\"The Java Project contains three class files; MergeSort.java, Sort.java, and So

Question

"The Java Project contains three class files; MergeSort.java, Sort.java, and SortTest.java. Double-click on each file in the Project section (at the left of the NetBeans IDE window) to display the file’s contents. Each of the Java class files contain comments explaining the purpose of the class and the purpose of the class’s methods. The file that we need to add threads to is Sort.java, below: import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; public class Sort { /** * You are to implement this method. The method should invoke one or * more threads to read and sort the data from the collection of Files. * The method should return a sorted list of all of the String data * contained in the files. * * @param files * @return * @throws IOException */ public static String[] threadedSort(File[] files) throws IOException { throw new java.lang.IllegalStateException("Method not implemented"); } /** * Given an array of files, this method will return a sorted * list of the String data contained in each of the files. * * @param files the files to be read * @return the sorted data * @throws IOException thrown if any errors occur reading the file */ public static String[] sort(File[] files) throws IOException { String[] sortedData = new String[0]; for (File file : files) { String[] data = getData(file); data = MergeSort.mergeSort(data); sortedData = MergeSort.merge(sortedData, data); } return sortedData; } /** * This method will read in the string data from the specified * file and return the data as an array of String objects. * * @param file the file containing the String data * @return String array containing the String data * @throws IOException thrown if any errors occur reading the file */ private static String[] getData(File file) throws IOException { ArrayList data = new ArrayList(); BufferedReader in = new BufferedReader(new FileReader(file)); // Read the data from the file until the end of file is reached while (true) { String line = in.readLine(); if (line == null) { // the end of file was reached break; } else { data.add(line); } } //Close the input stream and return the data in.close(); return data.toArray(new String[0]); } }

Explanation / Answer

import java.util.Scanner; /* Class MergeSort */ public class MergeSort { /* Merge Sort function */ public static void sort(int[] a, int low, int high) { int N = high - low; if (N

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