StringInstrument.java // TODO: Define a class: StringInstrument that is derived from the Instrument class public class StringInstrument extends Instrument { // TODO: Declare private fields: numStrings, numFrets // TODO: Define mutator methods - // setNumOfStrings(), setNumOfFrets() // TODO: Define accessor methods - // getNumOfStrings(), getNumOfFrets() }

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
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Instrument.java

public class Instrument {

protectedStringinstrumentName;
protectedStringinstrumentManufacturer;
protectedintyearBuilt, cost;

publicvoidsetName(StringuserName) {
instrumentName = userName;
}

publicStringgetName() {
return instrumentName;
}

publicvoidsetManufacturer(StringuserManufacturer) {
instrumentManufacturer = userManufacturer;
}

publicStringgetManufacturer(){
return instrumentManufacturer;
}

publicvoidsetYearBuilt(intuserYearBuilt) {
yearBuilt = userYearBuilt;
}

publicintgetYearBuilt() {
return yearBuilt;
}

publicvoidsetCost(intuserCost) {
cost = userCost;
}

publicintgetCost() {
return cost;
}

publicvoidprintInfo() {
System.out.println("Instrument Information: ");
System.out.println(" Name: " + instrumentName);
System.out.println(" Manufacturer: " + instrumentManufacturer);
System.out.println(" Year built: " + yearBuilt);
System.out.println(" Cost: " + cost);
}

}
 
StringInstrument.java
// TODO: Define a class: StringInstrument that is derived from the Instrument class
public class StringInstrument extends Instrument {
// TODO: Declare private fields: numStrings, numFrets

// TODO: Define mutator methods -
// setNumOfStrings(), setNumOfFrets()

// TODO: Define accessor methods -
// getNumOfStrings(), getNumOfFrets()

}


InstrumentInformation.java
 
import java.util.Scanner;

public class InstrumentInformation {
publicstaticvoidmain(String[] args) {
Scannerscnr = newScanner(System.in);

InstrumentmyInstrument = newInstrument();
StringInstrumentmyStringInstrument = newStringInstrument();

StringinstrumentName, manufacturerName, stringInstrumentName, stringManufacturer;
intyearBuilt, cost, stringYearBuilt, stringCost, numStrings, numFrets;

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();

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.printInfo();

System.out.println(" Number of strings: " + myStringInstrument.getNumOfStrings());
System.out.println(" Number of frets: " + myStringInstrument.getNumOfFrets());
}
}
 
 
Given main() and the Instrument class, define a derived class, StringInstrument, for string instruments.
Ex. If the input is:
Drums
Zildjian
2015
2500
Guitar
Gibson
2002
1200
6
19
the output is:
Instrument Information:
Name: Drums
Manufacturer: Zildjian
Year built: 2015
Cost: 2500
Instrument Information:
Name: Guitar
Manufacturer: Gibson
Year built: 2002
Cost: 1200
Number of strings: 6
Number of frets: 19
Transcribed Image Text:Given main() and the Instrument class, define a derived class, StringInstrument, for string instruments. Ex. If the input is: Drums Zildjian 2015 2500 Guitar Gibson 2002 1200 6 19 the output is: Instrument Information: Name: Drums Manufacturer: Zildjian Year built: 2015 Cost: 2500 Instrument Information: Name: Guitar Manufacturer: Gibson Year built: 2002 Cost: 1200 Number of strings: 6 Number of frets: 19
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