import com.alibaba.fastjson.JSON;
import com.imooc.vo.Person;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class JsonMapListUtil {
    public static void main(String[] args) {

        // Map 與 Json 互轉
        Map<Integer,Integer> integerMap=Map.of(11,22,44,55,66,77,100,200);
        String integerMapString
 
= JSON.toJSONString(integerMap,true);
        System.out.println("integerMapString:"+integerMapString);

        //預設型別 會轉換成JSONObject型別，即 Map<String,Object>的子類
        Map<String,Object> objMap=JSON.parseObject(integerMapString);
        System.out.println("objMap: "+objMap);
        //objMap: {"66":77,"11":22,"44":55,"100":200} 此時的key型別為String，與之前不一致

        
 
// 後面加 Map.class 轉換為 Map型別
        Map<Integer,Integer> objMap22=JSON.parseObject(integerMapString,Map.class);
//        Map<Object,Object> objMap22=JSON.parseObject(integerMapString,Map.class);
        System.out.println("objMap22: "+objMap22);
        // {66=77, 100=200, 11=22, 44=55}  此時結果是正確的，與之前的型別一致
 

        
        for (Map.Entry<Integer,Integer> entry:objMap22.entrySet()){
            System.out.println(entry.getKey() instanceof Integer); //全部 true
            System.out.println(entry.getValue() instanceof Integer);//全部 true
        }
        
        // List 與 Json 互轉
        List<Person> people=new ArrayList<>();
        people.add(new Person("zhangsan"));
        people.add(new Person("zhangsan22"));
        people.add(new Person("zhangsan33"));

        String peopleJson= JSON.toJSONString(people,true);
        System.out.println("peopleJson:"+peopleJson);

        List<Person> people1=JSON.parseArray(peopleJson,Person.class);
        System.out.println("people1:"+people1);

        List<String> pp=List.of("11","22","33");
        String ppJson=JSON.toJSONString(pp,true);
        System.out.println("ppJson:"+ppJson);

        List<String> pp1=JSON.parseArray(ppJson,String.class);
        System.out.println("pp1:"+pp1);
        System.out.println("pp:"+pp);

        List<Integer> ppp=List.of(11,22,33);
        String pppJson=JSON.toJSONString(ppp,true);
        System.out.println("pppJson:"+pppJson);

//        List<Integer> ppp1=JSON.parseArray(pppJson,Integer.class);
        List<Object> ppp1=JSON.parseArray(pppJson);
        System.out.println("ppp1:"+ppp1);
        System.out.println("ppp:"+ppp);
        for (Object i:ppp1){
            System.out.println(i instanceof Integer);
            System.out.println(i instanceof String);
        }
    }
}