Thread: How to implement a hostel management application for more than one apartment unit?

Hi. I need to design a program to manage the university apartment/hostel. The program must be able to carry out the basic tasks:
1. Register a new student
2. Remove a student
3. Search for a student
4. Generate a report of the apartment's occupancy

There are two types of apartments, type A and type B. type A has 2 rooms (but able to house 3 students) and type B has 2 rooms and one master bedroom.


I have almost completed the program. I still have not implemented feature '3' (search for a student). The problem is that my program only works for one unit of type A and one unit of type B. I would like to know how to design the program so that it works for maybe 10 units of type A and 10 units of type B.

Also, I would like to know how to I delete a student automatically when the rental expires, which means I do not have to use feature '2' and remove a student manually.

import java.util.*; import java.io.*; import javax.swing.JOptionPane; import java.text.DecimalFormat;   public class ApartmentManagement {   public static void main(String[] args) throws IOException {  	DecimalFormat twoDecimals = new DecimalFormat("0.00");  	String input;	int task;	String apartment;	int choice;	String confirmation;	char confirm;  	String name;	String IDinput;	int ID;	String[] todayDate = new String[6];	String[] expiryDate = new String[6];  	String[] nameA = new String[6];	int[] ID_A = new int[6];  	String[] nameB = new String[6];	int[] ID_B = new int[6];  	String[] nameB_master = new String[1];	int[] ID_B_master = new int[6];  	int A = 0;	int B = 0;	int IDno = 0;	int tDate = 0;	int eDate = 0;  	Student studentInfo = new Student();	Apartment apt = new Apartment();  	GregorianCalendar gcalendar = new GregorianCalendar();  	String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};  	String inputDel;	int searchDel;  	String inputreturn;	char returnToMenu;     do {	input = JOptionPane.showInputDialog("Welcome user.\n" + "This is a program to manage the university apartments.\n" + "Please enter the task of your choice: \n\n" +	"1. Register a new student and assign an apartment.\n" +	"2. Update the apartment status.\n" +	"3. Generate a report of the apartment status.\n" +	"4. Search for a student's apartment unit.\n" +	"5. Exit the program.");  	task = Integer.parseInt(input);    	switch (task) { //====================================================== Task 1 =========================================================================== case 1:	JOptionPane.showMessageDialog(null, "You selected task 1:\n" + "Register a new student and assign an apartment.\n" + "Click OK to continue.");  	apartment = JOptionPane.showInputDialog("There are two different types of apartment for rent.\n" +	"Type A: 2 bedrooms with kitchen and laundry facilities.\n" +	"Monthly rental: RM300 per room\n\n" +	"Type B: 3 bedrooms including one master bedroom with attached bathroom " +	"but without kitchen and laundry facilities.\n" +	"Monthly rental: RM200 per room, master bedroom costs additional 40%.\n\n" +	"For Type A, enter 1.\n" +	"For Type B, enter 2.\n" +	"For Type B master bedroom, enter 3.\n" +	"Please enter your choice.");  	choice = Integer.parseInt(apartment);  	if(choice == 1)	{	confirmation = JOptionPane.showInputDialog("You have selected apartment Type A.\n" + "Enter 'Y' to confirm.");  	confirm = confirmation.charAt(0);	if (confirm == 'Y' || confirm == 'y') if (apt.getTypeA() >= 3)	JOptionPane.showMessageDialog(null, "Type A apartment is already full. Please select another apartment");   else if (apt.getTypeA() < 3) {	name = JOptionPane.showInputDialog("Please enter the student's name.");	IDinput = JOptionPane.showInputDialog("Please enter the student's ID.");	ID = Integer.parseInt(IDinput);  	studentInfo.storeName(name);	studentInfo.storeID(ID);  	nameA[A] = studentInfo.getName();	ID_A[IDno] = studentInfo.getID();  	apt.TypeAoccupied();  	JOptionPane.showMessageDialog(null, "The amount to be paid upon registration: \n" + "RM" + twoDecimals.format(apt.getMonthlycostA()) + " for rental this month\n" + "RM100.00 for utility charges and rental deposit for a month\n\n" + "Total: RM" +twoDecimals.format(apt.getcostA()) + "\n\n" + "Please pay RM" + twoDecimals.format(apt.getMonthlycostA()) + " for the