21、map putAll

class GroovyTest {

    static void main(args) {
        def defaults = [1: 'a', 2: 'b', 3: 'c', 4: 'd']
        def overrides = [1: 'z', 5: 'x', 13: 'x']

        defaults.putAll(overrides)
        print defaults
    }

输出：

[1:z, 2:b, 3:c, 4:d, 5:x, 13:x]