Add leading zeroes in Java

Add leading zeroes in Java - Stack Overflow: "Since Java 1.5 you can use the String.format method. For example, to do the same thing as your example:

    String format = String.format("%%0%dd", digits);
    String result = String.format(format, num);
    return result;

In this case, you're creating the format string using the width specified in digits, then applying it directly to the number. The format for this example is converted as follows:

%% --> %
0 --> 0
%d -->
d --> d
So if digits is equal to 5, the format string becomes "%05d" which specifies an integer with a width of 5 printing leading zeroes. See the java docs for String.format for more information on the conversion specifiers"

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