Java Type Erasure Problem

Question

I\'ve made an example to demonstrate my problem:

Metrical.java

public interface Metrical
{
    double distance(T other);
}

Answer 1

Sadly, this is the major area where Java Generics falls down... there is just no good solution.

I've generally resorted to making a new class, with the interface as Set>, but that wraps Set> (without extending it, which would cause the same problem).