java8 Stream 获取 JsonArray 某一字段的值
JSONArray feeItems ;
String fees_item = feeItems.stream()
.filter(t -> ((JSONObject) t).getString(“age”).equals(“18”))//根据条件过滤
.map(t -> ((JSONObject) t).getString(“fees_item”)) //获取某一字段字符串
.distinct() //去重
.collect(Collectors.joining(“,”, “”, “”)); // 输出字符串