revised preface about 2/e

Author: ChrisMayfield

ch00.tex

@@ -89,38 +89,39 @@ \section*{Changes to the 2nd edition}
 
 We reordered the material in Chapter~1 to present a more interesting balance of theory and practice.
 Chapters 2--3 are much cleaner now too.
-The material on if statements and logic operators has been moved to Chapter 4 with additional in-depth examples.
+The material on if statements and logic operators has been moved to Chapter 4, along with additional in-depth examples.
 
 \item[Chapters 5--8:]
 
 These chapters received the most attention.
 We rearranged the content, added many examples and new figures, and removed unnecessary details.
 Methods are now presented in a single chapter, and strings are covered earlier (before arrays) so that readers can apply them to loop problems.
-The material on recursion was moved to its own chapter, and we added new sections to explain binary numbers in more detail.
+The material on recursion is now a chapter, and we added new sections to explain binary numbers and CodingBat problems.
 
 \item[Chapters 9--12:]
 
 Our main goal for these chapters was to provide better explanations and more diagrams.
-The content is largely the same, but it should be easier to understand now.
+Chapters~9 and 10 focus more on immutable vs mutable objects, and we added new sections on BigInteger and StringBuilder.
+The other content is largely the same, but it should be easier to understand now.
 
 \item[Chapters 13--16:]
 
-We balanced the amount of content in Chapters~13--14 by moving ArrayLists earlier.
-Chapters~15--16 are brand new in this edition, and they cover more advanced topics like interfaces, polymorphism, and multi-dimensional arrays.
+We balanced the amount of content in Chapters~13--14 by moving ArrayLists earlier, and we implement the ``War'' card game as another example.
+Chapters~15--16 are brand new in this edition, and they cover more advanced topics including interfaces, polymorphism, and multi-dimensional arrays.
 
 \item[Appendixes:]
 
 We added Appendix~\ref{javadoc} to explain documentation comments and Javadoc in more detail.
 %Most of the examples in the chapters do not include documentation comments to save space.
-The other three appendixes, which were present in the first edition, have been revised for clarity and layout.
+The other three appendixes that were present in the first edition have been revised for clarity and layout.
 
 \end{description}
 
 
 \section*{About the appendixes}
 
 The chapters of this book are meant to be read in order, because each one builds on the previous one.
-We also include four appendixes with material that can be read at any time:
+We also include several appendixes with material that can be read at any time:
 
 \begin{description}
 
@@ -132,17 +133,22 @@ \section*{About the appendixes}
 \item{\bf Appendix B: Javadoc}
 
 It's important to document your classes and methods so that other programmers (including yourself in the future) will know how to use them.
-This appendix explains how to read documentation, how to write documentation, and how the Javadoc tool works.
+This appendix explains how to read documentation, how to write documentation, and how to use the Javadoc tool.
 
 \item{\bf Appendix C: Graphics}
 
 Java provides libraries for working with graphics and animation, and these topics can be engaging for students.
-The libraries require object-oriented features that readers will not completely understand until after Chapter~\ref{mutable}, but they can be used much earlier.
+The libraries require object-oriented features that students will not completely understand until after Chapter~\ref{mutable}, but they can be used much earlier.
 
 \item{\bf Appendix D: Debugging}
 
-We provide debugging suggestions throughout the book, but we also collect our debugging advice in an appendix.
-We recommend that readers review this appendix several times as they work through the book.
+We provide debugging suggestions throughout the book, but we also have an appendix with many more suggestions on how to debug your programs.
+We recommend that readers review this appendix frequently as they work through the book.
+
+\item{\bf Appendix E: Extras}
+
+With each new edition, we add new material, remove old material, and revise everything else.
+Some of the old material may still be useful, so rather than delete it, we moved it to this appendix.
 
 \end{description}