Question

Please help me with this program in Java: Write a Java program that prompts the user to enter a password that matches a specific pattern. Your program must approve the user's entry.. Here is the pattern, in this order: 1 or more upper case letters two lower case letters 1 or 2 digits zero or 1 upper case letters any two of this group @#$%^&

Answer 1

Here is the code for you:

import java.util.*;
class PasswordEvaluator
{
//Here is the pattern, in this order:
//1 or more upper case letters
//two lower case letters
//1 or 2 digits
//zero or 1 upper case letters
//any two of this group @#$%^&
public static boolean isValid(String password)
{
String symbol = "@#$%^&";
boolean accepted = false;
//boolean hasLength = false;
int upperCaseCount = 0;
int lowerCaseCount = 0;
int digitCount = 0;
int symbolCount = 0;
for(int i = 0; i < password.length(); i++) //For each character.
{
char c = password.charAt(i);
if(Character.isUpperCase(c))        //If uppercase, increment counter.
upperCaseCount++;
if(Character.isLowerCase(c)) //If lowercase, increment counter.
lowerCaseCount++;
if(Character.isDigit(c))            //If digit, increment counter.
digitCount++;
if(symbol.indexOf(c) != -1)       //If has symbol, mark flag.
symbolCount++;   
}
  
{
if(upperCaseCount < 1)
{
System.out.println("Password should contain 1 or more uppercase letter.");
return false;
}
if(symbolCount != 2)
{
System.out.println("Password should contain any two of special characters from @, #, $, %, ^, &");
return false;
}
if(lowerCaseCount != 2)
{
System.out.println("Password should contain 2 lowercase letter.");
return false;
}
if(digitCount != 2 && digitCount != 2)
{
System.out.println("Password should contain 1 or 2 digits.");
return false;
}
return true;
}
}
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
while(true) {
//System.out.print("Do you want detailed information on failure or not...? ");
System.out.print("Choose (Y)es or (N)o...: ");
char c = (in.next()).charAt(0);
System.out.println("Enter your password.....");
System.out.println("Should contain one or more Uppercase letter, two lowercase letter");
System.out.print("1 or 2 digits, any two of the following symbol @, #, $, %, ^, & : ");
String password = in.next();
boolean flag = isValid(password);
if(flag)
System.out.println("The password is Acceptable.");
else
System.out.println("The password is not Acceptable. Its easy to guess.");
System.out.println("Do you want to continue checking for another password...? ");
System.out.print("Choose (Y)es or (N)o...: ");
c = (in.next()).charAt(0);
if(c != 'N' && c != 'n')
continue;
return;
}
}
}

And the output screenshot is: