title: Java 8 add extension/default method to class
body: <p>I am looking for a java equivalent to the C# extension methods feature. Now I have been reading about Java 8's default methods, but as far as I can see, I can only add these to interfaces...</p>
  
  <p>...is there any language feature that will allow me to write an extension method for a final class that doesn't implement an interface? (I'd rather not have to wrap it...)</p>