BankApp.java

import java.util.Scanner;

/**
 * A class to test the BankAccount class.  Uses a menu-driven system to
 * allow the user to interactively test the BankAccount class.
 */
public class BankApp {

    private static Scanner stdin = new Scanner(System.in);

    public static void main(String[] args)  throws IllegalArgumentException {

        Bank bank = new Bank(100);

        BankAccount account = new BankAccount(500.5,50505);
        int choice;
        double amount;
        int accountNumber;
        
        do {
        	choice = getUserChoice();
            switch (choice) {
            case 1:
                amount = getAmount();
                accountNumber = getAccountNumber();
                try {
                    account = new BankAccount(amount, accountNumber);
                    bank.add(account);
                    System.out.println("Account info: " + account + "\n");
                } catch (IllegalArgumentException exception) {
                    System.out.println("\n*****ERROR*****: " + exception.getMessage() + "\n");
                }
                break;

            case 2:
                amount = getAmount();
                try {
                    account.deposit(amount);
                    System.out.println("Account info: " + account + "\n");
                } catch (NullPointerException exception) {
                    System.out.println("\n*****ERROR*****: " + "No account! First find account"
                            + " or create a new account\n");
                } catch (IllegalArgumentException exception) {
                    System.out.println("\n*****ERROR*****: " + exception.getMessage()  + "\n");
                }
                break;

            
           
            //TODO TASK 3: add a InsufficientFunds catch clause below
            case 3:
            	amount = getAmount();
            	try {
            		account.withdraw(amount);
                    System.out.println("Account info: " + account + "\n");
                } catch (IllegalArgumentException exception) {
                    System.out.println("\n*****ERROR*****: " + exception.getMessage()  + "\n");
                } catch (NullPointerException e){
                	System.out.println("The Account does not exist!");
                } catch (InsufficientFundsException e){
                	System.out.println("You can't withdraw more than you have!");
                }
                break;
                
            case 4:
                accountNumber = getAccountNumber();
                BankAccount found = bank.find(accountNumber);
                if (found != null) {
                    account = found;
                    System.out.println("Account info: " + account + "\n");
                } else {
                    System.out.println("\n*****ERROR*****: Bank account " + accountNumber
                            + " not found!\n");
                }
                break;
                
            case 5:
                System.out.print("\n\nThe accounts: \n" + bank + "\n\n");
                break;
            }
         } while (choice != 0);
        System.out.println("\n\nGoodbye!");
    }

    private static int getUserChoice() {
        int choice;
        do {
            choice = -1;
            System.out.println("Menu Options:");
            System.out.println("0) Quit");
            System.out.println("1) Create new account");
            System.out.println("2) Deposit to current account");
            System.out.println("3) Withdraw from current account");
            System.out.println("4) Find account");
            System.out.println("5) Print all accounts");

            System.out.print("Enter your choice (0 - 5): ");
            try {
                choice = Integer.parseInt(stdin.nextLine());
            } catch (NumberFormatException exception) {
            }
            if (choice < 0 || choice > 5)
                System.out.println("Invalid choice");
        } while (choice < 0 || choice > 5);
        return choice;
    }

    private static double getAmount() {
        System.out.print("Enter the amount: $ ");
        double amount = -1;
        boolean valid = false;
        do {
            try {
                amount = Double.parseDouble(stdin.nextLine());
                valid = true;
            } catch (NumberFormatException exception) {
                System.out.println("Make sure you enter a valid double!");
            }
        } while (!valid);
        return amount;
    }

    private static int getAccountNumber() {
        System.out.print("Enter the account number: ");
        int amount = -1;
        boolean valid = false;
        do {
            try {
                amount = Integer.parseInt(stdin.nextLine());
                valid = true;
            } catch (NumberFormatException exception) {
                System.out.println("Make sure you enter a valid integer!");
            }
        } while (!valid);
        return amount;
    }
}