From 3e13cca5271359b412f6da662406c440e888828e Mon Sep 17 00:00:00 2001
From: chittakushal <111438028+chittakushal@users.noreply.github.com>
Date: Sat, 4 May 2024 19:27:55 +0530
Subject: [PATCH 1/4] Add files via upload

---
 HospitalSystemDemo.java | 134 ++++++++++++++++++++++++++++++++++
 Main.java               | 154 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 288 insertions(+)
 create mode 100644 HospitalSystemDemo.java
 create mode 100644 Main.java

diff --git a/HospitalSystemDemo.java b/HospitalSystemDemo.java
new file mode 100644
index 0000000..1eca880
--- /dev/null
+++ b/HospitalSystemDemo.java
@@ -0,0 +1,134 @@
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.*;
+
+class Patient {
+    private String name;
+    private int age;
+    private String gender;
+    private String address;
+    private String phoneNumber;
+
+    public Patient(String name, int age, String gender, String address, String phoneNumber) {
+        this.name = name;
+        this.age = age;
+        this.gender = gender;
+        this.address = address;
+        this.phoneNumber = phoneNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public String toString() {
+        return "Name: " + name + ", Age: " + age + ", Gender: " + gender + ", Address: " + address + ", Phone: " + phoneNumber;
+    }
+}
+
+class HospitalManagementSystem {
+    private List<Patient> patientRecords;
+    private Map<Date, List<Patient>> appointmentSchedule;
+
+    public HospitalManagementSystem() {
+        patientRecords = new ArrayList<>();
+        appointmentSchedule = new HashMap<>();
+    }
+
+    public void addPatientRecord(Patient patient) {
+        patientRecords.add(patient);
+    }
+
+    public void scheduleAppointment(Date date, Patient patient) {
+        appointmentSchedule.computeIfAbsent(date, k -> new ArrayList<>()).add(patient);
+    }
+
+    public void displayPatientRecords() {
+        System.out.println("Patient Records:");
+        for (Patient patient : patientRecords) {
+            System.out.println(patient);
+        }
+    }
+
+    public void displayAppointmentSchedule() {
+        System.out.println("Appointment Schedule:");
+        for (Map.Entry<Date, List<Patient>> entry : appointmentSchedule.entrySet()) {
+            System.out.println("Date: " + entry.getKey());
+            System.out.println("Patients:");
+            for (Patient patient : entry.getValue()) {
+                System.out.println(patient);
+            }
+            System.out.println();
+        }
+    }
+
+    public Patient getPatientByName(String name) {
+        for (Patient patient : patientRecords) {
+            if (patient.getName().equals(name)) {
+                return patient;
+            }
+        }
+        return null;
+    }
+}
+
+public class HospitalSystemDemo {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        HospitalManagementSystem hospitalSystem = new HospitalManagementSystem();
+
+        System.out.println("Enter patient information (name, age, gender, address, phone), type 'done' to finish:");
+        while (true) {
+            System.out.print("Patient name: ");
+            String name = scanner.nextLine();
+            if (name.equals("done")) break;
+            System.out.print("Patient age: ");
+            int age = Integer.parseInt(scanner.nextLine());
+            System.out.print("Patient gender: ");
+            String gender = scanner.nextLine();
+            System.out.print("Patient address: ");
+            String address = scanner.nextLine();
+            System.out.print("Patient phone number: ");
+            String phoneNumber = scanner.nextLine();
+
+            hospitalSystem.addPatientRecord(new Patient(name, age, gender, address, phoneNumber));
+        }
+
+        System.out.println("Enter appointment scheduling (date YYYY-MM-DD, patient name), type 'done' to finish:");
+        while (true) {
+            System.out.print("Date (YYYY-MM-DD): ");
+            String dateString = scanner.nextLine();
+            if (dateString.equals("done")) break;
+            System.out.print("Patient name: ");
+            String patientName = scanner.nextLine();
+
+            Date date = parseDate(dateString);
+            if (date != null) {
+                Patient patient = hospitalSystem.getPatientByName(patientName);
+                if (patient != null) {
+                    hospitalSystem.scheduleAppointment(date, patient);
