第10周-银行类-ArrayList

￡神魔★判官ぃ 2022-08-10 03:54 143阅读 0赞

问题及代码：

/*
    *Copyright (c)2015,烟台大学计算机与控制工程学院
    *All rights reserved.
    *文件名称：Account.java
    *作    者：单昕昕
    *完成日期：2015年11月3日
    *版 本 号：v1.0
    *问题描述：建立类，继承类。
    *程序输入：无。
    *程序输出：无。
    */
    import java.util.Scanner;
    import java.text.SimpleDateFormat;
    import java.util.*;
    
    public class Test
    {
        public static void main(String[] args)
        {
            Account account = new Account("George", 1122, 1000.00);
            account.deposit(30);
            account.deposit(40);
            account.deposit(50);
            account.withdraw(5);
            account.withdraw(4);
            account.withdraw(2);
            Account.setRate(0.015);
            System.out.println("Name: " + account.getName());
            System.out.println("Annual interest rate: " + Account.getRate());
            System.out.println("Balance: " + account.getBalance());
            java.util.ArrayList list = account.getTransactions();
            System.out.printf("%-35s%-15s%-15s%-15s\n", "             Date", "Type", "Amount", "Balance");
            for (int i=0; i<list.size(); i++)
            {
                Transaction transaction = (Transaction)(list.get(i));
                System.out.printf("%-35s%-15s%-15s%-15s\n", transaction.getDate(),
                                  transaction.getMethod(), transaction.getAmount(), transaction.getBalance());
            }
        }
    }
    class Account
    {
        private String name;
        private int id;
        private double balance;
        private Date created;
        private java.util.ArrayList transactions = new java.util.ArrayList();
        private static double rate;
    
        public static void setRate(double rate)
        {
            Account.rate = rate;
        }
        public static double getRate()
        {
            return rate;
        }
        public String toString()
        {
            return "Account";
        }
        public Account (String name, int id, double balance)
        {
            this.name = name;
            this.id = id;
            this.balance = balance;
        }
        public void withdraw(double amount)
        {
            balance -= amount;
            transactions.add(new Transaction("Withdraw", amount, balance));
        }
    
        public void deposit(double amount)
        {
            balance += amount;
            transactions.add(new Transaction("Deposit", amount, balance));
        }
        public int getId()
        {
            return this.id;
        }
    
        public double getBalance()
        {
            return balance;
        }
    
        public java.util.ArrayList getTransactions()
        {
            return transactions;
        }
    
        public String getName()
        {
            return name;
        }
    
        public void setId(int id)
        {
            this.id =id;
        }
    
        public void setBalance(double balance)
        {
            this.balance = balance;
        }
    
        public static void setAnnualInterestRate(double annualInterestRate)
        {
            Account.rate = annualInterestRate;
        }
    
        public double getMonthlyInterest()
        {
            return balance * (rate / 1200);
        }
    }
    class Date
    {
        private java.util.Date date ;
        public java.util.Date getDate()
        {
            date = new java.util.Date();
            return date;
        }
    }
    class Transaction
    {
        private String method;
        private double amount;
        private double balance;
        private java.util.Date date;
        boolean leftMoney;
        public String toString()
        {
            return "SavingsAccount";
        }
    
        public java.util.Date getDate()
        {
            return date;
        }
        public Transaction (String method, double amount, double balance)
        {
            this.method = method;
            this.amount = amount;
            this.balance = balance;
            date = new java.util.Date();//这里记得也要写
        }
        public String getMethod()
        {
            return method;
        }
    
        public double getAmount()
        {
            return amount;
        }
    
        public double getBalance()
        {
            return balance;
        }
    }

运行结果：

![Center][]

知识点总结：

ArrayList类。

学习心得：

类和对象我还是有点生，ArrayList还可以整体打包一个自定义的类~

[Center]: /images/20220731/574438c227c64b1dbe80a75454de6a4e.png