实验：继承&super

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package com.atguigu.exer2;

public class Account {
	private int id;//账号
	private double balance;//余额
	private double annualInterestRate;//年利率
	
	public Account(int id, double balance, double annualInterestRate) {
		super();
		this.id = id;
		this.balance = balance;
		this.annualInterestRate = annualInterestRate;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public double getBalance() {
		return balance;
	}

	public void setBalance(double balance) {
		this.balance = balance;
	}

	public double getAnnualInterestRate() {
		return annualInterestRate;
	}

	public void setAnnualInterestRate(double annualInterestRate) {
		this.annualInterestRate = annualInterestRate;
	}
	//返回月利率
	public double getMonthlyInterest(){	
		return annualInterestRate / 12;
	}
	//取钱
	public void withdraw (double amount){
		if(balance >= amount){
			balance -= amount;
			return;
		}
		System.out.println("余额不足");
	}
	//存钱
	public void deposit (double amount){
		if(amount > 0){
			balance += amount;
		}
	}
}

package com.atguigu.exer2;

public class CheckAccount extends Account {

	private double overdraft;// 可透支限额

	public CheckAccount(int id, double balance, double annualInterestRate, double overdraft) {
		super(id, balance, annualInterestRate);
		this.overdraft = overdraft;
	}

	public double getOverdraft() {
		return overdraft;
	}

	public void setOverdraft(double overdraft) {
		this.overdraft = overdraft;
	}

	@Override
	public void withdraw(double amount) {
		if (getBalance() >= amount) {// 余额就足够消费
//			getBalance() -= amount;
			// 方式一：
//			setBalance(getBalance() - amount); 
			// 方式二：
			super.withdraw(amount);
		} else if (overdraft >= amount - getBalance()) {// 透支额度+余额足够消费

			overdraft -= (amount - getBalance());

//			setBalance(0);
			// 或
			super.withdraw(getBalance());

		} else {
			System.out.println("超过可透支限额！");
		}
	}
}