Groovy(读做:gu : ru : wei)
Groovy是一种运行在jvm上的动态语言,它吸取了Python、Ruby和SmallTalk等语言的优点;在Java的基础之上增加了许多特色功能,相比Java语法更易懂,易上手调试;无缝集成了Java的类库,编译后的.groovy也是以class形式出现。
下载安装
下载地址:http://groovy-lang.org/download.html
解压zip文件 unzip apache-groovy-sdk-2.5.4.zip
配置环境变量 export GROOVY_PATH=/Users/emmet/apache/groovy-2.5.4
export PATH=$PATH:$GROOVY_PATH/bin
测试groovy安装是否成功 groovy -v
Groovy脚本
变量定义def name = "gegeza" 或者 int age = 13
定义集合
def ageRange = 0..5
def col = ['bitwalk', 'emmet', 'gegeza']
集合加减元素
assert ageRange - [2,4] == [0,1,3,5]
col.add('shawanyi')
col << 'haha'
col[6] = 'jiuzheme'
col += 'bugan'
定义map
def dada = [name:'dada', age:16, addr:'hangzhou']
print(dada.getClass())
循环
//循环方式1
for (i in 1..<10) {
println(i)
}
//循环方式2 it为默认关键字
col.each {
println(it)
}
//循环方式3
ageRange.each { value ->
println(value)
}
//map循环方式
dada.each {key, value ->
println("${key}-${value}")
}
'bitwalk'.each {
println(it.toUpperCase())
}
定义闭包
def excite = {
word -> return "this is ${word}"
}
println(excite('what'))
Grovvy类
import org.junit.Test
class Song {
def name
def artist
def genre
//加?可避免空指针异常
String getArtist() {
return artist?.toUpperCase()
}
String toString() {
return "${name}, ${artist}, ${genre}"
}
static void main(args) {
def song = new Song(name: "Hope", artist: "dd", genre: "F");
println(song.toString())
}
@Test //加Test注解即可启用Junit测试
void test() {
def song = new Song(name: "Hope", genre: "F");
println(song.getArtist())
}
}