Question

i have 2 classes:

public class Super {

    public static <T> T bar(Class<T> clazz){

        try {
            return (T)(clazz.newInstance());
        } catch (IllegalAccessException e) {           
            e.printStackTrace();
        } catch (InstantiationException e) {           
            e.printStackTrace();
        }
        return null;
    }
}

and

public class Sub extends Super{

    public static void main(String[] args){
        Sub s = Sub.bar(Sub.class);

    }
}

now i don’t want to use Class<T> clazz as a param of bar, so how can i return the generic type T, thanks.

Answer 1

You can’t. Generics are only compile-time and are not available run-time. Thus, you’ll have to provide the Class clazz in order to know the T at runtime.