package cn.edu.bjut.chapter4;

public abstract class Card {
	protected String accountNumber; // 账号
	protected double balance; // 余额

	public Card(String accountNumber, double balance) {
		this.accountNumber = accountNumber;
		this.balance = (balance >= 0 ? balance : 0); 
	}

	public String getAccountNumber() {
		return this.accountNumber;
	}

	public void setAccountNumber(String accountNumber) {
		this.accountNumber = accountNumber;
	}

	public double getBalance() {
		return this.balance;
	}

	public boolean deposit(double money) {
		if (money <= 0) {
			return false; 
		}

		this.balance += money;
		return true;
	}

	public abstract boolean draw(double money); 
}