Text Processing

java.io Library

• http://java.sun.com/j2se/1.5.0/docs/api/
  • provides the ability to do input and output
  • byte, character, buffered, data, and object streams
  • BufferedReader - read a line of text at a time
  • PrintWriter - output methods similar to System.out
  • File - represents a file or directory
• CopyLines.java
  • handling exceptions
  • the finally block
  • FileNotFoundException

String Manipulation

How would you modify CopyLines to replace all instances of the word super with the word ultra?

• String objects are immutable -- they cannot change
• StringBuffer - a mutable sequence of characters
• StringBuilder - also a mutable sequence of characters
• StringBuilder is not thread safe. It is more efficient when the string is accessed by a single thread, but should not be used when multiple threads modify the same object.
• String - methods return the new string (a different object)
  • replaceAll
  • split
  • substring
• Regular expressions
• Pattern
  • *, +, ?
  • Exercise: find and replace all phone numbers of the form (123)456-7890 with XXX.