Create Utility.java

Utility.java

@@ -0,0 +1,67 @@
+import java.util.regex.Pattern;
+
+public class Utility {
+
+    private static final String EMAIL_REGEX = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$";
+    private static final Pattern EMAIL_PATTERN = Pattern.compile(EMAIL_REGEX);
+
+
+    public static boolean isValidEmail(String email) {
+        return EMAIL_PATTERN.matcher(email).matches();
+    }
+
+
+    public static int add(int a, int b) {
+        return a + b;
+    }
+
+
+    public static int divide(int a, int b) {
+        if (b == 0) {
+            System.out.println("Warning: Division by zero. Returning 0 instead.");
+            return 0;
+        }
+        return a / b;
+    }
+
+
+    public static double calculateDiscountedPrice(double price, double discount) {
+        double discountedPrice = price - (price * discount / 100);
+        return discountedPrice;
+    }
+
+   public static String reverseString(String input) {
+        if (input == null) {
+            System.out.println("Warning: Input is null. Returning null.");
+            return null; 
+        }
+        return new StringBuilder(input).reverse().toString();
+    }
+
+  public static long factorial(int n) {
+        if (n < 0) {
+            System.out.println("Warning: Factorial of negative number. Returning -1.");
+            return -1;
+        }
+        long result = 1;
+        for (int i = 1; i <= n; i++) {
+            result *= i;
+        }
+        return result;
+    }
+
+  public static int findMax(int[] numbers) {
+        if (numbers == null || numbers.length == 0) {
+            System.out.println("Warning: Input array is null or empty. Returning Integer.MIN_VALUE.");
+            return Integer.MIN_VALUE; 
+        }
+
+        int max = numbers[0];
+        for (int number : numbers) {
+            if (number > max) {
+                max = number;
+            }
+        }
+        return max;
+    }
+}