tweak material on Java 8 interfaces

Author: SethTisue

_overviews/tutorials/scala-for-java-programmers.md

@@ -554,13 +554,13 @@ Apart from inheriting code from a super-class, a Scala class can also
 import code from one or several *traits*.
 
 Maybe the easiest way for a Java programmer to understand what traits
-are is to view them as interfaces which can also contain code (This 
-feature is available in Java since version 8 using the `default` keyword
-as well as static methods. Default methods can be overriden in implementing
-classes. Since Java 9 private methods can also be used in interfaces.). In
+are is to view them as interfaces which can also contain code.  In
 Scala, when a class inherits from a trait, it implements that trait's
 interface, and inherits all the code contained in the trait.
 
+(Note that since Java 8, Java interfaces can also contain code, either
+using the `default` keyword, or as static methods.)
+
 To see the usefulness of traits, let's look at a classical example:
 ordered objects. It is often useful to be able to compare objects of a
 given class among themselves, for example to sort them. In Java,