Java-Project-02

逃离我推掉我的手 2021-12-01 18:18 180阅读 0赞

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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();
        }
    
    }

转载于:https://www.cnblogs.com/LXL616/p/10891829.html

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