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