[java] Java: Literal percent sign in printf statement

I'm trying to add an actual percent sign into a printf statement in Java and I'm getting the error:

lab1.java:166: illegal escape character
                System.out.printf("%s\t%s\t%1.2f\%\t%1.2f\%\n",ID,pattern,support,confidence);
                                                 ^
lab1.java:166: illegal escape character
                System.out.printf("%s\t%s\t%1.2f\%\t%1.2f\%\n",ID,pattern,support,confidence);
                                                          ^
2 errors

I can't figure out how to put an actual percent sign into my printf? I thought using \% to escape it would work, but it isn't.

Any ideas?

Escaped percent sign is double percent (%%):

System.out.printf("2 out of 10 is %d%%", 20);

You can use StringEscapeUtils from Apache Commons Logging utility or escape manually using code for each character.