java11-项目1：用户管理系统
1.项目需求：
2.项目设计：
3.项目架构：
4.具体实现代码：
1）工具类：CMUtility
import java.util.*;
public class CMUtility {
private static Scanner scanner = new Scanner(System.in);
public static char readMenuSelection() {
char c;
for(;;) {
String str=readKeyBord(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=readKeyBord(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defalutValue作为返回值
public static char readChar(char defalutValue) {
String str=readKeyBord(1,true);
return (str.length()==0) ?defalutValue: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=readKeyBord(2,false);
try {
n =Integer.parseUnsignedInt(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，并将其作为方法的返回值,如果用户不输入而直接回车，方法将以defalutValue作为返回值
public static int readInt(int defalutValue) {
int n;
for(;;) {
String str=readKeyBord(2,false);
try {
n =Integer.parseUnsignedInt(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 readKeyBord(limit,false);
}
//从键盘读取一长度不超过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defalutValue作为返回值
public static String readString(int limit,String defalutValue ) {
String str=readKeyBord(limit,true);
return str.equals("") ? defalutValue: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=readKeyBord(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 readKeyBord(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;
}
}
2） javabean：Customer
public class Customer {
private String name;
private char gender;
private int age;
private String phone;
private String email;
public Customer() {
super();
}
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;
}
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;
}
}
3）后台服务类：CustomerList
public class CustomerList {
private Customer[] customers;//用来保存客户对象的数组
private int total=0;//记录保存客户的数量
//初始化数组长度
public CustomerList(int totalCustomer) {
customers= new Customer[totalCustomer];
}
//添加客户
public boolean addCustomer(Customer cust) {
if(total>=customers.length) {
return false;
}
customers[total]=cust;
total++;
return true;
}//修改客户
public boolean replaceCustoer(int index,Customer cust) {
if(index<0||index>=total) {
return false;
}
customers[index]=cust;
return true;
}//删除客户
public boolean delteCustomer(int index) {
if(index<0||index>total) {
return false;
}
for(int i=index;i
}
customers[total-1]=null;
total--;
return true;
}//获取所有客户
public Customer[] getAllCustomers() {
Customer[] cust= new Customer[total];
for (int i=0;i
}
return cust;
}
//获取指定客户
public Customer getCustomer(int index) {
if(index<0||index>total) {
return null;
}
return customers[index];
}//获取客户数量
public int getTotal() {
return total;
}
}
4）前端展示类：CustomerView
public class CustomerView {
private CustomerList customerlist= new CustomerList(10);
public CustomerView() {
Customer cust =new Customer("张三",'男',20,"13917342345","[email protected]");
customerlist.addCustomer(cust);
}
public static void main(String[] args) {
CustomerView view =new CustomerView();
view.enterMainMenum();
}
public void enterMainMenum() {
boolean isflag=true;
while(isflag) {
System.out.println("**************客户信息*******************");
System.out.println(" 1.新增客户");
System.out.println(" 2.修改客户");
System.out.println(" 3.删除客户");
System.out.println(" 4.查询客户");
System.out.println(" 5.退出");
System.out.print("请选择1-5:");
char menu=com.cn.project01.util.CMUtility.readMenuSelection();
switch(menu) {
case '1':
addNewCustomer();
break;
case '2':
modifyCustomer();
break;
case '3':
deleteCustomer();
break;
case '4':
listAllCustomer();
break;
case '5':
System.out.println("确认退出请输入Y，否输入N \n");
char readConfirmSelection = CMUtility.readConfirmSelection();
if(readConfirmSelection=='Y') {
isflag=false;
}
}
}
}
//新增客户
public void addNewCustomer() {
System.out.println("***************添加客户***************************");
System.out.println("姓名：\n");
String name=CMUtility.readString(10);
System.out.println("性别：\n");
char gender=CMUtility.readChar();
System.out.println("年龄：\n");
int age=CMUtility.readInt();
System.out.println("电话：\n");
String phone=CMUtility.readString(11);
System.out.println("邮箱：\n");
String email=CMUtility.readString(20);
Customer cust =new Customer(name,gender,age,phone,email);
boolean addCustomer = customerlist.addCustomer(cust);
if(addCustomer) {
System.out.println("添加成功！");
}else {
System.out.println("列表已满，不能添加！");
}
}
//修改客户
public void modifyCustomer() {
Customer customer;
int number;
for(;;) {
System.out.println("请输入修改客户的编号(-1退出)");
number=CMUtility.readInt();
if(number==-1) {
return ;
}
customer = customerlist.getCustomer(number-1);
if(customer ==null) {
System.out.println("无该客户");
}else {
break;
}
}
//修改客户信息
System.out.println("姓名："+customer.getName());
String name=CMUtility.readString(10, customer.getName());
System.out.println("性别："+customer.getGender());
char gender=CMUtility.readChar(customer.getGender());
System.out.println("年龄："+customer.getAge());
int age =CMUtility.readInt(customer.getAge());
System.out.println("电话："+customer.getPhone());
String phone=CMUtility.readString(10, customer.getPhone());
System.out.println("邮箱："+customer.getEmail());
String email=CMUtility.readString(10, customer.getEmail());
Customer newcust= new Customer(name,gender,age,phone,email);
boolean replaceCustoer = customerlist.replaceCustoer(number-1, newcust);
if(replaceCustoer) {
System.out.println("修改成功！");
}else {System.out.println("修改失败！");}
}
//查询客户
public void listAllCustomer() {
System.out.println("*******客户信息开始展示******************");
int total =customerlist.getTotal();
if(total==0) {
System.out.println("客户信息不存在");
}else {
System.out.println("编号 \t姓名\t 性别 \t 年龄 \t 手机号 \t 邮箱");
Customer[] custs=customerlist.getAllCustomers();
for(int i=0;i
System.out.println((i+1)+ "\t"+cust.getName()+ "\t"+cust.getGender()+ "\t"+cust.getAge()+ "\t"+cust.getPhone()+ "\t"+cust.getEmail());
}
}
System.out.println("*******客户信息结束展示******************");
}
//删除客户
public void deleteCustomer() {
int number;
for(;;) {
System.out.println("************删除客户***********");
System.out.println("请输入修改客户的编号(-1退出)");
number =CMUtility.readInt();
if(number==-1) {
return ;
}else {
break;
}
}
System.out.println("确认是否删除 确认Y ，不删除N");
char readConfirmSelection = CMUtility.readConfirmSelection();
if(readConfirmSelection=='Y') {
boolean delteCustomer = customerlist.delteCustomer(number-1);
if(delteCustomer) {
System.out.println("删除成功！");
}else {
System.out.println("删除失败！");
}
}
}
}
5）测试：
执行CustomerView 类，根据界面提示进行 新增，修改，查询，删除等操作