Question

USING JAVA

Having a secure password is a very important practice when much of our information is stored online. Write a program that validates a new password, following these rules:

• The password must be at least 10 characters long.
• The password must have a least two uppercase and at least one lowercase letter
• The password must have at least one digit

Write a program that asks for a password, then asks again to confirm it. If passwords don't match or the rules are not fulfilled, prompt again. Your program should include a method that checks whether a password is valid. Include javaDoc comments for all your methods.

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
=================================

// PasswordValidator.java

import java.util.Scanner;
public class PasswordValidator {
public static void main(String[] args) {
//Declaring variable
String str = null;
  
// Scanner object is used to get the inputs entered by the user
Scanner sc = new Scanner(System.in);

//This loop continue to execute until the user enters a valid password
while(true)
{


System.out.print("\nEnter a new password :");
str = sc.nextLine();
  
if(isValidPassword(str))
{
   System.out.println("Password is valid");
   break;
}

}

}
  
  
private static boolean isValidPassword(String str) {
   int count=0;
     
   if(AtLeast10(str))
{
//Displaying the error message
System.out.println("Invalid: Too Few Characters (10 at least)");
count++;
// continue;
}
if(!containsLowerCase(str))
{
System.out.println("Invalid:Contains at least 1 lower letter character");
// continue;
count++;
}
if(!containsUpperCase(str))
{
System.out.println("Invalid:Contains at least 2 upper letter character");
// continue;
count++;
}

/* checking whether the password contains letter or digit by calling the method
* if yes,then this block of code get executed and display
* error message and prompt the user to enter again
*/
if (!containsDigit(str)) {

//Displaying the error message
System.out.println("Invalid: Contains at least 1 numeric digit");
// continue;
count++;

}

if(count==0)
return true;
else
return false;
   }
  
private static boolean containsDigit(String str) {
int count=0;
for(int i=0;i<str.length();i++)
{
if(Character.isDigit(str.charAt(i)))
{
count++;
}
}
if(count>=1)
return true;
else
return false;
}
private static boolean containsUpperCase(String str) {
int count=0;
for(int i=0;i<str.length();i++)
{
if(Character.isUpperCase(str.charAt(i)))
{
count++;
}
}
if(count>=2)
return true;
else
return false;
}
private static boolean containsLowerCase(String str) {
int count=0;
for(int i=0;i<str.length();i++)
{
if(Character.isLowerCase(str.charAt(i)))
{
count++;
}
}
if(count>=1)
return true;
else
return false;
}
  
/* This method will check whether the password length
* is atleast 8 or not
* Params : String
* Return : boolean
*/
private static boolean AtLeast10(String str) {
if(str.length()<8)
return true;
else
return false;
}
  
}

========================================

Output:

Enter a new password :Hello
Invalid: Too Few Characters (10 at least)
Invalid:Contains at least 2 upper letter character
Invalid: Contains at least 1 numeric digit

Enter a new password :hello
Invalid: Too Few Characters (10 at least)
Invalid:Contains at least 2 upper letter character
Invalid: Contains at least 1 numeric digit

Enter a new password :HEllo
Invalid: Too Few Characters (10 at least)
Invalid: Contains at least 1 numeric digit

Enter a new password :HELLOBOSS
Invalid:Contains at least 1 lower letter character
Invalid: Contains at least 1 numeric digit

Enter a new password :Helloboss
Invalid:Contains at least 2 upper letter character
Invalid: Contains at least 1 numeric digit

Enter a new password :HelloBoss
Invalid: Contains at least 1 numeric digit

Enter a new password :HelloBoss123
Password is valid

=====================Could you plz rate me well.Thank You