客户信息存储系统

1.软件设计结构

• CustomerView为主模块，负责菜单的显示和处理用户操作
• CustomerList为Customer对象的管理模块，内部用数组管理一组Customer对象，并提供相应的添加、修改、删除、和遍历方法，供CustomerView调用
• Customer为实体对象，用来封装客户信息

2.代码

package bean;

/**
 * @BelongsProject: project02
 * @BelongsPackage: bean
 * @Author: mcc
 * @CreateTime: 2020-07-30 08:02
 * @Description: Customer为实体对象，用来封装客户信息
 */
public class Customer {
    private String name;//客户姓名
    private char gender;//性别
    private int age;//年龄
    private String phone;//电话号码
    private String email;//电子邮箱

    public Customer() {
    }

    public Customer(String name, char gender, int age, String phone, String email) {
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.phone = phone;
        this.email = email;
    }

    public String getName() {
        return name;
    }

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

    public char getGender() {
        return gender;
    }

    public void setGender(char gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

package service;

import bean.Customer;

/**
 * @BelongsProject: project02
 * @BelongsPackage: service
 * @Author: mcc
 * @CreateTime: 2020-07-30 07:56
 * @Description: CustomerList为Customer对象的管理模块，内部用数组管理一组Customer对象，
 * 并提供相应的添加、修改、删除和遍历操作，供CustomerView调用
 */
public class CustomerList {
    private Customer[] customers;//用来保存客户对象的数组
    private int total = 0;//记录已保存客户对象的数量

    /**
     * 用来初始化customers数组的构造器
     *
     * @param totalCustomer：指定数组的长度
     */
    public CustomerList(int totalCustomer) {
        customers = new Customer[totalCustomer];
    }

    /**
     * 将指定的客户添加到数组中
     *
     * @param customer
     * @return true：添加成功 false：添加失败
     */
    public boolean addCustomer(Customer customer) {
        if (total >= customers.length) {
            return false;
        }
        customers[total] = customer;
        total++;
        return true;
    }

    /**
     * 修改指定索引位置的客户信息
     *
     * @param index
     * @param cust
     * @return true：修改成功 false：修改失败
     */
    public boolean replaceCustomer(int index, Customer cust) {
        if (index < 0 || index >= total) {
            return false;
        }
        customers[index] = cust;
        return true;
    }

    /**
     * 删除指定索引位置的客户
     *
     * @param index
     * @return true：删除成功 false：删除失败
     */
    public boolean deleteCustomer(int index) {
        if (index < 0 || index >= total) {
            return false;
        }
        for (int i = index; i < total - 1; i++) {
            customers[i] = customers[i + 1];
        }
        //最后有数据的元素需要置空
        customers[total - 1] = null;
        total--;
        return true;
    }

    /**
     * 获取所有的客户信息
     *
     * @return
     */
    public Customer[] getAllCustomers() {
        Customer[] custs = new Customer[total];
        for (int i = 0; i < total; i++) {
            custs[i] = customers[i];
        }
        return custs;
    }

    /**
     * 获取指定索引位置上的客户
     *
     * @param index
     * @return 如果找到了元素，则返回；反之则返回null
     */
    public Customer getCustomer(int index) {
        if (index < 0 || index >= total) {
            return null;
        }
        return customers[index];
    }

    /**
     * 获取存储的 客户数量
     *
     * @return
     */
    public int getTotal() {
        return total;
    }
}

package ui;

import bean.Customer;
import service.CustomerList;
import util.CMUtility;

/**
 * @BelongsProject: project02
 * @BelongsPackage: ui
 * @Author: mcc
 * @CreateTime: 2020-07-30 08:05
 * @Description: CustomerView为主模块，负责菜单的显示和处理用户操作
 */
public class CustomerView {
    private CustomerList customerList = new CustomerList(10);

    public CustomerView() {
        Customer customer = new Customer("王涛", '男', 23,
                "13212341234", "[email protected]");
        customerList.addCustomer(customer);
    }

    public static void main(String[] args) {
        CustomerView view = new CustomerView();
        view.enterMainMenu();
    }

