11 2021 档案

map 遍历
摘要：for (Map.Entry<String, Object> m : map.entrySet()) { System.out.println("key:" + m.getKey() + " value:" + m.getValue()); } 阅读全文
posted @ 2021-11-10 07:19 learning豪 阅读(43) 评论(0) 推荐(0)
Java统计List集合中每个元素出现的次数
摘要：public static Map<String,Integer> frequencyOfListElements( List items ) { if (items == null || items.size() == 0) return null; Map<String, Integer> ma 阅读全文
posted @ 2021-11-09 22:45 learning豪 阅读(2118) 评论(0) 推荐(0)
sql 片段写法
摘要：res_type_id,res_type 阅读全文
posted @ 2021-11-09 22:25 learning豪 阅读(34) 评论(0) 推荐(0)
循环依赖
摘要：java: Annotation processing is not supported for module cycles. Please ensure that all modules from cycle [backend-common,backend-user] are excluded f 阅读全文
posted @ 2021-11-03 16:37 learning豪 阅读(76) 评论(0) 推荐(0)