A small problem with the List and other sets was discovered after half a year of entry. My mind is not good. I have been listing for half a year.

A small problem with the List and other sets was discovered after half a year of entry. My mind is not good. I have been listing for half a year.

Well, I just found out recently that what is stored in the collection is actually the address in the first place, so the address is stored, how can I change the specific value in the address?

Here, we will use list to raise chestnuts.

Well, after placing the model into the list, the attribute of the model will be changed, and the list address will definitely remain unchanged ...... It will take a long time to write programs ....