CS 211 Lab 5: Output, Inheritance, Censorship

CensoredWriter Overview

Occasionally in history there has arisen the need to censor communications. An automatic means of doing this is to scan output and block or replace certain key words that appear. We will set up a class CensoredWriter which performs this task: any output that contains a specified string pattern will have the pattern replaced by a censor string. The solution will involve

• Making CensoredWriter a child class of PrintWriter
• CensoredWriter will then have print and println methods
• CensoredWriter will change what the print and println methods do: it will transform input to them.
• Transformations will be done in a special transform() method of the CensoredWriter. This is a method that the parent class PrintWriter does not have.
• Transformations of output will utilize String class methods which will replace matched string patterns with the censored text
• Transformed text will be passed to the parent class print and println methods which will perform the printing.
• Several constructors for CensoredWriter will be provided so that output can be sent to the screen or to a file.
• All other methods of CensoredWriter will be inherited from PrintWriter and will behave identically to the parent class.
• The intended use for CensoredWriter is demonstrated below in an interactive session.
• A class which acts like a PrintWriter but filters output of certain string patterns. It has several required elements.
• Constructors to create CensoredWriters that write to System.out and to files. These constructors also accept a string pattern to censor.
• A transform() method which will transform input strings for output. This method is public to allow for testing but is primarily used internally.
• Overrides of print and println methods that transform() input text before calling the super class versions of these methods.

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