CODEWITHSUNDEEP
javastring
Keikoman
Keikoman

Reputation: 73

Android String.Format leading zeros issue

My string is "1" and i had to add leading zero. I'm using

if (mystring.length() == 1) { 
     mystring = String.format("%02d", mystring);
}

But I get:

java.util.IllegalFormatConversionException: %d can't format java.lang.String arguments

I also already tried with "%02f". Any idea why I'm getting this error ?

Upvotes: 1

Views: 755

Answers (2)

Doug Stevenson
Doug Stevenson

Reputation: 317362

Because the %d specifier requires an integer type value to format. If your string is actually a number, then parse it to a number first, then pass that to the formatter:

mystring = String.format("%02d", Integer.parseInt(mystring));

Upvotes: 2

ΦXocę 웃 Пepeúpa ツ
ΦXocę 웃 Пepeúpa ツ

Reputation: 48258

The error is because String.format("%02d", mystring); is expecting a decimal number... not a string, the same with %02f which means float

take a look to the doc

Upvotes: 0

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