updated hello example

Author: scmacdon

javav2/example_code/location/src/main/java/com/example/location/HelloLocation.java

@@ -49,7 +49,21 @@ private static LocationAsyncClient getClient() {
     }
 
     public static void main(String[] args) {
-        String colletionName = "ScottCollection30";
+        final String usage = """
+
+            Usage:
+                <colletionName>
+
+            Where:
+                colletionName - The Amazon location collection name. 
+            """;
+
+        if (args.length != 1) {
+            System.out.println(usage);
+            System.exit(1);
+        }
+
+        String colletionName = args[0];
         listGeofences(colletionName);
     }
 

javav2/example_code/location/src/main/java/com/example/location/scenario/LocationScenario.java

@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: Apache-2.0
 
 package com.example.location.scenario;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import java.util.Scanner;