How to use java.String.format in Scala?

Question

I am trying to use a .format method of a string. But if I place %1, %2, etc. in the string, java.util.UnknownFormatConversionException is thrown pointing to a confusing Java source code piece:

private void checkText(String s) {      int idx;      // If there are any '%' in the given string, we got a bad format     // specifier.     if ((idx = s.indexOf('%')) != -1) {         char c = (idx > s.length() - 2 ? '%' : s.charAt(idx + 1));         throw new UnknownFormatConversionException(String.valueOf(c));     } } 

From this I understand that % char is forbidden. If so, then what should I use for argument placeholders?

I use Scala 2.8.

Answer 1

While all the previous responses are correct, they're all in Java. Here's a Scala example:

val placeholder = "Hello %s, isn't %s cool?" val formatted = placeholder.format("Ivan", "Scala") 

I also have a blog post about making format like Python's % operator that might be useful.