Answer:
Here's an example Java 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. The program continuously reprompts the user until a valid password is entered, and displays a message indicating whether the password is valid or not, along with the reason why it's not valid:
import java.util.Scanner;
public class ValidatePassword {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String password;
boolean hasUppercase = false;
boolean hasLowercase = false;
boolean hasDigit = false;
do {
System.out.print("Enter a password that contains at least 2 uppercase letters, 3 lowercase letters, and 1 digit: ");
password = input.nextLine();
for (int i = 0; i < password.length(); i++) {
if (Character.isUpperCase(password.charAt(i))) {
hasUppercase = true;
} else if (Character.isLowerCase(password.charAt(i))) {
hasLowercase = true;
} else if (Character.isDigit(password.charAt(i))) {
hasDigit = true;
}
}
if (password.length() < 6) {
System.out.println("The password is too short.");
} else if (!hasUppercase) {
System.out.println("The password must contain at least 2 uppercase letters.");
} else if (!hasLowercase) {
System.out.println("The password must contain at least 3 lowercase letters.");
} else if (!hasDigit) {
System.out.println("The password must contain at least 1 digit.");
}
hasUppercase = false;
hasLowercase = false;
hasDigit = false;
} while (password.length() < 6 || !hasUppercase || !hasLowercase || !hasDigit);
System.out.println("The password is valid.");
}
}
When you run this program, it will prompt the user to enter a password that meets the specified criteria. If the password is not valid, the program will display a message indicating the reason why it's not valid and prompt the user to enter a new password. The program will continue to reprompt the user until a valid password is entered. Once a valid password is entered, the program will display a message indicating that the password is valid.
I hope this helps!
Step-by-step explanation: