Thread: How To add my own Exceptions

hi i was wondering on how to add my own exception to the withdrawl method.

import java.util.ArrayList;
import java.util.List;
 
 
 
public class BankManager implements _BankManager {
 
	Storage store;
 
	public BankManager() {
		store = new ArrayListStorage();
 
	}
 
	public BankAccountOutputVO ViewAccountSummary(String accountNumber)
			throws AccountDoesNotExist {
		BankAccountOutputVO bao = null;
		int accountNum = Integer.parseInt(accountNumber);
 
		for (BankAccount acc : store.getList()) {
 
			if (acc == null) {
				//System.out.println("Account Does not exists");
				throw new AccountDoesNotExist();
 
			}
 
			if (acc.getAccountNumber() == accountNum) {
				store.getList();
				bao = BankAccount.convertBAO(acc);
			} else {
				throw new AccountDoesNotExist();
			}
		}
		return bao;
	}
 
	public BankAccountOutputVO closeAcount(String accountNumber) {
		BankAccountOutputVO bao = null;
 
		int accountNum = Integer.parseInt(accountNumber);
 
		for (BankAccount acc : store.getList()) {
 
			if (acc == null) {
				// throw new AccountDoesNotExist();
			}
 
			if (acc.getAccountNumber() == accountNum) {
				if (acc.balance == 0) {
					store.getList().remove(acc);
					bao = BankAccount.convertBAO(acc);
				} else if (acc.getAccountNumber() == accountNum) {
					bao = BankAccount.convertBAO(acc);
 
					break;
				}
			}
		}
		return bao;
	}
 
	public BankAccountOutputVO createNewCurrentAccount(String name,
			double amount, double overdraftLimit) {
		BankAccountOutputVO bao = null;
		BankAccount acc = new CurrentAccount(name, amount, overdraftLimit);
		store.getList().add(acc);
		bao = BankAccount.convertBAO(acc);
 
		return bao;
 
	}
 
	public BankAccountOutputVO createNewSavingsAccount(String name,
			double amount) {
 
		BankAccountOutputVO bao = null;
		BankAccount acc = new SavingAccount(name, amount, amount);
		store.getList().add(acc);
		bao = BankAccount.convertBAO(acc);
 
		return bao;
	}
 
	public List<BankAccountOutputVO> listAllAccounts() {
 
		ArrayList<BankAccountOutputVO> bao = new ArrayList<BankAccountOutputVO>();
 
		for (BankAccount acc : store.getList()) {
			bao.add(BankAccount.convertBAO(acc));
		}
 
		return bao;
	}
 
	public BankAccountOutputVO makeDeposit(String accountNumber, double amount) throws AccountDoesNotExist {
 
		BankAccountOutputVO bao = null;
 
		int accountNum = Integer.parseInt(accountNumber);
 
		for (BankAccount acc : store.getList()) {
			if (acc.getAccountNumber() == accountNum) {
				acc.setdeposit(amount);
				store.deposit(acc);
				bao = BankAccount.convertBAO(acc);
			}
			else{
				throw new AccountDoesNotExist();
			}
 
 
		}
		return bao;
 
	}
 
	public BankAccountOutputVO makeWithdrawal(String accountNumber,
			double amount) {
 
		BankAccountOutputVO bao = null;
 
		int accountNum = Integer.parseInt(accountNumber);
 
		for (BankAccount acc : store.getList()) {
			if (acc.getAccountNumber() == accountNum) {
				if ((acc.getAccountType().equals("Saving Account"))
						&& (acc.balance >= amount)) {
 
					acc.setwithdrawl(amount);
					store.withdraw(acc);
					bao = BankAccount.convertBAO(acc);
					break;
				} else if ((acc.getAccountType().equals("Current Account"))
						&& ((acc.balance + acc.overdraftLimit) >= amount)) {
					acc.setwithdrawl(amount);
					store.withdraw(acc);
					bao = BankAccount.convertBAO(acc);
					break;
				} else {
					bao = BankAccount.convertBAO(acc);
					break;
				}
 
			}
 
			if (acc == null) {
				System.out.println("Account Does not avalible");
				throw new NullPointerException();
 
			}
		}
 
		return bao;
	}
}
 
/highlight
 
highlight=java
 
class MakeWithdrawalAction implements _DisplayAction
{
 
	public void execute(UserInputVO input, _BankManager bank, _DisplayManager dm) 
	{
 
		BankAccountOutputVO output = null;
 
		output = bank.makeWithdrawal(input
				.getAccountNumber(), input.getAmount());
 
		dm.AccountChange(output.getAccountNumber(), output.getName(), output.getBalance(),
				output.getOverdraft());
	}
}