    /**
     * 显示客户信息管理软件界面
     */
    public void enterMainMenu() {
        boolean isFlag = true;
        while (isFlag) {
            System.out.println("-------------客户信息管理软件------------\n");
            System.out.println("-------------1.添加客户----------------");
            System.out.println("-------------2.修改客户----------------");
            System.out.println("-------------2.删除客户----------------");
            System.out.println("-------------4.显示客户列表-------------");
            System.out.println("-------------5.退出--------------------\n");
            System.out.print("请选择：");
            char menu = CMUtility.readMenuSelection();
            switch (menu) {
                case '1':
                    addNewCustomer();
                    break;
                case '2':
                    modifyCustomer();
                    break;
                case '3':
                    deleteCustomer();
                    break;
                case '4':
                    listAllCustomers();
                    break;
                case '5':
                    System.out.print("确认是否退出（Y/N）:");
                    char isExit = CMUtility.readConfirmSelection();
                    if (isExit == 'Y') {
                        isFlag = false;
                    }
            }
        }
    }

    /**
     * 添加客户
     */
    private void addNewCustomer() {
        System.out.println("------------------添加客户------------------");
        System.out.print("姓名：");
        String name = CMUtility.readString(10);
        System.out.print("性别：");
        char gender = CMUtility.readChar();
        System.out.print("年龄：");
        int age = CMUtility.readInt();
        System.out.print("电话：");
        String phone = CMUtility.readString(13);
        System.out.print("邮箱：");
        String email = CMUtility.readString(30);
        //将上述数据封装到对象中
        Customer customer = new Customer(name, gender, age, phone, email);
        boolean isSuccess = customerList.addCustomer(customer);
        if (isSuccess) {
            System.out.println("------------------添加成功---------------------");
        } else {
            System.out.println("--------------客户目录已漫威，添加失败------------");
        }
    }

    /**
     * 修改客户
     */
    private void modifyCustomer() {
        System.out.println("------------------修改客户------------------");
        Customer cust;
        int number;
        for (; ; ) {
            System.out.print("请选择待修改客户的编号（-1退出）：");
            number = CMUtility.readInt();
            if (number == -1) {
                return;
            }
            cust = customerList.getCustomer(number - 1);
            if (cust == null) {
                System.out.println("无法找到指定客户!");
            } else {//找到了相应的客户
                break;
            }
        }
        //修改客户信息
        System.out.print("姓名(" + cust.getName() + "):");
        String name = CMUtility.readString(10, cust.getName());
        System.out.print("性别(" + cust.getGender() + "):");
        char gender = CMUtility.readChar(cust.getGender());
        System.out.print("年龄(" + cust.getAge() + "):");
        int age = CMUtility.readInt(cust.getAge());
        System.out.print("电话(" + cust.getPhone() + "):");
        String phone = CMUtility.readString(13, cust.getPhone());
        System.out.print("邮箱(" + cust.getEmail() + "):");
        String email = CMUtility.readString(30, cust.getEmail());
        //装入对象中
        Customer newCust = new Customer(name, gender, age, phone, email);
        boolean isReplaced = customerList.replaceCustomer(number - 1, newCust);
        if (isReplaced) {
            System.out.println("------------------修改完成------------------");
        } else {
            System.out.println("------------------修改失败------------------");
        }
    }

    /**
     * 删除客户
     */
    private void deleteCustomer() {
        System.out.println("------------------删除客户------------------");
        System.out.print("选择待删除客户的编号（-1退出）:");
        int number;
        for (; ; ) {
            number = CMUtility.readInt();
            if (number == -1) {
                return;
            }
            Customer customer = customerList.getCustomer(number - 1);
            if (customer == null) {
                System.out.println("无法找到指定客户！");
            } else {//找到客户就跳出for循环，避免for循环嵌套
                break;
            }
        }
        //找到指定客户
        System.out.print("确认是否删除(Y/N):");
        char isDelete = CMUtility.readConfirmSelection();
        if (isDelete == 'Y') {
            boolean deleteSuccess = customerList.deleteCustomer(number - 1);
            if (deleteSuccess) {
                System.out.println("------------------删除完成------------------");
            } else {
                System.out.println("------------------删除失败------------------");
            }
        } else {
            return;
        }
    }

