Comparable vs Number, Design choice

Question

I have a class which have a structure like

class A {
    String key;
    Double value;
}

Now the value could be double, long, int, fraction and so on.

How should I handle this in the same class?

Shall I make value a Comparable or Number?

Number as these values are extending Number, Comparable as i want this class [and value] to be comparable.

Answer 1

I suggest you to make the class with a generic type <T extends Number>.

class A<T extends Number> {
    String key;
    T value;
}