+                } else {
+                    System.out.println("Patient not found.");
+                }
+            } else {
+                System.out.println("Invalid date format.");
+            }
+        }
+
+        hospitalSystem.displayPatientRecords();
+        hospitalSystem.displayAppointmentSchedule();
+
+        scanner.close();
+    }
+
+    private static Date parseDate(String dateString) {
+        try {
+            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
+            return dateFormat.parse(dateString);
+        } catch (ParseException e) {
+            System.out.println("Error parsing date: " + e.getMessage());
+            return null;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Main.java b/Main.java
new file mode 100644
index 0000000..0444687
--- /dev/null
+++ b/Main.java
@@ -0,0 +1,154 @@
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+class BankAccount {
+    private String accountNumber;
+    private double balance;
+    private Map<String, Double> transactionHistory;
+
+    public BankAccount(String accountNumber, double initialBalance) {
+        this.accountNumber = accountNumber;
+        this.balance = initialBalance;
+        this.transactionHistory = new HashMap<>();
+    }
+
+    public void deposit(double amount) {
+        balance += amount;
+        transactionHistory.put("Deposit", amount);
+    }
+
+    public boolean withdraw(double amount) {
+        if (balance >= amount) {
+            balance -= amount;
+            transactionHistory.put("Withdrawal", -amount);
+            return true;
+        }
+        return false;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public Map<String, Double> getTransactionHistory() {
+        return transactionHistory;
+    }
+}
+
+class OnlineBankingSystem {
+    private Map<String, BankAccount> accounts;
+    private Scanner scanner;
+
+    public OnlineBankingSystem() {
+        accounts = new HashMap<>();
+        scanner = new Scanner(System.in);
+    }
+
+    public void createAccount() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        System.out.println("Enter initial balance:");
+        double initialBalance = scanner.nextDouble();
+        scanner.nextLine(); // Consume newline
+        BankAccount account = new BankAccount(accountNumber, initialBalance);
+        accounts.put(accountNumber, account);
+        System.out.println("Account created successfully.");
+    }
+
+    public void deposit() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Enter deposit amount:");
+            double amount = scanner.nextDouble();
+            scanner.nextLine(); // Consume newline
+            account.deposit(amount);
+            System.out.println("Deposit successful.");
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+
+    public void withdraw() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Enter withdrawal amount:");
+            double amount = scanner.nextDouble();
+            scanner.nextLine(); // Consume newline
+            if (account.withdraw(amount)) {
+                System.out.println("Withdrawal successful.");
+            } else {
+                System.out.println("Insufficient balance.");
+            }
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+
+    public void displayBalance() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Current balance: " + account.getBalance());
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+
+    public void displayTransactionHistory() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Transaction History:");
+            Map<String, Double> history = account.getTransactionHistory();
+            for (Map.Entry<String, Double> entry : history.entrySet()) {
+                System.out.println(entry.getKey() + ": " + entry.getValue());
+            }
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+}
+
+public class Main {
+    public static void main(String[] args) {
+        OnlineBankingSystem bankingSystem = new OnlineBankingSystem();
+        Scanner scanner = new Scanner(System.in);
+
+        while (true) {
+            System.out.println("\n1. Create Account\n2. Deposit\n3. Withdraw\n4. Display Balance\n5. Display Transaction History\n6. Exit\n");
+            System.out.println("Enter your choice:");
+            int choice = scanner.nextInt();
+            scanner.nextLine(); 
