java中怎样去除list中重复的数据,并且显示重复数据的条数答:, "walipo", "day", "walipo", "legeand", "day", "douwbo", "day", "day");Map<String, Long> collect = list.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));System.out.println(collect);最后返回的Map就是以字符串为key,value为其个数 ...
java中将Map<String,Object>类型数据添加到List<Map<String,Object>>类 ...答:Map<String, Object> map = new HashMap<String, Object>();map.put("aaa", new Object());map.put("bbb", new Object());map.put("ccc", new Object());List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();list.add(map);for (Map<String, Object> map2 ...