question: @ Override public Enumeration < Option > listOptions ( ) { Vector < Option > newVector = new Vector < Option > ( 1 ) ; newVector . addElement ( new Option ( "\tSpecify list of columns to take the differences between.\n" + "\tFirst and last are valid indexes.\n" + "\t(default none)" , "R" , 1 , "-R <index1,index2-index4,...>" ) ) ; return newVector . elements ( ) ; }
target:  Returns an enumeration describing the available options.