重構：改善既有代碼的設計（評註版）

chapter 1 refactoring， a first example（新增批註共21條） 
the starting point 
the first step in refactoring 
decomposing and redistributing the statement method 
replacing the conditional logic on price code with polymorphism 
final thoughts 
chapter 2 principles in refactoring（新增批註共11條） 
defining refactoring 
why should you refactor？ 
when should you refactor？ 
what do i tell my manager？ 
problems with refactoring 
refactoring and design 
refactoring and performance 
where did refactoring come from？ 
chapter 3 bad smells in code （by kent beck and martin fowler）
（新增批註共17條） 
duplicated code 
long method 
large class 
.long parameter list 
divergent change 
shotgun surgery 
feature envy 
data clumps 
primitive obsession 
switch statements 
parallel inheritance hierarchies 
lazy class 
speculative generality 
temporary field 
message chains 
middle man 
inappropriate intimacy 
alternative classes with different interfaces 
incomplete library class 
data class 
refused bequest 
comments 
chapter 4 building tests（新增批註共2條） 
the value of self．testing code 
the junit testing framework 
adding more tests 
chapter 5 toward a catalog of refactorings
（新增批註共1條） 
format of the refactorings 
finding references 
how mature are these refactorings？ 
chapter 6 composing methods（新增批註共9條） 
extract method 

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