在Java中写一个电话类(Phone)，具有品牌brand、型号model、价格price三个属性。用键盘输入信息，并排序。

写一个电话类(Phone)，具有品牌brand、型号model、价格price三个属性。从键盘上输入若干条电话信息，根据它们的价格由低到高排序。如果价格相同，则按照品牌的字母排序（由a到z）并把电话信息的排序结果写入磁盘文件。要求用户从键盘上输入指定品牌和型号的电话，再从前面写入文件中读取电话信息，要求删除用户指定的品牌型号的电话之后将结果保存为新文件。
请给出具体思路

package com.example.demo;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Phone implements Comparable<Phone>{
    private String brand;
    private String model;
    private int price;

    public Phone(String brand, String model, int price) {
        this.brand = brand;
        this.model = model;
        this.price = price;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    @Override
    public int compareTo(Phone o) {
        //先按照价格排序
        if (this.price>o.price){
            return (this.price-o.price);
        }
        if (this.price<o.price){
            return (this.price-o.price);
        }

        //再按照品牌排序
        if (this.brand.compareTo(o.getBrand())>0){
            return 1;
        }
        if (this.brand.compareTo(o.getBrand())>0){
            return -1;
        }
        return 0;
    }

    @Override
    public String toString() {
        return "Phone{" +
                "brand='" + brand + '\'' +
                ", model='" + model + '\'' +
                ", price=" + price +
                '}';
    }

    public static void main(String[] args) {
        List<Phone> list = new ArrayList<Phone>();
        list.add(new Phone("a","6.6英寸",6000));
        list.add(new Phone("b","6.6英寸",7000));
        list.add(new Phone("b","6.6英寸",6000));
        list.add(new Phone("c","6.6英寸",8000));
        Collections.sort(list);
        for (Phone phone: list) {
            System.out.println(phone);
        }
    }
}