银行账户类(Accoount)可以为账户存储交易。取款和存款都会产生交易信息。需要记录账户每次交易(Transaction)的信息，包括取钱还是存钱，交易的金额，交易时间和交易之后的余额。系统可以通过账户查询所有的交易次数(最多10次)。

问题一：为了实现此功能需要设计几个类？

答：两个类，Account类和Transaction类。

问题二：请写出你的设计的类的代码(先画UML图在展示代码)。

UML图：

Account类：

Transaction类：

注意： 两者之间为单项关联

代码如下：

Account类中：

public class Account {

//名字

private String name;

//用户id

private int id = 0;

//账户余额

private double balance = 0;

//账户年利率

private static double annuallnterestRate = 0;

//账户创建的日期

private Date dateCreated;

//用于存储账户所有的交易信息

private Transaction[] transactions = new Transaction[size];

//用于记录账户交易信息存储的位置

private int top = 0;

//能够记录账户最大的交易信息数量

private static int size = 10;

//无参创`在这里插入代码片`建账户

public Account() {

dateCreated = new Date();

}

//带特定id和初始余额开通账户

public Account(double annuallnterestRate, int id, double balance,String name) {

this.annuallnterestRate = annuallnterestRate;

this.id = id;

this.balance = balance;

this.name = name;

dateCreated = new Date();

}

//get和set方法

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 static double getAnnuallnterestRate() {

return annuallnterestRate;

}

public static void setAnnuallnterestRate(double annuallnterestRate) {

Account.annuallnterestRate = annuallnterestRate;

}

//获取用户创建日期

public Date getDataCreated() {

return dateCreated;

}

//获取月利润

public double getMonthlyInterest() {

return (balance * annuallnterestRate / 12) / 100;

}

//取钱

public void withDraw(double amount) {

balance = balance - amount;

if(top

transactions[top++] = new Transaction('W',amount,balance);

}else{

//如果超过了数组存储的最大容量，则删除第一个账单，后面的账单依次往前移，新帐单存在最后一个位置

for(int i = 0;i

transactions[i] = transactions[i+1];

transactions[size-1] = new Transaction('W',amount,balance);

}

}

}

//存钱

public void deposit(double amount) {

balance = balance + amount;

if(top

transactions[top++] = new Transaction('D',amount,balance);

}else{

//如果超过了数组存储的最大容量，则删除第一个账单，后面的账单依次往前移，新帐单存在最后一个位置

for(int i = 0;i

transactions[i] = transactions[i+1];

transactions[size-1] = new Transaction('D',amount,balance);

}

}

}

//输出用户信息及最近的交易记录

public void output() {

System.out.println("Name：" + name);

System.out.println("Annual interest rate : " + getAnnuallnterestRate());

System.out.println("Balance:" + balance);

System.out.printf("%-40s%-15s%-15s%-15s\n", "Date", "Type", "Amount", "Balance");

for(Transaction transaction:transactions){

if(transaction!=null){

transaction.print();

}

}

}

}

Transaction类中：

public class Transaction {

private Date tradTime;

private char tradType;

private double tradAmount;

private double balance;

Transaction(char tradType, double tradAmount, double balance) {

tradTime = new Date();

this.tradType = tradType;

this.tradAmount = tradAmount;

this.balance = balance;

}

public Date getTradTime() {

return tradTime;

}

public char getTradType() {

return tradType;

}

public double getTradAmount() {

return tradAmount;

}

public double getBalance() {

return balance;

}

public String toString() {

return getTradTime() + "\t" + getTradType() + "\t\t" + getTradAmount() + "\t" + balance;

}

public void print(){

System.out.printf("%-40s%-15s%-15s%-15s\n", getTradTime(),

getTradType(), getTradAmount(), getBalance());

}

}

Test(测试)类

public class Test {

public static void main(String[] args) {

Account a1 = new Account(1.5,1122,1000,"George");

a1.setAnnuallnterestRate(5.5);

a1.deposit(30);

a1.deposit(40);

a1.deposit(50);

a1.withDraw(5);

a1.withDraw(4);

a1.withDraw(2);

a1.output();

}

}

运行截图如下：

(未对代码进行精简，部分位置会显得冗余了，请谅解)

本文地址：https://blog.csdn.net/qq_51868285/article/details/110212598

如您对本文有疑问或者有任何想说的，请点击进行留言回复，万千网友为您解惑！