following months till the rental expires.");  	todayDate[tDate] = ((gcalendar.get(Calendar.DATE))+"-"+(months[gcalendar.get(Calendar.MONTH)])+"-"+(gcalendar.get(Calendar.YEAR)) );  	gcalendar.add(Calendar.DATE, + 140);	expiryDate[eDate] = ((gcalendar.get(Calendar.DATE))+"-"+(months[gcalendar.get(Calendar.MONTH)])+"-"+(gcalendar.get(Calendar.YEAR)) );    	JOptionPane.showMessageDialog(null, "Registration details: \n\n" + "Name: " + nameA[A] + "\n" + "Student ID: " + ID_A[IDno] + "\n" + "Date of registration: " + todayDate[tDate] + "\n" + "Rental expiry date: " + expiryDate[eDate]);  	A++;	IDno++;	tDate++;	eDate++; }	}    	if(choice == 2)	{	confirmation = JOptionPane.showInputDialog("You have selected apartment Type B.\n" + "Enter 'Y' to confirm.");  	confirm = confirmation.charAt(0);	if (confirm == 'Y' || confirm == 'y') if (apt.getTypeB() >= 2)	JOptionPane.showMessageDialog(null, "Type B apartment is already full. Please select another apartment");   else if (apt.getTypeB() < 2) {	name = JOptionPane.showInputDialog("Please enter the student's name.");	IDinput = JOptionPane.showInputDialog("Please enter the student's ID.");	ID = Integer.parseInt(IDinput);  	studentInfo.storeName(name);	studentInfo.storeID(ID);  	nameB[B] = studentInfo.getName();	ID_B[IDno] = studentInfo.getID();  	apt.TypeBoccupied();  	JOptionPane.showMessageDialog(null, "The amount to be paid upon registration: \n" + "RM" + twoDecimals.format(apt.getMonthlycostB()) + " for rental this month\n" + "RM100.00 for utility charges and rental deposit for a month\n\n" + "Total: RM" +twoDecimals.format(apt.getcostB()) + "\n\n" + "Please pay RM" + twoDecimals.format(apt.getMonthlycostB()) + " for the following months till the rental expires.");  	todayDate[tDate] = ((gcalendar.get(Calendar.DATE))+"-"+(months[gcalendar.get(Calendar.MONTH)])+"-"+(gcalendar.get(Calendar.YEAR)) );  	gcalendar.add(Calendar.DATE, + 140);	expiryDate[eDate] = ((gcalendar.get(Calendar.DATE))+"-"+(months[gcalendar.get(Calendar.MONTH)])+"-"+(gcalendar.get(Calendar.YEAR)) );    	JOptionPane.showMessageDialog(null, "Registration details: \n\n" + "Name: " + nameB[B] + "\n" + "Student ID: " + ID_B[IDno] + "\n" + "Date of registration: " + todayDate[tDate] + "\n" + "Rental expiry date: " + expiryDate[eDate]);  	B++;	IDno++;	tDate++;	eDate++; }	}  	if(choice == 3)	{	confirmation = JOptionPane.showInputDialog("You have selected apartment Type B master bedroom.\n" + "Enter 'Y' to confirm.");  	confirm = confirmation.charAt(0);	if (confirm == 'Y' || confirm == 'y') if (apt.getTypeB_master() >= 1)	JOptionPane.showMessageDialog(null, "Type B master bedroom is already full. Please select another apartment");   else if (apt.getTypeB_master() < 1) {	name = JOptionPane.showInputDialog("Please enter the student's name.");	IDinput = JOptionPane.showInputDialog("Please enter the student's ID.");	ID = Integer.parseInt(IDinput);  	studentInfo.storeName(name);	studentInfo.storeID(ID);  	nameB_master[0] = studentInfo.getName();	ID_B_master[IDno] = studentInfo.getID();  	apt.TypeB_masteroccupied();  	JOptionPane.showMessageDialog(null, "The amount to be paid upon registration: \n" + "RM" + twoDecimals.format(apt.getMonthlycostB_master()) + " for rental this month\n" + "RM100.00 for utility charges and rental deposit for a month\n\n" + "Total: RM" +twoDecimals.format(apt.getcostB_master()) + "\n\n" + "Please pay RM" + twoDecimals.format(apt.getMonthlycostB_master()) + " for the following months till the rental expires.");  	todayDate[tDate] = ((gcalendar.get(Calendar.DATE))+"-"+(months[gcalendar.get(Calendar.MONTH)])+"-"+(gcalendar.get(Calendar.YEAR)) );  	gcalendar.add(Calendar.DATE, + 140);	expiryDate[eDate] = ((gcalendar.get(Calendar.DATE))+"-"+(months[gcalendar.get(Calendar.MONTH)])+"-"+(gcalendar.get(Calendar.YEAR)) );    	JOptionPane.showMessageDialog(null, "Registration details: \n\n" + "Name: " + nameB_master[0] + "\n" + "Student ID: " + ID_B_master[IDno] + "\n" + "Date of registration: " + todayDate[tDate] + "\n" + "Rental expiry date: " + expiryDate[eDate]);  	IDno++;	tDate++;	eDate++; }	}	break;   //====================================================== Task 2 =========================================================================== case 2:	JOptionPane.showMessageDialog(null, "You selected task 2:\n" + "Update the apartment status.