String input validation in special form

Question

I'm Trying to except employeenumber XXX-L where x a digit in range 0-9 and L a letter in range of A-M. I'm trying to get this code work. but I can't enter A valid input.

import java.util.Scanner;
import java.util.InputMismatchException;

public class ObjectOrinetPrograming
{
    public static void main( String [] args )
    {
        Scanner input = new Scanner (System.in);
        System.out.println("Please Enter elements: ");
        String employeenumber = input.nextLine();
        while (employeenumber.length() != 5)
        {
            System.out.println("invalid input; lenght, Try again:");
            employeenumber = input.nextLine();
        }


            while (employeenumber.charAt(4) != ('A'|'B'|'C'|'D'|'E'|'F'|'G'|'H'|'I'|'J'|'K'|'L'|'M'))
            {
                System.out.print("invalid input; charrecter match, try again:");
                employeenumber = input.nextLine();
            }


        while (employeenumber.charAt(0) == '-')
        {
            System.out.println("Invalid Input; form, try again:");
            employeenumber = input.nextLine();
        }
        }

}

Raghav · Accepted Answer · 2016-11-17 00:51:19Z

1

You can use regular expression to match input employeenumber.

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.println("Please Enter elements: ");
    String employeenumber = input.nextLine();
    while (!employeenumber.matches("[0-9]{3}-[A-M]")) {
        System.out.println("invalid input; lenght, Try again:");
        employeenumber = input.nextLine();
    }

    System.out.println("Your employee id is " + employeenumber);

}

edited Nov 17, 2016 at 0:51

answered Nov 17, 2016 at 0:21

Raghav

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6 Comments

m4heshd Over a year ago

A small correction. the regex should be [0-9]{3}-[A-M]

Muzy Over a year ago

@iNan thank you so much but i tried it and whenever I input for example : 123-A which is the correct input i still get invalid input. I think your code except one character as an input what i'm trying to do is excepting 5 characters. But thanks anyways.

Muzy Over a year ago

@m4heshd after applying the editing it worked. Thanks a lot guys.

Muzy Over a year ago

Can some one explain why {3} matter and what does it means or do?

Muzy Over a year ago

@m4heshd thanks a lot so i'm trying to play with it little bit i noticed that if i add another [a-m] beside the [A-M] wont work for small letters i'm trying to figure it out. thanks alot

|

BlackHatSamurai · Accepted Answer · 2016-11-17 00:50:25Z

0

You should use matches, which will allow you validate all your inputs:

import java.util.Scanner;
import java.util.InputMismatchException;
public class ObjectOrinetPrograming
{
    public static void main( String [] args )
    {
        Scanner input = new Scanner (System.in);
        System.out.println("Please Enter elements: ");
        String employeenumber = input.nextLine();

        while (!employeenumber.matches("[0-9]{3}-[A-Ma-m]")) {
            System.out.println("invalid input; lenght, Try again:");
            employeenumber = input.nextLine();
        }

    }

}

edited Nov 17, 2016 at 0:50

answered Nov 17, 2016 at 0:29

BlackHatSamurai

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1 Comment

m4heshd Over a year ago

@Muzy then the regex would simply be [0-9]{3}-[A-Ma-m] to match your requirement.

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