如何使用gson将json数据转换为java对象？

Question

I have a json string. I want to convert it to java object. My entity class is Deneme.java .

Result variable stores json string. How can I make this process?

I get an error: Expected BEGIN_OBJECT but was BEGIN_ARRAY

Data coming from the server is,

 {"games":
       [   
            {"game":"Football","probability":0.74656546},
            {"game":"Football","probability":0.23432424},
            {"game":"Football","probability":0.2342342343}
       ]
 }

Deneme.java is,

import com.google.gson.JsonObject;
import org.json.JSONArray;

import java.util.List;

public class Deneme {

    private List<JsonObject> matches;

    public List<JsonObject> getMatches() {
        return matches;
    }

    public void setMatches(List<JsonObject> matches) {
        this.matches = matches;
    }
}

My code is:

Gson gson = new Gson();
Deneme obj = gson.fromJson(result, Deneme.class);

Answer 1

You need to have same name when you are converting to Deneme

Change,

private List<JsonObject> matches;

To,

private List<JsonObject> games;

Answer 2

With your current structure you could use something like :

    public class Deneme {

        private List<JsonObject> games;

        public List<JsonObject> getMatches() {
            return games;
        }

        public void setMatches(List<JsonObject> games) {
            this.games = games;
        }
    }

    public static void main(String[] args) {

        Deneme deneme = new Gson().fromJson(json, Deneme.class);

        deneme.getMatches().forEach(System.out::println);
    }

You should change private List<JsonObject> matches to private List<JsonObject> games .

The output is :

{"game":"Football","probability":0.74656546}
{"game":"Football","probability":0.23432424}
{"game":"Football","probability":0.2342342343}

I think that in your case it could be better to create class Game and store list of Game objects inside your Deneme class, because now you are just storing JsonObject 's.