CSC152 2006S, Class 7: Strings

Admin:
* Extra credit for attending today's "Opportunities in CS" talk.  I'll
  be done by 5:00 and the talk will be done by 5:30.
* No, you don't need to turn in the first few labs.
* Reading for Friday: Numbers.
* Homework for Friday: HW4: MadLibs, Revisited
* Don't forget casual Friday!
* When Eclipse doesn't want to start, try the following
        % cd
        % source .bash_profile
        % rm -rf .eclipse
        % eclipse

Overview:
* Reflections on homework
* The two-minute introduction to strings.
* Lab
* Reflections

What you should have learned in the reading:
* String is a class in Java
* Strings in Java are much like strings in Scheme (and C++)
  * Sequences of characters
  * String constants are written with "....."
* Strings are objects, and therefore provide methods
  String str;
  str = ...;
  str.indexOf("hello");
  str.subString(1,10);
  ...
  pen.println("'twas brillig and the slighty toves".substring(4,10))
* Strings are immutable: substring, replace, append all create
  *new* strings.
* When you want to mutate a string, use StringBuffer