Get type of a generic parameter in Java with reflection

Question

Is it possible to get the type of a generic parameter?

An example:

public final class Voodoo {
    public static void chill(List aListWithTy         


        

Answer 1

Here is another trick. Use a generic vararg array

import java.util.ArrayList;

class TypedArrayList extends ArrayList
{
    @SafeVarargs
    public TypedArrayList (E... typeInfo)
    {
        // Get generic type at runtime ...
        System.out.println (typeInfo.getClass().getComponentType().getTypeName());
    }
}

public class GenericTest
{
    public static void main (String[] args)
    {
        // No need to supply the dummy argument
        ArrayList ar1 = new TypedArrayList<> ();
        ArrayList ar2 = new TypedArrayList<> ();
        ArrayList ar3 = new TypedArrayList<> ();
    }
}