feat: adds lesson16 homework by Yemi (code-differently#515)

* feat: adds lesson16 homework by Yemi

* feat: adds lesson16 homework by Yemi

* feat:adds new package name for lesson16 homework by Yemi

* feat:adds new package name for lesson16 homework by Yemi

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/studentinfo/Department.java

@@ -0,0 +1,9 @@
+package com.codedifferently.lesson16.studentinfo;
+
+public enum Department {
+  Sales,
+  Finance,
+  Technology,
+  Research,
+  Administration
+}

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/studentinfo/Student.java

@@ -0,0 +1,96 @@
+package com.codedifferently.lesson16.studentinfo;
+
+import java.time.LocalDate;
+import java.util.List;
+
+public class Student {
+  private long studentNumber;
+  private String fullName;
+  private Department department;
+  private String emailAddress;
+  private List<String> phoneNumbers;
+  private LocalDate dateOfBirth;
+
+  public Student(
+      long studentNumber,
+      String fullName,
+      Department department,
+      String emailAddress,
+      List<String> phoneNumbers,
+      LocalDate dateOfBirth) {
+    this.studentNumber = studentNumber;
+    this.fullName = fullName;
+    this.department = department;
+    this.emailAddress = emailAddress;
+    this.phoneNumbers = phoneNumbers;
+    this.dateOfBirth = dateOfBirth;
+  }
+
+  public long getStudentNumber() {
+    return studentNumber;
+  }
+
+  public void setStudentNumber(long studentNumber) {
+    this.studentNumber = studentNumber;
+  }
+
+  public String getFullName() {
+    return fullName;
+  }
+
+  public void setFullName(String fullName) {
+    this.fullName = fullName;
+  }
+
+  public Department getDepartment() {
+    return department;
+  }
+
+  public void setDepartment(Department department) {
+    this.department = department;
+  }
+
+  public String getEmailAddress() {
+    return emailAddress;
+  }
+
+  public void setEmailAddress(String emailAddress) {
+    this.emailAddress = emailAddress;
+  }
+
+  public List<String> getPhoneNumbers() {
+    return phoneNumbers;
+  }
+
+  public void setPhoneNumbers(List<String> phoneNumbers) {
+    this.phoneNumbers = phoneNumbers;
+  }
+
+  public LocalDate getDateOfBirth() {
+    return dateOfBirth;
+  }
+
+  public void setDateOfBirth(LocalDate dateOfBirth) {
+    this.dateOfBirth = dateOfBirth;
+  }
+
+  @Override
+  public String toString() {
+    return "Student{"
+        + "studentNumber="
+        + studentNumber
+        + ", fullName='"
+        + fullName
+        + '\''
+        + ", department="
+        + department
+        + ", emailAddress='"
+        + emailAddress
+        + '\''
+        + ", phoneNumbers="
+        + phoneNumbers
+        + ", dateOfBirth="
+        + dateOfBirth
+        + '}';
+  }
+}

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/studentinfo/StudentNotFoundException.java

@@ -0,0 +1,7 @@
+package com.codedifferently.lesson16.studentinfo;
+
+public class StudentNotFoundException extends RuntimeException {
+  public StudentNotFoundException(String message) {
+    super(message);
+  }
+}

lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/studentinfo/StudentService.java

@@ -0,0 +1,43 @@
+package com.codedifferently.lesson16.studentinfo;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class StudentService {
+
+  private final Map<Long, Student> students;
+
+  public StudentService() {
+    students = new HashMap<>();
+  }
+
+  private void checkIfStudentExist(long studentNumber) {
+    if (students.containsKey(studentNumber)) {
+      return;
+    }
+    throw new StudentNotFoundException("Student with number " + studentNumber + " not found");
+  }
+
+  public void deleteStudent(long studentNumber) {
+    checkIfStudentExist(studentNumber);
+    students.remove(studentNumber);
+  }
+
+  public void addStudent(Student student) {
+    students.put(student.getStudentNumber(), student);
+  }
+
+  public int countNumberOfTechDeptStudents() {
+    int count = 0;
+    for (Student student : students.values()) {
+      if (student.getDepartment().equals(Department.Technology)) {
+        count++;
+      }
+    }
+    return count;
+  }
+
+  public Student findStudentByStudentNumber(long studentNumber) {
+    return students.get(studentNumber);
+  }
+}

lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/studentinfo/StudentServiceTest.java

