ArrayList＜E＞案例//定义一个方法，将价格低于3000的手机信息返回

import java.util.ArrayList;

public class ArrayListphone {
    public static void main(String[] args){
        //定义一个方法，将价格低于3000的手机信息返回
        Phone p1=new Phone("小米",1000);
        Phone p2=new Phone("苹果",8000);
        Phone p3=new Phone("锤子",2999);
        ArrayList<Phone> list=new ArrayList<>();
list.add(p1);
list.add(p2);
list.add(p3);
ArrayList<Phone> PhoneInfoList=getPhoneInfo(list);
        for (int i = 0; i < PhoneInfoList.size(); i++) {
            Phone p=PhoneInfoList.get(i);
            System.out.println(p.getBrand()+","+p.getPrice());
        }
    }
public static ArrayList<Phone> getPhoneInfo(ArrayList<Phone> list){
        ArrayList<Phone> PhoneList=new ArrayList<>();
    for (int i = 0; i < list.size(); i++) {
        Phone p=list.get(i);
        int price=p.getPrice();
        if(price<3000)//将价格<3000的手机对象存入
        {
            PhoneList.add(p);
        }
    }
return  PhoneList;
    }
}