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README.md

 * Create a `testRemoveByPerson` method which ensures that the `personList` in a `People` object is **depopulated** with a respective `Person` object following the invokation of the `remove` method.
     * The class should define a method named `remove` which makes use of a `Person person` parameter to remove a respective `Person` object.
 * Create a `testRemoveById` method which ensures that the `personList` in a `People` object is **depopulated** with a respective `Person` object following the invokation of the `remove` method.
-	* 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.
+	
 * Create a `testFindById` method which ensures that a respective `Person` object with a respective `id` field is returned upon invokation of the `findById` method on a respective `People` object.
     * 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.
 *  Create a `testGetArray` which ensures the array has all the people added

interfaces-1.iml

+<?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/Instructor.java

+package io.zipcoder.interfaces;
+
+/*
+--
+### Part 5.0 - Test `Instructor`
+
+        * Create an `Instructor` class such that:
+            * `Instructor` implements the `Teacher` interface
+
+
+        * In the `Instructor` class, add 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 void teach(Learner learner, double numberOfhours) {
+
+        learner.learn(numberOfhours);
+
+    }
+
+    public void lecture(Learner[] learners, double numberOfHours) {
+
+        double numberOfHoursPerLearner = numberOfHours / learners.length;
+        //  for(String tvShow: tvShows) {
+        for (Learner l : learners) {
+            l.learn(numberOfHoursPerLearner);
+        }
+    }
+
+}

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

+package io.zipcoder.interfaces;
+
+/*
+---
+### Part 2.0 - Create `Learner` Interface
+* Create a `Learner` interface.
+	* `Learner` should declare one method signature:
+		* Method name: `learn`
+		* Method parameters: `double numberOfHours`
+		* Method return-type: `void`
+
+---
+ */
+public  interface Learner {
+
+   public void learn(double numberofHours);
+  
+    
+}
+

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

+package io.zipcoder.interfaces;
+/*
+ * Create a `People` class.
+ * The `People` class should instantiate an `ArrayList` field of `Person` objects named `personList`.
+ * The `People` class should define a method named `add` which adds a `Person` to the `personList`.
+ * The `People` class should define a method named `getCount` which returns the size of `personList`.
+ * * 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 method named `remove` which makes use of a `Person person` parameter
+ * to remove a respective `Person` object.
+ *     * 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.
+ *
+ */
+
+
+import java.util.ArrayList;
+
+public class People {
+
+    ArrayList<Person> personList;
+
+    public People() {
+        personList = new ArrayList<Person>();
+    }
+
+    public void addPerson(Person p) {
+        personList.add(p);
+    }
+
+    public int getCount() {
+        return personList.size();
+    }
+
+/*
+ * Create a `testRemoveByPerson` method which ensures that the `personList` in a `People` object is **depopulated** with a respective `Person` object following the invokation of the `remove` method.
+ * The class should define a method named `remove` which makes use of a `Person person` parameter to remove a respective `Person` object.
+
+ */
+
+    public void testRemoveByPerson(Person p) {
+            personList.remove(p);
+    }
+
+ /*
+  * Create a `testRemoveById` method which ensures that the `personList` in a `People` object is **depopulated** with a respective
+  * `Person` object following the invokation of the `remove` method.
+
+  */
+ public void testRemoveById(long id) {
+
+     for (Person p : personList) {
+
+         if (p.getId() == id) {
+
+             personList.remove(p);
+             break;
+         }
+
+     }
+ }
+
+    /*
+     *     * 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.
+     *
+     */
+    public Person findById(long id) {
+        Person tempPerson = null;
+
+        for (Person p : personList) {
+
+            if (p.getId() == id) {
+
+              tempPerson =p;
+              break;
+            }
+
+        }
+
+        return tempPerson;
+    }
+/*
+  In the `People` class,
+   define a method named
+    `getArray` which returns an array
+    representation of the `personList` field.
+ */
+  public ArrayList<Person>  getArray ()
+  {
+      return personList ;
+  }
+   /*
+    * In the `People` class, define a method named `removeAll` which clears our `personList` field.
+
+    */
+   public void removeAll()
+    {
+        personList.clear();
+    }
+}

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

 package io.zipcoder.interfaces;
 
