Please answer question correctly and show the result of the working code. The actual and demo...

Abc

package abc2;  import java.io.BufferedReader; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set;  public class Part0 {     /**      * Read lines one at a time from r.  After reading all lines, output      * all lines to w, outputting duplicate lines only once.  Note: the order      * of the output is unspecified and may have nothing to do with the order      * that lines appear in r.      * @param r the reader to read from      * @param w the writer to write to      * @throws IOException      */     public static void doIt(BufferedReader r, PrintWriter w) throws IOException {         Set<String> s = new HashSet<String>();         Set<String> duplicates = new HashSet<String>();          for (String line = r.readLine(); line != null; line = r.readLine()) {             if(s.contains(line)){                 duplicates.add(line);             }else{                 s.add(line);             }         }          for (String duplicate : duplicates) {             w.println(" These are the duplicates that are to be printed only once:: " + duplicate);         }          for (String text : s) {             w.println(text);         }     } } 

package abc2;  import java.io.*; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set;  public class Part5 {     /**      * Your code goes here - see Part0 for an example      * @param r the reader to read from      * @param w the writer to write to      * @throws IOException      */     public static void doIt(BufferedReader r, PrintWriter w) throws IOException {         // Your code goes here - see Part0 for an example         Set<String> s = new HashSet<String>();         Set<String> duplicates = new HashSet<String>();          for (String line = r.readLine(); line != null; line = r.readLine()) {             /*             Since the duplicate lines has to be printed only ones we have created another Set collection             for this.              */             if(s.contains(line)){                 duplicates.add(line);             }else{                 s.add(line);             }         }          for (String duplicate : duplicates) {             w.println(" These are the duplicates lines that are to be printed only once :: " + duplicate);         }          for (String text : s) {             w.println(text);         }     }      /**      * The driver.
 Open a BufferedReader and a PrintWriter, either from System.in      * and System.out or from filenames specified on the command line, then call doIt.      * @param args      */     public static void main(String[] args) {         try {             BufferedReader r;             PrintWriter w;             if (args.length == 0) {                 r = new BufferedReader(new InputStreamReader(System.in));                 w = new PrintWriter(System.out);             } else if (args.length == 1) {                 r = new BufferedReader(new FileReader(args[0]));                 w = new PrintWriter(System.out);             } else {                 r = new BufferedReader(new FileReader(args[0]));                 w = new PrintWriter(new FileWriter(args[1]));             }             long start = System.nanoTime();             doIt(r, w);             w.flush();             long stop = System.nanoTime();             System.out.println("Execution time: " + 10e-9 * (stop-start));         } catch (IOException e) {             System.err.println(e);             System.exit(-1);         }     } }