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