An IllegalFormatException of this type is thrown by a Formatter when the format string contains duplicate format flags for the same conversion specifier.

Figure 16-14. java.util.DuplicateFormatFlagsException

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