Here's a sample main method to test your Bank Account:

public static void main(String[] args)
{
BankAccount account1 = new BankAccount();
account1.deposit(100);
System.out.println(account1.getTransactionCount());
System.out.println("Expected: 1");
BankAccount account2 = new BankAccount(1000);
account2.withdraw(100);
System.out.println(account2.getTransactionCount());
System.out.println("Expected: 1");
BankAccount account3 = new BankAccount();
account3.deposit(1000);
account3.withdraw(100);
account3.deposit(1000);
account3.withdraw(100);
account3.withdraw(100);
System.out.println(account3.getTransactionCount());
System.out.println("Expected: 5");
}