rolled in review comments

Author: scmacdon

javav2/example_code/s3/src/main/java/com/example/s3/lockscenario/CreateObjectLockRole.java

@@ -11,17 +11,28 @@
 
 public class CreateObjectLockRole {
     public static void main(String[] args) {
-        createLockRole();
+        final String usage = """
+
+            Usage:    <roleName>
+
+            Where:
+               roleName - the IAM role name.
+            """;
+
+        if (args.length != 1) {
+            System.out.println(usage);
+            System.exit(1);
+        }
+        String roleName = args[0];
+        createLockRole(roleName);
     }
 
     // snippet-start:[S3Lock.javav2.lock.role.main]
 
     /**
      * Creates an IAM role for AWS S3 Batch Operations to manage object locks.
      */
-    public static void createLockRole() {
-        final String roleName = "batch_operations-object-lock1";
-
+    public static void createLockRole(String roleName) {
         // Trust policy
         final String trustPolicy = """
             {