This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Can someone explain each of these for me, example will also be appreciated:
- Primitive widening uses the "smallest" method argument possible. ???
- Used individually, boxing and var-args are compatible with overloading. ???
- You CANNOT widen from one wrapper type to another. - I got it, you can't widen Integer to Long, Byte to Integer, etc, because they're objects (unlike primitives) and do not extend each other.
- You CANNOT widen and then box. - I got it. Say there's a byte 5, you can't pass it on Integer, hoping that byte will be widen to int and then will box to Integer, it doesn't work that way.
- You can box and then widen. - I got it. You can convert byte 5 to Byte, and then widen Byte to Object since all classes extends Object. If there's more to it, please let me know.
- You can combine var-args with either widening or boxing. ???