课堂代码
public class Courier extends Person{
private String courierId;

public Courier(){
}
public Courier(String courierId,String pwd){
    super.setPwd(pwd);
    this.courierId = courierId;
}
public Courier(String courierId,String name,String sex,int age,String pwd){
    super(name,age,pwd,sex); //super只能出现在第一行
    this.courierId = courierId;
}

public String getCourierId() {
    return courierId;
}

public void setCourierId(String courierId) {
    this.courierId = courierId;
}
@Override
public String toString(){
    return "Courier{" +
            "courierId='" + courierId + '\'' +
            "name='" + getName() + '\''+
            "age='" + getAge() + '\''+
            "pwd='" + getPwd() +'\''+
            "sex='" + getSex() + '\''+
            '}';
}

}

public class Customer extends Person {
private String customerId;
private String phone;

public static Customer builder() {
    return new Customer();
}

public String getPhone() {
    return phone;
}

public void setPhone(String phone) {
    this.phone = phone;
}


//构建器  用来构建一个对象
public Customer() {

}


public Customer setCustomerId(String customerId){
    this.customerId = customerId;
    return this;
}

public String getCustomerId(){
    return customerId;
}
public Customer Pwd(String pwd){
    super.setPwd(pwd);
    //this.pwd=pwd
    return this;
}
}

public class Customer extends Person {
private String customerId;
private String phone;

~
public class Customer extends Person {
private String courierId;

    public  Courier(){}
    public  Courier(String courierId, String pwd){
        super.setPwd(pwd);
        this.courierId = courierId;

    }
    public Courier(String courierId,String name,String sex, int age,String pwd){
        super(name,age,pwd,sex);
        // super 只能出现在第一行
        this.courierId = courierId;

    }

    public String getCourierId() {
        return courierId;
    }

    public void setCourierId(String courierId) {
        this.courierId = courierId;
    }

    @Override
    public String toString() {
        return "Courier{" +
                "courierId='" + courierId + '\''
                +"name'" + getName() + '\''
                +"age='" + getAge() + '\''
                +"pwd='" + getPwd() + '\'' +
                "sex='" + getSex() + '\'' +
                '}';
    }
}

~
import com.feige.beans.Customer;
import org.omg.CORBA.UserException;

import java.util.Scanner;

public class loginService {
private Scanner sc = null;
public loginService(Scanner scanner){ this.sc = scanner; }
//注册
public void register(Scanner sc){
System.out.println("请输入用户的编号：");
String clientId = sc.next();
System.out.println("请输入用户的密码：");
String pwd = sc.next();
System.out.println("请输入用户名：");
String name = sc.next();
System.out.println("请输入年龄：");
int age = sc.nextInt();
System.out.println("请输入性别：");
String sex = sc.next();
System.out.println("请输入手机号：");
String phone = sc.next();

    Customer customer = Customer.builder().setCustomerId(clientId).Pwd(pwd);
    customer.setName(name);
    customer.setAge(age);
    customer.setPhone(phone);
    customer.setSex(sex);
    // 把上面的对象保存到数组
    // CustomerData.save(customer);

}

}

package com.feige;

import java.util.Scanner;

public class Main {
Scanner sc = new Scanner(System.in);
public Main(){
}
public void menu(){
System.out.println("==========================");
System.out.println("\t\t欢迎使用快递系统\t\t");
System.out.println("1.用户注册");
System.out.println("2.登录系统");
System.out.println("3.商品查看");
System.out.println("4.退出系统");
System.out.println("请输入：");
int funNO = sc.nextInt();
switch (funNO){
case 1:
//用户注册
break;
case 2:
//登录系统
break;
case 3:
//商品查看
break;
case 4:
//退出系统
default:
sc.close();//关闭扫描器资源
System.exit(0); // 0 正常退出 非0 非正常的中断退出
}
}

public Scanner getSc() {
    return sc;
}

public void setSc(Scanner sc) {
    this.sc = sc;
}

public static void main(String[]args){
    new Main().menu();
}

}