1. Customer.java
- package chapter07.pinExer;
- // 客户类
- public class Customer {
- private String name;
- private char gender; //性别
- private int age;
- private String phone;
- private String email;
- // 构造器
- public Customer(){
- }
- public Customer(String name, char gender, int age, String phone, String email){
- this.name = name;
- this.age = age;
- this.gender = gender;
- this.phone = phone;
- this.email = email;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getName() {
- return name;
- }
- public void setGender(char gender) {
- this.gender = gender;
- }
- public char getGender() {
- return gender;
- }
- public void setAge(int age) {
- this.age = age;
- }
- public int getAge() {
- return age;
- }
- public void setPhone(String phone) {
- this.phone = phone;
- }
- public String getPhone() {
- return phone;
- }
- public void setEmail(String email) {
- this.email = email;
- }
- public String getEmail() {
- return email;
- }
- }
复制代码 2. CustomerList.java
- package chapter07.pinExer;
- // CustomerList为Customer对象管理模块,内部使用数组管理一组Customer对象
- public class CustomerList {
- private Customer[] customers;
- private int total = 0; // 最大长度
- public CustomerList(int totalCustomer){
- customers = new Customer[totalCustomer];
- }
- //添加成员,成功返回true,失败返回false
- public boolean addCustomer(Customer customer){
- if(total < customers.length){
- customers[total] = customer;
- total++;
- return true;
- }
- return false;
- }
- // 替换,用参数customer替换数组中由index指定的对象
- public boolean replaceCustomer(int index, Customer cust){
- if(index >= 0 && index < total){
- customers[index] = cust;
- return true;
- }
- return false;
- }
- // 删除,从数组中删除index指定索引位置的客户对象记录
- public boolean deleteCustomer(int index){
- if(index >= 0 && index < total){
- for(int i = index; i < total; i++){
- customers[i] = customers[i+1];
- }
- //将最后一个有效位置的数值置空
- customers[total - 1] = null;
- total--;
- return true;
- }
- return false;
- }
- // 返回数组中记录的所有客户对象
- public Customer[] getAllCustomers(){
- Customer[] custs = new Customer[total];
- for(int i = 0; i < total; i++){
- custs[i] = customers[i];
- }
- return custs;
- }
- // 返回index指定索引位置客户的记录
- public Customer getCustomer(int index){
- if(index >=0 && index < total){
- return customers[index];
- }
- return null;
- }
- // 获取客户列表中有几个客户
- public int getTotal(){
- return total;
- }
- }
复制代码 CMUtility.java 工具类
- package chapter07.pinExer;
- import java.util.*;
- 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;
- }
- }
复制代码 4. CustomerView.java 主模块
- package chapter07.pinExer;
- import chapter07.pinExer.Customer;
- // 主模块,负责菜单的显示和处理用户操作
- public class CustomerView {
- int totalCustomers = 10;
- CustomerList customerList = new CustomerList(totalCustomers);
- // 进入主界面
- public void enterMainMenu(){
- boolean flag = true;
- while(flag){
- System.out.println("\n------------------拼电商管理系统------------------\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.println(" 请选择(1-5)");
- char key = CMUtility.readMenuSelection();
- switch(key){
- 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'){
- flag = false;
- }
- break;
- }
- }
- }
- private void addNewCustomer(){
- System.out.println("\n---------------------添加客户---------------------");
- if (customerList.getTotal() >= totalCustomers) {
- System.out.println("----------------客户列表已满,无法添加---------------");
- return;
- }
- 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(20);
- Customer cust = new Customer(name, gender, age, phone, email);
- boolean isAdded = customerList.addCustomer(cust);
- if (isAdded) {
- System.out.println("---------------------添加完成---------------------");
- } else {
- System.out.println("---------------------添加失败---------------------");
- }
- }
- private void modifyCustomer(){
- System.out.println("\n---------------------修改客户---------------------");
- while (true) {
- System.out.print("请选择待修改客户编号(-1退出):");
- int number = CMUtility.readInt();
- if (number == -1) {
- return; //如果输入-1,则直接结束方法
- } else if (number <= 0 || number > customerList.getTotal()) {
- System.out.println("无法找到指定客户!");
- } else {
- System.out.print("姓名(" + customerList.getCustomer(number - 1).getName() + "):");
- String newName = CMUtility.readString(10, customerList.getCustomer(number - 1).getName());
- System.out.print("性别(" + customerList.getCustomer(number - 1).getGender() + "):");
- char newGender = CMUtility.readChar(customerList.getCustomer(number - 1).getGender());
- System.out.print("性别(" + customerList.getCustomer(number - 1).getAge() + "):");
- int newAge = CMUtility.readInt(customerList.getCustomer(number - 1).getAge());
- System.out.print("电话(" + customerList.getCustomer(number - 1).getPhone() + "):");
- String newPhone = CMUtility.readString(13, customerList.getCustomer(number - 1).getPhone());
- System.out.print("邮箱(" + customerList.getCustomer(number - 1).getEmail() + "):");
- String newEmail = CMUtility.readString(20, customerList.getCustomer(number - 1).getEmail());
- Customer cust = new Customer(newName, newGender, newAge, newPhone, newEmail);
- boolean isReplaced = customerList.replaceCustomer(number - 1, cust);
- if (isReplaced) {
- System.out.println("---------------------修改完成---------------------");
- } else {
- System.out.println("---------------------无法修改---------------------");
- }
- return;
- }
- }
- }
- private void deleteCustomer(){
- System.out.println("\n---------------------删除客户---------------------");
- while (true) {
- System.out.print("请选择待删除客户编号(-1退出):");
- int number = CMUtility.readInt();
- if (number == -1) {
- return; //如果输入-1,则直接结束方法
- } else if (number <= 0 || number > customerList.getTotal()) {
- System.out.println("无法找到指定客户!");
- } else {
- System.out.print("确认是否删除(Y/N):");
- char isDelete = CMUtility.readConfirmSelection();
- if (isDelete == 'Y') {
- boolean isDeleted = customerList.deleteCustomer(number - 1);
- if (isDeleted) {
- System.out.println("---------------------删除完成---------------------");
- } else {
- System.out.println("---------------------删除失败---------------------");
- }
- }
- return;
- }
- }
- }
- private void listAllCustomers(){
- System.out.println("----------------------------------客户列表----------------------------------");
- if (customerList.getTotal() == 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[] custs = customerList.getAllCustomers();
- for (int i = 0; i < custs.length; i++) {
- System.out.println((i + 1) + "\t\t" + custs[i].getName() + "\t\t" + custs[i].getGender() + "\t\t"
- + custs[i].getAge() + "\t\t" + custs[i].getPhone() + "\t\t" + custs[i].getEmail());
- }
- }
- System.out.println("--------------------------------客户列表完成---------------------------------");
- }
- public static void main(String[] args) {
- CustomerView view = new CustomerView();
- view.enterMainMenu();
- }
- }
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