question: @ Override public Enumeration < Option > listOptions ( ) { Vector < Option > newVector = new Vector < Option > ( 2 ) ; newVector . addElement ( new Option ( "\tSpecify list of columns to delete. First and last are valid\n" + "\tindexes. (default none)" , "R" , 1 , "-R <index1,index2-index4,...>" ) ) ; newVector . addElement ( new Option ( "\tInvert matching sense (i.e. only keep specified columns)" , "V" , 0 , "-V" ) ) ; return newVector . elements ( ) ; }
target:  Returns an enumeration describing the available options.