Fix style on DeferSampleServlet

Author: Bill Prin

taskqueue/deferred/src/main/java/com/google/cloud/taskqueue/samples/DeferSampleServlet.java

@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+/**
+ * This package demonstrates how to use the task queue with Java.
+ */
 package com.google.cloud.taskqueue.samples;
 
 import javax.servlet.http.HttpServlet;
@@ -33,7 +36,15 @@
  */
 public class DeferSampleServlet extends HttpServlet {
 
+    /**
+     * Number of ms long we will arbitrarily delay.
+     */
+    static final int DELAY_MS = 5000;
+
     //[START defer]
+    /**
+     * A hypothetical expensive operation we want to defer on a background task.
+     */
     public static class ExpensiveOperation implements DeferredTask {
         @Override
         public void run() {
@@ -42,6 +53,11 @@ public void run() {
         }
     }
 
+    /**
+     * Basic demonstration of adding a deferred task.
+     * @param request servlet request
+     * @param resp servlet response
+     */
     @Override
     public void doGet(HttpServletRequest request, HttpServletResponse
             resp) throws IOException {
@@ -50,7 +66,7 @@ public void doGet(HttpServletRequest request, HttpServletResponse
 
         // Wait 5 seconds to run for demonstration purposes
         queue.add(TaskOptions.Builder.withPayload(new ExpensiveOperation())
-                .etaMillis(System.currentTimeMillis() + 5000));
+                .etaMillis(System.currentTimeMillis() + DELAY_MS));
 
         resp.setContentType("text/plain");
         resp.getWriter().println("Task is backgrounded on queue!");