Answered: FilelO 04: Echo to ArrayList Write a FileIo04 class with a method named readFileToArrayList() that takes a filename (as a String) and returns an ArrayList of...

Database System Concepts

7th Edition

ISBN: 9780078022159

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

Publisher: McGraw-Hill Education

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.

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Transcribed Image Text:## FileIO 04: Echo to ArrayList Create a `FileIO04` class with a method named `readFileToArrayList()` that takes a filename (as a `String`) and returns an `ArrayList` of `Strings`. For each line in the file, add it as a separate element in the `ArrayList`. Do not include the newline at the end of each line. Use a `BufferedReader` object to read the file contents. If an exception is thrown, display an informative message and return an empty `ArrayList`. ### Examples: ```java FileIO04 driver1 = new FileIO04(); driver1.readFileToArrayList("poem.txt"); // returns (an ArrayList of Strings with 3 elements): {"Two roads diverged in a wood and I", "I took the one less traveled by", "And that has made all the difference"} FileIO04 driver2 = new FileIO04(); driver2.readFileToArrayList("bogusFilename.txt"); // returns an empty ArrayList ``` --- ## FileIO 05: Averages from a File Create a `FileIO05` 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 the values. Return the average as a `Double`. If an exception is thrown, display an informative message and return `0.0`. ### Example: ```java FileIO05 driver = new FileIO05(); String filename = "numbers0.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 ```

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