Thread: Stuck, and i need this to be solved within 2 days.

SO i was given this mini project but im stuck. (manage to get an extension for another three days)
(To run in command prompt only)

Ive searched high and low for the codes and tips but i could seem to find any useful ones. even if i did, i wont know how and where to apply them.



these are the criteria needed the this user and pass :
(completed)--> User id should be at least 6 characters long, no digit is allowed.

(incomplete)--> User’s password should be at least 6 alphanumeric long and contains at least one uppercase and at least one lowercase letter.(using if (Charcter.isLetter(yourCharacter)) and if(Character.isDigit(yourCharacter)))

(Completed)--> User’s password should have at least one digit number but password shouldn’t be started up with digit.(using if(Character.isLowerCase(yourCharacter)) and if(Character.isUpperCase(yourCharacter)))

MY problem
--> i have no idea where to insert those codes at all. It my first "mini project" with such little knowledge that i have.


SO far, this is what i got...: (could anyone help me out here?)

import java.util.Scanner;
 
public class Assign3{
public static void main (String [] args){
 Scanner input = new Scanner(System.in);
 
	//call the method
 
		System.out.println("Welcome to Amazon.com");
		System.out.println("\nPress ENTER to continue");
		String letters = input.nextLine();
 
 
		System.out.println("Criteria");
		System.out.println();
		System.out.println("Criteria For ID: \n1.must be at least 6 characters long. \n2.in alphabets only.");
		System.out.println();
		System.out.println("Criteria For Password: \n1.at least 6 alphanumeric long and contains at least one uppercase and at least one lowercase letter. \n2.at least one digit number but password shouldn’t be started up with digit.");
		System.out.println();
 
 
	//ID 
		String user_id = enterUserID();
		while(!checkUserID(user_id)){
		System.out.println("ID does not matches the criteria.Please re-enter");
		user_id = enterUserID();
		}
 
	//Pass
		String user_pa = enterUserPA();
		while(!checkUserPA(user_pa)){
		System.out.println("PASSWORD does not matches the criteria.Please re-enter");
		user_pa = enterUserPA();
		}
 
	//Accept
		System.out.println("ID and PASSWORD is accepted.");
		}
 
	//Entering userID
		public static String enterUserID(){
        String user_id;
        Scanner input = new Scanner(System.in);
        System.out.print("ID: ");
        user_id = input.nextLine();
        return user_id;
        }
 
	//Entering userPA
		public static String enterUserPA(){
        String user_pa;
        Scanner input = new Scanner(System.in);
        System.out.print("Password: ");
        user_pa = input.nextLine();
        return user_pa;
        }
 
 
	//ID check
		 public static boolean checkUserID(String user_id){
        int length;
        length = user_id.length();
            if (length < 6 || length > 99999){
            return false;
            }
        for (int i = 0; i < user_id.length();i++){
            if (!Character.isLetter(user_id.charAt(i)))
            return false;
        }
        return true;
        }
 
	//PA check
		 public static boolean checkUserPA(String user_pa){
        int length;
 
        length = user_pa.length();
            if (length < 6 || length > 99999){
            return false;
            }
       for(int i = 0; i < user_pa.length();i++){
 for(int i = 0; i < user_pa.length();i++){
	   if(Character.isDigit(user_pa.charAt(0)))
		if(!Character.isLetter(user_pa.charAt(i)))
		if(Character.isUpperCase(user_pa.charAt(0)))
		if(Character.isLowerCase(user_pa.charAt(0)))
            return false;
        }
        return true;
        }
		}

You give us things we don't need: a due date, you give us some requirements and some code (unformatted), but you don't ask a specific answerable question, one that tells us where you're stuck exactly. Please fix this so we can help you better.

okay. done =)

You have to check the ID and password for case and alphanumeric:

A useful Java method isLetterOrDigit
Character (Java Platform SE 7 )

Some people prefer regex, which searches for a particular pattern.

There's also one in the Character class called isLowerCase()

Always try and check the API in case there is something already available.

thanks for having a look at my thread and using that time that you have to help me out.
as you can see, i have very little knowledge on java. Im more of a visual learner. So if you could give examples on how the codes are suppose to look like, then there is a high possibility i could get this done.

especially this last part. I just couldn't get it right.

 for(int i = 0; i < user_pa.length();i++){
	   if(Character.isDigit(user_pa.charAt(0)))
		if(!Character.isLetter(user_pa.charAt(i)))
		if(Character.isUpperCase(user_pa.charAt(0)))
		if(Character.isLowerCase(user_pa.charAt(0)))
            return false;
        }
        return true;
        }
		}

--- Update ---

Originally Posted by Starstreak

You have to check the ID and password for case and alphanumeric:

A useful Java method isLetterOrDigit
Character (Java Platform SE 7 )

Some people prefer regex, which searches for a particular pattern.

There's also one in the Character class called isLowerCase()

Always try and check the API in case there is something already available.

Thank you for using what little time you have to take a look at my thread. REally appreciate that help. by the way I just need it to be able to run in command prompt without any errors. thats all. im a novice at JAVA.

Originally Posted by Chris.Brown.SPE

So your code works except for the password check. It is close but has some inherit errors. I've worked through it on my end and will help you along. I would suggest deleting that for loop in the checkUserPA function and starting over on it. Go step by step on what you need to check and make sure each piece is returning the right value.

this is the latest update i have for the PA check section. i still cant get it right especially for the arrays for alphanumeric and at least one uppercase and one lowercase letter.

//PA check
		 public static boolean checkUserPA(String user_pa){
        int length;
		char [] chr = user_pa.toCharArray();
 
        length = user_pa.length();
 
            if (length < 6 || length > 99999){
            return false;
            }
       for(int i = 0; i < user_pa.length();i++){
	   if(Character.isDigit(user_pa.charAt(0)))
		if(!Character.isLetter(user_pa.charAt(i)))
		 if(!Character.isUpperCase(user_pa.charAt(chr)))
            return false;
        }
        return true;
        }
		}