Java Application to Implement Bank Functionality

The java program developed here is to implement bank functionality. The user can create an account, check, deposit money, withdraw, and also search account. At first, we created an interface called the central bank to do a few operations mentioned above. Then we created three subclass UNB, FGB, and NBD these classes will take customer account details and then we created a class Bankdriver to invoke all the methods in the subclasses.

Design of the application using a class diagram

Implementation

Implementing classes/ interfaces namely Customer, Account, and CentralBank with required member variables and functions

Java

public interface CentralBank< long getBalance(); void withdraw( long amount); void deposit( long amount); void showAccount(); boolean search(String acc_no);

Implementing the subclasses UNB, NBD, and FGB with required member variables and functions

UNB:

Java

public class unb implements CentralBank < String name; String accno; String acc_type; long balance; unb(String name, String accno, String acc_type, long balance)< this .name = name; this .accno = accno; this .acc_type = acc_type; this .balance = balance; public long getBalance()< return balance; public void withdraw( long amount)< if (balance >= amount) < balance = balance - amount; System.out.println( "Balance after withdrawal: " + balance); System.out.println( "Your balance is less than " + amount + "\tTransaction failed. " ); public void deposit( long amount)< balance = balance + amount; public void showAccount()< System.out.println( "UNB Bank account" ); System.out.println( "Name of account holder: " + name); System.out.println( "Account no.: " + accno); System.out.println( "Account type: " + acc_type); System.out.println( "Balance: " + balance); public boolean search(String ac_no) < if (accno.equals(ac_no)) < showAccount(); return ( true ); return ( false );

NBD:

Java

import java.util.*; public class nbd implements CentralBank < String name; String accno; String acc_type; long balance; nbd(String name, String accno, String acc_type, long balance)< this .name = name; this .accno = accno; this .acc_type = acc_type; this .balance = balance; public long getBalance()< return balance; public void withdraw( long amount)< if (balance >= amount) < balance = balance - amount; System.out.println( "Balance after withdrawal: " + balance); System.out.println( "Your balance is less than " + amount + "\tTransaction failed. " ); public void deposit( long amount)< balance = balance + amount; public void showAccount()< System.out.println( "NBD Bank account" ); System.out.println( "Name of account holder: " + name); System.out.println( "Account no.: " + accno); System.out.println( "Account type: " + acc_type); System.out.println( "Balance: " + balance); public boolean search(String ac_no) < if (accno.equals(ac_no)) < showAccount(); return ( true ); return ( false );

FGB:

Java

import java.util.*; public class fgb implements CentralBank < String name; String accno; String acc_type; long balance; fgb(String name, String accno, String acc_type, long balance)< this .name = name; this .accno = accno; this .acc_type = acc_type; this .balance = balance; public long getBalance()< return balance; public void withdraw( long amount)< if (balance >= amount) < balance = balance - amount; System.out.println( "Balance after withdrawal: " + balance); System.out.println( "Your balance is less than " + amount + "\tTransaction failed. " ); public void deposit( long amount)< balance = balance + amount; public void showAccount()< System.out.println( "Name of account holder: " + name); System.out.println( "Account no.: " + accno); System.out.println( "Account type: " + acc_type); System.out.println( "Balance: " + balance); public boolean search(String ac_no) < if (accno.equals(ac_no)) < showAccount(); return ( true ); return ( false );

Implementing BankDriver class for creating the objects of subclasses and invoking their methods

Java

import java.util.*; public class BankDriver < public static CentralBank createAccount(ArrayList C) int choice; String name, accNo, acc_type; long balance; boolean found; CentralBank cus1; System.out.println( "Enter ur Bank" ); System.out.println( "1.UNB 2.SGB 3. FGB" ); Scanner sc = new Scanner(System.in); choice = sc.nextInt(); System.out.print( "Enter Name: " ); name = sc.next(); System.out.print( "Enter Account No: " ); accNo = sc.next(); System.out.print( "Enter Account type: " ); acc_type = sc.next(); System.out.print( "Enter Balance: " ); balance = sc.nextLong(); found = false ; for ( int i = 0 ; i < C.size(); i++) < found = C.get(i).search(accNo); System.out.println( "Account with entered accNo already exists." ); switch (choice)< case 1 : if (balance < 1000 ) System.out.println( "Minimum balance is 1000. Please make sure your minimum balance is 1000" ); cus1 = new unb(name, accNo, acc_type, balance); System.out.println( "Account created" ); return cus1; case 2 : if (balance < 2000 ) System.out.println( "Minimum balance is 2000. Please make sure your minimum balance is 20000" ); cus1 = new nbd(name, accNo, acc_type, balance); System.out.println( "Account created in nbd" ); return cus1; case 3 : if (balance < 3000 ) System.out.println( "Minimum balance is 3000. Please make sure your minimum balance is 5000" ); cus1 = new fgb(name, accNo, acc_type, balance); System.out.println( "Account created" ); return cus1; default : System.out.println( "Wrong Choice" ); return null ; public static void main(String args[])< Scanner sc = new Scanner(System.in); ArrayList C = new ArrayList<>(); System.out.println( "No accounts found. Please Create one" ); CentralBank cus1 = createAccount(C); if (cus1 != null ) < System.out.println( "\n #Banking System Application#" );

System.out.println( " 1.Create an account \n2. Display all account details \n 3. Search by Account number\n 4. Deposit the amount \n 5. Withdraw the amount \n 6. Remove account\n 7.Exit " );

System.out.println( "Enter your choice: " ); ch = sc.nextInt(); case 1 : CentralBank cus = createAccount(C); if (cus != null ) < if (C.isEmpty())< System.out.println( "No accounts found" ); for ( int i = 0 ; i < C.size(); i++) < C.get(i).showAccount(); System.out.print( "Enter account no. you want to search: " ); String ac_no = sc.next(); boolean found = false ; for ( int i = 0 ; i < C.size(); i++) < found = C.get(i).search(ac_no); System.out.println( "Search failed! Account doesn't exist. " ); System.out.print( "Enter Account no. : " ); ac_no = sc.next(); found = false ; for ( int i = 0 ; i < C.size(); i++) < found = C.get(i).search(ac_no); System.out.println( "Enter the amount to deposit" ); long amount = sc.nextLong(); C.get(i).deposit(amount); System.out.println( "Search failed! Account doesn't exist. " ); System.out.print( "Enter Account No : " ); ac_no = sc.next(); found = false ; for ( int i = 0 ; i < C.size(); i++) < found = C.get(i).search(ac_no); System.out.println( "Enter the amount to withdraw" ); long amount = sc.nextLong(); C.get(i).withdraw(amount); System.out.println( "Search failed! Account doesn't exist.!" ); System.out.println( "Enter your acc no: " ); String temp = sc.next(); found = false ; for ( int i = 0 ; i < C.size(); i++) < found = C.get(i).search(temp); System.out.println( "Account deleted successfully" ); System.out.println( "Search failed! Account doesn't exist.!" ); case 7 : break ; default : System.out.println( "Enter the correct Choice" ); while (ch != 7 );

Output:

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