class Bank
{
private Account[] account;
private boolean locked;
public Bank()
{
account = new Account[100];
for(int i = 0; i < account.length; i++)
{
account[i] = new Account();
}
locked = false;
}
public void transferMoney(int accountNumber, float amount)
{
while(locked);
locked = true;
float oldBalance = account[accountNumber].getBalance();
float newBalance = oldBalance + amount;
account[accountNumber].setBalance(newBalance);
locked = false;
}
}