public class BankAccount { 
    private double balance;

    public BankAccount() {
	this.balance = 0.0;
    }
    public BankAccount(double initialBalance) {
	this.balance = initialBalance;
    }
    public void deposit(double amount) {
	this.balance = this.balance + amount;
    }
    public void withdraw(double amount) {
	balance = balance - amount;
    } 	
    public double getBalance() {
	return balance;
    }
    public String toString() {
	return "BankAccount[balance = " + balance + "]";
    }
}