Question

Possible Duplicate:
Java generics constraint require default constructor like C#

I want to set a constraint to type T that it must have a constructor without parameters. In C# it will be like:


public interface Interface<T> where T : new() { }


Is this feature available in Java?

Update: Is there some trick to make generic type T have a constructor?

Answer 1

Answering your updated question: only class can have a constructor in Java, T – is a type literal, it is not necessary has to be a class. During runtime using reflection you can check if your class is a ParameterizedType has a parameter that is actually a class and if it has an empty constructor.