add

.classpath

+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="src" path=""/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/5"/>
+	<classpathentry kind="output" path=""/>
+</classpath>

.project

+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>lab-6</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

com/university/Course.java

+package com.university;
+
+import java.util.ArrayList;
+
+public class Course {
+	private String ID;
+	private String name;
+	private Department department;
+	private Professor professor;
+	private int credit;
+	ArrayList<Student> students = new ArrayList<>();
+	public Course(String ID, String name, Department department, Professor professor, int credit) {
+		this.credit=credit;
+		this.department=department;
+		this.ID=ID;
+		this.name=name;
+		this.professor=professor;
+	}
+
+	public String getID(){
+		return this.ID;
+	}
+
+	public Department getDepartment(){
+		return this.department;
+	}
+
+	public String getName() {
+		return this.name;
+	}
+
+	public Student[] getStudents() {
+		Student[] arr = new Student[students.size()];
+		return students.toArray(arr);
+	}
+
+	public Professor getProfessor() {
+		return this.professor;
+	}
+
+	public int getCredit() {
+		return this.credit;
+	}
+
+	public void enrollStudent(Student student){
+		if(student.getDepartment()== this.department)
+			students.add(student);
+	}
+
+}

com/university/Department.java

+package com.university;
+
+import java.util.ArrayList;
+
+public class Department {
+	private String name;
+	private ArrayList<Student> students = new ArrayList<>();
+	private ArrayList<Course> courses = new ArrayList<>();
+	private ArrayList<Professor> professors = new ArrayList<>();
+
+	public Department(String name) {
+		this.name = name;
+	}
+
+	public String getName(){
+		return this.name;
+	}
+
+	public void addStudent(Student student){
+		if(student.getDepartment() == this)
+			students.add(student);
+	}
+
+	public Student[] getStudents(){
+		Student[] arr = new Student[students.size()];
+		return students.toArray(arr);
+	}
+
+	public void removeStudent(Student student){
+		if(student.getDepartment() != this)
+			return;
+		for(int i=0;i<students.size();i++) {
+			if(students.get(i) ==  student) {
+				students.remove(student);
+				break;
+			}
+		}
+	}
+
+	public void addCourse(Course course){
+		if(course.getDepartment() == this)
+			courses.add(course);
+	}
+
+	public Course[] getCourses(){
+		Course[] arr = new Course[courses.size()];
+		return courses.toArray(arr);
+	}
+
+	public void removeCourse(Course course){
+		if(course.getDepartment() != this)
+			return;
+		for(int i=0;i<courses.size();i++) 
+			if(courses.get(i) ==  course) {
+				courses.remove(course);
+				break;
+			} 
+	}
+
+	public void addProfessor(Professor professor){
+		if(professor.getDepartment() == this)
+			professors.add(professor);
+		if(professor.getDepartment() != this)
+			return;
+	}
+
+	public Professor[] getProfessors(){
+		Professor[] arr = new Professor[professors.size()];
+		return professors.toArray(arr);
+	}
+
+	public void removeProfessor(Professor professor){
+		if(professor.getDepartment() != this)
+    		return;
+    	for(int i=0;i<professors.size();i++) {
+    		if(professors.get(i) ==  professor) {
+    			professors.remove(professor);
+    			break;
+    		}
+    	}
+	}
+
+}

com/university/Professor.java

+package com.university;
+
+public class Professor {
+	private Department department;
+	private String name;
+	private Course[] courses;
+
+    public Professor(Department department, String name) {
+    	this.department=department;
+    	this.name=name;
+    	courses = new Course[1];
+    }
+
+    public Department getDepartment() {
+        return this.department;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public Course[] getCourses() {
+    	
+        return courses;
+    }
+}

com/university/Student.java

+package com.university;
+
+import java.util.ArrayList;
+
+public class Student {
+	private String name;
+	private String ID;
+	private String major;
+	private Department department;
+	private ArrayList<Course> courses = new ArrayList<>();   
+	public Student(String name, String ID, String major, Department department) {
+    	this.name = name;
+    	this.ID = ID;
+    	this.major = major;
+    	this.department = department;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public String getID() {
+        return this.name;
+    }
+
+    public String getMajor() {
+        return this.name;
+    }
+
+    public Department getDepartment() {
+        return this.department;
+    }
+
+    public Course[] getCourses() {
+    	Course[] arr = new Course[courses.size()];
+        return courses.toArray(arr);
+    }
+
+    public void addCourse(Course course){
+    	if(course != null)
+    		courses.add(course);
+    }
+    
+}

