Widening and Boxing Java primitives

Question

Widening and Boxing Java primitives.

I know it is not possible to widen a wrapper class from one to another as they are not from the same inheritence tree. Why thou

Answer 1

If we allow too many magic conversions, it'll get very confusing.

The existing conversion rules are already more than people care to understand. Even the language spec got it wrong! See this funny example Java casting: is the compiler wrong, or is the language spec wrong, or am I wrong?