I need this now please help me out. ## FileIO 04: Echo to ArrayListCreate 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:```javaFileIO04 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 FileCreate 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:```javaFileIO05 driver = new FileIO05();String filename = "numbers0.txt";Double val = driver.calculateAverage(filename); // returns 58.3529411764706filename = "numbers1.txt";val = driver.calculateAverage(filename); // returns 62.699999999999996filename = "numbers2.txt";val = driver.calculateAverage(filename); // returns 56.828571428571436```

As per our guidelines we are supposed to answer only one question. Kindly repost other questions as a separate question. The readFileToArrayList() method recieves filename as function parameter. Inside the function File and BufferedReader objects are created to read file. readLine() function of BufferedReader is used read file line by line. Each line read is added to the ArrayList. Finally the ArrayList is returned from the function.import java.util.*; import java.io.*; public class FileIO04{ public ArrayList<String> readFileToArrayList(String str) throws Exception { File file = new File(str); //Read a file Object BufferedReader br = new BufferedReader(new FileReader(file)); //Create a BufferedReader Object String line; //To read line from the file. ArrayList<String> list = new ArrayList<String>(); //Declaring an ArrayList while ((line = br.readLine()) != null) { list.add(line); } return list; }}

Engineering

Computer Science

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 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 File1084 driver1 - new File1084(); 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") File1084 driver2- new File1084(); driver2.readFileToArrayList( "bogusFilename.txt" ); // returns an empty ArrayList

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 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 File1084 driver1 - new File1084(); 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") File1084 driver2- new File1084(); driver2.readFileToArrayList( "bogusFilename.txt" ); // returns an empty ArrayList

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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Concept explainers

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.

Question

I need this now please help me out.

## 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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