question: @ Override public Enumeration < Option > listOptions ( ) { Vector < Option > newVector = new Vector < Option > ( 1 ) ; newVector . addElement ( new Option ( "\tWhether to use K2 prior.\n" , "k2" , 0 , "-k2" ) ) ; newVector . addAll ( Collections . list ( super . listOptions ( ) ) ) ; return newVector . elements ( ) ; }
target:  Returns an enumeration describing the available options