import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    import java.util.stream.Collectors;
     
    class Test {
        public static void main(String[] args) {
            List<String> strings = new ArrayList<>();
            List<Item> items = strings.stream().map(tqsScore -> new Item(new HashMap())).collect(Collectors.toList());
        }
    }
     
    class Item {
        public Map<String, String> metadata;
     
        Item(Map<String, String> metadata) {
            this.metadata = metadata;
        }
    }