+/*
+ * Create a `Person` class.
+ * In the `Person` class, declare a `final` field named `id` of type `long`.
+ * Create a getter for the id field
+ *  In the `Person` class, declare a field named `name` of type `String`.
+ * The `Person` class should define a `getName()` method which returns the `Person` object's `name` field.
+ * The `Person` class should define a `setName()` method which sets the `Person` object's `name` field.
+
+ */
+
 public class Person {
+    private  long id ;
+    private String name;
+
+    public Person() {
+    }
+
+    public Person(String name, long id) {
+        this.name = name;
+        this.id = id;
+    }
+
+    public long getId() {
+        return id;
+    }
 
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
 }
+
+
+

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

+package io.zipcoder.interfaces;
+/*
+---
+### Part 3.0 - Test `Student`
+* Create a `StudentTest` class.
+	* Create a `testImplementation` method that asserts that a `Student` is an `instanceof` a `Learner`.
+        * Create a `Student` class
+        * `Student` implements the `Learner` interface
+        * Add a dummy implementation for the `learn` method
+	* Create a `testInheritance` method that asserts that a `Student` is an `instanceof` a `Person`.
+        * Make the `Student` class inherit from `Person`
+        * In the `Student` class, add a field called `totalStudyTime` of type `double`
+        * In the `Student` class, implementate the `learn` method which increments the `totalStudyTime` variable by
+        * the specified `numberOfHours` argument.`
+        * In the `Student` class, add a `getTotalStudyTime()` method which returns the `totalStudyTime` instance variable.
+
+---
+ */
+
+
+public class Student  extends Person  implements Learner {
+    double totalStudyTime;
+
+    public Student(double totalStudyTime) {
+        this.totalStudyTime = totalStudyTime;
+    }
+
+    public Student() {
+        totalStudyTime =0.0;
+    }
+
+    public Student(String name, long id ) {
+        super(name, id);
+    }
+
+    public void learn(double numberofHours) {
+
+        totalStudyTime +=numberofHours ;
+    }
+    public double  getTotalStudyTime()
+    {
+      // double totalStudyTime;
+        return totalStudyTime;
+    }
+
+}

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

+package io.zipcoder.interfaces;
+
+/*
+ * Create a `Students` class.
+ * The class should be an _unextendable_ subclass of the `People` class.
+ * The class should _statically instantiate_ a `final` field named `INSTANCE` of type `Students`.
+ * The class should define a _private nullary constructor_
+ * The class should define a `getInstance` method which returns the `INSTANCE` field.
+ */
+
+public class Students extends People{
+    private static final Students ourInstance = new Students();
+
+    public static Students getInstance() {
+        return ourInstance;
+    }
+
+    private Students() {
+        ourInstance.addPerson(new Student("Ned Redmond", 1));
+        ourInstance.addPerson(new Student("Seth Abrams", 2));
+        ourInstance.addPerson(new Student("Akeem Cherry", 3));
+        ourInstance.addPerson(new Student("Whitney Martinez", 4));
+        ourInstance.addPerson(new Student("Nira Parikh", 5));
+        ourInstance.addPerson(new Student("Connor Dunnigan", 6));
+        ourInstance.addPerson(new Student("Christian Sheridan", 7));
+        ourInstance.addPerson(new Student("Curtis Cook", 8));
+        ourInstance.addPerson(new Student("Nuridalia Hernandez", 9));
+        ourInstance.addPerson(new Student("Brandon DeFrancis", 10));
+        ourInstance.addPerson(new Student("De'Jon Johnson", 11));
+        ourInstance.addPerson(new Student("Demetrius Murray", 12));
+        ourInstance.addPerson(new Student("Elliott Stansbury", 13));
+        ourInstance.addPerson(new Student("Nathan Hall", 14));
+        ourInstance.addPerson(new Student("Jae Joson", 15));
+        ourInstance.addPerson(new Student("Jacob Anderson", 16));
+        ourInstance.addPerson(new Student("Jose Bedolla", 17));
+        ourInstance.addPerson(new Student("Jenn Chao", 18));
+        ourInstance.addPerson(new Student("Jennifer Tinkler", 19));
+        ourInstance.addPerson(new Student("Jonathan Hinds", 20));
+        ourInstance.addPerson(new Student("Jay Samuels", 21));
+        ourInstance.addPerson(new Student("Jevit Tith", 22));
+        ourInstance.addPerson(new Student("Lauren Green", 23));
+        ourInstance.addPerson(new Student("Kate Moore", 24));
+        ourInstance.addPerson(new Student("Michelle DiMarino", 25));
+        ourInstance.addPerson(new Student("Maggie Pierse", 26));
+        ourInstance.addPerson(new Student("Nick Satinover", 27));
+        ourInstance.addPerson(new Student("Chaitali Patel", 28));
+        ourInstance.addPerson(new Student("Yesoda Sanka", 29));
+        ourInstance.addPerson(new Student("Saurav Kamath", 30));
+        ourInstance.addPerson(new Student("Sam Bhutani", 31));
+        ourInstance.addPerson(new Student("Soujanya Buragapu", 32));
+        ourInstance.addPerson(new Student("Steffon Williams", 33));
+        ourInstance.addPerson(new Student("Zavon Malone", 34));
+        ourInstance.addPerson(new Student("Thuy Kong", 35));
+        ourInstance.addPerson(new Student("Thulasi Puppala", 36));
+        ourInstance.addPerson(new Student("Trinh Tong", 37));
+        ourInstance.addPerson(new Student("William Brown", 38));
+        ourInstance.addPerson(new Student("Xzavia Cuello", 39));
+
+    }
+ /*
+  * In the constructor of the `Students` class,
+  * add all the students from your class so that calling `getArray` will return all the students from your cohort
+  * Each student should have a _relatively_ unique `id` field.
+  */
+
+
+}