+            switch (choice) {
+                case 1:
+                    bankingSystem.createAccount();
+                    break;
+                case 2:
+                    bankingSystem.deposit();
+                    break;
+                case 3:
+                    bankingSystem.withdraw();
+                    break;
+                case 4:
+                    bankingSystem.displayBalance();
+                    break;
+                case 5:
+                    bankingSystem.displayTransactionHistory();
+                    break;
+                case 6:
+                    System.out.println("Exiting...");
+                    scanner.close();
+                    System.exit(0);
+                default:
+                    System.out.println("Invalid choice. Please enter a number from 1 to 6.");
+            }
+        }
+    }
+}

From 178e4c75eba869bb8e8d6b0fdecd5a9827032fd5 Mon Sep 17 00:00:00 2001
From: chittakushal <111438028+chittakushal@users.noreply.github.com>
Date: Sat, 4 May 2024 19:45:57 +0530
Subject: [PATCH 2/4] Delete Main.java

---
 Main.java | 154 ------------------------------------------------------
 1 file changed, 154 deletions(-)
 delete mode 100644 Main.java

diff --git a/Main.java b/Main.java
deleted file mode 100644
index 0444687..0000000
--- a/Main.java
+++ /dev/null
@@ -1,154 +0,0 @@
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Scanner;
-
-class BankAccount {
-    private String accountNumber;
-    private double balance;
-    private Map<String, Double> transactionHistory;
-
-    public BankAccount(String accountNumber, double initialBalance) {
-        this.accountNumber = accountNumber;
-        this.balance = initialBalance;
-        this.transactionHistory = new HashMap<>();
-    }
-
-    public void deposit(double amount) {
-        balance += amount;
-        transactionHistory.put("Deposit", amount);
-    }
-
-    public boolean withdraw(double amount) {
-        if (balance >= amount) {
-            balance -= amount;
-            transactionHistory.put("Withdrawal", -amount);
-            return true;
-        }
-        return false;
-    }
-
-    public double getBalance() {
-        return balance;
-    }
-
-    public Map<String, Double> getTransactionHistory() {
-        return transactionHistory;
-    }
-}
-
-class OnlineBankingSystem {
-    private Map<String, BankAccount> accounts;
-    private Scanner scanner;
-
-    public OnlineBankingSystem() {
-        accounts = new HashMap<>();
-        scanner = new Scanner(System.in);
-    }
-
-    public void createAccount() {
-        System.out.println("Enter account number:");
-        String accountNumber = scanner.nextLine();
-        System.out.println("Enter initial balance:");
-        double initialBalance = scanner.nextDouble();
-        scanner.nextLine(); // Consume newline
-        BankAccount account = new BankAccount(accountNumber, initialBalance);
-        accounts.put(accountNumber, account);
-        System.out.println("Account created successfully.");
-    }
-
-    public void deposit() {
-        System.out.println("Enter account number:");
-        String accountNumber = scanner.nextLine();
-        BankAccount account = accounts.get(accountNumber);
-        if (account != null) {
-            System.out.println("Enter deposit amount:");
-            double amount = scanner.nextDouble();
-            scanner.nextLine(); // Consume newline
-            account.deposit(amount);
-            System.out.println("Deposit successful.");
-        } else {
-            System.out.println("Account not found.");
-        }
-    }
-
-    public void withdraw() {
-        System.out.println("Enter account number:");
-        String accountNumber = scanner.nextLine();
-        BankAccount account = accounts.get(accountNumber);
-        if (account != null) {
-            System.out.println("Enter withdrawal amount:");
-            double amount = scanner.nextDouble();
-            scanner.nextLine(); // Consume newline
-            if (account.withdraw(amount)) {
-                System.out.println("Withdrawal successful.");
-            } else {
-                System.out.println("Insufficient balance.");
-            }
-        } else {
-            System.out.println("Account not found.");
-        }
-    }
-
-    public void displayBalance() {
-        System.out.println("Enter account number:");
