[Java] import org.json.*

MainActivity.java

package com.jwsoft.javaproject;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        try {
            String jsonString = "{" +
                    " 'name':'James Kim'," +
                    " 'age':30," +
                    " 'hobby':['music', 'movie']," +
                    " 'privacy':{ 'height':184, 'weight':84 }" +
                    " }";

            JSONObject jsonObject = new JSONObject(jsonString);

            Log.e("jsonObject", jsonObject.toString());
            Log.e("name", jsonObject.getString("name"));
            Log.e("age", Integer.toString(jsonObject.getInt("age")));

            JSONArray array = jsonObject.getJSONArray("hobby");
            Log.e("hobby", array.toString());
            for (int i=0; i<array.length(); i++) {
                Log.e("hobby " + i, array.get(i).toString());
            }

            JSONObject jsonPrivacy = new JSONObject(jsonObject.getJSONObject("privacy").toString());
            Log.e("privacty", jsonPrivacy.toString());
            Log.e("height", jsonPrivacy.get("height").toString());
            Log.e("weight", jsonPrivacy.get("weight").toString());

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

}

 

실행 결과

 

 

 

 

 

 

 

---

MainActivity.java

package com.jwsoft.javaproject;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        try {

            JSONObject jsonObject = new JSONObject();
            jsonObject.put("name", "James Kim");
            jsonObject.put("age", 30);

            JSONArray hobbyArray = new JSONArray();
            hobbyArray.put("music");
            hobbyArray.put("movie");
            jsonObject.put("hobby", hobbyArray);

            JSONObject privacyObject = new JSONObject();
            privacyObject.put("height", 184);
            privacyObject.put("weight", 84);
            jsonObject.put("privacy", privacyObject);

            Log.e("jsonObject", jsonObject.toString());
            Log.e("name", jsonObject.getString("name"));
            Log.e("age", Integer.toString(jsonObject.getInt("age")));

            JSONArray arrHobby = jsonObject.getJSONArray("hobby");
            Log.e("hobby", arrHobby.toString());
            for (int i=0; i<arrHobby.length(); i++) {
                Log.e("hobby " + i, arrHobby.get(i).toString());
            }

            JSONObject jsonPrivacy = new JSONObject(jsonObject.getJSONObject("privacy").toString());
            Log.e("privacy", jsonPrivacy.toString());
            Log.e("height", Integer.toString(jsonPrivacy.getInt("height")));
            Log.e("weight", jsonPrivacy.getString("weight"));

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

}

실행 결과