How to parse JSON string into ArrayList using Java?

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I am getting following response from an API

String response={"balance":1000,
  "lastliability":2000,"profitarray":[[1,2,3],[67,88,99]],"previous":[99,88]}

I am trying to convert profitarray to ArrayList in Java like

    JSONObject res=new JSONObject(response);
    ArrayList<ArrayList<Integer>> temp=res.getString("profitarray")//something like this
ArrayList<Integer>yy=res.getString("previous");

Obviously, the outputs of res.getstring will be String and I want to convert them to ArrayList, any idea how to do it?

The key thing is to create a Java class that model your response. See this example using Google Gson.

Response class:

import java.util.ArrayList;

public class Response {
//    int balance;
//    int lastLiability;
//    ArrayList<Integer> previous;
    ArrayList<ArrayList<Integer>> profitarray;
}

Gson example:

import com.google.gson.Gson;

public class GsonExample {
    public static void main(String[] args) {
        String json = "{\"balance\":1000,\"lastliability\":2000,\"profitarray\":[[1,2,3],[67,88,99]],\"previous\":[99,88]}";

        Response response = new Gson().fromJson(json, Response.class);
        System.out.println(response.profitarray);
    }
}

I guess that you should add accessors, equals/hashCode and all that noise — but you get the idea.

How to convert this json String to normal java arraylist using gson , By mkyong | Last updated: April 24, 2019. Viewed: 137,106 | +2,054 pv/w. Few Jackson examples to convert a JSON array string to a List. // JSON array string 1.2 Create an object to map the above JSON fields. package ObjectMapper; import java.io.IOException; import java.util.Arrays Tags : jackson json json array list  i need it to be converted into arraylist that will be inserted into JTable into java. I've read about GSON and a few article to do this but i still don't understand. Can you give me example how to do this? thanks. Hi Melody, You can use jackson library to convert json object to arraylist, first, you need to create a POJO

You can use JsonArray to extract an array out of a JSON response. Later on, you can use Collections API to convert that array into an ArrayList.

    JsonObject res = new JsonObject(response);
    JsonArray array1 = res.getJsonArray("profitarray");
    JsonArray array2 = res.getJsonArray("previous");

    ArrayList<JsonObject> arrayList1 = new ArrayList(array1.length());
    ArrayList<JsonObject> arrayList2 = new ArrayList(array2.length());

    for(int i=0;i < array1.length();i++){
    arrayList1.add(array1.getJsonObject(i));
}
    for(int j=0;j < array2.length();j++){
    arrayList2.add(array2.getJsonObject(j));
}

Jackson - Convert JSON array string to List, Java programming tutorial to convert JSON array to String array with example, by using Gson library. Though you can also use other open  1) First split the string using String split() method and assign the substrings into an array of strings. We can split the string based on any character, expression etc. 2) Create an ArrayList and copy the element of string array to newly created ArrayList using Arrays.asList() method. This method returns a list created based on the elements of

Could be a complex way to do it, but since you wanted an ArrayList>, here we are

public static void main(String[] args) {
    String response = "{\"balance\":1000,\n" +
            "  \"lastliability\":2000,\"profitarray\":[[1,2,3],[67,88,99]],\"previous\":[99,88]}";
    JSONObject res=new JSONObject(response);
    JSONArray array = res.getJSONArray("profitarray");
    ArrayList<JSONArray> profitList = new ArrayList<>();
    for (int i = 0; i < array.length(); i++){
        profitList.add(array.getJSONArray(i));
    }
    ArrayList<ArrayList<Integer>> finalList = new ArrayList<>();
    ArrayList<Integer> list1 = new ArrayList<>();
    for (int i = 0; i < profitList.size(); i++){
        JSONArray array1 = profitList.get(i);
        list1 = new ArrayList<>();
        for (int j = 0; j < array1.length(); j++){
            list1.add(array1.getInt(j));
        }
        finalList.add(list1);
    }
}

The ArrayList finalList contains the final output.

How to Convert JSON array to String array in Java , In this tutorial we will look at how to parse JSON in Java using different libraries. JSONObject; public class ParseJSON { static String json = ". How to parse JSON in Java JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data exchange format that is easy for humans and machines to read and write. JSON can represent two structured types: objects and arrays.

How to Parse JSON in Java, Learn to use Google GSON library to deserialize or parse JSON, containing json array, ArrayList;. import com.google.gson.Gson;. import com.google.gson.​reflect. Java program to deserialize json array as member object – to Java array of  Simplest way to generate logs in Java using java.util.logging’s SimpleFormatter and XMLFormatter; Linux and Curl: How to use Bash to Read a File Line by Line and Execute Curl command to get HTTP Response Code; Java ConcurrentNavigableMap and ConcurrentSkipListMap Tutorial with all Details (java.util.concurrent.*)

GSON - Parse JSON array to Java array or list, Convert JSON Array String in Java Array List; How to convert Java objects like Map or List into JSON objects. I think the above is all you will most  2. Parse JSON array as member. Gson parses JSON arrays as members without difficulty if they are non-root objects. We can use the fromJson() method in usual manner and it will parse the json array correctly to required java array or list.

Convert Java into JSON and JSON into Java. All Possible Examples , The other parse* methods are similar in that they return a JSON String but for or java.lang.Integer. object. java.util.LinkedHashMap. array. java.util.ArrayList. In this tutorial we will look at how to parse JSON in Java using different libraries. JSON stands for JavaScript Object Notation, and it is based on a subset of JavaScript. As a data-exchange format, it is widely used in web programming.

Comments
  • Which JSON library are you using and doesn't it already have a way to return Lists/Arrays?
  • Are you asking how to get profitarray":[[1,2,3],[67,88,99]] from the response ? How to get [[1,2,3],[67,88,99]] from the response ? or how to convert this [[1,2,3],[67,88,99]] from a String to arraylist of Integers ?
  • @c0der i amalready getting them from response ,I want to convert them to respective arraylist so as to save them in database
  • @vlaz JSon simple
  • I want to convert the string response in arraylist ,the response is stringified array right.
  • Is there a documentation for that? All I can find is this but it seems like the API is different - it's using JsonObject instead of JSONObject (different capitalisation). This is version 3, so perhaps it changed - I find some references to code using JSONObject but it seems to be for an earlier version some version 1 project points at a dead documentation source
  • Thanks for the observation. I have modified my answer for the same. By the by I had referred this: [oracle.com/technetwork/articles/java/json-1973242.html]
  • It dint work,I need ArrayList<ArrayList<Integer>> :(
  • array1 would not have worked but array2 would surely do. Isn't it?