-        String accountNumber = scanner.nextLine();
-        BankAccount account = accounts.get(accountNumber);
-        if (account != null) {
-            System.out.println("Current balance: " + account.getBalance());
-        } else {
-            System.out.println("Account not found.");
-        }
-    }
-
-    public void displayTransactionHistory() {
-        System.out.println("Enter account number:");
-        String accountNumber = scanner.nextLine();
-        BankAccount account = accounts.get(accountNumber);
-        if (account != null) {
-            System.out.println("Transaction History:");
-            Map<String, Double> history = account.getTransactionHistory();
-            for (Map.Entry<String, Double> entry : history.entrySet()) {
-                System.out.println(entry.getKey() + ": " + entry.getValue());
-            }
-        } else {
-            System.out.println("Account not found.");
-        }
-    }
-}
-
-public class Main {
-    public static void main(String[] args) {
-        OnlineBankingSystem bankingSystem = new OnlineBankingSystem();
-        Scanner scanner = new Scanner(System.in);
-
-        while (true) {
-            System.out.println("\n1. Create Account\n2. Deposit\n3. Withdraw\n4. Display Balance\n5. Display Transaction History\n6. Exit\n");
-            System.out.println("Enter your choice:");
-            int choice = scanner.nextInt();
-            scanner.nextLine(); 
-            switch (choice) {
-                case 1:
-                    bankingSystem.createAccount();
-                    break;
-                case 2:
-                    bankingSystem.deposit();
-                    break;
-                case 3:
-                    bankingSystem.withdraw();
-                    break;
-                case 4:
-                    bankingSystem.displayBalance();
-                    break;
-                case 5:
-                    bankingSystem.displayTransactionHistory();
-                    break;
-                case 6:
-                    System.out.println("Exiting...");
-                    scanner.close();
-                    System.exit(0);
-                default:
-                    System.out.println("Invalid choice. Please enter a number from 1 to 6.");
-            }
-        }
-    }
-}

From 1d517c8a293ac03c4a93b88156f3df61a678c2c5 Mon Sep 17 00:00:00 2001
From: chittakushal <111438028+chittakushal@users.noreply.github.com>
Date: Sat, 4 May 2024 19:46:16 +0530
Subject: [PATCH 3/4] Delete HospitalSystemDemo.java

---
 HospitalSystemDemo.java | 134 ----------------------------------------
 1 file changed, 134 deletions(-)
 delete mode 100644 HospitalSystemDemo.java

diff --git a/HospitalSystemDemo.java b/HospitalSystemDemo.java
deleted file mode 100644
index 1eca880..0000000
--- a/HospitalSystemDemo.java
+++ /dev/null
@@ -1,134 +0,0 @@
-import java.text.ParseException;
-import java.text.SimpleDateFormat;
-import java.util.*;
-
-class Patient {
-    private String name;
-    private int age;
-    private String gender;
-    private String address;
-    private String phoneNumber;
-
-    public Patient(String name, int age, String gender, String address, String phoneNumber) {
-        this.name = name;
-        this.age = age;
-        this.gender = gender;
-        this.address = address;
-        this.phoneNumber = phoneNumber;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    @Override
-    public String toString() {
-        return "Name: " + name + ", Age: " + age + ", Gender: " + gender + ", Address: " + address + ", Phone: " + phoneNumber;
-    }
-}
-
-class HospitalManagementSystem {
-    private List<Patient> patientRecords;
-    private Map<Date, List<Patient>> appointmentSchedule;
-
-    public HospitalManagementSystem() {
-        patientRecords = new ArrayList<>();
-        appointmentSchedule = new HashMap<>();
-    }
-
-    public void addPatientRecord(Patient patient) {
-        patientRecords.add(patient);
-    }
-
-    public void scheduleAppointment(Date date, Patient patient) {
-        appointmentSchedule.computeIfAbsent(date, k -> new ArrayList<>()).add(patient);
-    }
-
-    public void displayPatientRecords() {
-        System.out.println("Patient Records:");
-        for (Patient patient : patientRecords) {
-            System.out.println(patient);
-        }
-    }
-
-    public void displayAppointmentSchedule() {
