Question

In this assessment, you will design and code a Java console application that validates the data entry of a course code (like IT4782) and report back if the course code is valid or not valid. The application uses the Java char and String data types to implement the validation. You can use either the Toolwire environment or your local Java development environment to complete this assignment.

The requirements of this application are as follows: The application is to read a course code entered by the user from the keyboard. The course code is made of 5 characters and should follow these rules:

• First character is always an upper case I or a lower case i

• Second character is always an upper case T or a lower case t

• Third, fourth, fifth, and sixth characters are always digits (0-9)

The application then validates the course code against above the rules and prints a message if the course code is valid or not. If the course code is not valid, the application should print a message explaining why the course code is not valid.

Use these course codes to test your application: IT4782 iT4782 OT4782 it&782 .

Also use commenting throughout your code to explain what each statement is doing and why it was needed. Successful completion of this assignment will show a valid message or an invalid message for the entered course code. In addition, if the course code is invalid, the application should identify the reason for the invalidation.

Answer 1

Java Program:

import java.util.Scanner;

public class CourseCodeValidator {

   public static void main(String[] args) {
       // Scanner class to read input from user from the keyboard
       Scanner scan = new Scanner(System.in);
      
       //asking user input/course code
       System.out.println("Enter the course code:");
       String courseCode = scan.next();
      
       //condition course code length must be 6
       if(courseCode.length() == 6) {
           //validating first character of course code
           if(courseCode.charAt(0)=='I' || courseCode.charAt(0)=='i') {
              
               //validating second character of course code
               if(courseCode.charAt(1)=='T' || courseCode.charAt(1)=='t') {
                  
                   //counter to count the number of digits in the course code
                   int counter = 0;
              
                   //loop to traverse on Third, fourth, fifth, and sixth characters of course code
                   for(int i=2;i<courseCode.length();i++) {
                      
                       //getting characters from course code
                       char ch = courseCode.charAt(i);
                      
                       //validating Third, fourth, fifth, and sixth characters of course code
                       if(ch >= '0' && ch <= '9')
                   {
                           //increment the counter
                           counter = counter + 1;
                   continue;
                   }else {
                           System.out.println(courseCode+" course code is invalid.");
                           System.out.println((i+1)+" character should be digit(0-9).");
                   }
                   }
                   //if counter is 4,it means,Third, fourth, fifth, and sixth characters are digits
                   if(counter ==4) {
                       System.out.println(courseCode+" course code is valid.");
                   }
               }else {//invalid condition
                   System.out.println(courseCode+" course code is invalid.");
                   System.out.println("Second character should be either 'T' or 't'.");
               }
              
           }else {//invalid condition
               System.out.println(courseCode+" course code is invalid.");
               System.out.println("First character should be either 'I' or 'i'.");
           }
       }else { //invalid condition
           System.out.println(courseCode+" course code is invalid.");
           System.out.println("Course code is made of 6 characters.");
       }  
   }
}

Output: Case 1

Enter the course code:
IT4782
IT4782 course code is valid.

Output: Case 2

Enter the course code:
iT4782
iT4782 course code is valid

Output: Case 3

Enter the course code:
OT4782
OT4782 course code is invalid.
First character should be either 'I' or 'i'.

Output: Case 4

Enter the course code:
it&782
it&782 course code is invalid.
3 character should be digit(0-9).