import java.util.Scanner;public class InstrumentInformation { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); Instrument myInstrument = new Instrument(); StringInstrument myStringInstrument = new StringInstrument(); String instrumentName, manufacturerName, stringInstrumentName, stringManufacturer; int yearBuilt, cost, stringYearBuilt, stringCost, numStrings, numFrets; boolean bowed; instrumentName = scnr.nextLine(); manufacturerName = scnr.nextLine(); yearBuilt = scnr.nextInt(); scnr.nextLine(); cost = scnr.nextInt(); scnr.nextLine(); stringInstrumentName = scnr.nextLine(); stringManufacturer = scnr.nextLine(); stringYearBuilt = scnr.nextInt(); stringCost = scnr.nextInt(); numStrings = scnr.nextInt(); numFrets = scnr.nextInt(); bowed = scnr.nextBoolean(); myInstrument.setName(instrumentName); myInstrument.setManufacturer(manufacturerName); myInstrument.setYearBuilt(yearBuilt); myInstrument.setCost(cost); myInstrument.printInfo(); myStringInstrument.setName(stringInstrumentName); myStringInstrument.setManufacturer(stringManufacturer); myStringInstrument.setYearBuilt(stringYearBuilt); myStringInstrument.setCost(stringCost); myStringInstrument.setNumOfStrings(numStrings); myStringInstrument.setNumOfFrets(numFrets); myStringInstrument.setIsBowed(bowed); myStringInstrument.printInfo(); System.out.println(" Number of strings: " + myStringInstrument.getNumOfStrings()); System.out.println(" Number of frets: " + myStringInstrument.getNumOfFrets()); System.out.println(" Is bowed: " + myStringInstrument.getIsBowed()); }} ```java// TODO: Define a class: StringInstrument that is derived from the Instrument classpublic class Instrument {}public class StringInstrument extends Instrument { // TODO: Declare private fields private { setNumOfStrings(int); setNumOfFrets(int); setIsBowed(bool); } getNumOfStrings(); getNumOfFrets(); getIsBowed(); // TODO: Define mutator methods - // setNumOfStrings(), setNumOfFrets(), setIsBowed() // TODO: Define accessor methods - // getNumOfStrings(), getNumOfFrets(), getIsBowed()}```### ExplanationThis code snippet defines a Java class `StringInstrument` which is derived from a base class `Instrument`. The class structure includes:1. **Class Declaration:** - `StringInstrument extends Instrument`: This indicates that `StringInstrument` is a subclass of `Instrument`, inheriting its properties and behavior.2. **Private Fields:** - Private fields are intended for values such as the number of strings, number of frets, and whether the instrument is bowed. However, the code uses methods to set these values, which is an unusual syntax for declaring variables. These fields should typically be declared with type and variable names.3. **Accessor and Mutator Methods:** - **Mutator (Setter) Methods:** - `setNumOfStrings(int)`: Sets the number of strings. - `setNumOfFrets(int)`: Sets the number of frets. - `setIsBowed(bool)`: Sets whether the instrument is bowed. - **Accessor (Getter) Methods:** - `getNumOfStrings()`: Returns the number of strings. - `getNumOfFrets()`: Returns the number of frets. - `getIsBowed()`: Returns whether the instrument is bowed.4. **TODO Comments:** - These indicate tasks that need to be completed, such as defining mutator and accessor methods.This code serves as a template for further development of a class representing string instruments, highlighting object-oriented programming concepts in Java, such as inheritance and encapsulation. **Educational Resource: Understanding Object-Oriented Programming with Derived Classes**In this example, you will learn how to define a derived class, `StringInstrument`, in an object-oriented programming context. This class will extend the functionality of an existing `Instrument` class by introducing additional attributes and methods.### Class Definition and Attributes1. **Derived Class: `StringInstrument`** * **Attributes:** - `int`: Number of strings - `int`: Number of frets - `boolean`: Whether the instrument is bowed * **Methods:** - Set and get methods for each private field to ensure encapsulation.### Example#### InputThe example input consists of data for different musical instruments, provided in the following format:```DrumsZildjian20152500GuitarGibson20021200619false```- **Drums**: Details include the name, manufacturer, year built, and cost.- **Guitar**: Details include the name, manufacturer, year built, cost, number of strings, number of frets, and whether it is bowed.#### OutputThe program processes the input to produce a structured output, detailing the instrument information:```Instrument Information:Name: DrumsManufacturer: ZildjianYear built: 2015Cost: 2500Instrument Information:Name: GuitarManufacturer: GibsonYear built: 2002Cost: 1200Number of strings: 6Number of frets: 19Is bowed: false```### Explanation- The output displays detailed information for each instrument.- For instruments like the guitar, which fall under `StringInstrument`, additional details such as the number of strings, number of frets, and whether the instrument is bowed are included. This example demonstrates the use of derived classes to extend functionality, showcasing the principles of inheritance and encapsulation in object-oriented programming.

Main Algorithm:Start.To read user input, create a Scanner object with the name scnr.Create an…

import java.util.Scanner; public class InstrumentInformation { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); Instrument myInstrument = new Instrument(); StringInstrument myStringInstrument = new StringInstrument(); String instrumentName, manufacturerName, stringInstrumentName, stringManufacturer; int yearBuilt, cost, stringYearBuilt, stringCost, numStrings, numFrets; boolean bowed; instrumentName = scnr.nextLine(); manufacturerName = scnr.nextLine(); yearBuilt = scnr.nextInt(); scnr.nextLine(); cost = scnr.nextInt(); scnr.nextLine(); stringInstrumentName = scnr.nextLine(); stringManufacturer = scnr.nextLine(); stringYearBuilt = scnr.nextInt(); stringCost = scnr.nextInt(); numStrings = scnr.nextInt(); numFrets = scnr.nextInt(); bowed = scnr.nextBoolean(); myInstrument.setName(instrumentName); myInstrument.setManufacturer(manufacturerName); myInstrument.setYearBuilt(yearBuilt); myInstrument.setCost(cost); myInstrument.printInfo(); myStringInstrument.setName(stringInstrumentName); myStringInstrument.setManufacturer(stringManufacturer); myStringInstrument.setYearBuilt(stringYearBuilt); myStringInstrument.setCost(stringCost); myStringInstrument.setNumOfStrings(numStrings); myStringInstrument.setNumOfFrets(numFrets); myStringInstrument.setIsBowed(bowed); myStringInstrument.printInfo(); System.out.println(" Number of strings: " + myStringInstrument.getNumOfStrings()); System.out.println(" Number of frets: " + myStringInstrument.getNumOfFrets()); System.out.println(" Is bowed: " + myStringInstrument.getIsBowed()); } }

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