-        System.out.println("Appointment Schedule:");
-        for (Map.Entry<Date, List<Patient>> entry : appointmentSchedule.entrySet()) {
-            System.out.println("Date: " + entry.getKey());
-            System.out.println("Patients:");
-            for (Patient patient : entry.getValue()) {
-                System.out.println(patient);
-            }
-            System.out.println();
-        }
-    }
-
-    public Patient getPatientByName(String name) {
-        for (Patient patient : patientRecords) {
-            if (patient.getName().equals(name)) {
-                return patient;
-            }
-        }
-        return null;
-    }
-}
-
-public class HospitalSystemDemo {
-    public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
-        HospitalManagementSystem hospitalSystem = new HospitalManagementSystem();
-
-        System.out.println("Enter patient information (name, age, gender, address, phone), type 'done' to finish:");
-        while (true) {
-            System.out.print("Patient name: ");
-            String name = scanner.nextLine();
-            if (name.equals("done")) break;
-            System.out.print("Patient age: ");
-            int age = Integer.parseInt(scanner.nextLine());
-            System.out.print("Patient gender: ");
-            String gender = scanner.nextLine();
-            System.out.print("Patient address: ");
-            String address = scanner.nextLine();
-            System.out.print("Patient phone number: ");
-            String phoneNumber = scanner.nextLine();
-
-            hospitalSystem.addPatientRecord(new Patient(name, age, gender, address, phoneNumber));
-        }
-
-        System.out.println("Enter appointment scheduling (date YYYY-MM-DD, patient name), type 'done' to finish:");
-        while (true) {
-            System.out.print("Date (YYYY-MM-DD): ");
-            String dateString = scanner.nextLine();
-            if (dateString.equals("done")) break;
-            System.out.print("Patient name: ");
-            String patientName = scanner.nextLine();
-
-            Date date = parseDate(dateString);
-            if (date != null) {
-                Patient patient = hospitalSystem.getPatientByName(patientName);
-                if (patient != null) {
-                    hospitalSystem.scheduleAppointment(date, patient);
-                } else {
-                    System.out.println("Patient not found.");
-                }
-            } else {
-                System.out.println("Invalid date format.");
-            }
-        }
-
-        hospitalSystem.displayPatientRecords();
-        hospitalSystem.displayAppointmentSchedule();
-
-        scanner.close();
-    }
-
-    private static Date parseDate(String dateString) {
-        try {
-            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
-            return dateFormat.parse(dateString);
-        } catch (ParseException e) {
-            System.out.println("Error parsing date: " + e.getMessage());
-            return null;
-        }
-    }
-}
\ No newline at end of file

From d0aec6c906e4332ddc05a431fd796daf110c40fb Mon Sep 17 00:00:00 2001
From: chittakushal <111438028+chittakushal@users.noreply.github.com>
Date: Sat, 4 May 2024 19:54:46 +0530
Subject: [PATCH 4/4] Add files via upload

---
 chitta kushal/HospitalSystemDemo.java      | 134 ++++++++++++++++++
 chitta kushal/OnlineBankingSystemMain.java | 154 +++++++++++++++++++++
 2 files changed, 288 insertions(+)
 create mode 100644 chitta kushal/HospitalSystemDemo.java
 create mode 100644 chitta kushal/OnlineBankingSystemMain.java

diff --git a/chitta kushal/HospitalSystemDemo.java b/chitta kushal/HospitalSystemDemo.java
new file mode 100644
index 0000000..1eca880
--- /dev/null
+++ b/chitta kushal/HospitalSystemDemo.java	
@@ -0,0 +1,134 @@
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.*;
+
+class Patient {
+    private String name;
+    private int age;
+    private String gender;
+    private String address;
+    private String phoneNumber;
+
+    public Patient(String name, int age, String gender, String address, String phoneNumber) {
+        this.name = name;
+        this.age = age;
+        this.gender = gender;
+        this.address = address;
+        this.phoneNumber = phoneNumber;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public String toString() {
