set the message handler instance that is used by the static methods in this class . if the given handler is null , then do nothing . concode_field_sep MessageHandler _handler concode_field_sep MessageHandler getMessageHandler concode_elem_sep void _message concode_elem_sep boolean yesNoQuestion concode_elem_sep void _error concode_elem_sep void _error concode_elem_sep void _warning concode_elem_sep void _warning concode_elem_sep boolean _yesNoQuestion concode_elem_sep void warning concode_elem_sep void warning concode_elem_sep String shortDescription concode_elem_sep void error concode_elem_sep void error concode_elem_sep void message concode_elem_sep boolean _yesNoCancelQuestion concode_elem_sep boolean yesNoCancelQuestion
void function ( MessageHandler arg0 ) { if ( arg0 != null ) { _handler = arg0 ; } }