java - 将 List 转换为 List

Question

 List<Object[]> listChild = query.list();
 List<ChildrenDTO> listOfDTO = new ArrayList<>();

 //Loop through arraylits of object
 for(Object[] org: listOrg){
      //How to cast List of object to ist<ChildrenDTO>?
     listOfDTO.add(org);
 }

I am looping through a list of objects and need to return listOfDTO. How to I cast the list to List?

Answer 1

如果你使用java 8，你应该尝试一下stream api。

考虑到，DTO 的构造函数有一个 String 参数。

List<Object[]> listChild = query.list();
List<ChildrenDTO> children = listChild.stream().map(x -> new ChildrenDTO(x[0].toString())).collect(Collectors.toList());