Create PasswordSuperStrengthChecker.java

Java/strings/PasswordSuperStrengthChecker.java

@@ -0,0 +1,67 @@
+//PasswordStrengthChecker
+
+import java.util.Scanner;
+import java.util.regex.*;
+
+public class PasswordStrengthChecker {
+
+    // Checkpassword strength and return score
+    public static int checkStrength(String password) {
+        int score = 0;
+
+        // Length checkk
+        if (password.length() >= 8) score++;
+
+        // Uppercasee + lowercase
+        if (password.matches(".*[A-Z].*") && password.matches(".*[a-z].*")) score++;
+
+        // Numberrs
+        if (password.matches(".*[0-9].*")) score++;
+
+        // Special characterrs
+        if (password.matches(".*[!@#$%^&*()_+\\-=\\[\\]{};:'\",.<>/?].*")) score++;
+
+        // Extraa strong if >= 12 chars
+        if (password.length() >= 12) score++;
+
+        return score;
+    }
+
+    // Suggesimprovement
+    public static void suggestImprovements(String password) {
+        if (password.length() < 8) 
+            System.out.println("- Use at least 8 characters");
+        if (!password.matches(".*[A-Z].*")) 
+            System.out.println("- Add at least one uppercase letter");
+        if (!password.matches(".*[a-z].*")) 
+            System.out.println("- Add at least one lowercase letter");
+        if (!password.matches(".*[0-9].*")) 
+            System.out.println("- Add at least one number");
+        if (!password.matches(".*[!@#$%^&*()_+\\-=\\[\\]{};:'\",.<>/?].*")) 
+            System.out.println("- Add at least one special character (!@#$%^&*)");
+    }
+
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter a password to check: ");
+        String password = sc.nextLine();
+
+        int strength = checkStrength(password);
+
+        System.out.println("\nPassword Strength Score: " + strength + "/5");
+
+        switch (strength) {
+            case 0, 1 -> System.out.println("Strength: Very Weakness ❌");
+            case 2 -> System.out.println("Strength: Weak ⚠️");
+            case 3 -> System.out.println("Strength: Moderate ✅");
+            case 4 -> System.out.println("Strength: Strong 💪");
+            case 5 -> System.out.println("Strength: Super Strong 🔥");
+        }
+
+        if (strength < 5) {
+            System.out.println("\nSuggestions to improve your password:");
+            suggestImprovements(password);
+        }
+    }
+}