Final answer:
The keyword found in the header of a method that detects an error and generates an appropriate exception is 'throws'.
Step-by-step explanation:
The keyword found in the header of a method that could detect an error and generate an appropriate exception is throws. When a method may encounter an error that it cannot handle itself, it can declare this with the throws keyword, followed by the exception type. This alerts the calling method that it needs to handle the potential exception or propagate it further up the call chain.
The keyword 'throws' is used in the header of a method to indicate that it might throw an exception, signaling to the caller to handle it appropriately.
The keyword found in the header of a method that could detect an error and generate an appropriate exception is throws. When a method has the potential to encounter an error that it cannot handle, it should specify this possibility by using the throws keyword followed by the exception type it may throw. This signals to the caller of the method that they must handle the exception in some way, either by catching it using a try-catch block or by further propagating it using the throws keyword in its own method signature.