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Is it possible to overload a field type to be another field type?
If so, would it be possible to provide some examples?
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You can't overload fields (only methods can be overloaded), you might be confused with overriding fields - which anyway is not possible, you end up hiding the fields from superclasses.
Fields can't be overridden; they're not accessed polymorphically in the first place - you're just declaring a new field in each case. It compiles because in each case the compile-time type of the expression is enough to determine which field called number you mean.
The practice of defining more than one method in a class with same name is called method overloading.
You can't overload fields (only methods can be overloaded), you might be confused with overriding fields - which anyway is not possible, you end up hiding the fields from superclasses. Take a look at this post.
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