I'm new to programming. When I compile this program, I get this error
message:
line 3: BankAccount(int) in BankAccount cannot be applied to ()
same error in Line 4.  This one has me stumped. Can someone see
something I'm missing?

public class BankDemo {
 public static void main(String[]  args)  {
   BankAccount alice = new BankAccount(),
               bob = new BankAccount();
   alice.deposit(500);
   bob.deposit(200);
   alice.withdraw(100);
   bob.deposit(300);

   System.out.println("Alice's balance: " + alice.getBalance());
   System.out.println("Bob's balance: " + bob.getBalance());
 }
}
class BankAccount  {
 public BankAccount(int initialBalance)  {
   balance = initialBalance;
 }

 public void deposit(int amount)  {
   balance = balance + amount;
 }

 public void withdraw()  {
   balance = balance - 100;
 }

 public void withdraw(int amount)  {
   balance = balance - amount;
 }

 public int getBalance()  {
   return balance;
 }

 public String toString()  {
   return "BankAccount [balance=" + balance + "]";
 }
 
 private int balance = 0;
}