public Student getStudent(int id) {
Student student = null;
for (Student s : this.students) {
if (s.getId() == id) {
student = s;
}
}
return student;
}
public Student modifyNationality(int id, String nationality) {
Student student = null;
for (Student s : this.students) {
if (s.getId() == id) {
s.setNationality(nationality);
student = s;
}
}
return student;
}
public Student modifyAge(int id, int age) {
Student student = null;
for (Student s : this.students) {
if (s.getId() == id) {
s.setAge(age);
student = s;
}
}
return student;
}
public Student addNewStudent(Student student) {
for (Student s : this.students) {
if (s.getFirstName().equals(student.getFirstName())
&& s.getLastName().equals(student.getLastName())
&& s.getId() == student.getId()) {
return null;
}
}
this.students.add(student);
return student;
}