Guava is Google's core Java library that provides common utilities and extensions to the Java collections framework. It targets Java 5+ and benefits from generics. Some key features include validation checks, joining/splitting strings, hashcode/equals implementation assistance, file I/O utilities, and collection types like BiMap and Multimap that allow multiple values per key. Guava is well designed but not a complete replacement for Apache Commons and requires Java 5 or higher.

1. Guava
Google’s Core Libraries for java
작성일 2011-09-25
작성자 커뮤니티개발1팀 정희경

2. Contents
 Guava Overview
 Guava vs Apache Commons
 Guava Library & Examples
 Guava Pros & Cons

3. Guava Overview
 Google’s core Java libraries for Java 5+
 The Apache Software License, Version 2.0
 Similar to Apache Commons
 Extension of the Java Collections Framework
 Google Collection

4. Guava vs Apache Commons
 Generics
 Guava targets Java 5 - Greatly benefits from the
Java 5 features: generics, enums, autoboxing ..

5. Guava vs Apache Commons
 Consistency with Collections framework
 Correctness – don’t need to test
 Guava has only one code dependency -
javax.annotation

6. Guava Library & Examples
 The Guava Packages

7. Guava Library & Examples
 com.google.common.base
 common code used by other package

8. Guava Library & Examples
 com.google.common.base.Preconditions
 Validation checks before execution

9. Guava Library & Examples
 com.google.common.base.Preconditions
 Validation checks before execution
 Additional exception types
 Better handling of message arguments
 In Apache Commons
 In Guava
 Easy assignment after not null check
 In Apache Commons
 In Guava

10. Guava Library & Examples
 com.google.common.base.Joiner

11. Guava Library & Examples
 com.google.common.base.Splitter

12. Guava Library & Examples
 com.google.common.base.Objects
 Makes it easy to implement hashcode/ equals

13. Guava Library & Examples
 com.google.common.io.Files
 for working with Java I/O Collection.
java.io.File
org.apache.commons.io.FileUtils

14. Guava Library & Examples
 com.google.common.io.Files
 for working with Java I/O Collection.
com.google.common.io.Files
Result

15. Guava Library & Examples
 com.google.common.io.Files

16. Guava Library & Examples
 com.google.common.collect
 Contains generic collection interfaces and impleme
ntations, other utilities for working with collections
 Collection Types
 BiMap
 Multiset
 Mutimap
 ListMultimap
 SetMultimap
 SortedSetMultimap
 Table
 ClassToInstanceMap

17. Guava Library & Examples
 com.google.common.collect

18. Guava Library & Examples
 com.google.common.collect.Multimaps
 allow multiple values to be stored for every key

19. Guava Library & Examples
 com.google.common.collect.BiMap
 one-to-one bidirectional relationship between key
and value of the Map

20. Guava Library & Examples
 com.google.common.collect.Constraints
 Similar to preconditions in a way that they can restri
ct what values are added to a collection

21. Guava Pros & Cons
 Guava targets Java 5 - Greatly benefits from the
Java 5 features: generics
 Guava is very well designed / documented
 The code is useful patterns to make the API more
readable, secure, thread-safe..
 Functional programming support

22. Guava Pros & Cons
 It's not a sufficient replacement for Apache
Commons, in particular commons-codec
 If you're in an environment requiring Java 1.3 or
1.4, you're out of luck.

23. Q&A

24. 감사합니다 