Java printf fails : UnknownFormatConversionException

Question

I am trying understand why one of my printf statements fail. #1 below is fine, but #2 fails with the exception at the end. What's causing this?

0       String LOCATION = "http://www.mywebsite.web/";
1       System.out.printf(" <img src=\"%sIMAGE.gif\">", LOCATION);   
2       System.out.printf(" <img src=\"%sIMAGE.gif\" width=\"25%\" height=\"25%\" border=0>", LOCATION);

Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '"'
    at java.util.Formatter.checkText(Formatter.java:2519)
    at java.util.Formatter.parse(Formatter.java:2501)
    at java.util.Formatter.format(Formatter.java:2430)
    at java.io.PrintStream.format(PrintStream.java:937)
    at java.io.PrintStream.printf(PrintStream.java:838)
    at MyCode.main(MyCode.java:292)

Any ideas what's causing this?

Escape character for % sign is % stackoverflow.com/questions/1708444/… — SEU
– SEU, Commented Aug 12, 2012 at 6:34

Harmeet Singh · Accepted Answer · 2012-08-12 06:44:19Z

3

Here you go

String LOCATION = "http://www.mywebsite.web/";
System.out.printf(" <img src='%sIMAGE.gif'>", LOCATION);   
System.out.printf(" <img src='%sIMAGE.gif' width='25%%' height='25%%' border=0>", LOCATION);

I have replaced " with ' ( looks simplified ) will work like charm as in html " or ' do great.
For % , it should be %% as % is escaped with %

edited Aug 12, 2012 at 6:44

answered Aug 12, 2012 at 6:30

Harmeet Singh

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Costis Aivalis · Accepted Answer · 2012-08-12 06:37:19Z

2

The problem is with the percent sign. Since % is used as a format string. You can insert % as a literal preceding it with another percent... %%

System.out.printf(" <img src=\"%sIMAGE.gif\" width=\"25%%\" height=\"25%%\" border=0>", LOCATION);

answered Aug 12, 2012 at 6:37

Costis Aivalis

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Comments

Marco Leogrande · Accepted Answer · 2012-08-12 06:57:43Z

1

The exception says that %" is not a valid format specifier. You should escape your % sign in line 2:

System.out.printf(" <img src=\"%sIMAGE.gif\" width=\"25%%\" height=\"25%%\" border=0>", LOCATION);

edited Aug 12, 2012 at 6:57

answered Aug 12, 2012 at 6:16

Marco Leogrande

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Edwin Buck · Accepted Answer · 2012-08-12 06:16:16Z

0

%\"

Is not a valid printf field.

answered Aug 12, 2012 at 6:16

Edwin Buck

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