\n" + "This task is to remove a student from an apartment.\n" + "Click OK to continue.");  	if (apt.getTypeA() == 0 && apt.getTypeB() == 0 && apt.getTypeB_master() == 0)	{	JOptionPane.showMessageDialog(null, "There are currently no student registered in " + "any of the apartment units.");	}	else	{	inputDel = JOptionPane.showInputDialog("Please enter the ID of the student " +	"you wish to delete.");  	searchDel = Integer.parseInt(inputDel);  	for(int i = 0; i <= apt.getTypeA(); i++)	{	if(searchDel == ID_A[i])	{ confirmation = JOptionPane.showInputDialog("The following student will be removed:\n" + "Name: " + nameA[i] + "\n" + "ID: " + ID_A[i] + "\n\n" + "Enter 'Y' to confirm."); confirm = confirmation.charAt(0);   if(confirm == 'Y' || confirm == 'y') {	nameA[i] = null;	ID_A[i] = 0;	apt.TypeAvacant();  	JOptionPane.showMessageDialog(null, "The particular student has been removed.\n" + "Apartment Type A now has " + (3 - apt.getTypeA()) + " rooms available.");   }  	}	}  	for(int i = 0; i <= apt.getTypeB(); i++)	{	if(searchDel == ID_B[i])	{ confirmation = JOptionPane.showInputDialog("The following student will be removed:\n" + "Name: " + nameB[i] + "\n" + "ID: " + ID_B[i] + "\n\n" + "Enter 'Y' to confirm."); confirm = confirmation.charAt(0);   if(confirm == 'Y' || confirm == 'y') {	nameB[i] = null;	ID_B[i] = 0;	apt.TypeBvacant();  	JOptionPane.showMessageDialog(null, "The particular student has been removed.\n" + "Apartment Type A now has " + (2 - apt.getTypeB()) + " rooms available."); }	}	}  	for(int i = 0; i <= apt.getTypeB_master(); i++)	{	if(searchDel == ID_B_master[i])	{ confirmation = JOptionPane.showInputDialog("The following student will be removed:\n" + "Name: " + nameB_master[i] + "\n" + "ID: " + ID_B_master[i] + "\n\n" + "Enter 'Y' to confirm."); confirm = confirmation.charAt(0);   if(confirm == 'Y' || confirm == 'y') {	nameB_master[i] = null;	ID_B_master[i] = 0;	apt.TypeB_mastervacant();  	JOptionPane.showMessageDialog(null, "The particular student has been removed.\n" + "Apartment Type A now has " + (1 - apt.getTypeB_master()) + " rooms available."); }	}	}	}	break;   //====================================================== Task 3 =========================================================================== case 3:	JOptionPane.showMessageDialog(null, "You selected task 3:\n" + "Generate a report of the apartment status.\n" + "Click OK to continue.");    	if (apt.getTypeA() == 0 && apt.getTypeB() == 0 && apt.getTypeB_master() == 0)	{	JOptionPane.showMessageDialog(null, "There are currently no student registered in " + "any of the apartment units.");	}  	else	{	for(int i = 0; i <= apt.getTypeA(); i++)	{	JOptionPane.showMessageDialog(null, "These are the list of students staying " + "in apartment Type A: \n" + "Name: " + nameA[i] + "\n" + "ID: " + ID_A[i] + "\n" + "Date of registration: " + todayDate[i] + "\n" + "Date of rental expiry: " + expiryDate[i] + "\n\n");	}  	for(int i = 0; i <= apt.getTypeB(); i++)	{	JOptionPane.showMessageDialog(null, "These are the list of students staying " + "in apartment Type B: \n" + "Name: " + nameB[i] + "\n" + "ID: " + ID_B[i] + "\n" + "Date of registration: " + todayDate[i] + "\n" + "Date of rental expiry: " + expiryDate[i] + "\n\n");	}  	for(int i = 0; i <= apt.getTypeB_master(); i++)	{	JOptionPane.showMessageDialog(null, "These are the list of students staying " + "in apartment Type B master bedroom: \n" + "Name: " + nameB_master[i] + "\n" + "ID: " + ID_B_master[i] + "\n" + "Date of registration: " + todayDate[i] + "\n" + "Date of rental expiry: " + expiryDate[i] + "\n\n");	}  	JOptionPane.showMessageDialog(null, "The total number of occupants in the following apartments are: \n" + "Type A: " + apt.getTypeA() + "\n" + "Type B: " + apt.getTypeB() + "\n" + "Type B master bedroom: " + apt.getTypeB_master() + "\n\n");  	JOptionPane.showMessageDialog(null, "The total number of vacant rooms in the following apartments are: \n" + "Type A: " + (3 - apt.getTypeA()) + "\n" + "Type B: " + (2 - apt.getTypeB()) + "\n" + "Type B master bedroom: " + (1 - apt.getTypeB_master()) + "\n\n");  	}	break;   }   inputreturn = JOptionPane.showInputDialog("Do you want to return to the main menu?\n" + "Enter 'Y' for yes.");   returnToMenu = inputreturn.charAt(0);   } while(returnToMenu == 'Y' || returnToMenu == 'y');   System.exit(0); } }

