java面向對象（銀行存款業務無客戶）

import java.util.*;//此爲銀行存款業務
public class Banking 
{
	public static void main(String[] args) 
	{
		Account account = new Account(500);
		System.out.println("您在當地時間["+new Date()+"]      在賬戶上存了:"+account.getBalance());
		for (long i = -99999569l;i<988567763l ;i++ ){}
		account.withdraw(309.98);
		System.out.println("您在當地時間["+new Date()+"]      在賬戶上取了:"+account.getBalance());
		for (long i = -99999569l;i<988567763l ;i++ ){}
		account.deposit(34);
		System.out.println("您在當地時間["+new Date()+"]      在賬戶上存了:"+account.getBalance());
		for (long i = -99999569l;i<988567763l ;i++ ){}
		account.withdraw(334.96);
		System.out.println("您在當地時間["+new Date()+"]      在賬戶上取了:"+account.getBalance());
	}
	
}
class  Account
	{
		private double balance;//賬戶餘額
		public Account(double init_balance)
		{
			balance = init_balance;
		}
		public double getBalance()
		{
			return balance;
		}
		//存錢
		public void deposit(double amt)
		{
			balance += amt;
		}
		//取錢
		public void withdraw(double amt)
		{
			if (balance>=amt)
			{
				balance -= amt;
			}
			else 
			{
				throw new RuntimeException("餘額不足");
			}
		}
	}