DuplicateFormatFlagsException

public class DuplicateFormatFlagsException
extends IllegalFormatException

Unchecked exception thrown when duplicate flags are provided in the format specifier.

Unless otherwise specified, passing a null argument to any method or constructor in this class will cause a NullPointerException to be thrown.

Summary

Public constructors
`DuplicateFormatFlagsException(String f)` Constructs an instance of this class with the specified flags.

Public methods
`String`	`getFlags()` Returns the set of flags which contains a duplicate flag.
`String`	`getMessage()` Returns the detail message string of this throwable.

Inherited methods

From class


        
          java.lang.Throwable

`final void`	`addSuppressed(Throwable exception)` Appends the specified exception to the exceptions that were suppressed in order to deliver this exception.
`Throwable`	`fillInStackTrace()` Fills in the execution stack trace.
`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()`.
`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.
`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)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

DuplicateFormatFlagsException

Added in API level 1

public DuplicateFormatFlagsException (String f)

Constructs an instance of this class with the specified flags.

Parameters
`f`	`String`: The set of format flags which contain a duplicate flag.

Public methods

getFlags

Added in API level 1

public String getFlags ()

Returns the set of flags which contains a duplicate flag.

Returns
`String`	The flags

getMessage

Added in API level 1

public String getMessage ()

Returns the detail message string of this throwable.

Returns
`String`	the detail message string of this `Throwable` instance (which may be `null`).

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2026-08-03 UTC.

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java.lang.Object
↳	java.lang.Throwable
	↳	java.lang.Exception
		↳	java.lang.RuntimeException
			↳	java.lang.IllegalArgumentException
				↳	java.util.IllegalFormatException
					↳	java.util.DuplicateFormatFlagsException

Sunbelt Computer Software

PL/B Language Development and Support

DuplicateFormatFlagsException

Summary

Public constructors

Public methods

Inherited methods

Public constructors

DuplicateFormatFlagsException

Public methods

getFlags

getMessage