如何在Groovy中用逗号分隔List元素?

jas*_*son 7 groovy list

def names = ["myname", "yourname", "theirname", "allnames"]

String n = ""
names.each{
    n += it + ","
}

println n
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输出:

myname,yourname,theirname,allnames,
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如何摆脱尾随的逗号?