Comments on: java.util.IllegalFormatConversionException when using System.out.format()

By: Monu

Monu — Mon, 31 Jan 2011 12:17:30 +0000

import java.io.*;
class DemoReadline
{
public static void main(String args[]) throws IOException
{
BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
System.out.println(“enter id of the employee”);
int id = Integer.parseInt(br.readLine());
System.out.println(“enter sex of the employee”);
char ch=(char)br.read();
System.out.println(“enter name of the employee”);
String name= br.readLine();
System.out.printf(“num=%d%nchar=%c%nString=%s%n”+id,ch,name);
}
} wats the right syntax here,,,can anybody help me out….am a learner of java…its the exception…enter id of the employee
2
enter sex of the employee
m
enter name of the employee
num=Exception in thread “main” java.util.IllegalFormatConversionException: d != java.lang.Character
at java.util.Formatter$FormatSpecifier.failConversion(Unknown Source)
at java.util.Formatter$FormatSpecifier.printInteger(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.io.PrintStream.format(Unknown Source)
at java.io.PrintStream.printf(Unknown Source)
at DemoReadline.main(DemoReadline.java:13)

By: janzeh

janzeh — Tue, 16 Nov 2010 22:30:45 +0000

thaaaanks, my friend got an error and i couldnt figure what he had done wrong i knew it had something to do with the double.

By: Raja Nagendra Kumar

Raja Nagendra Kumar — Mon, 28 Dec 2009 12:22:22 +0000

As a addendum to the same error, we see the following can happen due to lack of conversion from long to float.

for a code like this

boolean lInMBSize = (sizeCount / CommonConst.MEGA_BYTES) > 0;
StringBuffer sb = new StringBuffer();
Formatter fm = new Formatter(sb);
fm.format(“\n%-16s\t%-6d\t%15.2f %s\t%-16d”,
ext,
fileCount,
lInMBSize ?
(sizeCount / CommonConst.MEGA_BYTES) :
(sizeCount / CommonConst.KB_BYTES),
lInMBSize ? “MB” : “kb”,
lineCount);
return sb.toString();

We are seeing similar error in this case for converting long to float..the value of long passed is 2..

Hope long to be convertible to float as they are compatible.

java.util.IllegalFormatConversionException: f != java.lang.Long
at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:399
9)
at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2722)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:2667)
at java.util.Formatter.format(Formatter.java:2433)
at java.util.Formatter.format(Formatter.java:2367)
at com.tejasoft.ant.common.cm.CMInfo.toString(CMInfo.java:99)
at java.lang.String.valueOf(String.java:2826)

By: Tahir

Tahir — Thu, 24 Dec 2009 10:10:01 +0000

Thanks, It is much clear and to the point.
Precise and concise without any unnecessary stuff

By: deval mathur

deval mathur — Mon, 17 Nov 2008 06:46:33 +0000

it was helpful….
i was struck at it at one point….gud

By: Jeff

Jeff — Fri, 13 Jun 2008 00:44:01 +0000

Thanks soooooooooooo much Jarosław for this very helpful help.