Improve the performance of the Java program by adding threads to the file. Implement the threadedSort() method within the Sort class. (Reuse any of the existing methods by calling them as necessary from your threadedSort method. You may add additional methods to the Sort class, if necessary.)Document your analysis as a short paper (1 page).Main File (;002import;003import;004import;005import java.util.ArrayList;006import java.util.logging.Level;007import java.util.logging.Logger;008 009public class Sort {010 011  /**012   * You are to implement this method. The method should invoke one or013   * more threads to read and sort the data from the collection of Files.014   * The method should return a sorted list of all of the String data015   * contained in the files.016   *017   * @param files018   * @return019   * @throws IOException020   */021  public static String[] threadedSort(File[] files) throws IOException022  {023      String[] sortedData = new String[0];024      SortThread[] sortThreads = new SortThread[files.length];025      for (int i=0; i026          sortThreads[i] = new SortThread(files[i]);027          sortThreads[i].start();028      }029       030      for (SortThread thread : sortThreads) {031          try {032              thread.join();033          }034          catch (InterruptedException ex){035              Logger.getLogger(Sort.class.getName()).log(Level.SEVERE, null, ex);036          }037          return sortedData;038      }039      throw new java.lang.IllegalStateException(“Method not implemented”);040  }041   042  private static class SortThread extends Thread {043      private File file;044      private String[] data;045 046       047      public SortThread(File file) {048          this.file = file;049      }050       051      @Override052      public void run() {053          try {054              data = Sort.getData(file);055              for (int i = 0; i056                  //Thread.sleep(100);               057                 //I commented this out because it was wasting time058                  //System.out.println(data[i]);059                  //I commented this out because I didn’t want to display the entire files060              }061          }062          catch (IOException ex) {063              Logger.getLogger (Sort.class.getName()).log(Level.SEVERE, null, ex);064          }065    }066  }067   068  /**069   * Given an array of files, this method will return a sorted070   * list of the String data contained in each of the files.071   *072   * @param files the files to be read073   * @return the sorted data074   * @throws IOException thrown if any errors occur reading the file075   */076  public static String[] sort(File[] files) throws IOException {077 078    String[] sortedData = new String[0];079 080    for (File file : files) {081      String[] data = getData(file);082      data = MergeSort.mergeSort(data);083      sortedData = MergeSort.merge(sortedData, data);084    }085 086    return sortedData;087 088  }089  /**090   * This method will read in the string data from the specified091   * file and return the data as an array of String objects.092   *093   * @param file the file containing the String data094   * @return String array containing the String data095   * @throws IOException thrown if any errors occur reading the file096   */097  private static String[] getData(File file) throws IOException {098 099    ArrayList data = new ArrayList();100    BufferedReader in = new BufferedReader(new FileReader(file));101    // Read the data from the file until the end of file is reached102    while (true) {103      String line = in.readLine();104      if (line == null) {105        // the end of file was reached106        break;107      }108      else {109        data.add(line);110      }111    }112    //Close the input stream and return the data113    in.close();114    return data.toArray(new String[0]);115 116  }117} class MergeSort {02   03  // The mergeSort method returns a sorted copy of the04  // String objects contained in the String array data.05  /**06   * Sorts the String objects using the merge sort algorithm.07   *08   * @param data the String objects to be sorted09   * @return the String objects sorted in ascending order10   */11  public static String[] mergeSort(String[] data) {12 13    if (data.length > 1) {14      String[] left = new String[data.length / 2];15      String[] right = new String[data.length – left.length];16      System.arraycopy(data, 0, left, 0, left.length);17      System.arraycopy(data, left.length, right, 0, right.length);18     19      left = mergeSort(left);20      right = mergeSort(right);21     22      return merge(left, right);23       24    }25    else {26      return data;27    }28     29  }30   31  /**32   * The merge method accepts two String arrays that are assumed33   * to be sorted in ascending order. The method will return a34   * sorted array of String objects containing all String objects35   * from the two input collections.36   *37   * @param left a sorted collection of String objects38   * @param right a sorted collection of String objects39   * @return a sorted collection of String objects40   */41  public static String[] merge(String[] left, String[] right) {42     43    String[] data = new String[left.length + right.length];44     45    int lIndex = 0;46    int rIndex = 0;47     48    for (int i=0; i49      if (lIndex == left.length) {50        data[i] = right[rIndex];51        rIndex++;52      }53      else if (rIndex == right.length) {54        data[i] = left[lIndex];55        lIndex++;56      }57      else if (left[lIndex].compareTo(right[rIndex]) < 0) {58        data[i] = left[lIndex];59        lIndex++;60      }61      else {62        data[i] = right[rIndex];63        rIndex++;64      }65    }66     67    return data;68     69  }70   71};02import;03 04/**05 * The class SortTest is used to test the threaded and non-threaded06 * sort methods. This program will call each method to sort the data07 * contained in the four test files. This program will then test the08 * results to ensure that the results are sorted in ascending order.09 *10 * Simply run this program to verify that you have correctly implemented11 * the threaded sort method. The program will not verify if your sort12 * uses threads, but will verify if your implementation correctly13 * sorted the data contained in the four files.14 *15 * There should be no reason to make modifications to this class.16 */17public class SortTest {18   19  public static void main(String[] args) throws IOException {20     21    File[] files = {new File("enable1.txt"), new File("enable2k.txt"), newFile("lower.txt"), new File("mixed.txt")};22 23    // Run Sort.sort on the files24    long startTime = System.nanoTime();25    String[] sortedData = Sort.sort(files);26    long stopTime = System.nanoTime();27    double elapsedTime = (stopTime - startTime) / 1000000000.0;28     29    // Test to ensure the data is sorted30    for (int i=0; i31      if (sortedData[i].compareTo(sortedData[i+1]) > 0) {32        System.out.println(“The data returned by Sort.sort is not sorted.”);33        throw new java.lang.IllegalStateException(“The data returned by Sort.sort is not sorted”);34      }35    }36    System.out.println(“The data returned by Sort.sort is sorted.”);37    System.out.println(“Sort.sort took ” + elapsedTime + ” seconds to read and sort the data.”);38     39    // Run Sort.threadedSort on the files and test to ensure the data is sorted40    startTime = System.nanoTime();41    String[] threadSortedData = Sort.threadedSort(files);42    stopTime = System.nanoTime();43    double threadedElapsedTime = (stopTime – startTime)/ 1000000000.0;44     45    // Test to ensure the data is sorted46    if (sortedData.length != threadSortedData.length) {47      System.out.println(“The data return by Sort.threadedSort is missing data”);48      throw new java.lang.IllegalStateException(“The data returned by Sort.threadedSort is not sorted”);49    }50    for (int i=0; i51      if (threadSortedData[i].compareTo(threadSortedData[i+1]) > 0) {52        System.out.println(“The data return by Sort.threadedSort is not sorted”);53        throw new java.lang.IllegalStateException(“The data returned by Sort.threadedSort is not sorted”);54      }55    }56    System.out.println(“The data returned by Sort.threadedSort is sorted.”);57    System.out.println(“Sort.threadedSort took ” + threadedElapsedTime + ” seconds to read and sort the data.”);58     59     60  }61   62}The error am getting:run:The data returned by Sort.sort is sorted.Sort.sort took 2.072120353 seconds to read and sort the data.The data return by Sort.threadedSort is missing dataException in thread “main” java.lang.IllegalStateException: The data returned by Sort.threadedSort is not sortedat SortTest.main( Result: 1BUILD SUCCESSFUL (total time: 3 seconds)

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