when you copy a package from one project to another, do you find that several layers are missing from the package copied to the target project?
this means that the package we copied in the past only fetched the last package.
for example, if you copy the package of com.weigugou.pojo to another project, the only package left in the target project is pojo. Where"s his whole package? Why not the result we want. By the way, my development tool is idea 2017.3