取12个月

public class Test {

    private static List<Shop> shopList = new ArrayList<>();

    private static List<List<Shop>> shopListList = new ArrayList<>();

    public static void main(String[] args) {
        te("2019");
        te("2018");
        setParam();
        filter();
    }

    public static HashMap te(String year){
        HashMap<Object, Object> map = new HashMap<>();
        for (int i=1; i<=12; i++){
            String month = "";
            if (i<10){
                month = year + "0" + i;
            }else {
                month = year + i;
            }
            map.put(i,month);
        }
        Set<Object> set = map.keySet();
        for (Object a : set){
            Object o = map.get(a);
            System.out.println(a+"--"+o);
        }
        return map;
    }
}