客户管理信息软件

参考视频（p248-p259）

CustomerView 主模块，菜单显示

package com.atguigu.p2.ui;

import com.atguigu.p2.bean.Customer;
import com.atguigu.p2.service.CustomerList;
import com.atguigu.p2.util.CMUtility;

/**
 * @program: project12
 * @description: 主模块，菜单显示，处理用户操作
 * @author: kkx
 * @create: 2021-12-28 17:12
 **/
public class CustomerView {
    private CustomerList customerList = new CustomerList(10);

    public CustomerView(){
        //默认有一个
        Customer customer = new Customer("王涛", '男', 23, "13212341234", "wt@gmail.com");
        customerList.addCustomer(customer);
    }
    /**
    * @Description: 显示《客户信息管理软件》界面的方法
    * @Author: kkx
    * @Date: 2022/1/4
    * @Param: []
    * @return: void
    */
    public void enterMainMenu(){
        boolean isFlag = true;

        while (isFlag){
            System.out.println("\n-----------------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("                   3 删 除 客 户");
            System.out.println("                   4 客 户 列 表");
            System.out.println("                   5 退       出\n");
            System.out.print("                   请选择(1-5)：");

            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;
                    }
                    break;
            }
        }
    }

    /**
    * @Description: 添加客户的操作
    * @Author: kkx
    * @Date: 2022/1/4
    * @Param: []
    * @return: void
    */
    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);

        //包装
        Customer customer = new Customer(name, gender, age, phone, email);
        boolean isSuccess = customerList.addCustomer(customer);
        if (isSuccess){
            System.out.println("---------------------添加完成---------------------");
        }else {
            System.out.println("-------------------客户目录已满，添加失败---------------");
        }
    }

    /**
    * @Description: 修改客户的操作
    * @Author: kkx
    * @Date: 2022/1/5
    * @Param: []
    * @return: void
    */
    private void modifyCustomer(){
        System.out.println("---------------------修改客户---------------------");
        //这两个放外面是因为后面在循环外要调用
        int number;
        Customer cust;

        for (;;){
            System.out.print("请选择待修改客户编号(-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 {
                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());

        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 {
            //没有机会执行
            System.out.println("---------------------修改失败---------------------");
        }
    }

    /**
    * @Description: 删除客户的操作
    * @Author: kkx
    * @Date: 2022/1/5
    * @Param: []
    * @return: void
    */
    private void deleteCustomer(){
        System.out.println("---------------------删除客户---------------------");
        int number;

        for (;;){
            System.out.print("请选择待删除客户编号(-1退出)：");
            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 {
                break;
            }
        }
        //找到了指定的客户，开始修改
        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 {
                //没有机会执行
                System.out.println("---------------------删除失败---------------------");
            }
        }else {
            return;
        }
    }

    /**
    * @Description: 显示客户列表的操作
    * @Author: kkx
    * @Date: 2022/1/4
    * @Param: []
    * @return: void
    */
    private void listAllCustomers(){
        System.out.println("---------------------------客户列表---------------------------\n");
        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电话\t\t邮箱");
            Customer[] custs = customerList.getAllCustomers();
            for (int i = 0; i < custs.length; i++) {
                Customer cust = custs[i];
                System.out.println((i + 1) + "\t" + "\t" + cust.getName() +
                        "\t" + cust.getGender() + "\t" + "\t" + cust.getAge() +
                        "\t" + "\t" + cust.getPhone() + "\t" + cust.getEmail());
            }
        }
        System.out.println("-------------------------客户列表完成-------------------------");
    }

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

Customer管理

package com.atguigu.p2.service;

import com.atguigu.p2.bean.Customer;

/**
 * @program: project12
 * @description: Customer管理
 * @author: kkx
 * @create: 2021-12-28 17:11
 **/
public class CustomerList {
    private Customer[] customers;
    private int total;          //记录存储的客户的个数

    /**
    * @Description: 构造器，用来初始化customers数组
    * @Author: kkx
    * @Date: 2021/12/28
    * @Param: [totalCustomer] 指定customers数组的最大空间
    * @return:
    */
    public CustomerList(int totalCustomer){
        customers = new Customer[totalCustomer];
    }

    /**
    * @Description: 添加指定的客户到数组中
    * @Author: kkx
    * @Date: 2021/12/28
    * @Param: [customer]
    * @return: boolean 是否添加成功
    */
    public boolean addCustomer(Customer customer){
        //小于最大则可以添加
        if (total < customers.length){
            customers[total] = customer;
            total++;
            return true;
        }
        return false;
    }

    /**
    * @Description: 修改指定索引位置上的客户信息
    * @Author: kkx
    * @Date: 2021/12/28
    * @Param: [index, cust]
    * @return: boolean 是否修改成功
    */
    public boolean replaceCustomer(int index, Customer cust){
        if (index < 0 || index >= total){
            return false;
        }
        customers[index] = cust;
        return true;
    }

    /**
    * @Description: 删除指定索引位置上的客户信息
    * @Author: kkx
    * @Date: 2022/1/4
    * @Param: [index]
    * @return: boolean 是否删除成功
    */
    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];
        }
        //这里先把最后那个指向null，total再--
        customers[--total] = null;
        return true;
    }

    /**
    * @Description: 获取所有客户的客户信息
    * @Author: kkx
    * @Date: 2022/1/4
    * @Param: []
    * @return: com.atguigu.p2.bean.Customer[]
    */
    public Customer[] getAllCustomers(){
        Customer[] custs = new Customer[total];
        for (int i = 0; i < total; i++) {
            custs[i] = customers[i];
        }
        return custs;
    }

    /**
    * @Description: 返回指定索引位置上的Customer
    * @Author: kkx
    * @Date: 2022/1/4
    * @Param: [index]
    * @return: 如果找到元素，则返回，如果没有找到，返回null
    */
    public Customer getCustomer(int index){
        if (index < 0 || index >= total){
            return null;
        }
        return customers[index];
    }

    /**
    * @Description: 获取存储的客户的数量
    * @Author: kkx
    * @Date: 2022/1/4
    * @Param: []
    * @return: int
    */
    public int getTotal(){
        return total;
    }
}

Customer类

package com.atguigu.p2.bean;

/**
 * @program: project12
 * @description: Customer类
 * @author: kkx
 * @create: 2021-12-28 17:08
 **/
public class Customer {
    private String name;        // 姓名
    private char gender;        // 性别
    private int age;            // 年龄
    private String phone;       // 电话
    private String email;       // 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;
    }
}

CMUtility工具类

package com.atguigu.p2.util;

/**
 * @program: project12
 * @description: CMUtility工具类
 * @author: kkx
 * @create: 2021-12-28 17:14
 **/

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 Scanner scanner = new Scanner(System.in);
    /**
     用于界面菜单的选择。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。
     */
    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() < 1 || 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;
    }
}