I have following class:
public class AClass<T extends XYZClass> extends BFunction<DTOClass, T>{
@Override
public <T extends XYZClass> T apply(DTOClass input) {
return null;
}
}
where T is generic Type, BFunction is function that implements com.google.common.base.Function with apply method. The problem is that this class declaration construction is invalid, because it corresponds following apply method:
@Override
public T apply(DTOClass input) {
return null;
}
I also tried:
public class AClass extends BFunction<DTOClass, <T extends XYZClass> T>{
@Override
public <T extends XYZClass> T apply(DTOClass input) {
return null;
}
}
but this syntax is invalid. Could you advise me how to correct my class declaration?
Remove the type variable declared on the method:
public class AClass<T extends XYZClass> extends BFunction<DTOClass, T>{
@Override
public /* remove this */ T apply(DTOClass input) {
return null;
}
}
You're trying to declare another type variable called T
which hides the type variable declared on the class.
You are declaring a generic method in your parent class, where the <T extends XYZClass>
clause has nothing to do with the <T extends XYZClass>
in your class declaration.
What you likely want to do is remove <T extends XYZClass>
from your method declaration and overrides altogether.
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