Can I do arithmetic operations on the Number baseclass?

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Number does not have a + operator associated with it, nor can it since there is no operator overloading.

It would be nice though.

Basically, you are asking java to autobox a descedant of Number which happens to include Integer, Float and Double, that could be autoboxed and have a plus operator applied, however, there could be any number of other unknown descendants of Number that cannot be autoboxed, and this cannot be known until runtime. (Damn erasure)

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