An IllegalFormatException of this type is thrown by a Formatter when the type of the format( ) or printf( ) argument does not match the type required by the corresponding conversion specifier in the format string.

Figure 16-29. java.util.IllegalFormatConversionException

public class IllegalFormatConversionException extends IllegalFormatException {
// Public Constructors
     public IllegalFormatConversionException(char c, Class<?> arg);  
// Public Instance Methods
     public Class<?> getArgumentClass( );  
     public char getConversion( );  
// Public Methods Overriding Throwable
     public String getMessage( );  
}