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Add leading zeroes to number in Java? - Stack Overflow String format = String format("%0%d", 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
Add leading zeroes to number in Java? - W3docs To add leading zeroes to a number in Java, you can use the format method of the String class, along with a format string that specifies the desired length and padding character
java - How can I pad an integer with zeros on the left . . . - Stack Overflow Use java lang String format(String,Object ) like this: String format("%05d", yournumber); for zero-padding with a length of 5 For hexadecimal output replace the d with an x as in "%05x" The full formatting options are documented as part of java util Formatter
How to format a Java string with leading zero? - Stack Overflow This can be applied to your problem by dynamically adjusting the number of leading 0's in a format string: public String leadingZeros(String s, int length) { if (s length() >= length) return s; else return String format("%0" + (length-s length()) + "d%s", 0, s); }