Question

Consider the following partial UML class diagram for the class Student:

Student
-studentID: String
-name: String
-school: String
+validateStudentID (s: Student):boolean

studentID is a string that consists of a letter representing the school followed by 5 digits. The codes used for the schools in this scenario are shown below:

School	Code	Example of student ID
FASC	'A'	"A12345" refers to a student from FASC.
FAFB	'B'	"B88888" refers to a student from FAFB.

Write the code for the method validateStudentID (Student student) such that it performs validations on the parameter's student ID to ensure that:

- the format is correct (i.e. the student ID consists of a letter followed by 5 digits) and

- the letter value corresponds to the student's school.

Answer 1

Program: In this program, we create a class Student with three attributes - studentID(String), name(String), school(String). We create a boolean method validateStudentID(Student s) which takes a student class object as its parameter and checks if the student id is in the correct format, if it is, it returns true else return false.

To test the function we also need to assign the values to the attributes and for that we create an additional parameterized constructor in our class which assigns values to the attributes.

We also create a main() method in which we can create our class object and test our function.

Code:

public class Student {

    //Class attributes
    private String studentID;
    private String name;
    private String school;

    //Constructor to initialize
    public Student(String school, String name, String studentID){
        this.school = school;
        this.name = name;
        this.studentID = studentID;
    }

    //Method validateStudentID
    public boolean validateStudentID(Student student){
        String id = this.studentID;

        //The length of string studentID must be of length 6
        if(id.length() < 6 || id.length() > 6){
            return false;
        }

        //Check if id contains a letter at the start
        if(!Character.isLetter(id.charAt(0))){
            return false;
        }

        //Check if rest of characters after letter are digits
        for (int i = 1; i < id.length(); i++) {
            if(!Character.isDigit(id.charAt(i))){
                return false;
            }
        }

        //Check if the first letter corresponds to A or B
        if(id.charAt(0) != 'A' && id.charAt(0) != 'B'){
            return false;
        }
        else {

            //If all conditions are true return true
            return true;
        }
    }

    //Main method
    public static void main(String[] args) {
        Student s = new Student("FASC","A","A12345");
        System.out.println(s.validateStudentID(s));
    }
}

Output: