question: @ Override public Enumeration < Option > listOptions ( ) { Vector < Option > result = new Vector < Option > ( ) ; result . addElement ( new Option ( "\tSets the attribute index\n" + "\t(default last)." , "C" , 1 , "-C <col>" ) ) ; result . addElement ( new Option ( "\tComma-separated list of labels to add.\n" + "\t(default: none)" , "L" , 1 , "-L <label1,label2,...>" ) ) ; result . addElement ( new Option ( "\tTurns on the sorting of the labels." , "S" , 0 , "-S" ) ) ; return result . elements ( ) ; }
target:  Returns an enumeration describing the available options.