Surely the thing that's important here is that text data is being used to key the "array" in PHP. Java arrays are not "associative arrays" and can only have integer indexes.
In Java, you should use Collections in preference to arrays, in most code. To mimic a PHP associative array with text keys, you might like a HashMap<String, Object>. (Replace the Object by the type of the value, if it is more specific than Object).
Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.