课后作业银行ATM系统模拟参考答案

/*Account类：表示银行账户*///创建包：//package com.mybank.domain;//定义类的时候,要注意访问限制符的使用.public class  Account{protected double balance;//表示余额protected Account(double initBalance)//构造器，来初始化成员变量.{this.balance=initBalance; //开户.}public double getBalance()//获取余额.{//想获得balance的值，需要使用return balance;}public boolean deposit(double amt)//存款,amt:存款金额{balance=balance+amt;  return true;}public boolean withdraw(double amt)//取款amt:取款金额//增加业务规则：取款金额和余额. 保证余额〉=取款金额.{boolean result=false;//假设操作失败.if(balance>=amt){balance=balance-amt;result=true;//操作成功.}return result;}}/*类定义完成.*/

/**建立Bank类:属性：customers:Customer[]numberOfCustomers:int构造器：Bank方法：addCustomer(x:String,m:String)getNumOfCustomers():intgetCustomer(index:int):Customer达到以下输出效果Customer[1]is 李逵Customer[2]is 宋江Customer[3]is 燕青customer[4]is 鲁智深*/class Bank {private Customer[]customers;//Customer类型的对象数组 private int numberOfCustomers;//记录下一个customers数组索引的一个整数.public Bank(){//代码为空.至少长度为5来初始化customers数组customers=new Customer[5];numberOfCustomers=0;}public void addCustomer(String x,String m)//参数为姓x、名m{customers[numberOfCustomers]=new Customer(x,m);//构造一个新的Customer对象numberOfCustomers++;//指向下一个编号.}public  int getNumOfCustomers(){//获得客户数量.return numberOfCustomers;//返回}public Customer getCustomer(int index){//实现的功能是啥呢？通过索引来检索客户的信息return customers[index];//通过customers数组来返回一个Customer对象}}

/*定义银行客户类*///创建包//package com.mybank.domain;public class Customer{private String xing;//姓private String ming;//名private Account account;//定义Account类型的一个成员变量,表示客户有一个账户//构造器public Customer(String x,String m){xing=x;ming=m;}//方法public String getXing()//获得姓{return xing;}public String getMing()//获得名{return ming;}public Account getAccount()//获得客户的账户方法{return account;//返回账户}public void setAccount(Account acct)//设置客户的账户.{this.account=acct;}}

/*SavingAccount:储蓄账户类.是账户类的子类.*/class SavingAccountextendsAccount{//属性.private double interestRate;//利率.//构造器.对成员变量初始化。public SavingAccount(double initBalance,double interestRate){super(initBalance);//调用父类的构造器. 把父类的构造器给包含过来.this.interestRate=interestRate;}}

/*透支账户类透支账户类是账户类的子类.*/class CheckingAccount extends Account{//属性private double overdraftAmount;//透支金额//构造器.成员变量初始化.public CheckingAccount(double initBalance,double overdraft){super(initBalance);this.overdraftAmount=overdraft;}public CheckingAccount(double initBalance){super(initBalance);}//方法.重写取钱方法，因为透支账户取钱可以透支.public boolean withdraw(double amt){return false;}}

class TestBanking{public static void main(String[] args) {Bank lsBank=new Bank();lsBank.addCustomer("李","逵");//customers[0]=李逵lsBank.addCustomer("宋","江");//customers[1]=宋江lsBank.addCustomer("燕","青");lsBank.addCustomer("鲁","智深");//System.out.println("长度"+lsBank.getNumOfCustomers());//Customer objCust=new Customer();for(int i=0;i<lsBank.getNumOfCustomers();i++){Customer objCust=lsBank.getCustomer(i);System.out.println("Customer["+(i+1)+"]is"+objCust.getXing()+objCust.getMing());}/*Customer objCust=lsBank.getCustomer(1);System.out.println("Customer[1]is"+objCust.getXing()+objCust.getMing());    objCust=lsBank.getCustomer(2);System.out.println("Customer[2]is"+objCust.getXing()+objCust.getMing());objCust=lsBank.getCustomer(3);System.out.println("Customer[3]is"+objCust.getXing()+objCust.getMing());objCust=lsBank.getCustomer(0);System.out.println("Customer[4]is"+objCust.getXing()+objCust.getMing());*/}}