public static void main(String[] args) {

        Map<String,Object> oneMap = new HashMap<>();

        oneMap.put("key","001");

        oneMap.put("name","张飞");

        oneMap.put("age","25");

        Map<String,Object> twoMap = new HashMap<>();

        twoMap.put("key","001");

        twoMap.put("School","桃园");

        twoMap.put("age","25");

        List<Map<String,Object>> listA = new ArrayList<>();

        listA.add(0,oneMap);

        List<Map<String,Object>> listB = new ArrayList<>();

        listB.add(0,twoMap);

        listA.forEach(a -> {

            listB.forEach(b -> b.putAll(a));

        });

        listB.forEach(b -> b.entrySet().forEach(e -> System.out.println(e.getValue())));

    }