基于HashSet集合完成的微博用户注册的案例

import java.util.Date;
import java.util.Objects;

public class User {
    // 用户名
    private String username;
    // 密码
    private String password;
    // 生日
    private Date birthday;
    // 手机号
    private String phone;
    // 邮箱
    private String email;

// 基于  IntellJ Idea 软件开发的快捷键:
    // Alt + Insert   Getter  And  Setter
    // Alt + Insert   equals  And  hashCode
    // Alt + Insert   toString


    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        User user = (User) o;
        return Objects.equals(username, user.username) &&
                Objects.equals(password, user.password) &&
                Objects.equals(birthday, user.birthday) &&
                Objects.equals(phone, user.phone) &&
                Objects.equals(email, user.email);
    }

    @Override
    public int hashCode() {
        return Objects.hash(username, password, birthday, phone, email);
    }

    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", birthday=" + birthday +
                ", phone='" + phone + '\'' +
                ", email='" + email + '\'' +
                '}';
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    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;
    }
}

import java.util.HashSet;
import java.util.Scanner;

public class UserRegister {

    static HashSet hs = new HashSet();

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("请输入用户名:");
        String username = sc.nextLine();

        System.out.println("请输入密码:");
        String password = sc.nextLine();

        System.out.println("请重复输入密码:");
        String repassword = sc.nextLine();

        System.out.println("请输入出生日期:");
        String birthday = sc.nextLine();

        System.out.println("请输入手机号码:");
        String phone = sc.nextLine();

        System.out.println("请输入电子邮箱:");
        String email = sc.nextLine();


        CheckInfo ci = new CheckInfo();
        String sb = ci.checkInfo(username, password, repassword, birthday, phone, email);
        System.out.println("注册的结果是:" + sb);
    }
}

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;

public class CheckInfo {

    HashSet  hashSet = new HashSet();

    StringBuilder sb = new StringBuilder();
    int  status = 1 ; // 1 代表成功  2 代表 失败
    public String checkInfo(String username,String password,String repassword,String birthday,String phone, String email){
        // 生日的判断
        if (birthday.length() != 10){ //  1999-09-09
            sb.append("您填写的生日格式有误，请检查！");
            status = 2 ;
        }
        // 密码的判断
        if (!password.equals(repassword)){
            sb.append("两次密码填写不一样，请检查！");
            status = 2 ;
        }
        // 手机格式和开头号码的判断
        if (phone.length() != 11){ //  1999-09-09
            sb.append("您填写的手机号码格式有误，请检查！");
            status = 2 ;
        }else if (!(phone.startsWith("13") ||phone.startsWith("15") || phone.startsWith("17") || phone.startsWith("18") ) ){ //  1999-09-09
            sb.append("您填写的手机号码不正确，请检查！");
            status = 2 ;
        }
        // 邮箱的判断
        if (!email.contains("@")){
            sb.append("您填写的电子邮箱格式有误，请检查！");
            status = 2 ;
        }

        // 如果以上信息的校验都是无误  则可以将新用户加入到集合内
        if(status == 1){
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Date dateBirthday = null;

            try {
                dateBirthday = sdf.parse(birthday); //  字符串转为 日期类型 有可能出现错误、错误了 则执行catch内的代码 否则 不执行！
            } catch (ParseException e) {
                e.printStackTrace();// Stack  栈      数据结构与算法:  内存分析
            }
            // 创建user 对象  
            User user = new User();

      //  完成对象的内容封装
            user.setUsername(username);
            user.setPassword(repassword);
            user.setBirthday(dateBirthday);
            user.setPhone(phone);
            user.setEmail(email);
        }

        if (status == 1){
            sb.append("注册成功！");
        }
        return  sb.toString();
    }
}