Get value data sorted by key in map

The item you are doing today encounters the value data that gets sorted by key in the map, and what is saved in key is the string type. Map of the knowledge point for a long time useless a little rusty, do not know how to use. Looking at the map of the previous colleague's code based on key, it was found that he first took the key out to encapsulate it in a list, then sorted the list by the Collections.sort method, and removed the value order in order to add to a new list. Feel this way of cycle too much, so the internet to find can directly sort of method, see someone write directly saved to TreeMap in the data can be implemented according to the function of sorting. So the experiment was a bit. The output looks so sure.

Get value data sorted by key in map