Password_Strength_Checker.java

import java.util.Scanner;

public class Password_Strength_Checker {
    public static String checkStrength(String password) {
        int length = password.length();
        boolean hasUpper = false, hasLower = false, hasDigit = false, hasSpecial = false;
        
        for (char ch : password.toCharArray()) {
            if (Character.isUpperCase(ch)) hasUpper = true;
            else if (Character.isLowerCase(ch)) hasLower = true;
            else if (Character.isDigit(ch)) hasDigit = true;
            else hasSpecial = true;
        }
        
        if (length >= 12 && hasUpper && hasLower && hasDigit && hasSpecial) {
            return "Strong password";
        } else if (length >= 8 && ((hasUpper && hasLower) || (hasDigit && hasSpecial))) {
            return "Moderate password";
        } else {
            return "Weak password";
        }
    ]

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a password to check its strength: ");
        String password = scanner.nextLine();
        
        System.out.println("Password Strength: " + checkStrength(password));
        
        scanner.close();
    }
}