[Java] java实现客户信息管理系统

package com.p2.util;
 
import java.util.*;
 
/**
 * 工具类
 * 讲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。
 * 返回值为用户选择的数字。
 **/
 public static char readMenuSelection(){
 char c;
 for (; ; ){
 String str = readaKeyBoard(1, false);
 c = str.charAt(0);
 if (c != '1' && c!= '2' && c!= '3' && c!= '4'
 && c!= '5'){
 System.out.println("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 = readaKeyBoard(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 = readaKeyBoard(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 = readaKeyBoard(2, false);
 try{
 n = Integer.parseInt(str);
 break;
 }catch(NumberFormatException e){
 System.out.println("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 = readaKeyBoard(2, true);
 if (str.equals("")){
 return defaultValue;
 }
 try{
 n = Integer.parseInt(str);
 break;
 }catch(NumberFormatException e){
 System.out.println("数字输入错误，请重新输入：");
 }
 }
 return n;
 }
 /**
 * 从键盘 读取一个长读不超过limit的字符串，并将其作为方法的返回值。
 **/
 public static String readString (int limit){
 return readaKeyBoard(limit,false);
 }
 
 public static String readString (int limit, String defaultValue){
 return readaKeyBoard(limit,false);
 }
 /**
 * 从键盘读取一个疮毒不超过limit的字符串，将其作为方法的返回值。
 * 如果用户不输入字符而直接回车，方法以defaultValue作为返回值。
 **/
 public static char readComfirmSelection(){
 char c;
 for (; ; ){
 String str = readaKeyBoard(1, false).toUpperCase();
 c = str.charAt(0);
 if (c == 'Y' || c == 'N'){
 break;
 }else{
 System.out.println("选择错误，请重新输入：");
 }
 }
 return c;
 }
 private static String readaKeyBoard(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.println("输入长度（不大于" + limit + "）错误，请重新输入：");
 continue;
 }
 break;
 }
 return line;
 }
}

package com.p2.bean;
/**
 * 把对象封装到方法里面
 * 
 * 
 **/
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
 //构造器
 
 //方法(封装)
 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 Customer() {
 
 }
 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;
 }
 
 
}

package com.p2.service;
/**
 * 最主要的
 * 
 **/
import com.p2.bean.Customer;
 
public class CustomerList {
 private Customer[] customers;
 private int total = 0;
 //构造器
 /**
 * 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){//给正在创建的对象进行初始化
 customers = new Customer[totalCustomer];
 }
 //方法 
 /**
 * 将指定的客户添加到数组中
 * @param customer
 * @return成功true，失败:false
 **/
 public boolean addCustomer(Customer customer){//增
 if(total < 0 || total >= customers.length){
 return false;
 }
 customers[total++] = customer;
 return true;
 }
 /**
 * 修改指定位置的客户信息
 * @param index
 * @param cust
 * @return
 **/
 public boolean replaceCustomer(int index, Customer cust){//改
 if(index <0 || index >= total){
 return false;
 }
 customers[index] = cust;
 return true;
 }
 /**
 * 删除指定位置上的客户
 * @param index
 * @return
 **/
 public boolean deleteCustsomer(int index){//删除
 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 --;
 customers[-- total] = null;
 return true;
 
 }
 /**
 * 获得所有的客户信息
 * @return
 **/
 public Customer[] getAllCustomers() {//查询所有
 Customer[] custs = new Customer[total];
 for(int i = 0; i < total; i++){
 custs[i] = customers[i];
 }
 return custs;
 }
 /**
 * 获取指定位置上的客户信息
 * @param index
 * @return
 **/
 public Customer getCustomer(int index) {//查询一个
 if(index < 0 || index >= total){
 return null;
 }
 return customers[index];
 }
 //封装
 /**
 * 获取存储客户的的数量
 * @return
 **/
 public int getTotal() {//统计数据
 return total;
 }
}

package com.p2.ui;
 
import com.p2.bean.Customer;
import com.p2.service.CustomerList;
import com.p2.util.CMUtility;
 
/**
 * 
 * 用户交互
 * 
 * 
 * 
 **/
public class CustomerView {
 private CustomerList customerList = new CustomerList(100);
 
 public CustomerView(){
 Customer customer = new Customer("王涛",'男', 23, "13213123","wt@gmail.com");
 customerList.addCustomer(customer);
 }
 /**
 * 显示《客户信息管理软件》
 **/
 public void enterMainMenu(){
 
 boolean isFlag = true;
 while(isFlag){
 System.out.println("\n----------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 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.println("确认是否退出(Y/N):");
 char isExit = CMUtility.readComfirmSelection();
 if(isExit =='Y'){
 isFlag = false;
 }
// break;
 }
 
// isFlag = false;
 }
 
 }
 /**
 * 添加客户
 * 
 **/
 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(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 isSucccess = customerList.addCustomer(customer);
 if(isSucccess){
 System.out.println("------添加完成------");
 }else{
 System.out.println("------客户已满------");
 } 
 
 }
 /**
 * 修改客户
 **/
 private void modifyCustomer(){
 System.out.println("---------修改客户-------");
 Customer cust;
 int number;
 for(;;){
 System.out.print("选择要修改的客户编号(-1退出):");
 number = CMUtility.readInt();
 
 if (number == -1){
 return;
 }else{
 cust = customerList.getCustomer(number - 1);
 if(cust == null){
 System.out.println("无法找到指定客户！！");
 }else{//找到相应的客户
 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("修改成功！！");
 }else{
 System.out.println("修改失败！！");
 }
 
 }
 /**
 * 删除客户
 **/
 private void deleteCustomer(){
 System.out.println("-------删除客户-------");
 int number;
 for(;;){
 System.out.print("请选择呆删除客户的编号(-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;
 }
 }
 //找到客户了
 
 System.out.println("是否确认删除（Y/N）:");
 char isDelete = CMUtility.readComfirmSelection(); 
 if(isDelete == 'Y'){
 boolean deleteSuccess = customerList.deleteCustsomer(number - 1);
 if(deleteSuccess ){
 System.out.println("-----------删除成功---------");
 }else{
 System.out.println("-----------删除失败---------");
 }
 }else{
 return;
 }
 }
 /**
 * 显示客户列表
 **/
 private void listAllCustomers(){
// System.out.println("显示客户");
 System.out.println("---------客户列表-------");
 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("---------客户列表结束-------");
 }
 
 public static void main(String[] args) {
 CustomerView view = new CustomerView();
 view.enterMainMenu();
 }
 
}