java编程 新账户类（Newaccount）（java继承）

可记录多次存取信息

import java.util.ArrayList;import java.util.Date;import java.util.Scanner;//声明public class TestNewaccount //测试类{    public static void main(String[] args)     {        NewAccount account = new NewAccount("Mike",1122,1000);        account.setAnnualInterestRate(1.5/100);        account.deposit(30);        account.deposit(40);        account.deposit(50);        account.withDraw(5);        account.withDraw(4);        account.withDraw(2);        for(int i=0;i=money)        balance-=money;    }    public void deposit(double money)    {        balance+=money;    }}class Transaction//用户交易信息类{    private char type;    private Date date;    private double money;    private double balance;    private String description;    public Transaction(char type,double money,double balance,String description)    {        this.type=type;//交易类型（取款，存款）        date=new Date();//时间        this.money=money;//存取的多少        this.balance=balance;//交易完还剩多少钱        this.description=description;//交易备注    }    public String toString()    {        return "Type:"+type+"  Money:"+money+"  Balance:"+balance+"  Date:"+date+" "+description;    }}class NewAccount extends Account//子类{    private String name;//新增变量    ArrayList transaction=new ArrayList();//ArrayList方法    public NewAccount(String name,int id,double balance)    {        super(id,balance);        this.name=name;    }    public void withDraw(double x)//取钱    {        if(getBalance()>x)        {            setBalance(getBalance()-x);            transaction.add(new Transaction('W',x,getBalance(),""));//往ArrayList方法中加元素        }    }    public void deposit(double x)//存钱    {        setBalance(getBalance()+x);        transaction.add(new Transaction('D',x,getBalance(),""));    }}