Password validation ( boolean methode)

Question

1.00/5 (1 vote)

See more:

write a Boolean method which gets a string and verify if it has at least 10 character , one uppercase , one lowercase , one number, and only alphanumeric, and return Boolean true or false , in the main method we can check the answer

What I have tried:

Java

import java.util.Scanner;
public class PasswordValidator {
  public static void main (String[] args){
    Scanner input= new Scanner (System.in);
    //System.out.println
      boolean answer1 =(isSecurePassword( input.nextLine()));
      System.out.println(answer1);
    /*String pass1 = "This is a secure password";
    String pass2 = "This is not a secure password";
    
    boolean answer1 = isSecurePassword(pass1);
    boolean answer2 = isSecurePassword(pass2);
    
    System.out.println("answer1 = " + answer1);
    System.out.println("answer2 = " + answer2);*/

    
  }
  public static boolean isSecurePassword (String password){
  
   
    int i;
    for (i=0;i<password.length();i++){
      
    if (i!=10)
    {
   
    return false;
    
    }
    
      
  }
  
  }
}

Posted 13-Feb-18 6:12am

Member 13676546

Updated 13-Feb-18 22:42pm

Patrice T

v3

Add a Solution

2 solutions

Solution 1

Read the question: it's makes it pretty obvious what you have to do.
1) Read in the string.
2) Check it has 10 characters. If it doesn't, return false.
3) Declare three boolean variables: hasUpperCase, hasLowerCase, hasDigit and set them all to false.
4) Loop through the string, looking at each character in turn.
4.1) If it's Uppercase, set hasUpperCase to true.
4.2) Otherwise, if it's lowercase, set hasLowerCase to true.
4.3) Otherwise, if it's a digit, set hasDigit to true.
4.4) Otherwise, return false;
5) After the loop, return hasUpperCase AND hasLowerCase AND hasDigit

Posted 13-Feb-18 6:20am

OriginalGriff

Comments

Member 13676546 13-Feb-18 13:13pm

thanks for the explanation . when I compile the first part which is check if it has 10 character it gives a message that it must return Boolean type .. so I still stuck in the fist part of the question..

OriginalGriff 13-Feb-18 14:00pm

That's because you aren't doing what I suggested: look at your code and mentally follow it through (or use the debugger) - it's fundamentally flawed if you look at all closely.

OriginalGriff 14-Feb-18 5:58am

I was going to say "what errors?" but then I read the code ... oh dear ...

Stop guessing. Start thinking. Go back to what I originally said, and read it again. Is that what you are doing?
Hint: https://stackoverflow.com/questions/2451650/how-do-i-apply-the-for-each-loop-to-every-character-in-a-string

Member 13676546 14-Feb-18 8:32am

thanks for the link, however, I'm beginner, and I just learnt conditional loop and a bit of string very basics.. not anything else, the goal of the exercise is to write a method and call it. we can not use scanner in the method but we ca verify the result ( which should be Boolean type) through the main method. so I need to write a program to validate a password with the basics.

OriginalGriff 14-Feb-18 8:39am

You need to access each character individually to find out what kind of character it is: that means a loop and either a "for each" construct or an array index - as the link shows.
I suggest that you look back through your course notes and see what loops you have been introduced to: without one you can't do the exercise so I suspect you have just skipped over them when you were in class for some reason.

Member 13676546 14-Feb-18 8:53am

I have not learnt array yet. and your guess is not correct. I have studied the topic and I know since it is new I need to practice more to grasp the concepts. I'm also here to get help in my coding not being judged.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CPallini · Accepted Answer · 2018-02-13T22:42:00

Yor implementation (the one in the comment) is full of bugs. Hopefully I've fixed all of them. Try