Fixed decimal numbers with JAVA

How do I represent numbers in the format

001 = 1
002 = 2
003 = 3
010 = 10
020 = 20

The number of 开发者_Go百科 digits is always 3.

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If you want to output integers such that they always have leading zeros, use String.format with a zero before the number of digits in the format string, for example:

int i = 3;
String s = String.format("%03d", i);
System.out.println(s);

Gives the output:

003

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Integer.valueOf("020") is sufficient for your purpose. It will give you 20 as a result. After that you can use it as Integer, int or String.

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You can use something like this

DecimalFormat decimalFormat = new DecimalFormat();
decimalFormat.setMinimumIntegerDigits(3);
System.err.println(decimalFormat.format(2));

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Am I missing something obvious here?

String  num_str = "001"
Integer val     = Integer.parseInt(num_str);
String  answer  = val.toString();