A java application to implement hospital management system

This Hospital management application performs the following operations.

1. Register a patient with following details Patient-Name, patient Address, Age, Patient-Sex, Patient-Illness,Amount-for-Appointment.
2. Update entered patient details
3. Display patient detials
4. Remove inactive patient. A patient is treated as inactive if he is 15 days old from the the date of admit to the hospital.

HospitalProcess.java

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package Hospital;   import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.*; import java.io.*;   public class HospitalProcess {   static ArrayList arl = new ArrayList(); static String joindate;   public static void main(String[] args) throws IOException {   char l='i'; Calendar currentDate = Calendar.getInstance(); SimpleDateFormat "IL_AD3" class="IL_AD">formatter=  new SimpleDateFormat("yyyy/MMM/dd HH:mm:ss"); joindate = formatter.format(currentDate.getTime());   Patient p1 = new Patient(1,"Raja", "Miyapur,Hyderabad" ,40 ,'m' ,"Fever" ,250f ,joindate); arl.add(p1); Patient p2 = new Patient(2,"Rani", "Madhapur,Hyderabad" ,45 ,'f' ,"Cough" ,250f ,joindate); arl.add(p2); Patient p3 = new Patient(3,"James", "Hydernagar,Hyderabad" ,56 ,'m' ,"Cancer" ,300f ,joindate); arl.add(p3); do {   Patient p = new Patient(); System.out.println("Press 1 to register a Patient,2 to update Patient details,3 to deactivate Patient details,4 to display  Patient details,"); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int choice =Integer.parseInt(br.readLine());   switch(choice) { case 1: p.registerPatient(); System.out.println("Patient Registered Successfully !!!"); p.showPatientDetails(); break; case 2: p.showPatientDetails(); p.updatePatientDetails();   break; case 3: p.removeInactivePatient(); break; case 4: Collections.sort(arl); p.showPatientDetails(); break; default: System.out.println("Patient with that id doesnot exists"); System.out.println("Try again"); break; }   System.out.println("Do you wanna continue selecting options(y/n):"); l=(char)br.read(); }while(l=='y'); }   }

Paatient.java

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class Patient implements Comparable {   int patientID; String patientName; String patientAddress; int age; char patientSex; String patientIllness; float amountForAppointment; String joindate;   HospitalProcess hm = new HospitalProcess();   Patient()    {}   public int compareTo(Patient p) { return this.patientID-p.patientID; }   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));   Patient(int patientID,String patientName,String patientAddress,int age,char patientSex,String patientIllness,float amountForAppointment, String joindate) { this.patientID=patientID; this.patientName=patientName; this.patientAddress=patientAddress; this.age=age; this.patientSex=patientSex; this.patientIllness=patientIllness; this.amountForAppointment=amountForAppointment; this.joindate = joindate; }   void registerPatient()throws IOException { Patient pr = new Patient(); pr.showPatientDetails(); int patientID=hm.arl.size(); pr.patientID = patientID+1; System.out.println("Enter Patient name:"); pr.patientName = br.readLine(); System.out.println("Enter Patient Address:"); pr.patientAddress =br.readLine(); System.out.println("Enter Patient Age:"); pr.age =Integer.parseInt(br.readLine()); System.out.println("Enter Patient Sex:"); String temp = br.readLine(); pr.patientSex =temp.charAt(0); System.out.println("Enter Patient Illness:"); pr.patientIllness =br.readLine(); System.out.println("Enter the amount patient needs to pay for appointment:"); pr.amountForAppointment =Float.parseFloat(br.readLine()); pr.joindate = hm.joindate; hm.arl.add(pr);   }

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A java application to implement hospital management system