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How do you left pad an int with zeros when converting to a String in java?

I'm basically looking to pad out integers up to 9999 with leading zeros (e.g. 1 = 0001).

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I use  java.lang.String.format(String, Object...)  to pad an integer with zeros on the left like this:

String.format("%03d", mynumber);

for zero-padding with a length of 3. For hexadecimal output replace the d with an x as in "%03x".

To read more about this format click here.