What is happening right now?

I finally found the problem. Thanks.

You could set each element into the double array as follows: <Code Omitted>But, probably better might be to code the double array elements as follows: <Code Omitted>

I suggest that you add a new class. A subclass of Actor called Ground that can be extended to all the objects that your character can stand or bop its head on (Floor1, Platform and Platform2). That way you only need to check for the Ground class instead of checking all three different types separately. Same for the collision offsets -- for each direction, you would only need one check for Ground class).

I do not believe that the java.awt package is usable on the site due to javascript security reasons. That means the GifImage class will not work in the browser.