How can I improve eclipse code completion?

Eclipse does not find the correct variable for code completion as shown below.

int i = 0;
f(xyz);    // f takes an int but eclipse won't fill it with i.

Solution

Under "Window" > "Preferences" > "Java" > "Editor" > "Content Assist", make sure "Fill method arguments and show guess arguments" is set and "Insert best guessed arguments" is selected.

Edit:

I tried this in my Eclipse (Version: Helios Service Release 1 - Build id: 20100917-0705):

public class BestGuessedParameter {
    static int xyz = 1;
    static void f(final int xyz) {
    }
    public static void main(final String[] args) {
        final int i = 0;
        f/*cursor here*/
    }
}

Right after I typed the f, I hit space and selected f(xyz), Eclipse did supply f(i) with i highlighted and in a pop-down menu of i (highlighted), xyz, and 0. i was the default.

I couldn't find any info on how Eclipse selects the "best guessed parameters" (I have no idea where to look in the Eclipse source). I would guess that Eclipse "guesses" based on type, name, and visibility, and that Eclipse thinks there's a better match than your local variable. Perhaps if the local variable were closer in type and name, it would be a better match?