Get key in groovy maps

问题

def map = [name:"Gromit", likes:"cheese", id:1234]

I would like to access map in such a way that I can get the key

something like the output should be

map.keys returns array of string. basically i just want to get the keys

output:

name
likes
id

回答1:

try map.keySet()

and if you want an array:

map.keySet() as String[]; // thx @tim_yates

Or, more groovy-ish:

map.each{
    key, value -> print key;
}

来源：https://stackoverflow.com/questions/4898062/get-key-in-groovy-maps