Thread: Problems with Code?

import java.util.*;
import java.lang.*;
/**
 * To output whether a students chosen password is valid or not.
 * 
 * @author (Sean McGlone
 * @version (December 13, 2010)
 */
class SemesterProject
{
    public static void main(String[]args)throws Exception
    {
        Scanner scanReader = new Scanner(System.in);
        String password = "";
        boolean firstLoop = true;
        int length = 0;
        int passwordLength = 0;
        int countCaps = 0;
            System.out.println("This was made by Sean McGlone");
            System.out.print("Please enter a password consisting of 12 characters to be checked for validity:  ");
                password = scanReader.nextLine ();
                passwordLength = password.length ();
        do
        {
            try
            {
                if (passwordLength == 12)
                { 
                    System.out.println("Your pasword meets the length requirements");
                }
                    else
                    {
                        throw new Exception ();
                    }
            }
                catch (Exception ex)
            {
                System.out.println("Please enter a valid password consisting of 12 characters:  ");
                password = scanReader.nextLine ();
            }
        }
        while (firstLoop = true);
    }
}

When I run this code the loop keeps reiterating even if a 12 character word is input. The loop keeps saying to please reenter a valid password. Can someone please help?

Thanks
Sean

Hint: == != =

And even when you fix that, when do you set firstLoop to false?

It looks like firstloop is never set to false.

Great way for an infinite loop.

Also, it's

while (firstLoop == true)

anyway.

it should be while(firstLoop){} because that helps avoid the assignment error that is present.

How about this:

boolean firstLoop = false;
           while (firstLoop != true)
{
            try
            {
password = scanReader.nextLine ();
                passwordLength = password.length ();
                if (passwordLength == 12)
                {
                    System.out.println("Your pasword meets the length requirements");
firstLoop = true;
                }
                    else
                    {
                        throw new Exception ();
firstLoop = false;
                    }
            }
                catch (Exception ex)
            {
                System.out.println("Please enter a valid password consisting of 12 characters:  ");
 
            }
        }