Effective Java - Chapter 5 Generics

1. Dont' use raw type in new code
   
2. Eliminate unchecked warnings- Always use the Suppress-Warnings annotation on the smallest scope possible
   
   
3. Prefer lists to ararys
   - Arrays check type at runtime, generics check type at compile time
   - type reified / type erasure
   - can't create generic type array => type not safe because of type erasure
   - type erasure: 不能直接 new E[], new List[], new List[] (non-reifiable type)
   因為runtime沒辦法保證Array裡面存在一致的物件
   
   
4. Favor Generic Type
   - 盡量使用Generic Type，而不要讓Client端自己cast
   
   
5. Favor Generic Method
   - type inference
   - for static factory method
   - recursive type bound
   
   
6. Use bounded wildcards to increase API flexibility
   - PECS
   - 如果Signature中只有一個type parameter, 就用wildcard
   
   
7. Consider typesafe heterogeneous containers
   
   

Help:

Class.asSubClass

Class.cast