--- a/src/java.base/share/classes/java/net/AbstractPlainDatagramSocketImpl.java	Fri Oct 18 17:08:59 2019 +0100
+++ b/src/java.base/share/classes/java/net/AbstractPlainDatagramSocketImpl.java	Fri Oct 18 21:25:01 2019 +0100
@@ -46,7 +46,9 @@
  * @author Pavani Diwanji
  */
 
-abstract class AbstractPlainDatagramSocketImpl extends PlatformDatagramSocketImpl
+abstract class AbstractPlainDatagramSocketImpl
+    extends DatagramSocketImpl
+    implements PlatformDatagramSocketImpl
 {
     /* timeout value for receive() */
     int timeout;

--- a/src/java.base/share/classes/sun/net/PlatformDatagramSocketImpl.java	Fri Oct 18 17:08:59 2019 +0100
+++ b/src/java.base/share/classes/sun/net/PlatformDatagramSocketImpl.java	Fri Oct 18 21:25:01 2019 +0100
@@ -25,8 +25,8 @@
 
 package sun.net;
 
-import java.net.DatagramSocketImpl;
+public interface PlatformDatagramSocketImpl {
 
-public abstract class  PlatformDatagramSocketImpl extends DatagramSocketImpl {
-    public abstract boolean nativeConnectDisabled();
+    /** Tells whether, or not, the native connect should be used. */
+    boolean nativeConnectDisabled();
 }

--- a/src/java.base/share/classes/sun/nio/ch/NioDatagramSocketImpl.java	Fri Oct 18 17:08:59 2019 +0100
+++ b/src/java.base/share/classes/sun/nio/ch/NioDatagramSocketImpl.java	Fri Oct 18 21:25:01 2019 +0100
@@ -31,6 +31,7 @@
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.VarHandle;
 import java.net.DatagramPacket;
+import java.net.DatagramSocketImpl;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.NetworkInterface;
@@ -63,7 +64,10 @@
 /**
  * A DatagramSocketImpl based on low-level NIO primitives.
  */
-public class NioDatagramSocketImpl extends PlatformDatagramSocketImpl {
+public class NioDatagramSocketImpl
+    extends DatagramSocketImpl
+    implements PlatformDatagramSocketImpl
+{
 
     private static final NativeDispatcher nd = new SocketDispatcher();