I understand why I'm unable to pass in the parameter InterestPoint<M>
to the second method because of its static nature, but why does an error occur when I try to declare it as the return type? Removing the type parameter fixes this but then I'm left with the warning: Raw use of parametrized class 'InterestPoint'.
public record InterestPoint<M>(Coordinate coordinate, M marker) {
public final InterestPoint<M> validate() {
return this;
}
public static final InterestPoint<M> validate(InterestPoint interestPoint) {
interestPoint.validate();
return interestPoint;
}
}
The M
generic type parameter belongs to an instance, whereas a static method doesn't belong to a specific instance, but to a class. The way to have a static method return a generic type is to add a type parameter to it directly. E.g.:
public static final <N> InterestPoint<N> validate(InterestPoint<N> interestPoint) {
interestPoint.validate();
return interestPoint;
}