Question

how to create BANKACCOUNT program using Arrays in JAVA.

Answer 1

import java.util.HashMap;

import java.util.Scanner;

// main class

public class BankAccount {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

HashMap<Integer, Account> accountMap = new HashMap<Integer, Account>();

//Options

while(true) {

System.out.println("Enter the option for the operation you need:");

System.out.println("****************************************************");

System.out.println("[ Options: ne - New Account de - Delete Account ]");

System.out.println("[ dp - Deposit wi - Withdraw ]");

System.out.println("[ se - Select Account ex - Quit ]");

System.out.println("****************************************************");

System.out.print("> "); //indicator for user input

String choice = input.next();

System.out.println("Your choice: " + choice);

if(choice.equals("ne")) {

Integer newAccountNumber;

Double initialBalance;

Account newAccount;

// Array for account and balance

System.out.print("Insert account number: ");

newAccountNumber = input.nextInt(); //-- Input nr for array insertion

System.out.print("Enter initial balance: ");

initialBalance=input.nextDouble(); //-- Input nr for array insertion

newAccount = new Account(newAccountNumber, initialBalance);

accountMap.put(newAccountNumber, newAccount);

System.out.println("New Account " + newAccountNumber + " created with balance: " + initialBalance);

}

//select account

else if(choice.equals("se")) {

System.out.println("Enter number of account to be selected: ");

Integer accountToGetNumber = input.nextInt();

Account returnedAccount = accountMap.get(accountToGetNumber);

if (returnedAccount != null)

{

System.out.println("Account open. Current balance: " + returnedAccount.getBalance());

}

else

{

//user input for account nr from array

System.out.println("Account does not exist.");

}

}

//close account

else if(choice.equals("de"))

{

System.out.println("Enter number of account to be selected: ");

Integer accountToDeleteNumber = input.nextInt();

Account removedAccount = accountMap.remove(accountToDeleteNumber);

if (removedAccount != null)

{

System.out.println("Account " + removedAccount.getAccountNumber() + " has been closed with balance: " + removedAccount.getBalance());

}

else

{

//user input for account nr from array

System.out.println("Account does not exist.");

}

}

// deposit

else if(choice.equals("dp")) {

System.out.println("Enter number of account to deposit: ");

Integer accountToDeposit = input.nextInt();

System.out.print("Enter amount to deposit: ");

double amount = input.nextDouble();

if(amount <= 0){

System.out.println("You must deposit an amount greater than 0.");

} else {

accountMap.get(accountToDeposit).deposit(amount);

System.out.println("You have deposited " + (amount));

System.out.println("Current balance " + accountMap.get(accountToDeposit).getBalance());

}

}

// withdrawal

else if(choice.equals("wi")) {

System.out.println("Enter number of account to withdraw: ");

Integer accountToWithdraw = input.nextInt();

System.out.print("Enter amount to withdraw: ");

double amount = input.nextDouble();

if(amount <= 0) {

System.out.println("You must deposit an amount greater than 0.");

} else {

accountMap.get(accountToWithdraw).withdraw(amount);

System.out.println("You have deposited " + (amount));

System.out.println("Current balance " + accountMap.get(accountToWithdraw).getBalance());

}

}

//quit

else if(choice.equals("ex")) {

break;

} else {

System.out.println("Wrong option.");

} //end of if

} //end of loop

input.close();

} //end of main

} //end of class