1、介绍

• CustomerView：主模块，负责菜单的显示和处理用户操作。
• CustomerList：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：实体对象，用来封装客户信息。
• CMUtility：工具集。

2、代码

Customer

package com.xianhuii.p2.bean;

/**
 * Customer为实体对象，用来封装客户信息
 */
public class Customer {
    private String name;
    private char gender;
    private int age;
    private String phone;
    private String email;

    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;
    }
}

CustomerList

package com.xianhuii.p2.service;

import com.xianhuii.p2.bean.Customer;

/**
 * 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。
 */
public class CustomerList {
    private Customer[] customers;   // 存放多个客户的数组
    private int total;      // 记录以保存的客户的个数

    /**
     * 用来初始化customer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;
        return true;
    }

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

    /**
     * 删除指定索引位置上的客户
     * @param index
     * @return true：删除成功；false：删除失败
     */
    public boolean deleteCustomer(int index) {
        if (index >= total || index < 0) {
            return false;
        }
        for (int i = index; i < total - 1; i++) {
            customers[i] = customers[i + 1];
        }
        customers[--total] = null;
        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；如果没有找到，则返回null
     */
    public Customer getCustomer(int index) {
        if (index >= total || index < 0) {
            return null;
        }
        return customers[index];
    }

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

CustomerView

package com.xianhuii.p2.ui;

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

/**
 * 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("张三", '男', 18, "18888888888", "zs@qq.com");
        customerList.addCustomer(customer);
    }

    /**
     * 显示客“客户信息管理软件”界面的方法
     */
    public void enterMainMenu() {
        boolean loopFlag = true;
        do {
            System.out.println("\n----------------客户信息管理软件----------------");
            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 key = CMUtility.readMenuSelection();
            System.out.println();
            switch (key) {
                case '1':
                    addNewCustomer();
                    break;
                case '2':
                    modifyCustomer();
                    break;
                case '3':
                    deleteCustomer();
                    break;
                case '4':
                    listAllCustomers();
                    break;
                case '5':
                    System.out.println("确认是否退出（Y/N）：");
                    char isExit = CMUtility.readConfirmSelection();
                    if (isExit == 'Y') {
                        loopFlag = false;
                    }
            }
        } while (loopFlag);
    }

    /**
     * 添加用户的操作
     */
    public 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);
        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("----------------客户目录已满，添加失败！----------------");
        }
    }

    /**
     * 修改用户的操作
     */
    private void modifyCustomer() {
        System.out.println("----------------------修改客户----------------------");
        int id;
        Customer customer;
        for (;;) {
            System.out.print("请选择修改客户编号（-1退出）：");
            int number = CMUtility.readInt();
            if (number == -1) {
                return;
            }
            customer = customerList.getCustomer(number - 1);
            if (customer != null) {
                id = number-1;
                break;
            }
            System.out.println("无法找到指定客户！");
        }
        System.out.print("姓名（" + customer.getName()+"）：");
        String name = CMUtility.readString(10,customer.getName());
        System.out.print("性别（"+customer.getGender()+"）：");
        char gender = CMUtility.readChar(customer.getGender());
        System.out.print("年龄（"+customer.getAge()+"）：");
        int age = CMUtility.readInt();
        System.out.print("电话（"+customer.getPhone()+"）：");
        String phone = CMUtility.readString(13,customer.getPhone());
        System.out.print("邮箱（"+customer.getEmail()+"）：");
        String email = CMUtility.readString(30,customer.getEmail());
        Customer newCustomer = new Customer(name, gender, age, phone, email);
        boolean isSuccess = customerList.replaceCustomer(id, newCustomer);
        if (isSuccess) {
            System.out.println("----------------------修改成功！----------------------");
        } else {
            System.out.println("----------------------修改失败！----------------------");
        }
    }

    /**
     * 删除用户的操作
     */
    private void deleteCustomer() {
        System.out.println("----------------------删除客户----------------------");
        int id;
        Customer customer;
        for (;;) {
            System.out.print("请选择删除客户编号（-1退出）：");
            int number = CMUtility.readInt();
            if (number == -1) {
                return;
            }
            customer = customerList.getCustomer(number - 1);
            if (customer != null) {
                id = number-1;
                break;
            }
            System.out.println("无法找到指定客户！");
        }
        String name = customer.getName();
        char gender = customer.getGender();
        int age = customer.getAge();
        String phone = customer.getPhone();
        String email = customer.getEmail();
        System.out.println("编号\t\t姓名\t\t性别\t\t年龄\t\t电话\t\t\t\t邮箱");
        System.out.println(id+1 + "\t\t" + name + "\t\t" + gender + "\t\t" + age + "\t\t" + phone + "\t\t" + email);
        System.out.println("确认是否删除（Y/N）：");
        char isDelete = CMUtility.readConfirmSelection();
        boolean isSuccess = false;
        if (isDelete == 'Y') {
            isSuccess = customerList.deleteCustomer(id);
        }
        if (isSuccess) {
            System.out.println("----------------------删除成功！----------------------");
        } else {
            System.out.println("----------------------删除失败！----------------------");
        }
    }

    /**
     * 显示用户的操作
     */
    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\t姓名\t\t性别\t\t年龄\t\t电话\t\t\t\t邮箱");
            Customer[] customers = customerList.getAllCustomers();
            for (int i = 0; i < total; i++) {
                String name = customers[i].getName();
                char gender = customers[i].getGender();
                int age = customers[i].getAge();
                String phone = customers[i].getPhone();
                String email = customers[i].getEmail();
                System.out.println(i+1 + "\t\t" + name + "\t\t" + gender + "\t\t" + age + "\t\t" + phone + "\t\t" + email);
            }
        }
        System.out.println("--------------------客户列表完成--------------------");
    }

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

CMUtility

package com.xianhuii.p2.util;

import java.util.Scanner;

public class CMUtility {
    private static Scanner scanner = new Scanner(System.in);

    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;
    }

    public static char readChar() {
        String str = readKeyBoard(1, false);
        return str.charAt(0);
    }

    public static char readChar(char defaultValue) {
        String str = readKeyBoard(1, true);
        return (str.length() == 0) ? defaultValue : str.charAt(0);
    }

    public static int readInt() {
        int n;
        for (; ; ) {
            String str = readKeyBoard(2, false);
            try {
                n = Integer.parseInt(str);
                break;
            } catch (NumberFormatException e) {
                System.out.println("数字输入错误，请重新输入：");
            }
        }
        return n;
    }

    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.println("数字输入错误，请重新输入：");
            }
        }
        return n;
    }

    public static String readString(int limit) {
        return readKeyBoard(limit, false);
    }

    public static String readString(int limit, String defaultValue) {
        String str = readKeyBoard(limit, true);
        return str.equals("") ? defaultValue : str;
    }

    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.println("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;
    }
}

3、运行主界面