Week 4 Assignment

package u04a1_validateuserinput;

import java.util.Scanner;

/**
 *
 * @author leonlewis
 */
public class U04A1_ValidateUserInput {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String userInput;
        boolean isValid = true;

        System.out.print("Enter a course code to validate (e.g. IT4782): ");
        userInput = input.nextLine();

        /* only to be used with different algorithm
        if(ValidateInput(userInput)){
            System.out.println("Course code " + userInput + " is valid.");
        }
        */

        if (userInput.length() != 6){
            System.out.println("The course code is not the right length.");
        }
        else{
            if(Character.toLowerCase(userInput.charAt(0)) != 'i'){
                System.out.println("First character is not an I or an i");
                isValid = false;
            }
            if(Character.toLowerCase(userInput.charAt(1)) != 't'){
                System.out.println("Second character is not a T or a t");
                isValid = false;
            }
            if(!Character.isDigit(userInput.charAt(2))){
                System.out.println("Third character is not a digit");
                isValid = false;
            }
            if(!Character.isDigit(userInput.charAt(3))){
                System.out.println("Fourth character is not a digit");
                isValid = false;
            }
            if(!Character.isDigit(userInput.charAt(4))){
                System.out.println("Fifth character is not a digit");
                isValid = false;
            }
            if(!Character.isDigit(userInput.charAt(5))){
                System.out.println("Sixth character is not a digit");
                isValid = false;
            }
            if(isValid){
                System.out.println("Course code " + userInput + " is valid.");
            }

        }
    }

    // Different algorithm because I did not like reusing
    // the if statement over and over again.
    private static boolean ValidateInput(String userInput){
        String namedArray[] = {"First", "Second", "Third", "Fourth", "Fifth", "Sixth" };
        String reason[] = {"not an i or an I", "not a t or a T", "not a digit"};
        boolean isValid = true;

        for(int i = 0; i < userInput.length(); i++){
            if(i == 0 || i == 1){
                char tempChar = Character.toLowerCase(userInput.charAt(i));
                String it = "it";
                if(tempChar != it.charAt(i)){
                    System.out.println(namedArray[i] + " character is " + reason[i]);
                    isValid = false;
                }
            }else {
                if(!Character.isDigit(userInput.charAt(i))){
                    System.out.println(namedArray[i] + " character is " + reason[2]);
                    isValid = false;
                }
            }
        }
        return isValid;
    }
}