Decompose Conditional...................................................................................... 192
Consolidate Conditional Expression................................................................. 194
Consolidate Duplicate Conditional Fragments ................................................ 196
Remove Control Flag........................................................................................... 197
Replace Nested Conditional with Guard Clauses........................................... 201
Replace Conditional with Polymorphism .......................................................... 205
Introduce Null Object ........................................................................................... 209
Introduce Assertion.............................................................................................. 216
Chapter 10. Making Method Calls Simpler........................................................... 220
Rename Method................................................................................................... 221
Add Parameter...................................................................................................... 222
Remove Parameter.............................................................................................. 223
Separate Query from Modifier............................................................................ 225
Parameterize Method .......................................................................................... 228
Replace Parameter with Explicit Methods........................................................ 230
Preserve Whole Object ....................................................................................... 232
Replace Parameter with Method ....................................................................... 235
Introduce Parameter Object ............................................................................... 238
Remove Setting Method...................................................................................... 242
Hide Method.......................................................................................................... 245
Replace Constructor with Factory Method....................................................... 246
Encapsulate Downcast........................................................................................ 249
Replace Error Code with Exception .................................................................. 251
Replace Exception with Test .............................................................................. 255
Chapter 11. Dealing with Generalization.............................................................. 259
Pull Up Field .......................................................................................................... 259
Pull Up Method ..................................................................................................... 260
Pull Up Constructor Body.................................................................................... 263
Push Down Method.............................................................................................. 266
Push Down Field .................................................................................................. 266
Extract Subclass................................................................................................... 267
Extract Superclass ............................................................................................... 272
Extract Interface ................................................................................................... 277
Collapse Hierarchy............................................................................................... 279
Form Template Method....................................................................................... 280
Replace Inheritance with Delegation................................................................. 287
Replace Delegation with Inheritance................................................................. 289
Chapter 12. Big Refactorings ................................................................................. 293
Tease Apart Inheritance...................................................................................... 294
Convert Procedural Design to Objects ............................................................. 300
Separate Domain from Presentation................................................................. 302
Extract Hierarchy.................................................................................................. 306
Chapter 13. Refactoring, Reuse, and Reality...................................................... 311
A Reality Check .................................................................................................... 311
Why Are Developers Reluctant to Refactor Their Programs? ...................... 312
A Reality Check (Revisited)................................................................................ 323
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