IllegalFormatException

AI-generated Key Takeaways

• IllegalFormatException signals an illegal syntax in a format string or incompatibility between the format specifier and arguments.

• It's an unchecked exception extending IllegalArgumentException and should be instantiated through its explicit subtypes for specific errors.

• The exception provides methods for retrieving the error message, stack trace, and other related information inherited from its superclasses.

• Various direct subclasses, like DuplicateFormatFlagsException and IllegalFormatConversionException, address specific formatting issues.

public class IllegalFormatException extends IllegalArgumentException

Known Direct Subclasses DuplicateFormatFlagsException, FormatFlagsConversionMismatchException, IllegalFormatCodePointException, IllegalFormatConversionException, IllegalFormatFlagsException, IllegalFormatPrecisionException, IllegalFormatWidthException, MissingFormatArgumentException, MissingFormatWidthException, UnknownFormatConversionException, UnknownFormatFlagsException DuplicateFormatFlagsException Unchecked exception thrown when duplicate flags are provided in the format specifier.  FormatFlagsConversionMismatchException Unchecked exception thrown when a conversion and flag are incompatible.  IllegalFormatCodePointException Unchecked exception thrown when a character with an invalid Unicode code point as defined by Character.isValidCodePoint(int) is passed to the Formatter.  IllegalFormatConversionException Unchecked exception thrown when the argument corresponding to the format specifier is of an incompatible type.  IllegalFormatFlagsException Unchecked exception thrown when an illegal combination flags is given.  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.  IllegalFormatWidthException Unchecked exception thrown when the format width is a negative value other than -1 or is otherwise unsupported.  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.  MissingFormatWidthException Unchecked exception thrown when the format width is required.  UnknownFormatConversionException Unchecked exception thrown when an unknown conversion is given.  UnknownFormatFlagsException Unchecked exception thrown when an unknown flag is given.

Unchecked exception thrown when a format string contains an illegal syntax or a format specifier that is incompatible with the given arguments. Only explicit subtypes of this exception which correspond to specific errors should be instantiated.

Inherited Method Summary

From class java.lang.Throwable

synchronized final void	addSuppressed(Throwable exception) Appends the specified exception to the exceptions that were suppressed in order to deliver this exception.
synchronized Throwable	fillInStackTrace() Fills in the execution stack trace.
synchronized Throwable	getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown.
String	getLocalizedMessage() Creates a localized description of this throwable.
String	getMessage() Returns the detail message string of this throwable.
StackTraceElement[]	getStackTrace() Provides programmatic access to the stack trace information printed by printStackTrace().
synchronized final Throwable[]	getSuppressed() Returns an array containing all of the exceptions that were suppressed, typically by the try-with-resources statement, in order to deliver this exception.
synchronized Throwable	initCause(Throwable cause) Initializes the cause of this throwable to the specified value.
void	printStackTrace() Prints this throwable and its backtrace to the standard error stream.
void	printStackTrace(PrintWriter s) Prints this throwable and its backtrace to the specified print writer.
void	printStackTrace(PrintStream s) Prints this throwable and its backtrace to the specified print stream.
void	setStackTrace(StackTraceElement[] stackTrace) Sets the stack trace elements that will be returned by getStackTrace() and printed by printStackTrace() and related methods.
String	toString() Returns a short description of this throwable.

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.