Programming and Problem Solving with Java

CASE STUDY

460

Scenarios:The processing takes place within the application class Rainfall: processing

a data set, writing the average, and repeating the process until no more data sites

remain. The class DataSetExceptionshould just pass the message sent to it on to its su-

perclass to be printed if the application ends with an error.Rainfallhas the responsibil-

ity to throw a DataSetExceptionif necessary.

CRC Cards:On the CRC card, we summarize RainFall’s responsibilities.

Class Name: DataSetException Superclass: Exception Subclasses:

Responsibilities Collaborations

Create itself

Pass message to super Super

Class Name: Rainfall Superclass: Object Subclasses:

Responsibilities Collaborations

Prepare the file for input FileReader, BufferedReader

Prepare the file for output FileWriter, PrintWriter

Process data BufferedReader

Throw exceptions if necessary DataSetException

Rainfall

input file

output file

DataSetException

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