Question

2. Write a Java program to read a string (a password)from the user and then

  check that the password conforms to the corporate password policy.

  The policy is:

  1) the password must be at least 8 characters

  2) the password must contain at least two upper case letters

  3) the password must contain at least one digit

  4) the password cannot begin with a digit

  Use a for loop to step through the string.

  Output “Password OK” if the password conforms, otherwise

  output “Password does not conform to the policy.”

*****IN JAVA**********

Answer 1

Hi, Please find java code for given problem statement below:

import java.util.Scanner;
public class Main{
        public static void main(String[] args) {
            
            int passwordLength = 0, upperCaseCharacterCount = 0;
            boolean isDigitPresent = false,isBeginWithDigit = false;
            
            //Accepting password from user
            Scanner sc = new Scanner(System.in);
                System.out.print("Enter password : ");
                String password = sc.nextLine();  
                
                //Checking password given conditions.
                for (int i =0 ; i<password.length(); i++){
                    ++passwordLength;
                    char ch = password.charAt(i);
                    if (i == 0 && Character.isDigit(ch)){
                        isBeginWithDigit = true;
                        break;
                    }
                    if (Character.isUpperCase(ch))
                        ++upperCaseCharacterCount;
                    if (Character.isDigit(ch))
                        isDigitPresent = true;
                }
                //If all password conditions are true then print password OK
                if (passwordLength >= 8 && isDigitPresent && upperCaseCharacterCount >=2 && !isBeginWithDigit)
                        System.out.print("Password OK");
                else
                    System.out.println("Password does not conform to the policy");
        }
}

Also find screenshot of above code and its output for better understanding and indentation. Also have a look on comments as well

Output

Explanation:

• First, program declare some variables which is used to track characters in entered password.
• Then user is asked to enter the password using scanner class object.
• After that program uses for loop to iterate over the characters of the entered password.
• In for loop, program calculates the number of characters, checking if password contains digit, counting number of uppercase letters and checking if first character is digit.
• After coming out of for loop, values of various computed varables is compared and if all conditions get satisfied then print Password OK else print Password does not conform to the policy.