Use java.util.function.Consumer for event listener.

java/src/edu/wpi/cscore/CameraServerJNI.java

@@ -13,6 +13,7 @@ import java.io.OutputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.ByteBuffer;
+import java.util.function.Consumer;
 import org.opencv.core.Core;
 
 public class CameraServerJNI {
@@ -164,7 +165,7 @@ public class CameraServerJNI {
   //
   // Listener Functions
   //
-  public static native int addListener(VideoListenerFunction listener,
+  public static native int addListener(Consumer<VideoEvent> listener,
                                        int eventMask, boolean immediateNotify);
 
   public static native void removeListener(int handle);

java/src/edu/wpi/cscore/VideoListener.java

@@ -7,6 +7,8 @@
 
 package edu.wpi.cscore;
 
+import java.util.function.Consumer;
+
 /// An event listener.  This calls back to a desigated callback function when
 /// an event matching the specified mask is generated by the library.
 public class VideoListener {
@@ -15,7 +17,7 @@ public class VideoListener {
   /// @param eventMask Bitmask of VideoEvent.Type values
   /// @param immediateNotify Whether callback should be immediately called with
   ///        a representative set of events for the current library state.
-  public VideoListener(VideoListenerFunction listener, int eventMask,
+  public VideoListener(Consumer<VideoEvent> listener, int eventMask,
                        boolean immediateNotify) {
     m_handle = CameraServerJNI.addListener(listener, eventMask, immediateNotify);
   }

java/src/edu/wpi/cscore/VideoListenerFunction.java

@@ -1,12 +0,0 @@
-/*----------------------------------------------------------------------------*/
-/* Copyright (c) FIRST 2016. All Rights Reserved.                             */
-/* Open Source Software - may be modified and shared by FRC teams. The code   */
-/* must be accompanied by the FIRST BSD license file in the root directory of */
-/* the project.                                                               */
-/*----------------------------------------------------------------------------*/
-
-package edu.wpi.cscore;
-
-public interface VideoListenerFunction {
-  void apply(VideoEvent event);
-}