com/university/University.java

+package com.university;
+
+import java.util.ArrayList;
+
+public class University {
+	ArrayList<Department> departments = new ArrayList<>();
+    public Department[] getDepartments(){
+    	Department[] arr = new Department[departments.size()];
+        return departments.toArray(arr);
+    }
+
+    public void addDepartment(Department department){ 
+    	departments.add(department);
+    }
+
+    public void removeDepartment(Department department){
+    	for(int i=0;i<departments.size();i++)
+    		if(departments.get(i) == department)
+    			departments.remove(department);
+    }
+}

test/CourseTest.java

+package test;
+
+import static org.junit.Assert.assertNotNull;
+
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import com.university.Course;
+import com.university.Department;
+import com.university.Professor;
+
+class CourseTest {
+	static Professor professor;
+	static Department department;
+	static Course course;
+
+	@BeforeAll
+	public static void createCourse(){
+		department = new Department("Computer and IT Eng");
+		professor = new Professor(department, "Kalbasi");
+		course = new Course("1","Advanced Programming",department,professor,3);
+	}
+
+	@Test
+	public void testCourseGetID(){
+		assertNotNull(course.getID());
+	}
+
+	@Test
+	public void testCourseGetDepartment(){
+		assertNotNull(course.getDepartment());
+	}
+	@Test
+	public void testCourseGetName() {
+		assertNotNull(course.getName());
+	}
+	@Test
+	public void testCourseGetProfessor() {
+		assertNotNull(course.getProfessor());
+	}
+
+
+}
+
+
+
+

test/ProfessorTest.java

+package test;
+
+import static org.junit.Assert.assertNotNull;
+
+
+import org.junit.Test;
+import org.junit.jupiter.api.BeforeAll;
+
+import com.university.Department;
+import com.university.Professor;
+
+class ProfessorTest {
+
+	static Professor professor;
+	static Department department;
+
+	@BeforeAll
+	public static void createProfessor() {
+		department = new Department("Computer and IT Eng");
+		professor=new Professor(department,"Kalbasi");
+	}
+	@Test
+	public void testProfessorGetName() {
+		assertNotNull(professor.getName());
+	}
+	@Test
+	public void testProfessorGetDepartment() {
+		assertNotNull(professor.getDepartment());
+	}
+
+}

test/StudentTests.java

+package test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.jupiter.api.BeforeAll;
+
+import com.university.Department;
+import com.university.Student;
+
+
+public class StudentTests {
+    static Student student;
+    static Department department;
+
+    @BeforeAll
+    public static void createStudent(){
+        department = new Department("Computer and IT Eng");
+        student = new Student("Alireza", "1234", "Software Eng", department);
+    }
+
+    @Test
+    public void testStudentGetName(){
+        assertEquals("Alireza", student.getName());
+    }
+
+    @Test
+    public void testStudenGetCourses(){
+        assertNotNull(student.getCourses());
+        assertEquals(0, student.getCourses().length);
+    }
+    @Test
+    public void testStudentGetID() {
+    	assertNotNull(student.getID());
+    }
+    @Test
+    public void testStudentGetDepartment() {
+    	assertNotNull(student.getDepartment());
+    }
+    @Test
+    public void testStudentGetMajor() {
+    	assertNotNull(student.getMajor());
+    }
+    
+
+}

test/TestDepartment.java

+package test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import com.university.Department;
+
+class TestDepartment {
+	static Department department;
+
+	@BeforeAll
+	public static void createDepartment() {
+		department=new Department("Computer and IT Eng");
+	}
+	@Test
+	public void testDepartmentGetStudents() {
+		assertNotNull(department.getStudents());
+	}
+	@Test
+	public void testDepartmentGetCourses() {
+		assertNotNull(department.getCourses());
+	}
+	
+	@Test
+	public void testDepartmentGetProfessors() {
+		assertNotNull(department.getProfessors());
+	}
+}

test/UniversityTest.java

+package test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import com.university.University;
+
+class UniversityTest {
+
+	static University university;
+	
+	@BeforeAll
+	public static void createUniversity() {
+		university = new University();
+	}
+	
+
+}