java子类如何给父类的属性传值？

Question

创建了一个父类，想在子类中给父类的属性传值，现在是代码运行后，显示的是默认值

public  class Message {
    private String name;
    private String sex;
    private int age;
    private int phone;

    public Message(String name,String sex , int age,int phone){
        this.name=name;
        this.age=age;
        this.phone=phone;
        this.sex=sex;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getPhone() {
        return phone;
    }

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

}

import java.util.*;
public class Method extends Message {
    public Method(String name,String sex , int age,int phone){
        super(name,sex,age,phone);
    }
   public Method(){}

    public static void muLu(){
        Scanner sc= new Scanner(System.in);
        while (true) {

            System.out.println("--------客户列表-------");
            System.out.println("1.添加客户信息");
            System.out.println("2.查询客户信息");
            System.out.println("3.退出系统");
            System.out.print("请输入选项：\t");


            int ku = sc.nextInt();
            Message met = new Message();
            switch (ku) {
                case 1:
                    System.out.println("请录入姓名");
                    String xm = sc.next();
                    met.setName(xm);
                    System.out.println("请录入性别");
                    String xb = sc.next();
                    met.setSex(xb);
                    System.out.println("请录入年龄");
                    int nl = sc.nextInt();
                    met.setAge(nl);
                    System.out.println("请录入手机号");
                    int sj = sc.nextInt();
                    met.setPhone(sj);
                    System.out.println("添加客户成功");
                    break;
                case 2:
                    System.out.println("--------客户列表-------");
                    System.out.println("姓名\t" + "性别\t" + "年龄\t" + "电话");
                    System.out.println(met.getName() + "\t" + met.getSex() + "\t"
                            + met.getAge() + "\t" + met.getPhone() );
                    break;
            }


        }
    }

Answer 1

第一没看到子类实例，只看到基类Message定义了个实例
第二你把 Message met = new Message();放在循环里，每次都会重新创建，所以case 1时创建的，和case 2创建的是两个Message实例，自然输出是默认的
把Message met = new Message();放到while循环外就可以了