Generic interface methods

Question

The problem is that I want a generic interface that has a method that returns type T. And concrete implementations specify the type T and the method body.
Given the interface and class below, why do I get an unchecked conversion warning, and how do I eliminate it? Or is there an alternative?
Warning displayed by eclipse:
Type safety: The return type String of the method convert(String) of type AsciiStringConverter needs unchecked conversion to conform to the return type T of inherited method.
This code compiles...
public interface StringConverter<T>
    public T convert(String string);
public class CharacterValueConverter implements StringConverter<int[]>
    public int[] convert(String string) //unchecked conversion warning
        int[] values = new int[string.length()];
        for (int i = 0; i < string.length(); i++)
            values=(int)string.charAt(i);
return values;
Thanks,
C.

Answer 1

Here is the code that is used to test the CharacterValueConverter...
public class Test
    public static void main(String[] args)
        int[] values = new CharacterValueConverter().convert("abc");
        for(int i : values)
            System.out.println(i);
}