Java getting array keys.

Is there an equivalent function to array_keys in Java? Either in the form of arrays or array lists.
I am trying to get all the keys of a certain level from a multidimensional array of N depth. I have a way to do it in PHP and part of it is the array_keys function. Maybe there is a better way to achieve this in Java. I dont know the elements of the array as it is tree being built recursively on the fly.

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