Question: When I open "Type Hierarchy" in Eclipse (either `F4` or `Ctrl+T`), is there any way to copy the result tree as text into the clipboard?

P.S. Print Screen is not a solution.

Answer: 
I don't think this is available, either now or in the near future: 

The [bug 108320](https://bugs.eclipse.org/bugs/show_bug.cgi?id=108320) back in 2005 already mentioned that lack of feature and was asking for the ability to at least print the Type hierarchy... 
It has been closed as " RESOLVED WONTFIX".
Copying the hierarchy still doesn't seem to be possible in Eclipse Neon.3, but you can use "Java Search" to work around this: enter the top-level type as the "Search string" and limit the search to "Implementors". You can then copy the search results.