Effective Java - Chapter 11 Serialization

defaultReadObject/defaultWriteObject

1. Serialization
   - serialized form and UID
   - another constructor
   - 提供parameterless constructor以便subclass可以serializable, 用AtomicReference確保subclass有正確的initiate
   
   
2. Use a custom serialized form
   - don't use default without consideration
   - 只寫出logic representation
   - 通常custom會較快
   - always invoke defaultReadObject/defaultWriteObject
   - Hashtable的default form甚至會error !!
   - always use serial version UID
   
3. Write readObject methods defensively
4. Use enum to instance control
5. 當需要自己寫readObject/writeObject時, 可考慮使用Serialization Proxy
   

Effective Java - Chapter 10 Concurrency

1. Use Synchronize access to shared mutable data
   - synchronize除了用來防止同時更改資料，也是用來保證會讀取到最新資料
   - synchronize要設在get與update
   - volatile
2. 不要過度使用Synchronize
   - alien => 只synchronize必要的部份, synchoronize越少越好 open call
   - 使用CopyOnWriteArrayList/Set
   - 讓client決定是否synchronize, 除非你自己有把握做的更好
   - static field一定要synchronize
3. Prefer executors
   - ExecutorService提供許多好用的機制
4. Prefer concurrency utilities to wait and notify
   - ExecutorService
   - Concurrent collections
   - CountDownLatch / Semaphore, CyclicBarrier / Exchanger
   - The standard idiom for using the wait method
   - Private lock object idiom
5. Any program that relies on the
   thread scheduler for correctness or performance is likely to be nonportable
6. thread groups are obsolete
   

Effective Java - Chapter 6 Enums & Annotations

1. Use enums instead of int constants
   - instance controlled
   - a generalization of singletons
   - 可提供各種物件化的programming
   - enum的method多被為private or package private
   - constant-specific method implementations
   - strategy enum pattern
   - valueOf, toString(), fromString()
2. Use EnumSet, EnumMap
3. Annotation
   - Retention
   - Target
   - Parameter
4. Override
5. Mark interface
   
   

Effective Java Chapter 9 Exception

1. Use exception only for exceptional conditions
- Good API design 要提供讓client檢查狀態的API

2. checked exception and runtime exception

3. 盡量避免不必要的checked exception
- Client方便
- 可將checked轉成 unchecked

4. Favor use standard exception
- IllegalArgumentException
- IllegalStateException
- NullPointerException
- IndexOutOfBoundException
- ConcurrentModificationException
- UnsupportedOperationException

5. Throw exceptions appropriate to the abstraction
- exception translation
- exception channing

6. Document all excepion

7. Include failure-capture information in detail message
- 包裝有用的資訊
- 需要自己改寫Exception

8. 維持Exception的原子性
- Object immutable
- rollback
- check first

9. Don't ignore it