Java集合实现登陆注册

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public class User {
private String name;//用户名
private String id;//用户ID
private String pwd;//用户密码
public User(String name, String id, String pwd) {
this.name = name;
this.id = id;
this.pwd = pwd;
}
public User() {
}
//创建get和set方法
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
}

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import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Scanner;
public class UserDemo {
static Collection<User> users=new ArrayList<>();//创建一个User类型的集合
Scanner sc=new Scanner(System.in);
User u=new User();
static {//向集合中添加数据
User u1=new User("李白","Tang001","Tang001");
User u2=new User("杜甫","Tang002","Tang002");
users.add(u1);
users.add(u2);
}
//登录方法
public void login(){
System.out.println("请输入用户ID");
String id=sc.next();
System.out.println("请输入密码：");
String pwd= sc.next();
boolean isLogin=false;
Iterator iterator=users.iterator();
while (iterator.hasNext()){//判断密码和账号是否正确
User user=(User) iterator.next();
if(user.getId().equals(id)&&user.getPwd().equals(pwd)){
isLogin=true;
}
}
if (isLogin){
System.out.println("登陆成功！");//当密码和ID都正确时登陆成功
}else{
System.out.println("您的账号或者密码错误，请您重新输入：");
}
}
public void zhuCe(){//注册方法
System.out.println("请输入用户名：");
String name=sc.next();
u.setName(name);
users.add(u);
System.out.println("请输入用户ID：");
String id=sc.next();
u.setId(id);
users.add(u);
System.out.println("请输入用户密码：");
String pwd=sc.next();
System.out.println("请确认您的密码：");
String pwd1=sc.next();
if (pwd.equals(pwd1)){
u.setPwd(pwd);
users.add(u);
}else {
System.out.println("您的用户名和密码不一致，请重新输入：");
}
int num=(int)(Math.random()*9999+1);
System.out.println("随机验证码："+num);
System.out.println("请输入四位随机验证码：");
int num1=sc.nextInt();
if (num1==num){
System.out.println("注册成功");
}else{
System.out.println("验证码输入错误，请重新输入：");
}
}
}

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import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Scanner;
public class UserDemo {
static Collection<User> users=new ArrayList<>();
Scanner sc=new Scanner(System.in);
User u=new User();
static {
User u1=new User("李白","Tang001","Tang001");
User u2=new User("杜甫","Tang002","Tang002");
users.add(u1);
users.add(u2);
}
public void login(){
System.out.println("请输入用户ID");
String id=sc.next();
System.out.println("请输入密码：");
String pwd= sc.next();
boolean isLogin=false;
Iterator iterator=users.iterator();
while (iterator.hasNext()){
User user=(User) iterator.next();
if(user.getId().equals(id)&&user.getPwd().equals(pwd)){
isLogin=true;
}
}
if (isLogin){
System.out.println("登陆成功！");
}else{
System.out.println("您的账号或者密码错误，请您重新输入：");
}
}
public void zhuCe(){
System.out.println("请输入用户名：");
String name=sc.next();
u.setName(name);
users.add(u);
System.out.println("请输入用户ID：");
String id=sc.next();
u.setId(id);
users.add(u);
System.out.println("请输入用户密码：");
String pwd=sc.next();
System.out.println("请确认您的密码：");
String pwd1=sc.next();
if (pwd.equals(pwd1)){
u.setPwd(pwd);
users.add(u);
}else {
System.out.println("您的用户名和密码不一致，请重新输入：");
}
int num=(int)(Math.random()*9999+1);
System.out.println("随机验证码："+num);
System.out.println("请输入四位随机验证码：");
int num1=sc.nextInt();
if (num1==num){
System.out.println("注册成功");
}else{
System.out.println("验证码输入错误，请重新输入：");
}
}
}

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package Login;
public class Test {
public static void main(String[] args) {
Menu menu=new Menu();
menu.showMenu();
}
}