["x" : 1, "y" : 2]

List list = new ArrayList();
list.add(["x" : 1, "y" : 2]);
list.add(["x" : 3, "y" : 4]);
list

Map[] map = new Map[2];
map[0] = ["x" : 1, "y" : 2]
map[1] = ["x" : 3, "y" : 4]
map

def listOfMap = []
1.upto(10){
    listOfMap += ["test": it]
}
listOfMap