1. [грýви]

2. Привет!
@antonarhipov
@jrebel
Java,
Groovy

3. Немного
истории
Rhino
1995
1997
2001
2003
2011
BeanShell

4. James
Strachan
29
Aug
2003
Groovy
–
the
birth
of
new
dynamic
language
for
Java
PlaOorm
h0p://radio-­‐weblogs.com/0112098/2003/08/29.html
July
2009
“I
can
honestly
say
if
someone
had
shown
me
the
Programming
in
Scala
book
back
in
2003
I’d
probably
never
created
Groovy”

5. Плюшки
• Скрипты!
• Коллекции
• GPath
• “Строители”
• Метапрограммирование
• Экосистема

6. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!

7. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!
Необязательны:
“;”,
System.out,
(),
метод
main(),
определение
класса

8. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!
def name = ‘Anton’!
println “Hello, $name!”!
Динамическая
типизация,
GString

9. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!
def name = ‘Anton’!
println “Hello, $name!”!
String longer = “””Hello, $name, !
Groovy is really cool!”””!
Статическая
типизация,
«многострочность»

10. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!
def name = ‘Anton’!
println “Hello, $name!”!
String longer = “””Hello, $name, !
Groovy is really cool!”””!
assert 1.5 == 3/2!
BigDecimal
equals()

11. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!
«утиная»
def name = ‘Anton’!
println “Hello, $name!”!
String longer = типизация
“””Hello, $name,!
Groovy is really cool!”””!
assert 1.5 == 1/2!
def printSize(obj){!
print obj?.size()!
безопасное
}!
разыменование
ссылок

12. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!
def name = ‘Anton’!
Специальный
println “Hello, $name!”!
String longerля
“””Hello, $name, !
синтаксис
д =
Groovy is really cool!”””!
коллекций
assert 1.5 == 1/2!
def printSize(obj){!
print obj?.size()!
}!
def pets = [‘dog’,’cat’]! замыкания
и
pets.each {pet ->! перегрузка
assert pet < ‘dog’! операторов
}!

13. System.out.println(“Hello, World!”);!
println ‘Hello, World!’!
def name = ‘Anton’!
println “Hello, $name!”!
String longer = “””Hello, $name, !
Groovy is really cool!”””!
assert 1.5 == 1/2!
def printSize(obj){!
print obj?.size()!
}!
def pets = [‘dog’,’cat’]!
pets.each {pet ->!
assert pet < ‘dog’!
}!

14. import java.util.List;!
import java.util.ArrayList;!
class Erase {!
private List removeLongerThan(List strings, int length) {!
List result = new ArrayList();!
Java
==
Groovy
for (String s: strings) {!
if (s.length() <= length) {!
result.add(s);!
}!
}!
return result;!
}!
!
public static void main(String[] args) {!
List names = new ArrayList();!
names.add("Вася"); names.add("Коля");!
names.add("Петя"); names.add("Фёдор");!
System.out.println(names);!
Erase e = new Erase();!
List shortNames = e.removeLongerThan(names, 4);!
System.out.println(shortNames.size());!
for (String s: shortNames) {!
System.out.println(s);!
}!
}!
}!

15. import java.util.List;!
import java.util.ArrayList;!
class Erase {!
private List removeLongerThan(List strings, int length) {!
List result = new ArrayList();!
for (String s: strings) {!
if (s.length() <= length) {!
result.add(s);!
}!
}! Импорты
по-­‐умолчанию
return result;!
}! ;
необязателен
!
public static void main(String[] args) {!
List names = new ArrayList();!
names.add("Вася"); names.add("Коля");!
names.add("Петя"); names.add("Фёдор"); !
System.out.println(names);!
Erase e = new Erase();!
List shortNames = e.removeLongerThan(names, 4); !
System.out.println(shortNames.size());!
for (String s: shortNames) {!
System.out.println(s);!
}!
}!
}!

16. class Erase {!
private List removeLongerThan(List strings, int length) {!
List result = new ArrayList()!
for (String s: strings) {!
if (s.length() <= length) {!
result.add(s)!
}!
}!
return result!
}!
!
public static void main(String[] args) {!
List names = new ArrayList()!
names.add("Вася") names.add("Коля") !
names.add("Петя") names.add("Фёдор") !
System.out.println(names)!
Erase e = new Erase()!
List shortNames = e.removeLongerThan(names, 4) !
System.out.println(shortNames.size())!
for (String s: shortNames) {!
System.out.println(s)!
}!
}!
}!