+        return "Name: " + name + ", Age: " + age + ", Gender: " + gender + ", Address: " + address + ", Phone: " + phoneNumber;
+    }
+}
+
+class HospitalManagementSystem {
+    private List<Patient> patientRecords;
+    private Map<Date, List<Patient>> appointmentSchedule;
+
+    public HospitalManagementSystem() {
+        patientRecords = new ArrayList<>();
+        appointmentSchedule = new HashMap<>();
+    }
+
+    public void addPatientRecord(Patient patient) {
+        patientRecords.add(patient);
+    }
+
+    public void scheduleAppointment(Date date, Patient patient) {
+        appointmentSchedule.computeIfAbsent(date, k -> new ArrayList<>()).add(patient);
+    }
+
+    public void displayPatientRecords() {
+        System.out.println("Patient Records:");
+        for (Patient patient : patientRecords) {
+            System.out.println(patient);
+        }
+    }
+
+    public void displayAppointmentSchedule() {
+        System.out.println("Appointment Schedule:");
+        for (Map.Entry<Date, List<Patient>> entry : appointmentSchedule.entrySet()) {
+            System.out.println("Date: " + entry.getKey());
+            System.out.println("Patients:");
+            for (Patient patient : entry.getValue()) {
+                System.out.println(patient);
+            }
+            System.out.println();
+        }
+    }
+
+    public Patient getPatientByName(String name) {
+        for (Patient patient : patientRecords) {
+            if (patient.getName().equals(name)) {
+                return patient;
+            }
+        }
+        return null;
+    }
+}
+
+public class HospitalSystemDemo {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        HospitalManagementSystem hospitalSystem = new HospitalManagementSystem();
+
+        System.out.println("Enter patient information (name, age, gender, address, phone), type 'done' to finish:");
+        while (true) {
+            System.out.print("Patient name: ");
+            String name = scanner.nextLine();
+            if (name.equals("done")) break;
+            System.out.print("Patient age: ");
+            int age = Integer.parseInt(scanner.nextLine());
+            System.out.print("Patient gender: ");
+            String gender = scanner.nextLine();
+            System.out.print("Patient address: ");
+            String address = scanner.nextLine();
+            System.out.print("Patient phone number: ");
+            String phoneNumber = scanner.nextLine();
+
+            hospitalSystem.addPatientRecord(new Patient(name, age, gender, address, phoneNumber));
+        }
+
+        System.out.println("Enter appointment scheduling (date YYYY-MM-DD, patient name), type 'done' to finish:");
+        while (true) {
+            System.out.print("Date (YYYY-MM-DD): ");
+            String dateString = scanner.nextLine();
+            if (dateString.equals("done")) break;
+            System.out.print("Patient name: ");
+            String patientName = scanner.nextLine();
+
+            Date date = parseDate(dateString);
+            if (date != null) {
+                Patient patient = hospitalSystem.getPatientByName(patientName);
+                if (patient != null) {
+                    hospitalSystem.scheduleAppointment(date, patient);
+                } else {
+                    System.out.println("Patient not found.");
+                }
+            } else {
+                System.out.println("Invalid date format.");
+            }
+        }
+
+        hospitalSystem.displayPatientRecords();
+        hospitalSystem.displayAppointmentSchedule();
+
+        scanner.close();
+    }
+
+    private static Date parseDate(String dateString) {
+        try {
+            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
+            return dateFormat.parse(dateString);
+        } catch (ParseException e) {
+            System.out.println("Error parsing date: " + e.getMessage());
+            return null;
+        }
+    }
+}
\ No newline at end of file
diff --git a/chitta kushal/OnlineBankingSystemMain.java b/chitta kushal/OnlineBankingSystemMain.java
new file mode 100644
index 0000000..c10d1f5
--- /dev/null
+++ b/chitta kushal/OnlineBankingSystemMain.java	
@@ -0,0 +1,154 @@
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+class BankAccount {
+    private String accountNumber;
+    private double balance;
+    private Map<String, Double> transactionHistory;
+
+    public BankAccount(String accountNumber, double initialBalance) {
