FilelO 05: Averages from a FileWrite a FileI005 class with a method named calculateAverage() that takes a filename (as a String). Assume that the file only contains numerical values. Have the method calculate the average of all of the values.Return the average as a Double. If an exception is thrown, display an informative message and return e.0.ExampleFileI005 driverString filenameDouble val= new FileI005 ();"numbers0.txt";driver.calculateAverage ( filename );// returns 58.3529411764706filename = "numbers1.txt";driver.calculateAverage( filename ); // returns 62.699999999999996%3Dval ="numbers2.txt";driver.calculateAverage( filename ); // returns 56.828571428571436filenameval!!

The function calculateAverage() recieves filename as function parameter. Inside the function object of file and Scanner class is created. nextLine() method of Scanner class is used to read numbers from file, line by line, in String format. Sum variable and count variable are declared to calculate sum and number of elements in a file. Finally average is calculated and the value is returned from the function. import java.io.*;import java.io.File;import java.util.Scanner; class FileIO05{ public double calculateAverage(String str) { try { File file = new File(str); Scanner sc = new Scanner(file); double sum = 0.0; int count = 0; //To count number of elements in file. while (sc.hasNextLine()) { String str1 = sc.nextLine(); //Read a number in string format sum += Double.parseDouble(str1); //Convert string to double and then add to sum. count++; } double average = sum/count; return average; } catch (IOException e) { System.out.println("Error! Opening file."); return 0.0; } }}

Engineering

Computer Science

FilelO 05: Averages from a File Write a FileI005 class with a method named calculateAverage() that takes a filename (as a string). Assume that the file only contains numerical values. Have the method calculate the average of all of the values Retun the average as a Double. If an exception is thrown, display an informative message and return e.e. Example: FileI005 driver = new FileI005 (); String filename- "numberse.txt"; Double val = driver.calculateAverage( filename ); // returns 58.3529411764706 filename- "numbers1.txt"; val - driver.calculateAverage( filename ); // returns 62.699999999999996 filename - "numbers2.txt"; val - driver.calculateAverage( filename ); // returns 56.828571428571436

FilelO 05: Averages from a File Write a FileI005 class with a method named calculateAverage() that takes a filename (as a string). Assume that the file only contains numerical values. Have the method calculate the average of all of the values Retun the average as a Double. If an exception is thrown, display an informative message and return e.e. Example: FileI005 driver = new FileI005 (); String filename- "numberse.txt"; Double val = driver.calculateAverage( filename ); // returns 58.3529411764706 filename- "numbers1.txt"; val - driver.calculateAverage( filename ); // returns 62.699999999999996 filename - "numbers2.txt"; val - driver.calculateAverage( filename ); // returns 56.828571428571436

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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