Package com.sun.jna

## Interface Callback

- All Known Subinterfaces:
    `CallbackProxy`, `Carbon.EventHandlerProcPtr`, `Ddeml.DdeCallback`, `DispatchVTable.AddRefCallback`, `DispatchVTable.GetIDsOfNamesCallback`, `DispatchVTable.GetTypeInfoCallback`, `DispatchVTable.GetTypeInfoCountCallback`, `DispatchVTable.InvokeCallback`, `DispatchVTable.QueryInterfaceCallback`, `DispatchVTable.ReleaseCallback`, `DLLCallback`, `StdCallLibrary.StdCallCallback`, `UnknownVTable.AddRefCallback`, `UnknownVTable.QueryInterfaceCallback`, `UnknownVTable.ReleaseCallback`, `WinBase.EnumResNameProc`, `WinBase.EnumResTypeProc`, `WinBase.FE_EXPORT_FUNC`, `WinBase.FE_IMPORT_FUNC`, `WinBase.THREAD_START_ROUTINE`, `WinCrypt.CryptGetSignerCertificateCallback`, `WinNT.OVERLAPPED_COMPLETION_ROUTINE`, `WinRas.RasDialFunc2`, `Winsvc.Handler`, `Winsvc.HandlerEx`, `Winsvc.SERVICE_MAIN_FUNCTION`, `WinUser.HOOKPROC`, `WinUser.LowLevelKeyboardProc`, `WinUser.LowLevelMouseProc`, `WinUser.MONITORENUMPROC`, `WinUser.WindowProc`, `WinUser.WinEventProc`, `WinUser.WNDENUMPROC`, `X11.XErrorHandler`
  All Known Implementing Classes:
    `DdemlUtil.DdeAdapter`

      public interface Callback

  All callback definitions must derive from this interface. Any derived interfaces must define a single public method (which may not be named "hashCode", "equals", or "toString"), or one public method named "callback". You are responsible for deregistering your callback (if necessary) in its `Object.finalize()` method. If native code attempts to call a callback which has been GC'd, you will likely crash the VM. If there is no method to deregister the callback (e.g. `atexit` in the C library), you must ensure that you always keep a live reference to the callback object.

  A callback should generally never throw an exception, since it doesn't necessarily have an encompassing Java environment to catch it. Any exceptions thrown will be passed to the default callback exception handler.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface | Description
    --- | --- | ---
    `static interface` | `Callback.UncaughtExceptionHandler` |

  - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static java.util.List<java.lang.String>` | `FORBIDDEN_NAMES` | These method names may not be used for a callback method.
    `static java.lang.String` | `METHOD_NAME` | You must use this method name if your callback interface has multiple public methods.

- - ### Field Detail

    - #### METHOD_NAME

          static final java.lang.String METHOD_NAME

      You must use this method name if your callback interface has multiple public methods. Typically a callback will have only one such method, in which case any method name may be used, with the exception of those in `FORBIDDEN_NAMES`.
      See Also:
        Constant Field Values

    - #### FORBIDDEN_NAMES

          static final java.util.List<java.lang.String> FORBIDDEN_NAMES

      These method names may not be used for a callback method.