src/share/classes/java/nio/file/WatchService.java

@@ -101,17 +101,13 @@
  * @since 1.7
  *
  * @see FileSystem#newWatchService
  */
 
-public abstract class WatchService
-    implements Closeable
+public interface WatchService
+    extends Closeable
 {
-    /**
-     * Initializes a new instance of this class.
-     */
-    protected WatchService() { }
 
     /**
      * Closes this watch service.
      *
      * <p> If a thread is currently blocked in the {@link #take take} or {@link

@@ -127,11 +123,11 @@
      *
      * @throws  IOException
      *          if an I/O error occurs
      */
     @Override
-    public abstract void close() throws IOException;
+    void close() throws IOException;
 
     /**
      * Retrieves and removes the next watch key, or {@code null} if none are
      * present.
      *

@@ -138,11 +134,11 @@
      * @return  the next watch key, or {@code null}
      *
      * @throws  ClosedWatchServiceException
      *          if this watch service is closed
      */
-    public abstract WatchKey poll();
+    WatchKey poll();
 
     /**
      * Retrieves and removes the next watch key, waiting if necessary up to the
      * specified wait time if none are yet present.
      *

@@ -158,11 +154,11 @@
      *          if this watch service is closed, or it is closed while waiting
      *          for the next key
      * @throws  InterruptedException
      *          if interrupted while waiting
      */
-    public abstract WatchKey poll(long timeout, TimeUnit unit)
+    WatchKey poll(long timeout, TimeUnit unit)
         throws InterruptedException;
 
     /**
      * Retrieves and removes next watch key, waiting if none are yet present.
      *

@@ -172,7 +168,7 @@
      *          if this watch service is closed, or it is closed while waiting
      *          for the next key
      * @throws  InterruptedException
      *          if interrupted while waiting
      */
-    public abstract WatchKey take() throws InterruptedException;
+    WatchKey take() throws InterruptedException;
 }