remove java code from scala snippet

web/concurrency.textile

@@ -427,17 +427,17 @@ A common pattern for async computation is to separate producers from consumers a
 import java.util.concurrent.{BlockingQueue, LinkedBlockingQueue}
 
 // Concrete producer
-class Producer[T](path: String, queue: BlockingQueue[T]) implements Runnable {
-  public void run() {
+class Producer[T](path: String, queue: BlockingQueue[T]) extends Runnable {
+  def run() {
     Source.fromFile(path, "utf-8").getLines.foreach { line =>
       queue.put(line)
     }
   }
 }
 
 // Abstract consumer
-abstract class Consumer[T](queue: BlockingQueue[T]) implements Runnable {
-  public void run() {
+abstract class Consumer[T](queue: BlockingQueue[T]) extends Runnable {
+  def run() {
     while (true) {
       val item = queue.take()
       consume(item)