@@ -0,0 +1,157 @@
+package com.codedifferently.lesson16.studentinfo;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class StudentServiceTest {
+
+  StudentService classUnderTest;
+  Map<Long, Student> students;
+
+  @BeforeEach
+  public void setUp() {
+    classUnderTest = new StudentService();
+
+    students = new HashMap<>();
+
+    List<String> phoneNumbers1 = new ArrayList<>();
+    phoneNumbers1.add("301-999-3222");
+    phoneNumbers1.add("301-211-3222");
+    phoneNumbers1.add("301-212-3777");
+
+    Student student1 =
+        new Student(
+            112453698l,
+            "Jane Doe",
+            Department.Finance,
+            "[email protected]",
+            phoneNumbers1,
+            LocalDate.of(2021, 11, 20));
+
+    List<String> phoneNumbers2 = new ArrayList<>();
+    phoneNumbers2.add("301-777-3222");
+    phoneNumbers2.add("301-777-3222");
+    phoneNumbers2.add("301-777-3777");
+
+    Student student2 =
+        new Student(
+            712453698l,
+            "Johnie Walker",
+            Department.Technology,
+            "[email protected]",
+            phoneNumbers2,
+            LocalDate.of(2021, 10, 26));
+
+    List<String> phoneNumbers3 = new ArrayList<>();
+    phoneNumbers2.add("303-999-3222");
+    phoneNumbers2.add("303-999-3222");
+    phoneNumbers2.add("303-999-3777");
+
+    Student student3 =
+        new Student(
+            912453698l,
+            "Fannie May",
+            Department.Technology,
+            "[email protected]",
+            phoneNumbers3,
+            LocalDate.of(2017, 9, 26));
+
+    students.put(112453698l, student1);
+    students.put(712453698l, student2);
+    students.put(912453698l, student3);
+
+    classUnderTest.addStudent(student1);
+    classUnderTest.addStudent(student2);
+    classUnderTest.addStudent(student3);
+  }
+
+  @Test
+  public void testDeleteStudent_throw_Exception_IFNumber_Not_Found() {
+    // Arrange
+    Student student =
+        new Student(
+            44444444l,
+            "Gonnie ByeBye",
+            Department.Technology,
+            "[email protected]",
+            null,
+            LocalDate.of(2019, 10, 21));
+    classUnderTest.addStudent(student);
+    // Act
+    classUnderTest.deleteStudent(student.getStudentNumber());
+
+    // Assert
+    long studentNumber = 44444444l;
+    assertThatThrownBy(() -> classUnderTest.deleteStudent(studentNumber))
+        .isInstanceOf(StudentNotFoundException.class)
+        .hasMessage("Student with number " + studentNumber + " not found");
+  }
+
+  @Test
+  public void testCountNumberOfTechDeptStudents_if_any() {
+    Student student =
+        new Student(
+            44444444l,
+            "Gonnie ByeBye",
+            Department.Technology,
+            "[email protected]",
+            null,
+            LocalDate.of(2019, 10, 21));
+    classUnderTest.addStudent(student);
+    // Act
+    int numOfTechStudents = classUnderTest.countNumberOfTechDeptStudents();
+
+    // Assert
+    int expectedCount = 3;
+    assertEquals(expectedCount, numOfTechStudents);
+  }
+
+  @Test
+  public void testAddStudent() {
+    // Arrange
+    Student student =
+        new Student(
+            44444444l,
+            "Gonnie ByeBye",
+            Department.Technology,
+            "[email protected]",
+            null,
+            LocalDate.of(2019, 10, 21));
+
+    // Act
+    classUnderTest.addStudent(student);
+
+    // Assert
+    int expectedCount = 3;
+    assertEquals(expectedCount, students.size());
+  }
+
+  @Test
+  public void testFindStudentByStudentNumber_where_student_exist() {
+    // Arrange
+    Student student =
+        new Student(
+            44444444l,
+            "Gonnie ByeBye",
+            Department.Technology,
+            "[email protected]",
+            null,
+            LocalDate.of(2019, 10, 21));
+    classUnderTest.addStudent(student);
+
+    // Act
+    classUnderTest.findStudentByStudentNumber(student.getStudentNumber());
+
+    // Assert
+    long expectedStudentNumber = 44444444l;
+    assertEquals(expectedStudentNumber, student.getStudentNumber());
+  }
+}