java面向对象练习---银行业务模拟（数组+面向对象）

查询账户功能（传入值：账号，账号密码，返回值：空）
a) 业务逻辑：先根据账号判断用户库是否存在该用户，若不存在则打印提示信息：该不存在。否则继续判断密码是否正确。若不正确则打印相对应的错误信息。若账号和密码都正确，则将该用户的信息都打印出来，比如：当前账号：xxxx,密码:xxxxxx,余额：xxxx元，用户居住地址：xxxxxxxxxxxxx，当前账户的开户行：xxxxxxxxxx.
d) 界面类：在执行该入口程序时，就打印银行业务选择菜单：比如：
i.
ii. 然后就开始处理各种输入操作，直到业务处理完成!

答案：
1、地址类

class Address{
private String country;//国家
private String province;//省份
private String street;//街道
private String id;//门排号

        public Address(){}
public Address(String country,String province,String street,String id){
    this.country = country;
    this.province = province;
    this.street = street;
    this.id = id;
}

public void setCountry(String country){
    this.country = country;
}

public String getCountry(){
    return this.country;
}

public void setProvince(String province){
    this.province = province;
}

public String getProvince(){
    return this.province;
}

public void setStreet(String street){
    this.street = street;
}

public String getStreet(){
    return this.street;
}

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

public String getId(){
    return this.id;
}
    

}

        2、用户类
    

class User{
private int code;//账号
private String name;//姓名
private int password;//密码
private Address address;//地址
private double money;//存款余额
private Date date;//注册时间
private String openBankName;//开户行

        public User(){}

public User(int code,String name,int password,Address address,double money,Date date,String openBankName){
    this.code = code;
    this.name = name;
    this.password = password;
    this.address = address;
    this.money = money;
    this.date = date;
    this.openBankName = openBankName;
}

public void setCode(int code){
    this.code = code;
}

public int getCode(){
    return this.code;
}

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

public String getName(){
    return this.name;
}

public void setPassword(int password){
    this.password = password;
}

public int getPassword(){
    return this.password;
}

public void setAddress(Address address){
    this.address = address;
}

public Address getAddress(){
    return this.address;
}

public void  setMoney(double money){
    this.money = money;
}

public double getMoney(){
    return this.money;
}

public void setDate(Date date){
    this.date = date;
}

public Date getDate(){
    return this.date;
}

public void setOpenBankName(String openBankName){
    this.openBankName = openBankName;
}

public String getOpenBankName(){
    return this.openBankName;
}
    

}

3、银行类

class Bank{
private String bankName ;

        static User[] users =  new User[10];

public Bank(){}

public Bank(String bankName){
    this.bankName = bankName;
}

public void setBankName(String bankName){
    this.bankName = bankName;
}

public String getBankName(){
    return this.bankName;
}

/**
    检查用户是否存在
*/
public boolean checkUser(int code){
    for (User u : users){
        if (u != null){
            if (u.getCode() == code){
                return true;
            }
        }
    }
    return false;
}

/**
    检查用户是否已满
*/
public boolean isFullUser(){
    for (User user : users){
        if (user == null){
            return false;
        }
    }
    return true;
}

/**
    检查用户和密码是否正确
*/
public boolean checkUserAndPassword(int userCode, int password){
    if (checkUser(userCode)){
        for (User u : users){
            if (u.getCode() == userCode){
                if (u.getPassword() == password){
                    return true;
                }
            }
        }
    }
    return false;
}

/**
    检查钱是否够
*/
public boolean checkMoney(int userCode,double money){
    for (User u : users){
        if (u.getCode() == userCode){
            if (u.getMoney() >= money){
                return true;
            }else{
                break;
            }
        }
    }
    return false;
}

/**
    添加用户的方法
*/
public int  addUser(User user){
    if (checkUser(user.getCode())){
        return 2; 
    }else if (isFullUser()){
        return 3;
    }else{
        for (int i = 0;i < users.length ; i++){
            if (users[i] == null){
                users[i] = user;
                return 1;
    

// break;
}
}
}
return 1;
}

        /**
    存钱方法
*/
public boolean saveMoney(int userCode,double money){
    if (!checkUser(userCode)){
        return false;
    }else{
        for (User u : users){
            if (u.getCode() == userCode){
                u.setMoney(u.getMoney() + money);
            }
        }
    }
    return true;
}

