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Guava collection-zero-to-hero
- 1. Guava Collection Zero to Hero @
- 2. I have a dream today!
- 4. Guava Google Java • • JCF Java Collection Framework Google Collections Library • JDK Functional/caching/ range/hashing
- 5. Guava Google Collections Library Apache Common Collections Guava 2002 2.0 2002 1.0 2003 3.0 2004 3.1 2006 3.2 2008 3.2.1 2007.10.22 2008.8 2009.6 2010.4 RC 2011.9 10.0 2011.12 11.0 2012 12&13&14 2013 15.0 2014 16&17&18 2015 19.0 2013.12 4.0 Java5 Java6
- 6. Guava 3/ Apache Collection JDK 4/ Java5 2/ Apache Collection Library warning 1/ It does not use generics, which is a problem for us as we hate to get compilation warnings from our code.
- 7. Guava Bug Reports & Feature Requests are our Life Blood.
- 8. Bug Reports & Feature Requests are our Life Blood.
- 10. Guava Some
- 12. Guava 1/ 2/
- 13. Guava
- 14. Collection
- 15. Vistor fields 1/ null reference 2/ static fields 3/ array array java.lang.instrument.getObjectSize The result may include some or all of the object's overhead Vistor call DFS
- 17. Optional "I call it my billion-dollar mistake." - Sir C. A. R. Hoare Optional API API JVM
- 18. It should be considered that the approach has been developed in terms of writing a new application, rather than maintaining an existing one. —Stephen Colebourne Optional • Optional Field • Optional API • Optional getter • setter Optional Domain null null Maybe
- 21. Immutable
- 22. : Immutable 1/ defensive programming 2/ thread-safe 3/
- 23. sorted copy, Google Performance note [immutableSortedCopy]: According to our benchmarking on Open JDK 7, this method is the most efficient way to make a sorted copy of a collection. no
- 24. Immutable
- 25. ImmutableMap Google ImmutableMap HashMap 1/ 2/ resize
- 26. ImmutableMap Key: Integer Key: String HashMap HashMap ImmutableMap equals hashCode
- 27. ImmutableMap ImmutableMap entry hash equals ImmutbleMap equals Integer String Integer equals String hashCode equals
- 30. Multi
- 31. MultiSet Set List add size MultiSet Map<E, Integer> Integer Apache Common Library Bag MultiSet Map
- 33. MultiMap key Value k1->v1; k1->v2; k2->v3 Map k1->[v1, v2], k2->[v3]
- 34. MultiMaps MultiMap tip#1 ImmutableListMultiMap Immutable ListMultiMap UnSupportedOperation remove, clear, put, putAll, replaceValues. element
- 35. MultiMaps tip#2 index entry multiMap Function Key id multiMap tip#3 Predicate view thread-safe serializable
- 36. Lists Iterable
- 38. transform transform view 1. view 2. transform add addAll, set 3. Lazy filter size(), contains() trap: new ArrayList(Collection) toArray size()
- 40. Iterables & FluentIterable At Google we work with very large quantities of data, which may be too large to fit in memory, but which can be traversed from beginning to end in the course of some computation. remove concat cycle Iterables lazy java8 Stream
- 42. Other Collections EvictingQueue not thread-safe non-blocking Wrapper
- 43. Happy Hashing seed HashFunction RPC Function Stuff Enum&String
- 45. JodaTime Java Date 90s Formatter ( + Runtime ) It’s mine.
- 46. JodaTime Say ByeBye to Date Mybatis
- 47. RangeSet 10:30 11:3011:00 11:45 1 2 3 4
- 48. BloomFilter By Burton Howard Bloom
- 49. m:slot n: k: hash BloomFilter (1%) 40000000/8/1024/1024=4.7MB #Murmur(92 ns) #FNV-1a(86 ns) #FNV-1 (92 ns) #DBJ2a (91 ns) #DJB2 (93ns) = 450ns O(1) 305MB for HashSet(without resize)
- 54. Reference • Guava • Stackoverflow • Wikipedia • Oracle • http://goo.gl/bSVZ1S • http://goo.gl/YsbSt8 • https://goo.gl/iCL6u8 • http://goo.gl/wNW5Yv •