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本書介紹瞭在java編程中78條經典的、實用性極高的經驗規則，這些經驗規則可以幫助開發人員來解決每天都有可能麵對的大多數問題。書中對java平颱設計專傢所使用的技術的介紹，揭示瞭如何事半功倍地的編寫清晰、健壯和高效的代碼。本書是經典圖書effective java的第2版，涵蓋瞭java 5中的重要變化，並刪除瞭一些過時的內容。本書所介紹的每條規則，都以簡明易懂的語言來闡釋，並通過示例代碼進一步加以說明。

本書內容翔實，層次分明，是一本可以幫助技術人員更深層次理解java的參考用書。

Joshua Bloch是Google公司的首席Java構架師，也是Jolt圖書大奬的獲得者。他曾是Sun公司的傑齣工程師和Transarc公司的高級係統設計師。Bloch帶領著他的優秀團隊，設計和實現過無數的Java平颱特性，包括JDK5．0語言增強版和獲奬的Java Collections Framework。

1　introduction 　1
2　creating and destroying objects　5
item 1: consider static factory methods instead of constructors　5
item 2: consider a builder when faced with many constructor parameters　11
item 3: enforce the singleton property with a private constructor or an enum type　17
item 4: enforce noninstantiability with a private constructor　19
item 5: avoid creating unnecessary objects　20
item 6: eliminate obsolete object references　24
item 7: avoid finalizers　27
3　methods common to all objects　33
item 8: obey the general contract when overriding equals　33
item 9: always override hashcode when you overrideequals　45
item 10: always override tostring　51
item 11: override clone judiciously　54
item 12: consider implementing comparable　62
4　classes and interfaces　67
item 13: minimize the accessibility of classes and members 67
item 14: in public classes, use accessor methods, not public fields　71
item 15: minimize mutability　73
item 16: favor composition over inheritance　81
item 17: design and document for inheritance or else prohibit it　87
item 18: prefer interfaces to abstract classes　93
item 19: use interfaces only to define types　98
item 20: prefer class hierarchies to tagged classes　100
item 21: use function objects to represent strategies　103
item 22: favor static member classes over nonstatic　106
5　generics　109
item 23: don't use raw types in new code　109
item 24: eliminate unchecked warnings　116
item 25: prefer lists to arrays　119
item 26: favor generic types　124
item 27: favor generic methods　129
item 28: use bounded wildcards to increase api flexibility　134
item 29: consider typesafe heterogeneous containers　142
6　enums and annotations　147
item 30: use enums instead of int constants　147
item 31: use instance fields instead of ordinals　158
item 32: use enumset instead of bit fields　159
item 33: use enummap instead of ordinal indexing　161
item 34: emulate extensible enums with interfaces　165
item 35: prefer annotations to naming patterns　169
item 36: consistently use the override annotation　176
item 37: use marker interfaces to define types　179
7　methods　181
item 38: check parameters for validity ..　181
item 39: make defensive copies when needed　184
item 40: design method signatures carefully　189
item 41: use overloading judiciously　191
item 42: use varargs judiciously　197
item 43: return empty arrays or collections, not nulls　201
item 44: write doc comments for all exposed api elements　203
8　general programming　209
item 45: minimize the scope of local variables　209
item 46: prefer for-each loops to traditional for loops　212
item 47: know and use the libraries　215
item 48: avoid float and double if exact answers are required　218
item 49: prefer primitive types to boxed primitives　221
item 50: avoid strings where other types are more appropriate　224
item 51: beware the performance of string concatenation　227
item 52: refer to objects by their interfaces　228
item 53: prefer interfaces to reflection　230
item 54: use native methods judiciously　233
item 55: optimize judiciously　234
item 56: adhere to generally accepted naming conventions　237
9　exceptions　241
item 57: use exceptions only for exceptional conditions　241
item 58: use checked exceptions for recoverable conditions and runtime exceptions for programming errors　244
item 59: avoid unnecessary use of checked exceptions　246
item 60: favor the use of standard exceptions　248
item 61: throw exceptions appropriate to the abstraction　250
item 62: document all exceptions thrown by each method　252
item 63: include failure-capture information in detail messages　254
item 64: strive for failure atomicity　256
item 65: don't ignore exceptions　258
10　concurrency　259
item 66: synchronize access to shared mutable data　259
item 67: avoid excessive synchronization　265
item 68: prefer executors and tasks to threads　271
item 69: prefer concurrency utilities to wait and notify　273
item 70: document thread safety　278
item 71: use lazy initialization judiciously　282
item 72: don't depend on the thread scheduler　286
item 73: avoid thread groups　288
11　serialization　289
item 74: implement serializable judiciously　289
item 75: consider using a custom serialized form　295
item 76: write readobject methods defensively　302
item 77: for instance control, prefer enum types toreadresolve　308
item 78: consider serialization proxies instead of serialized instances　312
appendix: items corresponding to first edition　317
references　321
index 　327
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