Add ReverseString.java with comments and examples #2860

Java/ReverseString.java

@@ -0,0 +1,43 @@
+// File name: ReverseString.java
+import java.util.Scanner;
+
+public class ReverseString {
+
+    // Function to reverse a given string
+    public static String reverseString(String str) {
+        // Using StringBuilder to reverse the string
+        return new StringBuilder(str).reverse().toString();
+    }
+
+    public static void main(String[] args) {
+        // Step 1: Create Scanner object to read input from user
+        Scanner sc = new Scanner(System.in);
+
+        // Step 2: Prompt the user to enter a string
+        System.out.print("Enter a string to reverse: ");
+        String input = sc.nextLine(); // Read input
+
+        // Step 3: Call the reverseString function
+        String reversed = reverseString(input);
+
+        // Step 4: Print the reversed string
+        System.out.println("Reversed string: " + reversed);
+
+        // Step 5: Close Scanner
+        sc.close();
+    }
+}
+
+/*
+Example Usage:
+
+Input:
+    Enter a string to reverse: Hacktoberfest
+Output:
+    Reversed string: tsefrebotkcaH
+
+Input:
+    Enter a string to reverse: Hello World
+Output:
+    Reversed string: dlroW olleH
+*/