class Bank {

  private final int[] accounts;

  /**
   * Constructor.
   *
   * @param accountNum - account number
   * @param baseAmount - base amount
   */
  public Bank(int accountNum, int baseAmount) {
    accounts = new int[accountNum];
    Arrays.fill(accounts, baseAmount);
  }

  /**
   * Transfer amounts from one account to another.
   *
   * @param accountA - source account
   * @param accountB - destination account
   * @param amount   - amount to be transferred
   */
  public synchronized void transfer(int accountA, int accountB, int amount) {<FILL_FUNCTION_BODY>}

  /**
   * Calculates the total balance.
   *
   * @return balance
   */
  public synchronized int getBalance() {
    int balance = 0;
    for (int account : accounts) {
      balance += account;
    }
    return balance;
  }

  /**
   * Get the accountNumber balance.
   *
   * @param accountNumber - accountNumber number
   * @return accounts[accountNumber]
   */
  public synchronized int getBalance(int accountNumber) {
    return accounts[accountNumber];
  }

  /**
   * Get all accounts.
   *
   * @return accounts
   */
  public int[] getAccounts() {
    return accounts;
  }
}

    if (accounts[accountA] >= amount && accountA != accountB) {
      accounts[accountB] += amount;
      accounts[accountA] -= amount;
      if (LOGGER.isDebugEnabled()) {
        LOGGER.debug(
            "Transferred from account: {} to account: {} , amount: {} , bank balance at: {}, source account balance: {}, destination account balance: {}",
            accountA,
            accountB,
            amount,
            getBalance(),
            getBalance(accountA),
            getBalance(accountB));
      }
    }
  
<no_super_class>