Java基本语法（十）：案例（客户信息管理软件）

第一步

第二步

第三步设计CustomerView为主模块，负责菜单的显示和处理用户操作实现功能 1.CMUtility工具类

package com.wy.demo.util;


import java.util.*;

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.print("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.print("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.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;
    }
}

2.Customer类

package com.wy.demo.bean;


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

    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;
    }

    private String email;//电子邮箱
}

3. CustomerList类

package com.wy.demo.service;

import com.wy.demo.bean.Customer;


public class CustomerList {
    private Customer[] customers;//用来保存客户对象的数组
    private int total = 0;//记录以保存客户对象的数量

    
    public CustomerList(int totalCustomer){
        customers = new Customer[totalCustomer];
    }

    
    public boolean addCustomer(Customer customer){
        if (total >= customers.length){
            return false;
        }
//        customers[total] = customer;
//        total++;
        //或
        customers[total++] = customer;
        return true;
    }

    
    public boolean replaceCustomer(int index,Customer customer){
        if (index < 0 || index >= total){
            return false;
        }

        customers[index] = customer;
        return true;
    }

    
    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;
    }


    
    public Customer[] getAllCustomers(){
        Customer[] custs = new Customer[total];
        for (int i = 0;i < total;i++){
            custs[i] = customers[i];
        }
        return custs;
    }

    
    public Customer getCustomers(int index){
        if (index < 0 || index >= total){
            return null;
        }
        return customers[index];
    }

    
    public int getTotal(){
        return total;
    }
}

4.CustomerView类

package com.wy.demo.ui;

import com.wy.demo.bean.Customer;
import com.wy.demo.service.CustomerList;
import com.wy.demo.util.CMUtility;


public class CustomerView {

    private CustomerList customerList = new CustomerList(10);

    public CustomerView(){
//        Customer customer = new Customer("白科",'男',18,"010-56253825",
//                "abc@email.com");
//        customerList.addCustomer(customer);
    }

    public void enterMainMenu(){
        boolean isFlag = true;
        while (isFlag){
            System.out.println("-----------------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':
                    listAllCustomer();
                    break;
                case '5':
                    System.out.println("是否确认退出(Y/N): ");
                    char isExit = CMUtility.readConfirmSelection();
                    if (isExit == 'Y'){
                        isFlag = false;
                    }
            }
        }
    }

    
    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(15);
        System.out.print("邮箱: ");
        String email = CMUtility.readString(30);

        //将上述数据封装到对象中
        Customer cust = new Customer(name,gender,age,phone,email);
        boolean isSuccess = customerList.addCustomer(cust);
        if (isSuccess){
            System.out.println("-----------------添加完成-----------------");
        }else {
            System.out.println("-----------客户目录已满,添加失败-------------");
        }
    }

    
    private void modifyCustomer(){

        System.out.println("-----------------修改客户-----------------");

        Customer cust;
        int number;
        for (;;){
            System.out.println("请选择修改客户编号(-1退出): ");
            number = CMUtility.readInt();

            if (number == -1){
                return;
            }

            cust = customerList.getCustomers(number - 1);
            if (cust == null){
                System.out.println("无法找到指定的客户!");
            }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(15, 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 {
            System.out.println("-----------------修改失败-----------------");
        }

    }

    
    private void deleteCustomer(){
        System.out.println("-----------------删除客户-----------------");
        int number;
        for (;;){
            System.out.print("请选择待删除客户的编号(-1退出): ");
            number = CMUtility.readInt();

            if (number == -1){
                return;
            }
            Customer custmor = customerList.getCustomers(number - 1);
            if (custmor == null){
                System.out.println("无法找到指定的客户!");
            }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-----------------");
            }
        }
    }

    
    private void listAllCustomer(){
        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ttt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----------------n");
    }

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

Java基本语法（十）：案例（客户信息管理软件）

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