How can I pad an integers with zeros on the left?

2018-05-31 19:58:17

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

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

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 .

如果您出于任何原因使用pre 1.5 Java，那么可以尝试使用Apache Commons Lang方法

org.apache.commons.lang.StringUtils.leftPad(String str, int size, '0')

Let's say you want to print 11 as 011

You could use a formatter : "%03d" .

You can use this formatter like this:

int a = 11;
String with3digits = String.format("%03d", a);
System.out.println(with3digits);

Alternatively, some java methods directly support these formatters:

System.out.printf("%03d", a);

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