Switch statements can often be replaced by a good OO design.
For example, you have an Account class, and are using a switch statement to perform a different calculation based on the type of account.
I would suggest that this should be replaced by a number of account classes, representing the different types of account, and all implementing an Account interface.
The switch then becomes unnecessary, as you can treat all types of accounts the same and thanks to polymorphism, the appropriate calculation will be run for the account type.
