Investigate refactorings for Java 1.8

[JnRouvignac]

#See http://www.techempower.com/blog/2013/03/26/everything-about-java-8/ :

• interfaces with static methods and default method implementations.
• instantiate @FunctionalInterface with lambdas, - automatically convert code to do it
  • use of methods references to do this
• Add @FunctionalInterface to single method interfaces
• Generic type inference improvements - remove more types
• Collections API additions - big opportunity here!!
  • Ex: Collection.removeIf() is O(n) for ArrayList rather than O(n2)
  • Ex: static Collections.sort(list, comparator) => List.sort(Comparator)
  • Ex: Map.computeIfAbsent() to simplify MultiMap usage
  • See Collections Refueled talk at JavaOne 2016
• java.util.function - can anything be done automatically here?
• java.util.stream - can anything be done automatically here?
• java.time - can anything be done automatically here?
  • See http://stackoverflow.com/questions/19431234/converting-between-java-time-localdatetime-and-java-util-date
  • and http://blog.progs.be/542/date-to-java-time
• Reflection and annotation changes - can anything be done automatically here?
• doclint - fix javadocs automatically
• java.util.Optional - can anything be done automatically here?
• newer helper methods: static methods on Comparator (ex: comparingInt()), Objects::nonNull(), etc.
• Other miscellaneous additions to java.lang, java.util, and elsewhere - can anything be done automatically here?
• From SonarQube:
  • Java 8's "Files.exists" should not be used - squid:S3725
  • Standard functional interfaces should not be redefined - squid:S1711

Also see https://blog.jetbrains.com/upsource/2016/08/03/what-to-look-for-in-java-8-code/

[JnRouvignac]

Functions allow to easily build Comparators with https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html#comparing-java.util.function.Function-

[JnRouvignac]

• String.chars()
• StringJoiner and String.join()
• Path.lines()
• Path.walk()
• Collection.removeIf()
• Comparators. comparing().thenComparing()
• New methods on List, Map, ConcurrentMap, etc.
• AtomicLong.updateAndGet()
• AtomicLong.accumulateAndGet()

[JnRouvignac]

Refactoring loops into collection pipelines: http://martinfowler.com/articles/refactoring-pipelines.html