java Object类是可以接收集合类型的

package com.core.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ObjectListTest {
    public static void main(String[] args) {
        Object obj = createMap();
        if(obj instanceof Map){
            Map<String,Object> map =(Map)obj;
            System.out.println(map.get("name"));
        }
        Object obj1 =createList();
        if(obj1 instanceof List){
            List<String> list = (List)obj1;
            for(int i = 0 ; i < list.size() ; i++ ){
                System.out.println(list.get(i));
            }
        }
    }
    
    public static Map<String,Object> createMap(){
        Map<String, Object> map =new HashMap<String, Object>();
        map.put("name", "张飞");
        map.put("age","10");
        
        return map;
    }
    
    public static List<String> createList(){
        List<String> list =new ArrayList<String>();
        for(int i = 0 ; i < 10 ; i++){
            list.add("吕布"+i);
        }
        return list;
    } 

}

张飞
吕布0
吕布1
吕布2
吕布3
吕布4
吕布5
吕布6
吕布7
吕布8
吕布9