question: @ Override public Enumeration < Option > listOptions ( ) { Vector < Option > result = new Vector < Option > ( 3 ) ; result . addElement ( new Option ( "\tThe minimum frequency for a value to remain (default: 2).\n" , "-N" , 1 , "-N <int>" ) ) ; result . addElement ( new Option ( "\tSets list of attributes to act on (or its inverse). 'first and 'last' are accepted as well.'\n" + "\tE.g.: first-5,7,9,20-last\n" + "\t(default: 1,2)" , "R" , 1 , "-R <range>" ) ) ; result . addElement ( new Option ( "\tInvert matching sense (i.e. act on all attributes not specified in list)" , "V" , 0 , "-V" ) ) ; result . addAll ( Collections . list ( super . listOptions ( ) ) ) ; return result . elements ( ) ; }
target:  Returns an enumeration describing the available options.