Create a game map that a java project received by file

I have to create a map of game. This map is composed by cities and streets that I can connect in different ways. Initially I thought to create a class for every different object of the map.. For instance a class city a class region and a class map.. But now I 'm thinking about the fact that a user has to decide the map from a set of maps and to click on the city to move and to built in it. So I have to implement the maps and then to map a click of the user for example to object of class city in java. I'm coding in java not for long time so can somebody help me? 😊