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Comment by _old_dude_ | Hacker News Reader

There are interoperable since Java 8, using the operator ::

  com.google.common.base.Predicate<String> guavaPredicate = ...
  java.util.function.Predicate<String> predicate = guavaPredicate::apply;

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The :: syntax minimizes the pain, but the fact you have to do it at all is still irritating, and IIUC it incurs a small runtime cost due to the intermediate object that's generated to convert between the two interfaces. I recently cleared out some of these intermediaries in a hot area of code and got a small but significant performance boost.

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