# Uses of Class
java.util.IllegalFormatException

Packages that use IllegalFormatException
Package
Description
java.util
Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.

- ## Uses of IllegalFormatException in java.util

  Subclasses of IllegalFormatException in java.util
  Modifier and Type
  Class
  Description
  `class`
  `DuplicateFormatFlagsException`
  Unchecked exception thrown when duplicate flags are provided in the format specifier.
  `class`
  `FormatFlagsConversionMismatchException`
  Unchecked exception thrown when a conversion and flag are incompatible.
  `class`
  `IllegalFormatCodePointException`
  Unchecked exception thrown when a character with an invalid Unicode code point as defined by `Character.isValidCodePoint(int)` is passed to the `Formatter`.
  `class`
  `IllegalFormatConversionException`
  Unchecked exception thrown when the argument corresponding to the format specifier is of an incompatible type.
  `class`
  `IllegalFormatFlagsException`
  Unchecked exception thrown when an illegal combination flags is given.
  `class`
  `IllegalFormatPrecisionException`
  Unchecked exception thrown when the precision is a negative value other than `-1`, the conversion does not support a precision, or the value is otherwise unsupported.
  `class`
  `IllegalFormatWidthException`
  Unchecked exception thrown when the format width is a negative value other than `-1` or is otherwise unsupported.
  `class`
  `MissingFormatArgumentException`
  Unchecked exception thrown when there is a format specifier which does not have a corresponding argument or if an argument index refers to an argument that does not exist.
  `class`
  `MissingFormatWidthException`
  Unchecked exception thrown when the format width is required.
  `class`
  `UnknownFormatConversionException`
  Unchecked exception thrown when an unknown conversion is given.
  `class`
  `UnknownFormatFlagsException`
  Unchecked exception thrown when an unknown flag is given.