Validation of Canadian postal code fails when whitespace inside

Question

I'm trying to write a program that will validate a Canadian postal code.

Given the two formats

1. A1A1A1
2. A1A 1A1

Problem

I have problems getting my code to recognize the white space in the second format.

When I validate for the second format, it prints "Invalid" twice even though it's a legitimate postal code.

Code

public class validatePostalCodeTest {
  public static void main(String[] args) {
    Scanner kb = new Scanner(System.in);
    System.out.println("Please enter postalcode:");
    while (kb.hasNext()){
        String posCode = kb.next();
        if (posCode.length() > 7) 
            System.out.println("\nInvalid");
        if (posCode.length() < 6) 
            System.out.println("\nInvalid");    
        if (posCode.length()== 7){
            boolean valid = true;
            for (int i = 0; i < posCode.length(); i++){
                char a = posCode.charAt(0);
                char b = posCode.charAt(2);
                char c = posCode.charAt(4);
                char d = posCode.charAt(1);
                char e = posCode.charAt(5);
                char f = posCode.charAt(6);
                char g = posCode.charAt(3);
                if(! Character.isLetter(a))
                    valid = false; 
                else if (! Character.isLetter(b))
                    valid = false;
                else if (! Character.isDigit(c))
                    valid = false;
                else if (! Character.isDigit(d))
                    valid = false;
                else if (! Character.isLetter(e))
                    valid = false;
                else if (! Character.isDigit(f))
                    valid = false;
                else if (! Character.isWhitespace(g))
                    valid = false;
                break;
            }
            if (valid) System.out.println("\nValid");
            else System.out.println("\nInvalid");
        }
        if (posCode.length()== 6){
            boolean valid = true;
            for (int i = 0; i < posCode.length(); i++){
                char a = posCode.charAt(0);
                char b = posCode.charAt(2);
                char c = posCode.charAt(4);
                char d = posCode.charAt(1);
                char e = posCode.charAt(3);
                char f = posCode.charAt(5);
                if(! Character.isLetter(a))
                    valid = false; 
                else if (! Character.isLetter(b))
                    valid = false;
                else if (! Character.isLetter(c))
                    valid = false;
                else if (! Character.isDigit(d))
                    valid = false;
                else if (! Character.isDigit(e))
                    valid = false;
                else if (! Character.isDigit(f))
                    valid = false;
                break;                    
            }
            if (valid) System.out.println("\nValid");
            else System.out.println("\nInvalid");
        }
        System.out.println("\nPlease enter a postalcode:");
    }
    System.out.println("Program ending due to end-of-file");
  }
}

Answer 1

You have used kb.next() which will read data with space separation, So when you will enter postal code as A1A 1A1 it will take it 2 times first one is A1A and second one is 1A1 and therefor you will get invalid output 2 times as it will take 2 time data with one space, so you need to use nextLine() it will help you to resolve your issue,

Check below resolved answer

public class validatePostalCodeTest 
{
   public static void main (String[] args) throws java.lang.Exception
   {

      Scanner kb = new Scanner(System.in);
      System.out.println("Please enter postalcode:");
      String posCode = kb.nextLine();

       if (posCode.length() > 7) 
           System.out.println("\nInvalid");
       if (posCode.length() < 6) 
           System.out.println("\nInvalid");    
       if (posCode.length()== 7){
           boolean valid = true;

            char a = posCode.charAt(0);
            char b = posCode.charAt(2);
            char c = posCode.charAt(4);
            char d = posCode.charAt(1);
            char e = posCode.charAt(5);
            char f = posCode.charAt(6);
            char g = posCode.charAt(3);
            if(! Character.isLetter(a))
                valid = false; 
            else if (! Character.isLetter(b))
                valid = false;
            else if (! Character.isDigit(c))
                valid = false;
            else if (! Character.isDigit(d))
                valid = false;
            else if (! Character.isLetter(e))
                valid = false;
            else if (! Character.isDigit(f))
                valid = false;
            else if (! Character.isWhitespace(g))
                valid = false;

           if (valid) System.out.println("\nValid");
           else System.out.println("\nInvalid");
       }
       if (posCode.length()== 6){
           boolean valid = true;

            char a = posCode.charAt(0);
            char b = posCode.charAt(2);
            char c = posCode.charAt(4);
            char d = posCode.charAt(1);
            char e = posCode.charAt(3);
            char f = posCode.charAt(5);
            if(! Character.isLetter(a))
                valid = false; 
            else if (! Character.isLetter(b))
                valid = false;
            else if (! Character.isLetter(c))
                valid = false;
            else if (! Character.isDigit(d))
                valid = false;
            else if (! Character.isDigit(e))
                valid = false;
            else if (! Character.isDigit(f))
                valid = false;


           if (valid) System.out.println("\nValid");
           else System.out.println("\nInvalid");
       }
       System.out.println("Program ending due to end-of-file");
   }
}