In Java how do you pass a String format variable placeholder to another String formatter?

Question

I have a String formatter like this:

String testLogMessage = String.format("testing %s scenario %s", "BIG");
logger.info(String.format(testLogMessage, 1));

I have several tests and want to pass a number into my testLogMessage. At runtime I get this exception:

java.util.MissingFormatArgumentException: Format specifier '%s'
    at java.util.Formatter.format(Unknown Source)
    at java.util.Formatter.format(Unknown Source)
    at java.lang.String.format(Unknown Source)

I could use a second string formatter, but is there another way to do this?

rgettman · Accepted Answer · 2015-03-18 16:42:09Z

3

The first call to String.format expects both placeholders to be satisfied, but you only pass one value, prompting the exception.

To have the resulting string contain a placeholder for the next call to String.format, you can escape the % sign with another % sign.

'%' percent The result is a literal '%' ('\u0025')

String testLogMessage = String.format("testing %s scenario %%s", "BIG");

This will result in the string "testing BIG scenario %s", which you can use in the second String.format call. You'll want it to be a %d so you can pass an int.

String testLogMessage = String.format("testing %s scenario %%d", "BIG");

answered Mar 18, 2015 at 16:42

rgettman

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