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

+package io.zipcoder.interfaces;
+
+/*### Part 4.0 - Create `Teacher` Interface
+        * Create a `Teacher` interface.
+        * `Teacher` should declare a `teach` method signature:
+        * Method name: `teach`
+        * Method parameters:
+        * `Learner learner`
+        * `double numberOfHours`
+        * Method return-type: `void`
+
+        * `Teacher` should declare a `lecture` method signature:
+        * Method name: `lecture`
+        * Method parameters:
+        * `Learner[] learners`
+        * `double numberOfHours`
+        * Method return-type: `void`
+
+        ---
+
+*/
+public interface Teacher {
+    public void teach( Learner learner,
+                               double numberOfHours);
+    public void lecture(Learner[] learners,
+			double numberOfHours);
+
+}

src/test/java/InstructorTest.java

+import io.zipcoder.interfaces.*;
+import org.junit.Assert;
+import org.junit.Test;
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.junit.Assert.assertThat;
+
+/*
+ * Create a `InstructorTest` class.
+ * Create a `testImplementation` method that asserts that an `Instructor` is an `instanceof` a `Teacher`.
+ * Create a `testInheritance` method that asserts that a `Instructor` is an `instanceof` a `Person`.
+
+ */
+public class InstructorTest {
+    @Test
+    public void testImplementation()
+    {
+        Instructor ins=new Instructor();
+        assertThat(ins, instanceOf(Teacher.class));
+    }
+
+
+/*
+ * Create a `testInheritance` method that asserts that a `Instructor` is an `instanceof` a `Person`.
+ * Make the `Instructor` a subclass of `Person`
+
+ */
+    @Test
+    public void testInheritance()
+    {
+        Instructor ins=new Instructor();
+        assertThat(ins, instanceOf(Person.class));
+    }
+
+/*
+
+ * 	Create a `testTeach` method that ensures when an `Instructor` invokes the `teach` method, a respective student's
+ * `totalStudyTime` instance variable is incremented by the specified `numberOfHours`.
+ */
+    @Test
+    public void testTeach()
+    {
+        Instructor in=new Instructor() ;
+
+        in.teach( new Student() , 10);
+    }
+
+/*
+ * Create a `testLecture` method that ensures when an `Instructor` invokes the `lecture` method, a respective array
+ * of students' `totalStudyTime` instance variables is incremented by `numberOfHours/students.length`.
+ */
+    @Test
+    public void testLecture()
+    {
+        //Students students = Students.getInstance ();
+        Instructor in=new Instructor() ;
+        in.lecture(  Students.getInstance(), 100.0);
+    }
+}