17. class Erase {!
private List removeLongerThan(List strings, int length) {!
List result = new ArrayList()!
for (String s: strings) {!
if (s.length() <= length) {!
result.add(s)!
}! Динамическая
типизация
}!
return result!
Не
надо
определять
класс
и
main()
!
}! length
и
size
public static void main(String[] args) {!
List names = new ArrayList()!
names.add("Вася") names.add("Коля") !
names.add("Петя") names.add("Фёдор") !
System.out.println(names)!
Erase e = new Erase()!
List shortNames = e.removeLongerThan(names, 4)!
System.out.println(shortNames.size())!
for (String s: shortNames) {!
System.out.println(s)!
}!
}!
}!

18. def removeLongerThan(strings, length) {!
def result = new ArrayList()!
for (s in strings) {!
if (s.size() <= length) {!
result.add(s)!
}!
}!
return result!
}!
!
names = new ArrayList()!
names.add("Вася") !
names.add("Коля") !
names.add("Петя") !
names.add("Фёдор") !
System.out.println(names)!
shortNames = e.removeLongerThan(names, 4)!
System.out.println(shortNames.size())!
for (s: shortNames) {!
System.out.println(s)!
}!

19. def removeLongerThan(strings, length) {!
def result = new ArrayList()!
for (s in strings) {!
if (s.size() <= length) {!
result.add(s)!
}!
}! Нотация
для
списков
return result!
}! Упрощённая
работа
со
списками
!
names = new ArrayList()! return
необязателен
names.add("Вася") !
names.add("Коля") !
names.add("Петя")!
names.add("Фёдор")!
System.out.println(names)!
shortNames = e.removeLongerThan(names, 4)!
System.out.println(shortNames.size())!
for (s: shortNames) {!
System.out.println(s)!
}!

20. def removeLongerThan(strings, length) {!
strings.findAll { it.size() <= length }!
}!
!
names = ["Вася", "Коля", "Петя", "Фёдор"]!
System.out.println(names)!
shortNames = e.removeLongerThan(names, 4)!
System.out.println(shortNames.size())!
shortNames.each { System.out.println(s) }!

21. def removeLongerThan(strings, length) {!
strings.findAll { it.size() <= length }!
}!
!
names = ["Вася", "Коля", "Петя", "Фёдор"]!
System.out.println(names)!
shortNames = e.removeLongerThan(names, 4)!
System.out.println(shortNames.size())!
shortNames.each { System.out.println(s) }!
Ненужный
метод!
Убрать
ненавистный
System.out
!
Скобки
в
сад!

22. names = ["Вася", "Коля", "Петя", "Фёдор"]!
println names!
shortNames = names.findAll { it.size() <= 4 }!
println shortNames.size()!
shortNames.each { println it }!
[Вася,
Коля,
Петя,
Федя]
3
Вася
Коля
Петя

23. Коллекции

24. def list = [1, 2, 3, 4, 5, 5]!
assert list.get(2) == 3!
assert list[2] == 3!
assert list instanceOf java.util.List!

25. def list = [1, 2, 3, 4, 5, 5]!
assert list.get(2) == 3!
assert list[2] == 3!
assert list instanceOf java.util.List!
def list = [1, 2, 3, 4, 5, 5] as Set!
assert list.size() == 5!
assert list instanceOf java.util.Set!
!

26. def range = 5..8!
assert range.size() == 4!
assert range[2] == 7!
assert range.contains(5)!
!
!
!

27. def range = 5..8!
assert range.size() == 4!
assert range[2] == 7!
assert range.contains(5)!
!
def range = 5..<8!
assert range.size() == 3!
assert ! range.contains(8)!
!
!
!

28. def range = 5..8!
assert range.size() == 4!
assert range[2] == 7!
assert range.contains(5)!
!
def range = 5..<8!
assert range.size() == 3!
assert ! range.contains(8)!
!
assert range.from == 5!
assert range.to == 7!
!
!

29. def range = ‘a’..’d’!
assert range.size() == 4!
assert range[2] == ‘c’!
assert range.contains(‘a’)!
assert ! range.contains(‘e’)!
!
!

30. for(i in 1..10) { !
println “${i}” !
}!
!
(1..10).each { !
println “$it” !
}!
!
switch(years){!
case 1..10: rate = 1.015; break; !
case 11..25: rate = 0.905; break;!
default: rate = 0.755; !
}!

