文章來自：http://www.ciandcd.com 文中的代碼來自可以從github下載：?https://github.com/ciandcd 安裝：

wget https://dl.bintray.com/groovy/maven/apache-groovy-binary-2.4.7.zip
unzip apache-groovy-binary-2.4.7.zip
sudo ln -s /home/osboxes/Downloads/groovy-2.4.7/bin/groovy /usr/bin/groovy
groovy -v
Groovy Version: 2.4.7 JVM: 1.8.0_91 Vendor: Oracle Corporation OS: Linux

?

參考：

https://learnxinyminutes.com/docs/groovy/
http://www.groovy-lang.org/index.html
https://github.com/ciandcd/jenkins-awesome/blob/master/utils/groovy_basic.gy

groovy基本語法，方便大家查閱。

#!/usr/bin/env groovy// Hello World println "Hello world!"// Variables: You can assign values to variables for later use def x = 1 println xx = new java.util.Date() println xx = -3.1499392 println xx = false println xx = "Groovy!" println x//Creating an empty list def technologies = []/*** Adding a elements to the list ***/ // As with Java technologies.add("Grails")// Left shift adds, and returns the list technologies << "Groovy"// Add multiple elements technologies.addAll(["Gradle","Griffon"])/*** Removing elements from the list ***/ // As with Java technologies.remove("Griffon")// Subtraction works also technologies = technologies - 'Grails'/*** Iterating Lists ***/ // Iterate over elements of a list technologies.each { println "Technology: $it"} technologies.eachWithIndex { it, i -> println "$i: $it"}/*** Checking List contents ***/ //Evaluate if a list contains element(s) (boolean) contained = technologies.contains( 'Groovy' )// Or contained = 'Groovy' in technologies// Check for multiple contents technologies.containsAll(['Groovy','Grails'])/*** Sorting Lists ***/// Sort a list (mutates original list) technologies.sort()// To sort without mutating original, you can do: sortedTechnologies = technologies.sort( false )/*** Manipulating Lists ***///Replace all elements in the list Collections.replaceAll(technologies, 'Gradle', 'gradle')//Shuffle a list Collections.shuffle(technologies, new Random())//Clear a list technologies.clear()//Creating an empty map def devMap = [:]//Add values devMap = ['name':'Roberto', 'framework':'Grails', 'language':'Groovy'] devMap.put('lastName','Perez')//Iterate over elements of a map devMap.each { println "$it.key: $it.value" } devMap.eachWithIndex { it, i -> println "$i: $it"}//Evaluate if a map contains a key assert devMap.containsKey('name')//Evaluate if a map contains a value assert devMap.containsValue('Roberto')//Get the keys of a map println devMap.keySet()//Get the values of a map println devMap.values()//Groovy supports the usual if - else syntax def x1 = 3if(x1==1) {println "One" } else if(x1==2) {println "Two" } else {println "X greater than Two" }//Groovy also supports the ternary operator: def y = 10 def x2 = (y > 1) ? "worked" : "failed" assert x2 == "worked"//Instead of using the ternary operator: //displayName = user.name ? user.name : 'Anonymous' //We can write it: //displayName = user.name ?: 'Anonymous'//For loop //Iterate over a range def x3 = 0 for (i in 0 .. 30) {x3 += i }//Iterate over a list x4 = 0 for( i in [5,3,2,1] ) {x4 += i }//Iterate over an array array = (0..20).toArray() x5 = 0 for (i in array) {x5 += i }//Iterate over a map def map = ['name':'Roberto', 'framework':'Grails', 'language':'Groovy'] x6 = 0 for ( e in map ) {x6 += e.value }/*ClosuresA Groovy Closure is like a "code block" or a method pointer. It is a piece ofcode that is defined and then executed at a later point.More info at: http://www.groovy-lang.org/closures.html *///Example: def clos = { println "Hello World!" }println "Executing the Closure:" clos()//Passing parameters to a closure def sum = { a, b -> println a+b } sum(2,4)//Closures may refer to variables not listed in their parameter list. def x7 = 5 def multiplyBy = { num -> num * x7 } println multiplyBy(10)// If you have a Closure that takes a single argument, you may omit the // parameter definition of the Closure def clos2 = { println it } clos2( "hi" )/*Groovy can memoize closure results [1][2][3] */ def cl = {a, b ->sleep(3000) // simulate some time consuming processinga + b }mem = cl.memoize()def callClosure(a, b) {def start = System.currentTimeMillis()println mem(a, b)println "Inputs(a = $a, b = $b) - took ${System.currentTimeMillis() - start} msecs." }callClosure(1, 2) callClosure(1, 2) callClosure(2, 3) callClosure(2, 3) callClosure(3, 4) callClosure(3, 4) callClosure(1, 2) callClosure(2, 3) callClosure(3, 4)

　完

轉載于:https://www.cnblogs.com/itech/p/5627968.html

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