Java-Project-02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

package com.atguigu.p2.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 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;
    }
}

 

 

 

package com.atguigu.p2.bean;

/**
 * 
 * @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 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;
    }

    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;
        
    }

}

 

 

 

 

package com.atguigu.p2.service;

import com.atguigu.p2.bean.Customer;

/**
 * 
 * @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、删除和遍历方法， 供CustomerView调用*/
public class CustomerList {
    private Customer[] customers;// 用来保存客户对象的数组
    private int total;// 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];
    }
    /**
     * 
     * @Description 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++;
        //或
        customers[total++] = customer;
        return true;
    }
    /**
     * 
     * @Description 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;
        
    }
    /**
     * 删除指定索引位置上的客户
     * @Description 
     * @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--;
        //或
        customers[--total] = null;
        return true;
        
    }
    /**
     * 
     * @Description 获取所有的客户信息
     * @return
     */
    public Customer[] getAllCustomers() {
//        return customers;
        
        Customer[] custs = new Customer[total];
        for(int i = 0;i < total;i++){
            custs[i] = customers[i];
        }
        return custs;
        
    }
    /**
     * 
     * @Description 获取指定索引位置上的客户
     * @param index
     * @return 如果找打了元素，则返回；如果没有找到，则返回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
     * @return
     */
    public int getTotal(){
        return total;
//        return customers.length;//错误的
    }

}

 

 

 

 

package com.atguigu.p2.ui;

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

/**
 * 
 * @Description CustomerView为主模块，负责菜单的显示和处理用户操作
 * @version
 * @date 
 *
 */
public class CustomerView {
    private CustomerList customerList = new CustomerList(10);
    
    
    public CustomerView(){
        Customer customer = new Customer("王涛", '男', 23, "13212341234", "wt@gmail.com");
        customerList.addCustomer(customer);
    }

    /**
     * 显示《客户信息管理软件》界面的方法
     * 
     * @Description*/
    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.println("退出");
                
                System.out.print("确认是否退出(Y/N)：");
                char isExit = CMUtility.readConfirmSelection();
                if(isExit == 'Y'){
                    isFlag = false;
                    
                }
//                break;
            }
            
        }

    }

    /**
     * 添加客户的操作
     * 
     * @Description*/
    private void addNewCustomer() {
//        System.out.println("添加客户的操作");
        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("---------------------添加完成---------------------");
        }else{
            System.out.println("-------------------客户目录已满，添加失败---------------");
        }
    }

    /**
     * 修改客户的操作
     * 
     * @Description*/
    private void modifyCustomer() {
//        System.out.println("修改客户的操作");
        
        System.out.println("---------------------修改客户---------------------");
        Customer cust ;
        int number;
        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{//找到了相应编号的客户
                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());
        
        Customer newCust = new Customer(name, gender, age, phone, email);
        
        boolean isRepalaced = customerList.replaceCustomer(number - 1, newCust);
        if(isRepalaced){
            System.out.println("---------------------修改完成---------------------");
        }else{
            System.out.println("---------------------修改失败---------------------");
        }
    }

    /**
     * 删除客户的操作
     * 
     * @Description*/
    private void deleteCustomer() {
//        System.out.println("删除客户的操作");
        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
        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;
        }
    }

    /**
     * 显示客户列表的操作
     * 
     * @Description*/
    private void listAllCustomers() {
//        System.out.println("显示客户列表的操作");
        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" + cust.getName() + 
                        "\t" + cust.getGender() + "\t" + cust.getAge() + 
                        "\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();
    }

}