I've been trying to keep coupling down in my code, but I think I may not fully understand it. My basic understanding is that coupling is "how dependent classes are on each other and know about the behavior of each other." I know that dependency injection is one way to reduce coupling and IoC.
The following is an quick example I came up of a Student, Professor, and Course. A course has a list of students and a professor. I have a controller (using MVC) that injects the Student and Professor objects. Would the following still be considered coupled, or tightly coupled? This also would be an example of DI, correct?
Student class
public class Student {
private String firstName;
private String lastName;
private int studentID;
private int address;
private int telephone;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getStudentID() {
return studentID;
}
public void setStudentID(int studentID) {
this.studentID = studentID;
}
public int getAddress() {
return address;
}
public void setAddress(int address) {
this.address = address;
}
public int getTelephone() {
return telephone;
}
public void setTelephone(int telephone) {
this.telephone = telephone;
}
}
Professor Class
public class Professor {
private String firstName;
private String lastName;
private int professorID;
private int address;
private int telephone;
private int salary;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getProfessorID() {
return professorID;
}
public void setProfessorID(int professorID) {
this.professorID = professorID;
}
public int getAddress() {
return address;
}
public void setAddress(int address) {
this.address = address;
}
public int getTelephone() {
return telephone;
}
public void setTelephone(int telephone) {
this.telephone = telephone;
}
public int getSalary() {
return salary;
}
public void setSalary(int salary) {
this.salary = salary;
}
}
Course Class
import java.util.List;
public class Course {
private List<Student> students;
private Professor professor;
public Professor getProfessor() {
return professor;
}
public void setProfessor(Professor professor) {
this.professor = professor;
}
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
}