src/test/java/StudentsTest.java

+import io.zipcoder.interfaces.Student;
+import io.zipcoder.interfaces.Students;
+import org.junit.Assert;
+import org.junit.Test;
+
+import static io.zipcoder.interfaces.Students.*;
+
+public class StudentsTest {
+ /*
+  * Create a `testSingletonInstance` method which ensures that calling `Students.getInstance()`
+   * twice will return the same instance. You can check if they are the same instance by calling
+   * the `Assert.assertSame(instance1, instance2)` method.
+  *
+  */
+    @Test
+    public void testSingletonInstance() {
+        Students s1= Students.getInstance();
+        Students s2= Students.getInstance() ;
+        Assert.assertEquals(s1,s2);
+    }
+
+    /*
+     * Create a `testInitializationSetupStudents` method
+     * which ensures that each of the students in your current cohort
+     * are in your `Students` singleton when `getArray` is called.
+     */
+    @Test
+    public void testInitializationSetupStudents () {
+
+        Students sl = Students.getInstance();
+       /* sl.addPerson(new Student("Ned Redmond", 1));
+        sl.addPerson(new Student("Seth Abrams", 2));
+        sl.addPerson(new Student("Akeem Cherry", 3));
+        sl.addPerson(new Student("Whitney Martinez", 4));
+        sl.addPerson(new Student("Nira Parikh", 5));
+        sl.addPerson(new Student("Connor Dunnigan", 6));
+        sl.addPerson(new Student("Christian Sheridan", 7));
+        sl.addPerson(new Student("Curtis Cook", 8));
+        sl.addPerson(new Student("Nuridalia Hernandez", 9));
+        sl.addPerson(new Student("Brandon DeFrancis", 10));
+        sl.addPerson(new Student("De'Jon Johnson", 11));
+        sl.addPerson(new Student("Demetrius Murray", 12));
+        sl.addPerson(new Student("Elliott Stansbury", 13));
+        sl.addPerson(new Student("Nathan Hall", 14));
+        sl.addPerson(new Student("Jae Joson", 15));
+        sl.addPerson(new Student("Jacob Anderson", 16));
+        sl.addPerson(new Student("Jose Bedolla", 17));
+        sl.addPerson(new Student("Jenn Chao", 18));
+        sl.addPerson(new Student("Jennifer Tinkler", 19));
+        sl.addPerson(new Student("Jonathan Hinds", 20));
+        sl.addPerson(new Student("Jay Samuels", 21));
+        sl.addPerson(new Student("Jevit Tith", 22));
+        sl.addPerson(new Student("Lauren Green", 23));
+        sl.addPerson(new Student("Kate Moore", 24));
+        sl.addPerson(new Student("Michelle DiMarino", 25));
+        sl.addPerson(new Student("Maggie Pierse", 26));
+        sl.addPerson(new Student("Nick Satinover", 27));
+        sl.addPerson(new Student("Chaitali Patel", 28));
+        sl.addPerson(new Student("Yesoda Sanka", 29));
+        sl.addPerson(new Student("Saurav Kamath", 30));
+        sl.addPerson(new Student("Sam Bhutani", 31));
+        sl.addPerson(new Student("Soujanya Buragapu", 32));
+        sl.addPerson(new Student("Steffon Williams", 33));
+        sl.addPerson(new Student("Zavon Malone", 34));
+        sl.addPerson(new Student("Thuy Kong", 35));
+        sl.addPerson(new Student("Thulasi Puppala", 36));
+        sl.addPerson(new Student("Trinh Tong", 37));
+        sl.addPerson(new Student("William Brown", 38));
+        sl.addPerson(new Student("Xzavia Cuello", 39));
+        */
+        // calling the getArray()
+
+        Assert.assertEquals(39, sl.getArray().size());
+    }
+
+
+}

