classDiagram
  Course "*" -- "1..*" Student
  Course "*" -- "1" Instructor
  Course "1" -- "0..*" Announcement
  Course "1" -- "0..*"  Assignment 
  
  class Course{
    - int id
    - int courseNumber
    - string courseName
    - Instructor instructor
    - List<Student> students
    - List<Assignment> assignments
    - List<Announcement> announcements
    
    + getId() : int
    + getCourseNumber(): string
    + getCourseName(): int
    + getInstructor(): Instructor
    + getAssignments(): List<Assignment>
    + getStudents(): List<Student>
    + getAnnouncements(): List<Announcement>
  }
  
  class Announcement{
    - int id
    - string title
    - string announcement
    - string date
    - string author
    
    + getId(): int
    + getTitle(): string
    + getAnnouncement(): string
    + getDate(): string
    + getAuthor(): string
  }
  
  class Student{
    - int id
    - string firstName
    - string lastName
    - string email
    + List<Course> classes
    
    + getId(): int
    + getfirstName(): string
    + getLastName(): string
    + getEmail(): string
    + checkGrades(): int
  }
  
  class Instructor{
    - int id
    - string firstName
    - string lastName
    - string email
    
    + getId(): int
    + getfirstName(): string
    + getLastName(): string
    + getEmail(): string
  }
  
  class Assignment{
    - int id
    - string description
    - int points
    - string dueDate
    - float score
    - bool isCompleted
    
    + grade(): float
    + getId(): int
    + getDescription(): string
    + getPoints(): int
    + getDueDate(): string
    + getScore(): float
    + getStatus(): bool
  } 

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