java面向对象（银行存款业务无客户）

import java.util.*;//此为银行存款业务
public class Banking
{
public static void main(String[] args)
{
Account account = new Account(500);
System.out.println("您在当地时间["+new Date()+"]      在账户上存了:"+account.getBalance());
for (long i = -99999569l;i<988567763l ;i++ ){}
account.withdraw(309.98);
System.out.println("您在当地时间["+new Date()+"]      在账户上取了:"+account.getBalance());
for (long i = -99999569l;i<988567763l ;i++ ){}
account.deposit(34);
System.out.println("您在当地时间["+new Date()+"]      在账户上存了:"+account.getBalance());
for (long i = -99999569l;i<988567763l ;i++ ){}
account.withdraw(334.96);
System.out.println("您在当地时间["+new Date()+"]      在账户上取了:"+account.getBalance());
}

}
class  Account
{
private double balance;//账户余额
public Account(double init_balance)
{
balance = init_balance;
}
public double getBalance()
{
return balance;
}
//存钱
public void deposit(double amt)
{
balance += amt;
}
//取钱
public void withdraw(double amt)
{
if (balance>=amt)
{
balance -= amt;
}
else
{
throw new RuntimeException("余额不足");
}
}
}