src/test/java/io/zipcoder/interfaces/PeopleTest.java

+package io.zipcoder.interfaces;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.security.Permission;
+import java.util.ArrayList;
+
+
+/** Create a `PeopleTest` class.
+ * Create a `testAdd` method which ensures that our `personList` in our `People`
+ * class populated with respective `Person` objects
+ * Create a `testRemoveByPerson` method which ensures that the `personList` in a `People`
+ * object is **depopulated** with a respective `Person` object following the invokation of the `remove` method.
+ * * Create a `testFindById` method which ensures that a respective `Person` object with a respective `id`
+ * field is returned upon invokation of the `findById` method on a respective `People` object.
+*/
+
+public class PeopleTest {
+    @Test
+    public void testAdd()
+    {
+       People pl=new People();
+        Person p=new Person("John_1",1);
+        pl.addPerson(p ) ;
+        Assert.assertEquals(1, pl.getCount() );
+    }
+
+
+  @Test
+  public void testRemoveByPerson()
+  {
+      People pl=new People();
+      Person p=new Person("John_1",1);
+      pl.addPerson(new Person("john_1", 1)) ;
+      pl.addPerson(new Person("john_2", 2)) ;
+      pl.addPerson(new Person("john_3", 3)) ;
+      pl.addPerson(new Person("john_4", 4)) ;
+      pl.addPerson(new Person("john_5", 5)) ;
+      pl.addPerson(new Person("john_6", 6)) ;
+      pl.addPerson(new Person("john_7", 7)) ;
+      pl.addPerson(new Person("john_8", 8)) ;
+
+      pl.testRemoveByPerson(p) ;
+      Assert.assertEquals(7,pl.getCount() ) ;
+  }
+  /*
+   * * Create a `testFindById` method which ensures that a respective `Person` object with a respective `id`
+   * field is returned upon invokation of the `findById` method on a respective `People` object.
+
+   */
+    @Test
+    public void testFindById()
+    {
+        People pl=new People();
+        Person expected=new Person("John_1",1);
+        pl.addPerson(new Person("john_1", 1)) ;
+        pl.addPerson(new Person("john_2", 2)) ;
+        pl.addPerson(new Person("john_3", 3)) ;
+        pl.addPerson(new Person("john_4", 4)) ;
+        pl.addPerson(new Person("john_5", 5)) ;
+        pl.addPerson(new Person("john_6", 6)) ;
+        pl.addPerson(new Person("john_7", 7)) ;
+        pl.addPerson(new Person("john_8", 8)) ;
+
+        Person actualPerson = pl.findById(expected.getId() );
+        Assert.assertEquals(expected,actualPerson  ) ;
+
+    }
+
+    /*
+      Create a `testGetArray` which ensures the array has all the people added
+
+     */@Test
+     public void testGetArray()
+     {
+         People pl=new People();
+         pl.addPerson(new Person("john_1", 1)) ;
+         pl.addPerson(new Person("john_2", 2)) ;
+         pl.addPerson(new Person("john_3", 3)) ;
+         pl.addPerson(new Person("john_4", 4)) ;
+         pl.addPerson(new Person("john_5", 5)) ;
+         pl.addPerson(new Person("john_6", 6)) ;
+         pl.addPerson(new Person("john_7", 7)) ;
+         pl.addPerson(new Person("john_8", 8)) ;
+
+        ArrayList < Person> expected= pl.getArray();
+        Assert.assertEquals(pl.getCount(),expected.size() ) ;
+
+     }
+
+   /* Create a `testRemoveAll` method which ensures you remove all the person added
+
+     */
+   @Test
+    public void testRemoveAll()
+   {
+       People pl=new People();
+       pl.addPerson(new Person("john_1", 1)) ;
+       pl.addPerson(new Person("john_2", 2)) ;
+       pl.addPerson(new Person("john_3", 3)) ;
+       pl.addPerson(new Person("john_4", 4)) ;
+       pl.addPerson(new Person("john_5", 5)) ;
+       pl.addPerson(new Person("john_6", 6)) ;
+       pl.addPerson(new Person("john_7", 7)) ;
+       pl.addPerson(new Person("john_8", 8)) ;
+       pl.removeAll() ;
+      Assert.assertEquals(0,pl.getCount() );
+   }
+}

src/test/java/io/zipcoder/interfaces/StudentTest.java

+package io.zipcoder.interfaces;
+
+import org.junit.Test;
+
+/** Create a `StudentTest` class.
+ * Create a `testImplementation` method that asserts that a `Student` is an `instanceof` a `Learner`.
+ * Create a `testLearn` method that ensures a `Student`'s `totalStudyTime` instance variable is incremented
+ * by the specified `numberOfHours` by invoking the `.learn` method.
+*/
+public class StudentTest {
+    @Test
+    public void testImplementation()
+    {
+      Student s=new Student();
+      if(s instanceof Learner ) {
+      }
+    }
+    @Test
+    public void testInheritance ()
+    {
+        Student sc=new Student() ;
+        if(sc instanceof Person ){
+
+        }
+    }
+    @Test
+    public void testLearn()
+    {
+        Student sc=new Student() ;
+
+       sc.learn(3.4) ;
+    }
+}

src/test/java/io/zipcoder/interfaces/TestPerson.java

 package io.zipcoder.interfaces;
 
+import org.junit.Test;
+
+/*
+---
+### Part 1.0 - Test `Person`
+* Create a `PersonTest` class.
+	* Create a `testConstructor` method
+	    * which ensures that a `Person` object's `id` field is being set upon construction.
+	 * To check if the id has been set, call the `getId()` method of the person class which will return a long
+
+	* Create a `testSetAndGetName` method which ensures that a `Person` object's `name` variable is being set by
+	* invoking the `.setName` method and when you call `getName()` it will return the name you set
+        *
+---
+
+ */
+
 public class TestPerson {
 
+    Person  p= new Person() ;
+    public TestPerson() {
+      p.getId() ;
+    }
+
+    @Test
+    public void testSetAndGetName(String  name)
+    {
+        p.setName(name) ;
+    }
 }