[JAVA]Question 4: Write the source code of the classes ReportCurrentRevenue and ReportPastIncome. The ReportCurrentRevenue class is responsible from calculating the current amount of money to be gained if all the guests would leave from the hotel. The ReportPastIncome class is responsible from calculating the money gained so far from the previous visits of guests. Class Hotel will create one instance of this class and execute it in multithreaded fashion in its report method. You will code Hotel.report in the next question.Question 5: Write the source code of only the following methods of the class Hotel. The explanations of the methods you need to code are given below. Don’t forget to address the multithreading issues when coding.report: The details of this method are given in Question 4.restore: This method loads the Hashtable members and LinkedList visits from the path given by the fileName parameter. However, if there are ongoing multithreaded operations, it must first wait them to be finished.findRoomNrOfGuest: This method returns the room number of a guest whose name is given by the method parameter. It returns 0 if no such guest exists. HotelReportPastincome|- rooms : Hashtable|- visits : LinkedList|- pool : ExecutorService- addRoom( Room)- addRoom( roomNr: int, capacity : int, rate : double )- searchGuest( name : String ): Guest|- newArrivalToRoom( aGuest: Guest, roomNr: int )- addGuestToRoom( aGuest: Guest, roomNr: int)- findRoomNrOfGuest( name : String): int|- emptyRoom( roomNr: int )|- report()- backup( fileName : String )|- restore( fileName : String )ReportCurrentRevenue1checkedCriticalExceptionNonCriticalExceptionunchecked1«Abstract»RoomPersonVisit|- roomNr: int {final}- maxRoomCapacity : int {final, static}|- dailyRate : double|- guests : LinkedList-v: Visit+ Room(roomNr: int , capacity : int, dailyRate : double )setCapacity( int )+ setDailyRate( double )+ addGuest( Guest)+ emptyRoom( ): Visit+ searchGuest( name : String): Guest+ toString(): StringgetGuestNames(): String+ getVisit( ) : Visit|- name, address, phoneNr: String+ Person( name : String, nationallD: int)-from, to : java.util.DateguestNames : StringtotalPrice : double+ Visit( from : Date, room: Room)+ endVisit( )getTotalPrice(): double+ getCurrentRevenue( ): double- getVisitDurationInDays( begin, end : Date ): long0.1EmployeeGuest|- emplD : int {final}|- enlisted : java.util.Date :Hotel:RoomV: VisitquestsemptyRoom( )endvisit( )to = new Date()getDailyRate( )r calculate how many dayshave been passed /ratetotalPrice = days * rategetGuestNames( )namesguestNames = namesnew()

The below are the source codes for classes Hotel, Report Current Revenue and Report Past Income as…

Answered: Question 4: Write the source code of…

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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[JAVA]

Question 4: Write the source code of the classes ReportCurrentRevenue and ReportPastIncome. The ReportCurrentRevenue class is responsible from calculating the current amount of money to be gained if all the guests would leave from the hotel. The ReportPastIncome class is responsible from calculating the money gained so far from the previous visits of guests. Class Hotel will create one instance of this class and execute it in multithreaded fashion in its report method. You will code Hotel.report in the next question.

Question 5: Write the source code of only the following methods of the class Hotel. The explanations of the methods you need to code are given below. Don’t forget to address the multithreading issues when coding.

report: The details of this method are given in Question 4.
restore: This method loads the Hashtable members and LinkedList visits from the path given by the fileName parameter. However, if there are ongoing multithreaded operations, it must first wait them to be finished.
findRoomNrOfGuest: This method returns the room number of a guest whose name is given by the method parameter. It returns 0 if no such guest exists.

Hotel
ReportPastincome
|- rooms : Hashtable<Integer,Room>
|- visits : LinkedList<Visit>
|- pool : ExecutorService
- addRoom( Room)
- addRoom( roomNr: int, capacity : int, rate : double )
- searchGuest( name : String ): Guest
|- newArrivalToRoom( aGuest: Guest, roomNr: int )
- addGuestToRoom( aGuest: Guest, roomNr: int)
- findRoomNrOfGuest( name : String): int
|- emptyRoom( roomNr: int )
|- report()
- backup( fileName : String )
|- restore( fileName : String )
ReportCurrentRevenue
1
checked
CriticalException
NonCriticalException
unchecked
1
«Abstract»
Room
Person
Visit
|- roomNr: int {final}
- maxRoomCapacity : int {final, static}
|- dailyRate : double
|- guests : LinkedList<Guest>
-v: Visit
+ Room(roomNr: int , capacity : int, dailyRate : double )
setCapacity( int )
+ setDailyRate( double )
+ addGuest( Guest)
+ emptyRoom( ): Visit
+ searchGuest( name : String): Guest
+ toString(): String
getGuestNames(): String
+ getVisit( ) : Visit
|- name, address, phoneNr: String
+ Person( name : String, nationallD: int)
-from, to : java.util.Date
guestNames : String
totalPrice : double
+ Visit( from : Date, room: Room)
+ endVisit( )
getTotalPrice(): double
+ getCurrentRevenue( ): double
- getVisitDurationInDays( begin, end : Date ): long
0.1
Employee
Guest
|- emplD : int {final}
|- enlisted : java.util.Date

:Hotel
:Room
V: Visit
quests
emptyRoom( )
endvisit( )
to = new Date()
getDailyRate( )
r calculate how many days
have been passed /
rate
totalPrice = days * rate
getGuestNames( )
names
guestNames = names
new()

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