Making Java Groovy (JavaOne 2013)
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- Groovy is a JVM language that compiles to Java bytecodes and interoperates seamlessly with Java. - It simplifies Java development with features like optional semicolons, optional parentheses, and native collections. - Groovy also includes closures, builders, metaprogramming capabilities, and tools like Spock for testing and Gradle for building.
![Operator Overloading
All operators in Groovy invoke methods
a + b a.plus(b)
a – b a.minus(b)
a * b a.multiply(b)
a[b] a.getAt(b)
a[b] = c a.putAt(b,c)
a == b a.equals(b) or
a.compareTo(b)](https://image.slidesharecdn.com/con1976kousen-130924012931-phpapp02/85/Making-Java-Groovy-JavaOne-2013-14-320.jpg)
![Operator Overloading
All operators in Groovy invoke methods
http://groovy.codehaus.org/Operator+Overloading
a + b a.plus(b)
a – b a.minus(b)
a * b a.multiply(b)
a[b] a.getAt(b)
a[b] = c a.putAt(b,c)
a == b a.equals(b) or
a.compareTo(b)](https://image.slidesharecdn.com/con1976kousen-130924012931-phpapp02/85/Making-Java-Groovy-JavaOne-2013-15-320.jpg)
![Lists
[3, 1, 4, 1, 5, 9, …]
['this', 'is', 'a', 'list’]](https://image.slidesharecdn.com/con1976kousen-130924012931-phpapp02/85/Making-Java-Groovy-JavaOne-2013-30-320.jpg)
![Sets
[3, 1, 4, 1, 5, 9, …] as Set
Set strings](https://image.slidesharecdn.com/con1976kousen-130924012931-phpapp02/85/Making-Java-Groovy-JavaOne-2013-31-320.jpg)
![Maps
def map = [a:1, b:2, c:3]
map.d = 4
map['e'] = 5
map.put('f', 6)](https://image.slidesharecdn.com/con1976kousen-130924012931-phpapp02/85/Making-Java-Groovy-JavaOne-2013-32-320.jpg)
![JSON
ICNDB the Internet Chuck Norris Database
http://api.icndb.com/jokes/random?
limitTo=[nerdy]&
firstName=…&
lastName=…](https://image.slidesharecdn.com/con1976kousen-130924012931-phpapp02/85/Making-Java-Groovy-JavaOne-2013-45-320.jpg)
Making Java Groovy (JavaOne 2013)
- 1. Making Java Groovy Simplify Your Java Development With Groovy JavaOne 2013
- 2. Contact Info Ken Kousen President, Kousen IT, Inc. www.kousenit.com ken.kousen@kousenit.com @kenkousen Making Java Groovy http://manning.com/kousen
- 4. Groovy JVM language compiles to bytecodes
- 5. Groovy JVM language compiles to bytecodes optional semicolons
- 6. Groovy JVM language compiles to bytecodes optional semicolons optional parentheses
- 7. Groovy JVM language compiles to bytecodes optional semicolons optional parentheses everything is an object
- 8. Adding Groovy to Java
- 9. Adding Groovy to Java Actually, Boromir, One Does
- 10. Adding Groovy to Java Actually, Boromir, One Does (and simply)
- 11. Adding Groovy to Java Actually, Boromir, One Does (and simply) (and btw, Lord Stark, you might want to stay out of King’s Landing…)
- 12. Adding Groovy to Java Demo: Execute compiled Groovy with java command
- 13. Operator Overloading All operators in Groovy invoke methods
- 14. Operator Overloading All operators in Groovy invoke methods a + b a.plus(b) a – b a.minus(b) a * b a.multiply(b) a[b] a.getAt(b) a[b] = c a.putAt(b,c) a == b a.equals(b) or a.compareTo(b)
- 15. Operator Overloading All operators in Groovy invoke methods http://groovy.codehaus.org/Operator+Overloading a + b a.plus(b) a – b a.minus(b) a * b a.multiply(b) a[b] a.getAt(b) a[b] = c a.putAt(b,c) a == b a.equals(b) or a.compareTo(b)
- 18. POGOs Actually, YES Plain Old Groovy Objects
- 19. POGOs Generated getters / setters
- 20. POGOs Generated getters / setters Map-based constructor
- 21. POGOs Generated getters / setters Map-based constructor AST transformations @ToString @EqualsAndHashCode @TupleConstructor @Canonical
- 22. Adding Groovy to Java Demo: Account class in Groovy NumberFormat from Java Test in Java
- 24. Collections Okay, make it so…
- 25. Collections Okay, make it so… Native collections
- 26. Collections Okay, make it so… Native collections Ranges
- 27. Collections Okay, make it so… Native collections Ranges Lists and Sets
- 28. Collections Okay, make it so… Native collections Ranges Lists and Sets Maps
- 30. Lists [3, 1, 4, 1, 5, 9, …] ['this', 'is', 'a', 'list’]
- 31. Sets [3, 1, 4, 1, 5, 9, …] as Set Set strings
- 32. Maps def map = [a:1, b:2, c:3] map.d = 4 map['e'] = 5 map.put('f', 6)
- 33. Closures { … it … } { x, y -> x + y }
- 34. Closures { … it … } { x, y -> x + y } anonymous functions as first-class objects
- 35. Closures { … it … } { x, y -> x + y } anonymous functions as first-class objects (oversimplified, but it’s a start…)
- 37. Functional Groovy Closures lambdas (if pure) collect map findAll filter inject reduce
- 39. Groovy JDK Java classes enhanced by Groovy through metaprogramming Number String Date Collection URL …
- 40. RESTful Web Service Google v3 Geocoder Convert addresses to latitude / longitude
- 42. Geocoder Base URL URLEncoder.encode(it, 'UTF-8').join(',’) params.collect { k,v -> "$k=$v" }.join('&')
- 43. Geocoder Base URL URLEncoder.encode(it, 'UTF-8').join(',’) params.collect { k,v -> "$k=$v" }.join('&') XmlSlurper.parse("$base$qs")
- 45. JSON ICNDB the Internet Chuck Norris Database http://api.icndb.com/jokes/random? limitTo=[nerdy]& firstName=…& lastName=…
- 47. Spock Testing
- 49. Spock Specification + Mock Includes JUnit runner
- 50. Spock Specification + Mock Includes JUnit runner Data-driven tests
- 51. Spock Specification + Mock Includes JUnit runner Data-driven tests Database-driven tests
- 53. Gradle Build tool DSL for builds
- 54. Gradle Build tool DSL for builds Build script in Groovy rather than XML
- 55. Gradle Build tool DSL for builds Build script in Groovy rather than XML Used by: Hibernate, Spring, Android, …
- 57. Summary Groovy compiles to bytecodes Groovy JDK Native collections Closures Builders Metaprogramming