+        this.accountNumber = accountNumber;
+        this.balance = initialBalance;
+        this.transactionHistory = new HashMap<>();
+    }
+
+    public void deposit(double amount) {
+        balance += amount;
+        transactionHistory.put("Deposit", amount);
+    }
+
+    public boolean withdraw(double amount) {
+        if (balance >= amount) {
+            balance -= amount;
+            transactionHistory.put("Withdrawal", -amount);
+            return true;
+        }
+        return false;
+    }
+
+    public double getBalance() {
+        return balance;
+    }
+
+    public Map<String, Double> getTransactionHistory() {
+        return transactionHistory;
+    }
+}
+
+class OnlineBankingSystem {
+    private Map<String, BankAccount> accounts;
+    private Scanner scanner;
+
+    public OnlineBankingSystem() {
+        accounts = new HashMap<>();
+        scanner = new Scanner(System.in);
+    }
+
+    public void createAccount() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        System.out.println("Enter initial balance:");
+        double initialBalance = scanner.nextDouble();
+        scanner.nextLine(); // Consume newline
+        BankAccount account = new BankAccount(accountNumber, initialBalance);
+        accounts.put(accountNumber, account);
+        System.out.println("Account created successfully.");
+    }
+
+    public void deposit() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Enter deposit amount:");
+            double amount = scanner.nextDouble();
+            scanner.nextLine(); // Consume newline
+            account.deposit(amount);
+            System.out.println("Deposit successful.");
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+
+    public void withdraw() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Enter withdrawal amount:");
+            double amount = scanner.nextDouble();
+            scanner.nextLine(); // Consume newline
+            if (account.withdraw(amount)) {
+                System.out.println("Withdrawal successful.");
+            } else {
+                System.out.println("Insufficient balance.");
+            }
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+
+    public void displayBalance() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Current balance: " + account.getBalance());
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+
+    public void displayTransactionHistory() {
+        System.out.println("Enter account number:");
+        String accountNumber = scanner.nextLine();
+        BankAccount account = accounts.get(accountNumber);
+        if (account != null) {
+            System.out.println("Transaction History:");
+            Map<String, Double> history = account.getTransactionHistory();
+            for (Map.Entry<String, Double> entry : history.entrySet()) {
+                System.out.println(entry.getKey() + ": " + entry.getValue());
+            }
+        } else {
+            System.out.println("Account not found.");
+        }
+    }
+}
+
+public class OnlineBankingSystemMain {
+    public static void main(String[] args) {
+        OnlineBankingSystem bankingSystem = new OnlineBankingSystem();
+        Scanner scanner = new Scanner(System.in);
+
+        while (true) {
+            System.out.println("\n1. Create Account\n2. Deposit\n3. Withdraw\n4. Display Balance\n5. Display Transaction History\n6. Exit\n");
+            System.out.println("Enter your choice:");
+            int choice = scanner.nextInt();
+            scanner.nextLine(); 
+            switch (choice) {
+                case 1:
+                    bankingSystem.createAccount();
+                    break;
+                case 2:
+                    bankingSystem.deposit();
+                    break;
+                case 3:
+                    bankingSystem.withdraw();
+                    break;
+                case 4:
+                    bankingSystem.displayBalance();
+                    break;
+                case 5:
+                    bankingSystem.displayTransactionHistory();
+                    break;
+                case 6:
+                    System.out.println("Exiting...");
+                    scanner.close();
+                    System.exit(0);
+                default:
+                    System.out.println("Invalid choice. Please enter a number from 1 to 6.");
+            }
+        }
+    }
+}