In the CarListB.java file, we use the variable carList on lines 8, 16, 17 and 18. But, that variable is not defined in the CarListB class. Explain how this code is able to work ```javapublic class CarListB extends CarListA { public CarListB() { super(); } public String toXML() { String temp = "\n"; temp += "\n"; for (Car car : carList) { temp += car.toXML() + "\n"; } temp += ""; return temp; } public String toJSON() { String temp = "{\n \"cars\" : [\n"; for (int i = 0; i < carList.size(); i++) { temp += carList.get(i).toJSON(); if (i < carList.size() - 1) { temp += ","; } temp += "\n"; } temp += " ]\n}"; return temp; }}```### ExplanationThis code defines a Java class named `CarListB` that extends another class called `CarListA`. The class is responsible for producing string representations of a list of cars in XML and JSON formats. Below is a detailed explanation of significant sections:1. **Class Definition**: - `public class CarListB extends CarListA` denotes that `CarListB` is a subclass of `CarListA`.2. **Constructor**: - `public CarListB()` calls the constructor of the superclass `CarListA` using `super()`.3. **XML Conversion** (`toXML` method): - This method generates an XML string representation of the list of cars. - It begins by adding the XML version declaration and opening `` tag. - It iterates over each `Car` object in `carList`, appending each car's XML representation. - Closes with the `` tag and returns the complete XML string.4. **JSON Conversion** (`toJSON` method): - This method generates a JSON string representation of the list of cars. - Starts with the opening brace and a key `"cars"` whose value is a JSON array. - Iterates over each car, appending each car’s JSON representation. - Adds a comma between cars, except for the last one, ensuring valid JSON format. - Closes the JSON array and object, returning the complete JSON string.These methods provide a convenient way to

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Answered: In the CarListB.java file, we use the…

In the CarListB.java file, we use the variable carList on lines 8, 16, 17 and 18. But, that variable is not defined in the CarListB class. Explain how this code is able to work

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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