Chp10 10.7

Posted 2020-06-28

《Java语言程序设计》P296

本章是关于对象的思考，主要是在研究面向对象的程序设计时类的设计，作业写得比较杂乱，构造方法时没有严格遵守类的流行设计风格，由于是作业，再加上比较简单，没有添加任何注释。

 

整套程序分为两个类，一个Account类，用于定义Account()及其方法；一个AccountTest类，用于调用Account类中的方法以实现题目要求的功能。

public class Account {
    private static int ACOUNT_NUMBER = 5;
    private int moneyAtAcount = 5000;
    private boolean isLogin = false;
    public void Acount(){
        
    }
    
    public int getMoneyAtAcount(){
        return moneyAtAcount;
    }
    
    public void withdraw(int m){
        moneyAtAcount -= m;
        System.out.println("Withdraw "+m+" succeed, now balance have " + moneyAtAcount);
    }
    
    public void deposite(int n){
        moneyAtAcount += n;
        System.out.println("Deposite "+n+" succeed, now balance have " + moneyAtAcount);
    }
    
    public void login(int p){
        if(p == ACOUNT_NUMBER){
            isLogin = true;
            
        }else
            System.out.println("Wrroy Account");
    }
    
    public boolean getLogin(){
        return isLogin;
    }
    
    public void logout(){
        isLogin = false;
    }
    
}

import java.util.Scanner;

public class AcountTest {
    public static void main(String[] args) {
        Account account = new Account();
        Scanner input = new Scanner(System.in);
        
        
        for (int i=1;i>0;i++) { 
　　　　//人为无限循环，题目要求如此，实现的比较简陋           
            System.out.println("Enter an id:");
            account.login(input.nextInt());
            for (;account.getLogin();) {
　　　　　　　　　//对于printf的编辑格式不是很熟悉，为了图方便，选用一打println来输出选单
                System.out.println("Main menu");
                System.out.println("1:check balance");
                System.out.println("2:withdraw");
                System.out.println("3:deposit");
                System.out.println("4:exit");
                System.out.println("Enter a choice: ");
                    
                int choice = input.nextInt();
                switch(choice){
                case 1: 
                    System.out.println(account.getMoneyAtAcount());
                    break;
                case 2: 
                    System.out.println("Enter an amount to withdraw: ");
                    account.withdraw(input.nextInt());
                    break;
                case 3:
                    System.out.println("Enter an amount to deposit: ");
                    account.deposite(input.nextInt());
                    break;
                case 4:
                    account.logout();
                    break;
                }
            
            }
            
        }
    } 
}

2016-03-24