Implement Reverse String Function in Java

Java/ReverseString.java

@@ -0,0 +1,36 @@
+import java.util.Scanner;
+
+public class ReverseString {
+
+    /*
+     * This method takes a string as input
+     * and returns the reversed version of it.
+     * Example:
+     *   Input  : "hello"
+     *   Output : "olleh"
+     */
+    public static String reverse(String input) {
+        if (input == null) {
+            return null;
+        }
+
+        // Using StringBuilder for efficient reversal
+        return new StringBuilder(input).reverse().toString();
+    }
+
+    public static void main(String[] args) {
+
+        // Scanner is used to take user input from the console
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter a string to reverse: ");
+        String userInput = sc.nextLine();   // Taking complete line as input
+
+        String reversed = reverse(userInput);  // Calling the reverse method
+
+        System.out.println("Reversed String: " + reversed);
+
+        sc.close(); // Closing the scanner (good practice)
+    }
+}
+