项目中主要设计三个类。
Customer为客户的实体,用来封装客户的信息。
CustomerList为Customer对象的管理类,内部是通过一个对象数组对其中的Customer对象进行管理。
CustomerView负责视图部分,调用CustomerList来进行增删改查的操作。
CMUtility为工具类,主要负责读取一些信息。
Customer.java:
package com.wuzec.bean;
/**
* Customer为实体对象,用来封装客户信息
* @author wuzec
*
*/
public class Customer {
private String name; //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
//get、set方法
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;
}
//构造器
public Customer() {
}
public Customer(String name, char gender, int age, String phone, String email) {
super();
this.name = name;
this.gender = gender;
this.age = age;
this.phone = phone;
this.email = email;
}
}
CustomerList.java:
package com.wuzec.service;
import com.wuzec.bean.Customer;
/**
* CustomerList为对象Customer对象的管理模块
* 内部用数组管理一组Customer对象,并提供相应的增删改、遍历方法
* 供CustomerView调用
* @author wuzec
*
*/
public class CustomerList {
private Customer[] customers; //用来保存客户对象数组
private int total = 0; //记录已经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];
}
/**
* 将指定客户添加到数组中
* @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++;
//或者
customers[total++] = customer;
return true;
}
/**
* 修改指定位置的索引信息
* @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;
}
/**
* 删除指定位置上的用户
* @param index
* @return
*/
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];
}
//最后数据的元素置空
//customers[total - 1] = null;
//total--;
customers[--total] = null;
return true;
}
/**
* 获取所有客户的信息
* @return
*/
public Customer[] getAllCustomers() {
Customer[] custs = new Customer[total];
for(int i=0; i<custs.length; i++) {
custs[i] = customers[i];
}
return custs;
}
/**
* 获取指定位置上的客户
* @param index
* @return 如果找到了元素,则返回,没找到则返回null
*/
public Customer getCustomer(int index) {
if(index < 0 || index >= total) {
return null;
}
return customers[index];
}
/**
* 获取客户数量
* @return
*/
public int getTotal() {
return total;
}
}
CustomerView:
package com.wuzec.view;
import com.wuzec.bean.Customer;
import com.wuzec.service.CustomerList;
import com.wuzec.util.CMUtility;
/**
* CustomerView为主模块,负责菜单的显示和处理用户操作
* @author wuzec
*
*/
public class CustomerView {
private CustomerList customerList = new CustomerList(10);
public CustomerView() {
Customer cust = new Customer("uzi",'男',18,"1234567","[email protected]");
customerList.addCustomer(cust);
}
/**
* 显示客户信息管理软件界面
*/
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");
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;
}
}
}
/***
* 添加客户操作
*/
private void addNewCustomer() {
// System.out.println("添加");
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);
//添加到对象中
Customer customer = new Customer(name, gender, age, phone, email);
boolean isSuccess = customerList.addCustomer(customer);
if(isSuccess) {
System.out.println("------------------添加成功---------------------------------");
}else {
System.out.println("------------------客户目录已满,添加失败---------------------------------");
}
}
/***
* 修改客户操作
*/
private void modifyCustomer() {
System.out.println("--------------------修改客---------------------------");
Customer cust;
int number;
for(;;) {
System.out.println("请输入待修改的客户标号(-1退出):");
number = CMUtility.readInt();
if(number == -1) {
return ;
}
cust = customerList.getCustomer(number - 1);
if(cust == null) {
System.out.println("无法找到指定用户!!");
}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 isReplaced = customerList.replaceCustomer(number-1, newCust);
if(isReplaced) {
System.out.println("-----------修改完成-------------------------");
}else {
System.out.println("-----------修改失败---------------------");
}
}
/***
* 删除客户操作
*/
private void deleteCustomer() {
//System.out.println("删除");
System.out.println("----------------删除客户----------------");
int number;
for(;;) {
System.out.print("请输入待删除的客户编号(-1退出):");
number = CMUtility.readInt();
if(number == -1) {
return;
}
Customer customer = customerList.getCustomer(number - 1);
if(customer == null) {
System.out.println("无法找到指定用户");
}else {
break;
}
}
System.out.print("是否确认删除(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-----------------");
}
}
}
/**
* 显示客户列表
*/
private void listAllCustomers() {
//System.out.println("显示列表");
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();
}
}
CMUtility.java:
package com.wuzec.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;
}
}
参考资料:
[1]尚硅谷宋康红java基础教程