An IllegalFormatException of this type is thrown by a Formatter when a format conversion requires a field width, but the width is omitted.

Figure 16-44. java.util.MissingFormatWidthException

public class MissingFormatWidthException extends IllegalFormatException {
// Public Constructors
     public MissingFormatWidthException(String s);  
// Public Instance Methods
     public String getFormatSpecifier( );  
// Public Methods Overriding Throwable
     public String getMessage( );  
}