List<Map<String, String>>只保留map中某些字段，其他字段删除

可以使用Stream API来实现这个功能，示例代码如下：

List<Map<String, String>> list = new ArrayList<>();
Map<String, String> map1 = new HashMap<>();
map1.put("name", "Alice");
map1.put("age", "20");
map1.put("gender", "female");
list.add(map1);
Map<String, String> map2 = new HashMap<>();
map2.put("name", "Bob");
map2.put("age", "30");
map2.put("gender", "male");
list.add(map2);

// 只保留 name 和 gender 字段
List<Map<String, String>> resultList =
        list.stream()
            .map(map -> {
                Map<String, String> resultMap = new HashMap<>();
                resultMap.put("name", map.get("name"));
                resultMap.put("gender", map.get("gender"));
                return resultMap;
            })
            .collect(Collectors.toList());

System.out.println(resultList);

输出结果为：

[{name=Alice, gender=female}, {name=Bob, gender=male}]