Tip - Java Exception designing

Use checked exceptions for recoverable conditions and runtime exceptions for programming errors:Runtime exceptions should be used only to indicate programming errors, such as precondition violations.
Use exceptions only for exceptional conditions:That is, do not use exceptions for control flow.
Avoid unnecessary use of checked exceptions: In other words, don’t use checked exceptions for conditions from which the caller could not possibly recover, or for which the only foreseeable response would be for the program to exit.
Throw exceptions appropriate to the abstraction:In other words, exceptions thrown by a method should be defined at an abstraction level consistent with what the method does, not necessarily with the low-level details of how it is implemented.