How to cast/convert a Stack of Integers to an Array of doubles?

I have a Stack of Integers. I need开发者_如何学编程 an array of doubles.

I know stack has Stack#toArray, but this returns an Object array.

How is this done?

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Generally, arrays of a concrete types are obtained like that:

Integer[] array = stack.toArray(new Integer[stack.size()]);

But since you need to change the type of the array, you'd better iterate:

int i = 0;
double[] doubles = new double[stack.size()];
for (Integer value : stack) {
    doubles[i++] = value.doubleValue();
}

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You can't do that unless you do it iteratively.

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i think that you can cast the Object array returned by the Stack#toArray iteratively to integer...