JZTXT

java8 List 根据两个字段去重

发布时间 2023-04-27 15:14:01作者: 全琪俊
//先去重
Map<String, DigitalProductsUser> checkRelationMap = digitalProductsUserList.stream().filter(entity->ObjectUtil.isNotNull(entity.getProductsId())&&ObjectUtil.isNotNull(entity.getUserId())).collect(Collectors.toMap(arr -> String.valueOf(arr.getProductsId())+"-"+String.valueOf(arr.getUserId()), v -> v, (a, b) -> a));

if(ObjectUtil.isNotNull(checkRelationMap)){
            //Lamubda表达式遍历
            checkRelationMap.forEach((t,u)-> {
//                    System.out.println(t+"->>>"+u);
             
            });
         }