructor
+    private Students(){
+        super(); // optional invocation
+        this.add(new Student(0L, "Julia"));
+        this.add(new Student(1L, "David Y"));
+        this.add(new Student(2L, "Ghasan"));
+    }
+
+
+    @Override
+    public Student[] toArray() {
+        int sizeOfArray = count();
+        Student[] destinationArray = new Student[sizeOfArray];
+        List<Student> sourceList = personList;
+        return sourceList.toArray(destinationArray);
+    }
+
+    public static Students getInstance(){
+        return instance;
+    }
+}

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

@@ -0,0 +1,6 @@
+package com.github.curriculeon;
+
+public interface Teacher {
+    void teach(Learner learner, Double numberOfHours);
+    void lecture(Learner[] learners, double numberOfHours);
+}

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

@@ -0,0 +1,98 @@
+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestConstructor {
+    //create a testImplementation method that asserts that an instructor is an instance of teacher
+
+    @Test
+    public void testImplementation() {
+
+        //given
+        Instructor instructor = new Instructor(null, null);
+
+        //when
+        boolean outcome = instructor instanceof Teacher;
+
+
+        //then
+        Assert.assertTrue(outcome);
+
+        // (all in one line)Assert.assertTrue(new Instructor(null, null)instanceof Teacher);
+    }
+
+    @Test
+    public void testInheritance() {
+
+        //given
+        Instructor instructor = new Instructor(null, null);
+
+        //when
+        boolean outcome = instructor instanceof Person;
+
+
+        //then
+        Assert.assertTrue(outcome);
+    }
+
+    @Test
+    public void testTeach(){
+
+        //given
+        Instructor instructor=new Instructor(null, null);
+        Learner learner=new Student(null, null);
+        Double numberOfHoursToTeach=134.0;
+        Double preStudyTime=learner.getTotalStudyTime();
+        //total study time before giving the lecture
+        Double expected=preStudyTime + numberOfHoursToTeach;
+
+        //when
+        //when an Instructor invokes teach method, respective student's totalStudyTime instance variable incremented by specified numberOfHours
+         //instructor is able to teach some learner for some hours, here teacher is teaching for some numberOfHoursToTeach
+        instructor.teach(learner, numberOfHoursToTeach);
+        Double actual=learner.getTotalStudyTime();
+
+
+
+        //then
+        //exected is equal to actual such that actual is equal to some TotalStudyTime
+        Assert.assertEquals(expected, actual);
+
+
+    }
+
+    @Test
+    public void testLecture() {
+        //lecture method ensures when an instructor invokes lecture method, respective array of students totalStudyTime instance variables is incremented by numberOfHours/students.length
+
+   //given
+        Teacher teacher=new Instructor(null, null);
+        Learner[] learners=new Learner[]{
+                new Student(0L,"leon"),
+                new Student(1L, "Christopher"),
+                new Student(2L, "Leon Hunter")
+
+
+        };
+        Double numberOfHours=128.0;
+        Double expected=numberOfHours/learners.length;
+
+        //when
+
+        teacher.lecture(learners, numberOfHours);
+
+
+        //then
+
+        for (int i = 0; i < learners.length; i++) {
+            Learner learner = learners[i];
+            Double actual=learner.getTotalStudyTime();
+            Assert.assertEquals(expected, actual);
+            //Assert.assertEquals(numberOfHoursToTeach, totalStudyTime);
+
+        }
+
+
+    }
+    }

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

@@ -0,0 +1,19 @@
+package com.github.curriculeon;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+
+public class TestInstructors {
+    @Test
+    public void test() {
+        Instructors instructors = Instructors.getInstance();
+        List<String> expectedNames = Arrays.asList("Leon Hunter", "Haseeb Muhammad");
+        for(Instructor instructor : instructors) {
+            Assert.assertTrue(expectedNames.contains(instructor.getName()));
+        }
+    }
+}