JAVA HELP ASAP!!

Question

Write a program that continues to ask to enter a passcode and compares it with a predetermined 4 digit integer:

a) prompts the user to enter a # and checks every digit one by one. If the user enters an alphabet character instead of a digit, the program captures the InputMismatchException, and the process starts again from (a)

b) After the user enters all 4 digits, the program compares the resulting number to the passcode. If they don't match, the program throws its own RuntimeException and the process starts again from (a)

c) if not, the program terminates

Answer 1

import java.util.Scanner;

import java.lang.Character;

import java.lang.Exception;

class InputMismatchException extends Exception

{

public InputMismatchException(String errorMessage)

{

super(errorMessage);

}

}

class _RuntimeException extends Exception

{

public _RuntimeException(String errorMessage)

{

super(errorMessage);

}

}

class PinCodeChecker

{

protected String pinNumber;

protected Scanner scanner;

public PinCodeChecker()

{

pinNumber = "5276";

scanner = new Scanner(System.in);

}

int CheckPinNumber(String strPinNumber) throws InputMismatchException,_RuntimeException

{

int iReturn=0;

int nStrLen = strPinNumber.length();

if (nStrLen==4)

{

for (int iLoop=0; iLoop<nStrLen; iLoop++)

{

char curChChar = strPinNumber.charAt(iLoop);

System.out.println(" cur char is " + curChChar);

if (Character.isDigit(curChChar))

{

if (pinNumber.charAt(iLoop)!=curChChar)

{

iReturn=-4; //return(iReturn);

throw (new _RuntimeException(" pincode mismatch "));

}

}

else

{

iReturn=-2; //return(iReturn);

throw( new InputMismatchException("invalid pincode character"));

}

}

}

else

{

System.out.println("4 digit pin # expected ");

iReturn = -1;

}

return(iReturn);

}

public void Go()

{

boolean done_flag = false;

int iReturn=0;

while (!done_flag)

{

done_flag=true;

System.out.print(" Please input the pin # :>");

String strPinNumber = scanner.nextLine();

try

{

iReturn = CheckPinNumber(strPinNumber);

}

catch (InputMismatchException ex)

{

done_flag=false;

iReturn=-2;

System.out.println(" Please input only digits... Please try again !!! ");

}

catch (_RuntimeException ex)

{

done_flag=false;

iReturn=-4;

System.out.println(" Invalid pin #... Please try again !!! ");

}

if (iReturn==0)

{

System.out.println("Pin # is correct !!! " + pinNumber);

done_flag=true;

break;

}

else

{

done_flag=false;

}

} //while

}

public static void main(String args[])

{

PinCodeChecker x = new PinCodeChecker();

x.Go();

}

}