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;
}
}
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;
}
}
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;
}
}
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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