./Mediator.java:4: cannot find symbol
symbol  : class Shop
location: class Mediator
    Shop shop;
    ^
./Mediator.java:5: cannot find symbol
symbol  : class Purchase
location: class Mediator
    Purchase purchase;
    ^
./Mediator.java:6: cannot find symbol
symbol  : class Exit
location: class Mediator
    Exit exit;
    ^
./Mediator.java:11: cannot find symbol
symbol  : class Shop
location: class Mediator
        shop = new Shop(this);
                   ^
./Mediator.java:12: cannot find symbol
symbol  : class Purchase
location: class Mediator
        purchase = new Purchase(this);
                       ^
./Mediator.java:13: cannot find symbol
symbol  : class Exit
location: class Mediator
        exit = new Exit(this);
                   ^
6 errors