31. def map = [name:’Anton’, age:28, id:2]!
assert map[’name’] == 'Anton’!
assert map.id == 2!
assert map instanceOf java.util.Map!
!
!
!

32. def map = [name:’Anton’, age:28, id:2]!
assert map[’name’] == 'Anton’!
assert map.id == 2!
assert map instanceOf java.util.Map!
!
def empty = [:]!
empty.foo = 25!
assert empty.foo == 25!
!
!

33. [1,2,3,4,5]*.plus(1)!
[2,
3,
4,
5,
6]

34. [1,2,3,4,5]*.plus(1)!
[2,
3,
4,
5,
6]
[1,2,3,4,5].findAll {it > 3}!
[4,
5,
6]

35. [5,2,1,3,4].sort()!
[1,
2,
3,
4,
5]

36. [5,2,1,3,4].sort()!
[1,
2,
3,
4,
5]
[‘ccc’,‘a’,‘bb’].sort {it.size()}!
[‘a’,
‘bb’,
‘ccc’]

37. ['test', 12, 20, true].grep(Boolean)!
!
['test', 'Groovy', 'Java'].grep(~/^G.*/)!
!
['a', 'b', 'c', 'd'].grep(['b', 'c'])!
!
[1, 15, 16, 30, 12].grep(12..18)!
!
[12.300, 109.20, 42.031].grep(42.031)!
!
[10, 20, 30, 50, 100].grep({ it > 50 })!

38. def
text
="""
<cars>
<car
name='HSV
Maloo'
year='2006'>
<country>Australia</country>
</car>
<car
name='P50'
year='1962'>
<country>Isle
of
Man</country>
</car>
<car
name='Royale'
year='1931'>
<country>France</country>
</car>
</cars>
[‘HSV
Maloo’,
‘P50’]
"""
def
records
=
new
XmlParser().parseText(text)
cars
=
records.car.grep
{
it.@year
>
'1960'
}
names
=
cars.collect
{it.@name}

39. import groovy.xml.MarkupBuilder!
!
def builder = new MarkupBuilder()!
!
builder.html {!
head {!
title ”Page Title”!
}!
<html>
body {!
<head>
p ”My text" !
<•tle>Page
Title</•tle>
}!
</head>
}!
<body>
<p>My
text</p>
</body>
</html>

40. import groovy.json.JsonBuilder!
!
def builder = new JsonBuilder()!
def root = builder.me {!
name ”Anton”!
lastName ”Arhipov”!
age 13!
}!
println builder!
{"me":{"name":"Anton","lastName":"Arhipov","age":13}}
println root!
[me:[name:Anton,
lastName:Arhipov,
age:13]]

41. import groovy.util.AntBuilder!
def ant = new AntBuilder()!
ant.sequential {!
echo("inside sequential")!
myDir = "target/AntTest/"!
mkdir(dir:myDir)!
copy(todir:myDir) {!
fileset(dir:"src/test") {!
include(name:"**/*.groovy")!
}!
}!
echo("done")!
}!

42. html {!
head {!
title "Hello"!
}!
body {!
p "Hello"!
}!
}!

43. html({!
head({!
title("Hello")!
}),!
body({!
p("Hello")!
})!
})!

44. html { }!

45. Название
метода
html { }!
Параметр
instanceof
Closure

46. html { }!

47. html { title {} }!

48. html { title { итд } }!

49. invokeMethod!
!
methodMissing!

50. class Foo {!
!
}!
!
foo = new Foo()!
!
foo.hello()!
groovy.lang.MissingMethodExcep^on:
No
signature
of
method:
Foo.hello()
is
applicable
for
argument
types:
()
values:
[]
Possible
solu•ons:
sleep(long),
sleep(long,
groovy.lang.Closure),
each(groovy.lang.Closure),
split(groovy.lang.Closure),
getAt(java.lang.String),
wait()

51. class Foo {!
def methodMissing(String name, args) {…}!
}!
!
foo = new Foo()!
!
foo.hello()!

52. def invokeMethod(String name, args){!
def call = args[0]!
println "<$name>"!
if(call instanceof Closure){!
call.delegate = this!
call.call()!
} else {!
println call.toString()!
}!
println "</$name>" !
}!

53. Integer.metaClass {!
getEur = { -> delegate + "EUR" }!
}!
!
10.eur!
price:
10EUR

54. import groovy.time.TimeCategory!
!
use(TimeCategory){!
1.day.from.now!
}!

55. groovy.codehaus.org