java left integer pad with zero

How can I get an Integer to be two digits. If it's under 10 it would show 01,02, etc. I want to keep the Integer as an Integer. String.format gives a string. How can I do this with Decimalformat for ex

Decimalformat df = new Decimalformat(???);

If you want to keep the value as an int or Integer, there's nothing to be done here. A number doesn't have a format - it just has a value. For example, an int isn't "in decimal" or "in hex" or "in binary" - if you write

int x = 16;
int y = 0x10;

those are the exact same values.

The idea of "padding" only makes any sense when it comes to a textual representation of the number - which is when you end up with a string.

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