Object objPass = userMap.get (user name); What do you mean? Professional answer.

Object is the parent class of all classes, userMap is the new Map collection, username is the variable for storing the Map collection, and the get (key value) method of the Map is to obtain the data of the key value specified in the Map;

So this code is: assign the value with the key value username in the userMap collection to the Object objPass defined by the object.

Because Object is the parent class of all classes and belongs to upward transformation, it is not used when assigning the value in Map to Object (forced transformation)