    /**
     * 显示客户列表
     */
    private void listAllCustomers() {
        System.out.println("----------------------客户列表--------------------------");
        int total = customerList.getTotal();
        if (total == 0) {
            System.out.println("没有客户记录！");
        } else {
            System.out.println("编号\t姓名\t性别\t年龄\t\t电话\t\t\t邮箱");
            Customer[] allCustomers = customerList.getAllCustomers();
            for (int i = 0; i < allCustomers.length; i++) {
                Customer cust = allCustomers[i];
                System.out.println((i + 1) + "\t" + cust.getName() + "\t" + cust.getGender() + "\t" +
                        cust.getAge() + "\t" + cust.getPhone() + "\t" + cust.getEmail());
            }
        }

        System.out.println("--------------------客户列表完成-------------------------");

    }
}

package util;


import java.util.*;

/**
 * CMUtility工具类：
 * 将不同的功能封装为方法，就是可以直接通过调用方法使用它的功能，而无需考虑具体的功能实现细节。
 */
public class CMUtility {
    private static final Scanner scanner = new Scanner(System.in);

    /**
     * 用于界面菜单的选择。
     *
     * @return 该方法读取键盘，如果用户键入’1’-’5’中的任意字符，则方法返回。返回值为用户键入字符。
     */
    public static char readMenuSelection() {
        char c;
        for (; ; ) {
            String str = readKeyBoard(1, false);
            c = str.charAt(0);
            if (c != '1' && c != '2' &&
                    c != '3' && c != '4' && c != '5') {
                System.out.print("选择错误，请重新输入：");
            } else break;
        }
        return c;
    }

    /**
     * 从键盘读取一个字符，并将其作为方法的返回值。
     *
     * @return
     */
    public static char readChar() {
        String str = readKeyBoard(1, false);
        return str.charAt(0);
    }

    /**
     * 从键盘读取一个字符，并将其作为方法的返回值。
     * 如果用户不输入字符而直接回车，方法将以defaultValue 作为返回值。
     */
    public static char readChar(char defaultValue) {
        String str = readKeyBoard(1, true);
        return (str.length() == 0) ? defaultValue : str.charAt(0);
    }

    /**
     * 从键盘读取一个长度不超过2位的整数，并将其作为方法的返回值。
     */
    public static int readInt() {
        int n;
        for (; ; ) {
            String str = readKeyBoard(2, false);
            try {
                n = Integer.parseInt(str);
                break;
            } catch (NumberFormatException e) {
                System.out.print("数字输入错误，请重新输入：");
            }
        }
        return n;
    }

    /**
     * 从键盘读取一个长度不超过2位的整数，并将其作为方法的返回值。
     * 如果用户不输入字符而直接回车，方法将以defaultValue 作为返回值。
     */
    public static int readInt(int defaultValue) {
        int n;
        for (; ; ) {
            String str = readKeyBoard(2, true);
            if (str.equals("")) {
                return defaultValue;
            }

            try {
                n = Integer.parseInt(str);
                break;
            } catch (NumberFormatException e) {
                System.out.print("数字输入错误，请重新输入：");
            }
        }
        return n;
    }

    /**
     * 从键盘读取一个长度不超过limit的字符串，并将其作为方法的返回值。
     */
    public static String readString(int limit) {
        return readKeyBoard(limit, false);
    }

    /**
     * 从键盘读取一个长度不超过limit的字符串，并将其作为方法的返回值。
     * 如果用户不输入字符而直接回车，方法将以defaultValue 作为返回值。
     */
    public static String readString(int limit, String defaultValue) {
        String str = readKeyBoard(limit, true);
        return str.equals("") ? defaultValue : str;
    }

    /**
     * 用于确认选择的输入。该方法从键盘读取‘Y’或’N’，并将其作为方法的返回值。
     */
    public static char readConfirmSelection() {
        char c;
        for (; ; ) {
            String str = readKeyBoard(1, false).toUpperCase();
            c = str.charAt(0);
            if (c == 'Y' || c == 'N') {
                break;
            } else {
                System.out.print("选择错误，请重新输入：");
            }
        }
        return c;
    }

    private static String readKeyBoard(int limit, boolean blankReturn) {
        String line = "";

        while (scanner.hasNextLine()) {
            line = scanner.nextLine();
            if (line.length() == 0) {
                if (blankReturn) return line;
                else continue;
            }

            if (line.length() > limit) {
                System.out.print("输入长度（不大于" + limit + "）错误，请重新输入：");
                continue;
            }
            break;
        }

        return line;
    }
}