文中所有代码来自尚硅谷宋红康老师的Java课程,如有侵权请联系删除。
该软件能够实现对客户对象的插入、修改和删除(用数组实现),并能够打印客户明细表。
项目采用分级菜单方式。主菜单如下:
-----------------客户信息管理软件-----------------
1 添 加 客 户
2 修 改 客 户
3 删 除 客 户
4 客 户 列 表
5 退 出
请选择(1-5):_
整个项目分为4个Java文件,分别实现功能。
CMUtility文件,实现与客户的交互
package customer.util;
import java.util.*;
public class CMUtil {
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;
}
}
customer代码文件,实现创建客户信息
package customer.bean;
public class customer {
private String name;
private char gender;
private int age;
private String phone;
private String 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 String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public void setEmail(String email) {
this.email = email;
}
public String getEmail() {
return email;
}
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;
}
}
customerList文件,实现客户信息的一些操作
package customer.service;
import customer.bean.customer;
public class customerList {
private customer[] customers; //用来保存用户对象的数组
private int total=0; //记录已保存的客户的数量
public customerList(int totalCustomer){
customers=new customer[totalCustomer];
}
public boolean addcustomer(customer customes){
if (total>=customers.length){
return false;
}
customers[total++]=customes;
return true;
}
public boolean replacecustomer(int index,customer cust){
if (index<0 || index>=total){
return false;
}
customers[index]=cust;
return true;
}
public boolean deletecustomer(int index){
if (index<0 || index>=total){
return false;
}
for (int i=0;i=total){
return null;
}
return customers[index];
}
public int getTotal(){
return total;
}
}
customerView文件,实现主界面实现和逻辑交互
package customer.ui;
import customer.bean.customer;
import customer.service.customerList;
import customer.util.CMUtil;
public class customerview {
private customerList customers=new customerList(10);
public customerview(){
customer cust=new customer("张三", '男', 30, "010-56253825",
"[email protected]");
customers.addcustomer(cust);
}
public void enterMainMenu(){
boolean loopFlag = true;
do {
System.out.println("\n-----------------客户信息管理软件-----------------\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.print(" 请选择(1-5):");
char key = CMUtil.readMenuSelection();
System.out.println();
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 yn = CMUtil.readConfirmSelection();
if (yn == 'Y')
loopFlag = false;
break;
}
} while (loopFlag);
}
private void addNewCustomer() {
System.out.println("---------------------添加客户---------------------");
System.out.print("姓名:");
String name = CMUtil.readString(4);
System.out.print("性别:");
char gender = CMUtil.readChar();
System.out.print("年龄:");
int age = CMUtil.readInt();
System.out.print("电话:");
String phone = CMUtil.readString(15);
System.out.print("邮箱:");
String email = CMUtil.readString(30);
customer cust = new customer(name, gender, age, phone, email);
boolean flag = customers.addcustomer(cust);
if (flag) {
System.out
.println("---------------------添加完成---------------------");
} else {
System.out.println("----------------记录已满,无法添加-----------------");
}
}
private void modifyCustomer() {
System.out.println("---------------------修改客户---------------------");
int index = 0;
customer cust = null;
for (;;) {
System.out.print("请选择待修改客户编号(-1退出):");
index = CMUtil.readInt();
if (index == -1) {
return;
}
cust = customers.getCustomer(index - 1);
if (cust == null) {
System.out.println("无法找到指定客户!");
} else
break;
}
System.out.print("姓名(" + cust.getName() + "):");
String name = CMUtil.readString(4, cust.getName());
System.out.print("性别(" + cust.getGender() + "):");
char gender = CMUtil.readChar(cust.getGender());
System.out.print("年龄(" + cust.getAge() + "):");
int age = CMUtil.readInt(cust.getAge());
System.out.print("电话(" + cust.getPhone() + "):");
String phone = CMUtil.readString(15, cust.getPhone());
System.out.print("邮箱(" + cust.getEmail() + "):");
String email = CMUtil.readString(15, cust.getEmail());
cust = new customer(name, gender, age, phone, email);
boolean flag = customers.replacecustomer(index - 1, cust);
if (flag) {
System.out
.println("---------------------修改完成---------------------");
} else {
System.out.println("----------无法找到指定客户,修改失败--------------");
}
}
private void deleteCustomer() {
System.out.println("---------------------删除客户---------------------");
int index = 0;
customer cust = null;
for (;;) {
System.out.print("请选择待删除客户编号(-1退出):");
index = CMUtil.readInt();
if (index == -1) {
return;
}
cust = customers.getCustomer(index - 1);
if (cust == null) {
System.out.println("无法找到指定客户!");
} else
break;
}
System.out.print("确认是否删除(Y/N):");
char yn = CMUtil.readConfirmSelection();
if (yn == 'N')
return;
boolean flag = customers.deletecustomer(index - 1);
if (flag) {
System.out
.println("---------------------删除完成---------------------");
} else {
System.out.println("----------无法找到指定客户,删除失败--------------");
}
}
private void listAllCustomers() {
System.out.println("---------------------------客户列表---------------------------");
customer[] custs = customers.getAllCustomers();
if (custs.length == 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\t电话\t\t邮箱");
for (int i = 0; i < custs.length; i++) {
System.out.println(i + 1 + "\t" + custs[i].getName() + "\t" + custs[i].getGender() + "\t" + custs[i].getAge() + "\t\t" + custs[i].getPhone() + "\t" + custs[i].getEmail());
//System.out.println((i+1) + "\t" + custs[i].getDetails());
}
}
System.out.println("-------------------------客户列表完成-------------------------");
}
public static void main(String[] args) {
customerview cView = new customerview();
cView.enterMainMenu();
}
}