/**
    取钱方法
*/
public int takeMoney(int userCode,int password,double takeMoney){
    if (!checkUser(userCode)){
        return 1;
    }else if (!checkUserAndPassword(userCode,password)){
        return 2;
    }else if (!checkMoney(userCode,takeMoney)){
        return 3;
    }else{
        for (User u : users){
            if (u.getCode() == userCode){
                u.setMoney(u.getMoney() - takeMoney);
                break;
            }
        }
    }
    return 0;
}

/**
    转账方法
*/
public int transferMoney(int outCode,int inCode,int outpassword,double outMoney){
    if (!checkUser(outCode) && checkUser(inCode)){
        return 1;
    }else if (!checkUserAndPassword(outCode,outpassword)){
        return 2;
    }else if (!checkMoney(outCode,outMoney)){
        return 3;
    }else{
        saveMoney(inCode,outMoney);
        takeMoney(outCode,outpassword,outMoney);
    }
    return 0;
}

/**
    查询账户
*/
public void selectUser(int userCode,int password){
    if (!checkUser(userCode)){
        System.out.println("该用户不存在!");
    }else if (!checkUserAndPassword(userCode,password)){
        System.out.println("密码错误!");
    }else{
        User u = null;
        Address address = null;
        for (User user : users){
            if (user.getCode() == userCode){
                u = user;
                address = u.getAddress();
                break;
            }
        }   
        System.out.println("当前账户为:\t" + u.getName() + "\n账号为：" + userCode 
            + "\n密码：" + password  + "\n余额：" + u.getMoney() 
            + "\n用户当前居住地址：\t" +  address.getCountry() + address.getProvince() + "市" 
            + address.getStreet() + address.getId() + "号!");
    }
}
    

}

4、页面模拟类

class Page{
public static void welcomePage(){
System.out.println("**");
System.out.println(" 中国工商银行 ");
System.out.println(" 账户管理系统 ");
System.out.println(" V1.0 ");
System.out.println("**");
System.out.println(" 1.开户 ");
System.out.println(" 2.存钱 ");
System.out.println(" 3.取钱 ");
System.out.println(" 4.转账 ");
System.out.println(" 5.查询 ");
System.out.println(" 6.bye! ");
System.out.println("**");
}
}

5、具体的测试类
import java.util.Date;
import java.util.Scanner;
public class Demo{
private static Scanner sc = new Scanner(System.in);
private static Bank bank = new Bank("中国工商银行沙河支行");
public static void main(String[] args){
Page.welcomePage();
System.out.print("请输入业务编号：");
int num = sc.nextInt();
if (num == 1){
System.out.print("请输入账户号：");
int code = sc.nextInt();
System.out.print("\n请输入用户名：");
String name = sc.next();
System.out.print("\n请输入密码：");
int password = sc.nextInt();
System.out.print("\n请输入输入居住的地址，首先输入国家：");
String country = sc.next();
System.out.print("\n请输入省份：");
String province = sc.next();
System.out.print("\n请输入街道：");
String street = sc.next();
System.out.print("\n请输入门牌号：");
String id = sc.next();
System.out.print("\n请输入您的账户的初始余额：");
double money = sc.nextDouble();

                Address address = new Address(country,province,street,id);
        User user = new User(code,name,password,address,money,new Date(),bank.getBankName());
        int n = bank.addUser(user);
        if (n == 2){
            System.out.println("对不起，您输入的账户已存在，无法开户，请带好证件到营业厅窗口办理!");
        }else if (n == 3){
            System.out.println("对不起，当前银行的用户数已满，请到其他银行办理业务!");
        }else if (n == 1){
            System.out.println("恭喜你，开户成功下面是您的开户信息：");
            bank.selectUser(code,password);
        }
    }else if (num == 2){

    }else if (num == 3){

    }else if (num == 4){

    }else if (num == 5){

    }else if (num == 6){
        System.out.println("Bye~~");
        System.exit(0);
    }
}
    

}

原文：http://blog.51cto.com/lyinginsun/2154804