Binary search trees using java school project

This is a simple java school project the description of the excersize is below A book warehouse company supplies books to bookstores in different towns and villages of the country. For better supplying and support of the stores the company has big warehouses with books that it has in some key locations in the country. The company periodically decides if it has to make new warehouses (on new towns or new warehouse in a town it already has another) and if it is good to shut down a warehouse. So it is necessary to have a data structure that can hold the info about books that are in each warehouse. The company has decided to create the data structure using randomized binary search trees. I wil name all the methods that need to be created, there is ready source code provided in order to continue the project and there is no ui, everything is from command line and there are no requirements for permanet storage of the data