Download to read offline
![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](https://image.slidesharecdn.com/dkrssxpnr5qq5khmlrtv-signature-ac94c972292c7b2947c02d4599df78995be1f93559ff2b779ccbc3e1a42b21c2-poli-151111040602-lva1-app6891/85/Guava-collection-zero-to-hero-23-320.jpg)
![MultiMap
key Value
k1->v1; k1->v2; k2->v3
Map k1->[v1, v2], k2->[v3]](https://image.slidesharecdn.com/dkrssxpnr5qq5khmlrtv-signature-ac94c972292c7b2947c02d4599df78995be1f93559ff2b779ccbc3e1a42b21c2-poli-151111040602-lva1-app6891/85/Guava-collection-zero-to-hero-33-320.jpg)
Uploaded by逸帆 楊
Guava collection-zero-to-hero
This document provides an overview of the Guava library, including its history and key features. It started as Google's common Java libraries in 2002 and was open sourced in 2009. Some of the main components covered include collections, immutable collections, Optional, Preconditions, Iterables/FluentIterable, and time/hashing utilities. The document emphasizes that Guava aims to make Java development easier, more efficient, and more pleasant to work with.
More Related Content
Similar to Guava collection-zero-to-hero
Guava collection-zero-to-hero
- 1. Guava Collection Zero toHero @
- 2. I have adream today!
- 4. Guava Google Java • • JCFJava Collection Framework Google Collections Library • JDK Functional/caching/ range/hashing
- 5. Guava Google Collections Library ApacheCommon 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 CollectionJDK 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 areour Life Blood.
- 8. Bug Reports & Feature Requests areour Life Blood.
- 9.
- 10.
- 12.
- 13.
- 14.
- 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 itmy billion-dollar mistake." - Sir C. A. R. Hoare Optional API API JVM
- 18. It should beconsidered 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
- 19.
- 20.
- 21.
- 22. : Immutable 1/ defensiveprogramming 2/ thread-safe 3/
- 23. sorted copy, Google Performancenote [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.
- 25.
- 26. ImmutableMap Key: Integer Key:String HashMap HashMap ImmutableMap equals hashCode
- 27. ImmutableMap ImmutableMap entry hash equalsImmutbleMap equals Integer String Integer equals String hashCode equals
- 28.
- 29.
- 30.
- 31. MultiSet Set List add size MultiSetMap<E, Integer> Integer Apache Common Library Bag MultiSet Map
- 32.
- 33. MultiMap key Value k1->v1; k1->v2;k2->v3 Map k1->[v1, v2], k2->[v3]
- 34. MultiMaps MultiMap tip#1 ImmutableListMultiMap Immutable ListMultiMap UnSupportedOperationremove, clear, put, putAll, replaceValues. element
- 35. MultiMaps tip#2 index entry multiMapFunction Key id multiMap tip#3 Predicate view thread-safe serializable
- 36.
- 37.
- 38. transform transform view 1. view 2. transformadd addAll, set 3. Lazy filter size(), contains() trap: new ArrayList(Collection) toArray size()
- 39.
- 40. Iterables & FluentIterable AtGoogle 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 notthread-safe non-blocking Wrapper
- 43. Happy Hashing seed HashFunctionRPC Function Stuff Enum&String
- 44.
- 45. JodaTime Java Date 90s Formatter( + Runtime ) It’s mine.
- 46. JodaTime Say ByeBye toDate Mybatis
- 47.
- 48.
- 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)
- 50.
- 51.
- 54. Reference • Guava • Stackoverflow •Wikipedia • Oracle • http://goo.gl/bSVZ1S • http://goo.gl/YsbSt8 • https://goo.gl/iCL6u8 • http://goo.gl/wNW5Yv •