New candidate JEP: 427: Pattern Matching for switch (Third Preview)

[mark.reinhold at oracle.com]

https://openjdk.java.net/jeps/427

  Summary: Enhance the Java programming language with pattern matching
  for switch expressions and statements. Extending pattern matching to
  switch allows an expression to be tested against a number of patterns,
  each with a specific action, so that complex data-oriented queries can
  be expressed concisely and safely. This is a preview language feature.

- Mark