Question

CSC-295 Spring 2019

Assignment – String, StringBuilder and StringBuffer

Write an application that prompts the user for a password that contains at least two uppercase letters, at least three lowercase letters, and at least one digit. Continuously reprompt the user until a valid password is entered. Display Valid password if the password is valid; if not, display the appropriate reason(s) the password is not valid as follows:

The password did not have enough of the following:

uppercase letters

lowercase letters

digits

Answer 1

CODE

import java.util.Scanner;

public class Main {

public static boolean containsTwoUppercase(String s) {

int count = 0;

for (char ch : s.toCharArray()) {

if (ch >= 'A' && ch <= 'Z') {

count ++;

}

}

return (count >= 2);

}

public static boolean containsThreeLowercase(String s) {

int count = 0;

for (char ch : s.toCharArray()) {

if (ch >= 'a' && ch <= 'z') {

count ++;

}

}

return (count >= 3);

}

public static boolean containsOneDigit(String s) {

int count = 0;

for (char ch : s.toCharArray()) {

if (ch >= '0' && ch <= '9') {

count ++;

}

}

return (count >= 1);

}

public static boolean isValidPassword(String s) {

if (!containsOneDigit(s)) {

System.out.println("The password does not contain a digit!!");

return false;

}

if (!containsThreeLowercase(s)) {

System.out.println("The password does not contain atleast 3 lowercase letters!!");

return false;

}

if (!containsTwoUppercase(s)) {

System.out.println("The password does not contain atleast 2 uppercase letters!!");

return false;

}

return true;

}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

while (true) {

String password;

System.out.println("Enter the password: ");

password = sc.nextLine();

if (isValidPassword(password)) {

System.out.println("Valid password!!");

break;

}

}

}

}