Java Question

I only put all line into the set, but have trouble with the output part.

1. [5 marks] Read the input one line at a time until you have read all n lines and imagine these lines are numbered ., Next output lines floor(n/2 . -1 followed by lines 0, floor(n 2)-1 Your code goes here - see Parte for an example @param r the reader to read from @param w the writer to write to @throws IOException o: public static void doIt(BufferedReader r, Printwriter w) throws IOException 7 Your code goes here -see Parte for an example Set mySet-new HashSet (); for(String line -r.readLine() line nul1; line -r.readLine)) mySet.add(line)