使用Java编写银行账户类（面向对象思考实验）

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<size){
            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<size-1;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<size){
            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<size-1;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