Java In A Nutshell, 5th Edition

An IllegalFormatException of this type is thrown by a Formatter when unknown flags are specified in a format string.

public class UnknownFormatFlagsException extends IllegalFormatException { // Public Constructors public UnknownFormatFlagsException (String f ); // Public Instance Methods public String getFlags ( ); // Public Methods Overriding Throwable public String getMessage ( ); }