I'm using Student class and Apartment class. Here are the source code for Student.class and Apartment.class

public class Student {	private String Name;	private int Student_ID;	private String delete = null;	private int ID_delete = 0;    	/*public Student(String studentName, int studentID)	{	Name = studentName;	Student_ID = studentID;	}*/  	public void storeName(String studentName)	{	Name = studentName;	}  	public void storeID(int studentID)	{	Student_ID = studentID;	}  	public String getName()	{	return Name;	}  	public int getID()	{	return Student_ID;	} }

class Apartment {	private int TypeA;	private int TypeB;	private int TypeB_master;  	private final double MonthlycostA;	private final double MonthlycostB;	private final double MonthlycostB_master;  	private final double costA;	private final double costB;	private final double costB_master;  	public Apartment()	{	TypeA = 0;	TypeB = 0;	TypeB_master = 0;  	MonthlycostA = 300.00;	MonthlycostB = 200.00;	MonthlycostB_master = (1.4f)*(MonthlycostB);  	costA = 400.00;	costB = 300.00;	costB_master = 380.00;	}  	public void TypeAoccupied()	{	TypeA++;	}	public void TypeAvacant()	{	TypeA--;	}	public void TypeBoccupied()	{	TypeB++;	}	public void TypeBvacant()	{	TypeB--;	}	public void TypeB_masteroccupied()	{	TypeB_master++;	}	public void TypeB_mastervacant()	{	TypeB_master--;	}  	public double getcostA()	{	return costA;	}	public double getcostB()	{	return costB;	}	public double getcostB_master()	{	return costB_master;	}  	public double getMonthlycostA()	{	return MonthlycostA;	}	public double getMonthlycostB()	{	return MonthlycostB;	}	public double getMonthlycostB_master()	{	return MonthlycostB_master;	}  	public int getTypeA()	{	return TypeA;	}	public int getTypeB()	{	return TypeB;	}	public int getTypeB_master()	{	return TypeB_master;	} }

I hope my problem would be solved. Thanks

How do you do it for just one? ...do that ten times