--import statemnts for Random- Scanner and IO import java-util-Random-.pdf

//import statemnts for Random, Scanner and IO import java.util.Random; import java.util.Scanner; import java.io.*; public class Hobbits { public static void main(String[] args) throws IOException { final int NUM_HOBBITS = 5; final int NUM_COLUMNS = 2; String fileName = "hobbits.csv"; //call populateHobbits( ) to create the two dimensional array double[][] hobbits = populateHobbits(NUM_HOBBITS, NUM_COLUMNS); //display the number of hobbits System.out.println(hobbits.length + " hobbits accepted Gandalf's invitation to lunch\n"); //calculate the means of the columns double[] hobbitMeans = getColMeans(hobbits); //write hobbits array to file writeHobbits(hobbits, fileName); //read and display the file that has been read readHobbitses(fileName); //call displayColMeans to display hobbit means displayColMeans(hobbitMeans); } //method to populate hobbits array with random double values public static double[][] populateHobbits(int numHobbits, int numCols) { final double HT_MULTIPLIER = 10.0; //multiplier for the hobbit height final double WT_MULTIPLIER = 250.0; //multiplier for the hobbit weight //instantiate Random object Random rand = new Random(); //declare two dim array with numHobbits rows numCols columns double[][] hobbitArray = new double[numHobbits][numCols]; //assign random double values to all elements for (int i = 0; i < numHobbits; i++) //outer loop is for rows { for (int j = 0; j < numCols; j++) //inner loop is for columns { //get a random double value in range [0.2, 0.4] double randDouble = getRandDouble(rand); //assign this double to the current array element hobbitArray[i][j] = randDouble; //determine which multiplier to use if (j == 0) //this is column for height hobbitArray[i][j] *= HI_MULTIPLIER; else //this is column for weight hobbitArray[i][j] *= WT_MULTIPLIER; } } return hobbitArray; //return the two dimensional array } //method to write hobbits array to file public static void writeHobbits(double[][] ar, String fileName) throws IOException { //open the file to write PrintWriter outFile = new PrintWriter(fileName); //print columen heading of the array of stats outFile.println("HEIGHT,WEIGHT"); for (int i = 0; i < ar.length; i++) { for (int j = 0; j < ar[i].length; j++) { outFile.print(ar[i][j]); //if at end of a row, add newline char if (j == ar[i].length - 1) outFile.print("\n"); else //add the "," delimiter outFile.print(","); } //end of inner loop } //end of outer loop outFile.close(); //close outfile System.out.println("The file was successfully written\n"); } //end of method //method to read the hobbits file public static void readHobbitses(String fileName) throws IOException { //open the file to read File dataFile = new File(fileName); Scanner inFile = new Scanner(dataFile); //variable to contain the substrings of one line of file String[] oneLine = new String[2]; int counter = 0; //keep track of line numbers System.out.println("Data read from the " + fileName + " file:"); //read file, one line at a time while (inFile.hasNe.