Java语言程序设计 基础篇 编程练习题 11.8

兴趣使然，最近开始自学java，之前的题做了就删，怪可惜的。

自己一个人闷头写代码也不好，今天开始就把做好的题都贴出来求鞭策吧！

要求：

一个Account类储存账户

一个Transaction类储存交易信息

利用ArrayList储存每一条交易信息

最后输出账户清单，显示账户名字、利率、余额和所有交易。

总结：

要注意保存每次交易后的余额balance，调用类方法时该类是否要转换。

代码写完感觉自己的算法逻辑还不够好，经常需要转一次弯的地方自己要转几次弯才到。

搞定一道题，经验值又UP了www

 

package test.com;

import java.util.Scanner;

public class Test {

    public static void main(String[] args) {
        
        
        Scanner input=new Scanner(System.in);
        
        System.out.println("请依次输入账户名，账户ID，账户余额，年利率");
        String name=input.next();
        int id=input.nextInt();
        double balance=input.nextDouble();
        double rate=input.nextDouble();
        Account test = new Account(name, id, balance, rate);
        while(true){
            System.out.println("输入w取钱，d存钱，其他退出并显示信息：");
            String step1=input.next();
            
            if(step1.equals("w")){
                System.out.println("请输入数额：");
                double amount=input.nextDouble();
                test.setWithdraw(amount);
                
                continue;
            }
            if(step1.equals("d")){
                System.out.println("请输入数额：");
                double amount=input.nextDouble();
                test.setDeposit(amount);
                
                continue;
            }else{
                System.out.println("账户名："+name+"\t年利率："+rate+"%\n");
                test.message();
                break;
            }
        
        }
        
    }

}

package test.com;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;

public class Account {
    private int id=0;//用户ID
    private double balance=100;//收支
    private double annualInterestRate=0;//年利率
    private Date dateCreated;//日期
    private double withdraw=0;//取款
    private double deposit=0;//存款
    private String name;
    
    Scanner input = new Scanner(System.in);
    
    public Account(){
        
    }
    
    
    public Account(int num){
        
    }
    
    public Account(String name,int id,double balance,double annualInterestRate){
            this.setName(name);
            this.setId(id);
            this.setBalance(balance);
            this.setAnnualInterestRate(annualInterestRate);
        }
    
    //创建ArrayList储存含有交易信息的对象
    ArrayList transactions=new ArrayList();
    //打印所有存取款信息
    public void message(){
        for(int i=0;i<transactions.size();i++){
            ((Transaction)transactions.get(i)).message();
            }
    }
    
    
    
    //显示日期
    public  Date getDateCreated(){
        this.dateCreated=new Date();
        SimpleDateFormat ft = new SimpleDateFormat ("E yyyy.MM.dd 'at' hh:mm:ss a zzz");
        System.out.println("Current Date: " + ft.format(dateCreated));
        return null;    
    }

    
//get set 方法
    public double getBalance() {
        return balance;
    }

    public void setBalance(double num) {
        this.balance=num;
    }

    public double getWithdraw() {
        return withdraw ;
    }

    public void setWithdraw(double num) {
        Transaction test=new Transaction('w', num, this.getBalance());
        this.setBalance(test.getBalance());
        transactions.add(test);
        
    }

    public double getDeposit() {
        return deposit;
    }

    public void setDeposit(double num) {
        Transaction test=new Transaction('d', num, this.getBalance());
        this.setBalance(test.getBalance());
        transactions.add(test);
        
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public double getAnnualInterestRate() {
        return annualInterestRate;
    }

    public void setAnnualInterestRate(double annualInterestRate) {
        this.annualInterestRate = annualInterestRate;
    }


    public String getName() {
        return name;
    }


    public void setName(String name) {
        this.name = name;
    }
    
    
}

package test.com;

public class Transaction {
    private char type;//交易类型 w取钱d存钱
    private double amount=0;//交易的数额
    private double balance=0;//余额
    
    public Transaction(char type,double amount,double balance){
        this.setType(type);
        this.setAmount(amount);
        this.setBalance(balance);
        
    }
    //每次存取款的信息
    public void message(){
        Account date=new Account();
        date.getDateCreated();
        if(this.type=='w'){
            System.out.println("取款额为："+this.getAmount());
            System.out.println("账户余额为："+this.getBalance()+"\n");
        }
        if(this.type=='d'){
            System.out.println("存款额为："+this.getAmount());
            System.out.println("账户余额为："+this.getBalance()+"\n");
        }
        
        
    }
//get set 
    public char getType() {
        return type;
    }

    public void setType(char type) {
        this.type = type;
    }

    public double getAmount() {
        return amount;
    }

    public void setAmount(double amount) {
        this.amount = amount;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        if(this.type=='w'){
            this.balance = balance-amount;
        }
        if(this.type=='d'){
            this.balance += balance+amount;
        }
    }
    
    
}