Add unique Java Lambda Expression Utilities

Author: Farheen Shabbir Shaikh

Functional/LambdaExpressionUtils.java

@@ -0,0 +1,37 @@
+/**
+ * LambdaExpressionUtils.java
+ * Unique Java utility functions using Lambda expressions.
+ * Demonstrates Function, Predicate, Consumer, and Supplier.
+ */
+
+import java.util.Random;
+import java.util.function.*;
+
+public class LambdaExpressionUtils {
+
+    public static void main(String[] args) {
+        // Reverse a string
+        Function<String, String> reverse = str -> new StringBuilder(str).reverse().toString();
+        System.out.println("Reversed: " + reverse.apply("lambda"));
+
+        // Check palindrome
+        Predicate<String> isPalindrome = str -> str.equalsIgnoreCase(new StringBuilder(str).reverse().toString());
+        System.out.println("Is Palindrome: " + isPalindrome.test("madam"));
+
+        // Print message in all caps with exclamation
+        Consumer<String> shout = s -> System.out.println(s.toUpperCase() + "!");
+        shout.accept("functional interface");
+
+        // Check if number is even
+        Function<Integer, Boolean> isEven = n -> n % 2 == 0;
+        System.out.println("Is 10 even? " + isEven.apply(10));
+
+        // Get random greeting
+        Supplier<String> randomGreeting = () -> {
+            String[] greetings = {"Hello", "Hi", "Hey", "Hola"};
+            return greetings[new Random().nextInt(greetings.length)];
+        };
+        System.out.println("Random Greeting: " + randomGreeting.get());
+    }
+    
+}