GROOVY简单语法实习

慢慢的看《GROOVY IN ACTION》的一个中文节译本，根据上面的东东慢慢练习。

中文看起来确实比英文快好多。。。：）

Book gina = new Book('Groovy in Action')
assert gina.getTitle() == 'Groovy in Action'
assert getTitleBackwards(gina) == 'noitcA ni yvoorG'

String getTitleBackwards(book) {
    title = book.getTitle()
    return title.reverse()
}

def groovyBook = new Book()
groovyBook.setTitle('Groovy conquers the world')
assert groovyBook.getTitle() == 'Groovy conquers the world'

groovyBook.title = 'Groovy conquers the world'
assert groovyBook.title == 'Groovy conquers the world'

def nick = 'Gina'
def book = 'Groovy in Action'
assert "$nick is $book" == 'Gina is Groovy in Action'

assert '12345' =~ /\d+/
assert 'xxxxx' == '12345'.replaceAll(/\d/, 'x')

def x = 1
def y = 2
assert x + y == 3
assert x.plus(y) == 3
assert x instanceof Integer

def roman = ['', 'I', 'II', 'III', 'IV', 'V', 'VI', 'VII']
assert roman[4] == 'IV'
roman[8] = 'VIII'
assert roman.size() == 9

def http = [
    100 : 'CONTINUE',
    200 : 'OK',
    400 : 'BAD REQUEST' ]
    
assert http[200] == 'OK'
http[500] = 'INTERNAL SERVER ERROR'
assert http.size() == 4

x = 1..10
assert x.contains(5)
assert x.contains(15) == false
assert x.size() == 10
assert x.from == 1
assert x.to == 10
assert x.reverse() == 10..1

[1, 2, 3].each { entry -> println entry }

def totalClinks = 0
def partyPeople = 100
1.upto(partyPeople) { guestNumber ->
    clinksWithGuest = guestNumber - 1
    totalClinks += clinksWithGuest
}
assert totalClinks == (partyPeople * (partyPeople - 1)) / 2

if (false) assert false
if (null) {
    assert false
} else {
    assert true
}

def i = 0
while (i < 10) {
    i++
}

assert i == 10

def clinks = 0
for (remainingGuests in 0..9) {
    clinks += remainingGuests
}

assert clinks == (10*9)/2

def list = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
for (j in list) {
    assert j == list[j]
}

list.each() { item ->
    assert item == list[item]
}

switch(3) {
    case 1 : assert false; break
    case 3 : assert true; break
    default : assert false
}