18、map keyset entryset values

class GroovyTest {

    static void main(args) {

        def map = [1: 'a', 2: 'b', 3: 'c']

        def entries = map.entrySet()
        entries.each{ entry ->
            println entry.key+"-"+entry.value
        }

        def keys = map.keySet()
        println keys

        def values = map.values()
        println values


    }
}

输出：

1-a
2-b
3-c
[1, 2, 3]
[a, b, c]