Answered: Based on the below code do the…

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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Question

Based on the below code do the following tasks:

EntryScreen
should be adjusted so that the when the option ‘B’ is selected from the main menu, the screen is
updated to show a bus management menu. If the option to add a bus is selected, the screen should
display options for the type of menu to be shown. The entry screens should allow the subclasses of
class bus to be populated. Figure 3 provides an example of the expected display. look at image uploaded

import java.util.ArrayList;

import java.util.Collections;

import java.util.Scanner;

public class EntryScreen {

public EntryScreen() {}

public ArrayList<Planner> managePlanners(Scanner scan,ArrayList<Planner> plans, Ministry mny, ArrayList<Bus> buses) throws NumberFormatException

{

ReportScreen r = new ReportScreen();

char mchoice = 'c';

String menu="";

while (mchoice!='X')

{

String menuOptions = "[A]dd/Create planner\n[E]dit/Update planner\n";

menuOptions+="[L]ist/Read planner\n[D]elete planner\nE[x]it\n";

System.out.println(menuOptions);

menu = scan.next().toUpperCase();

mchoice = menu.charAt(0);

switch(mchoice)

{

case 'A':{

Planner p = createPlanner(scan, mny, buses);

if (p!=null)

plans.add(p);

break;

}

case 'L':{

Collections.sort(plans);

r.listPlanners(plans, System.out);

break;

}

case 'E':{

System.out.println("Please enter the ID of the planner to be updated:");

int pid = Integer.parseInt(scan.next());

int pdx = findPlanner(plans,pid);

if (pdx>=0)

plans.get(pdx).updateLocalData(scan);

else

System.out.println("Planner with id "+pid+ " not found.");

break;

}

case 'D':{

System.out.println("Please enter the ID of the planner to be deleted:");

int pid = Integer.parseInt(scan.next());

int pdx = findPlanner(plans,pid);

if (pdx>=0)

plans.remove(pdx);

else

System.out.println("Planner with id "+pid+ " not found.");

break;

}

return plans;

}

public Planner createPlanner( Scanner scan, Ministry mny, ArrayList<Bus> buses)

{

Planner p = null;

try

{

System.out.println("Please enter Planner Name:");

String name = scan.next();

System.out.println("Please enter Planner Budget:");

int budget = Integer.parseInt(scan.next());

p = new Planner(name, budget, mny, buses);

}

catch(NumberFormatException nfe)

{}

return p;

}

public int findPlanner(ArrayList<Planner> plans, int pid)

{

int pdx =-1;

int currdx=0;

while ((currdx<plans.size())&&(pdx==-1))

{

if (plans.get(currdx).getId()==pid)

pdx = currdx;

currdx++;

}

return pdx;

}

public int findBus(ArrayList<Bus> buses, int bid)

{

int bdx=-1;

////code needed here to find bus with id bid in arraylist of buses

return bdx;

}

#
cols
4
456
5
6
7
Bus
Type
Generic
name Size
Price Level
Training name size Price level
name size price
Level
Level
Colo Col1 Col2 Col3
Sport
Party
Name size price
Tablo 1
Col4
Teacher Area
Spectator Area
Spectator Area
61
Col5
Col6
#Security
#Security Bar Area

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