public class BankAccount
{
  private double balance;

  public BankAccount()
  {
    balance = 0.0;
  }
  public BankAccount(double initialAmount) {
    balance = initialAmount;
  }
  public void deposit(double amount)
  {
    balance += amount;
  }
  public double getBalance()
  {
    return balance;
  }
  public void withdraw(double amount) {
    if (balance >= amount) {
      balance -= amount;
    } else {
      throw new IllegalArgumentException("Insufficent funds");
    }
  }
  public String toString()
  {
    return String.format("BankAccount(balance = %.2f)", balance);
  }
}