Gradle系列知识（三）——Groovy的数据结构Map

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def students = ["001":"Tom","002":"Jack","003":"Rose","004":"Tim"]

println students['001']
println students."002"

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Tom
Jack

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def students = ["001":"Tom","002":"Jack","003":"Rose","004":"Tim"]
//添加元素
students."005" = "Lily"
println students

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[001:Tom, 002:Jack, 003:Rose, 004:Tim, 005:Lily]

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def students = ["001":"Tom","002":"Jack","003":"Rose","004":"Tim","005":"Lily"]

students.each {
    println "key ="+it.key+"   value ="+it.value
}

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key =001   value =Tom
key =002   value =Jack
key =003   value =Rose
key =004   value =Tim
key =005   value =Lily

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//用键值对的方式
students.each {def key,def value ->
    println "key=${key}"+"    value=${value}"
}
//用entry对象的方式
students.each {def student ->
    println "key=${student.key}"+"  value=${student.value}"
}
//带索引的方式
students.eachWithIndex{ def student,int index->
    println "index=${index}"+"  key=${student.key}"+"    value=${student.value}"
}
students.eachWithIndex{ def key,def value,int index->
    println "index=${index}"+"  key=${key}"+"    value=${value}"
}

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def students = ["001":"Tom","002":"Jack","003":"Rose","004":"Tim","005":"Lily","006":"Jack"]

//单个查询
def result = students.find {
    return  it.value == "Rose"//这里跟前面的list一样，闭包里面有默认参数it是遍历的Map中的元素Entry
}
println result

//嵌套查找
//我们现在需要查找名称是Jack的所有学号

def num = students.findAll {def student->
    return student.value == "Jack"
}.collect {
    return it.key
}

println num.toListString()

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003=Rose
[002, 006]

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def students = ["001":"Tom","002":"Jack","003":"Rose","004":"Tim","005":"Lily","006":"Jack"]


def result = students.groupBy {
    return it.value == "Jack"?"group_jack":"group_default"
}

println result

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[group_default:[001:Tom, 003:Rose, 004:Tim, 005:Lily], group_jack:[002:Jack, 006:Jack]]