How you iterate and add
for(int i=0;i<jsonArray.length;i++)
{
JSONObject json_data = jArray.getJSONObject(i);
imgnfo.id = json_data.getInt("id_key");
imgnfo.name = json_data.getString("name_key");
imgnfo.thumb = json_data.getString("thumb_key");
imgnfo.info = json_data.getString("info_key");
myArray.add(new image_data());
}
Just add proper keys names. I didn't know them.
Answer from Nikola Despotoski on Stack OverflowCoderanch
coderanch.com › t › 713115 › java › conversion-array-list-Json-object
conversion of array list to Json object string (Java in General forum at Coderanch)
July 19, 2019 - You need to create separate instances of JSONObject for each edge, not reuse the same one for both.
Top answer 1 of 2
6
How you iterate and add
for(int i=0;i<jsonArray.length;i++)
{
JSONObject json_data = jArray.getJSONObject(i);
imgnfo.id = json_data.getInt("id_key");
imgnfo.name = json_data.getString("name_key");
imgnfo.thumb = json_data.getString("thumb_key");
imgnfo.info = json_data.getString("info_key");
myArray.add(new image_data());
}
Just add proper keys names. I didn't know them.
2 of 2
2
Yo should post what the json data looks like. Assuming the json data looks something like
...,{
"image_data": {
"name": "image name","thumb":"thumbpath","path":"path"}
},{
"image_data": {
"name": "image name 2","thumb":"thumbpath 2","path":"path 2"}
}
Then you would extract the values like so:
ArrayList<image_data> imageArray = new ArrayList<image_data>();
for (int i=0; i<jsonArray.length(); i++) {
image_data img = new image_data();
Object jo = jsonArray.get(i);
image_data.name = jo.name;
image_data.thumb = jo.thumb;
image_data.path = jo.path;
imageArray.add(new image_data());
}
Consider using getters for you image_data class. Also consider renaming it to ImageData
java - Put ArrayList into param JsonObject - Stack Overflow
i must do i request with Volley Framework. This is a POST request with JSONObject. I must pass one string and one JSONArray..but how i can? I start with this: private String mUrl; private More on stackoverflow.com
java - Creating an ArrayList from a JSON Object - Stack Overflow
So I have a JSON just like the picture below stored as MYJSON-- My plan is to retrieve all the object from childObject0 and store them in an ArrayList so they can be processed later. So I did- Arr... More on stackoverflow.com
java - How to convert ArrayList to JSON object - Stack Overflow
ArrayList mylist = new ArrayList (); mylist.add("abc"); mylist.add("cfd"); mylist.add("ert"); mylist.add("fg"); mylist.add("ujk"); String json = new Gson().toJson(mylist); You can refer to the GSON User Guide for more support. ... Sign up to request clarification or add additional context in comments. ... i am trying to convert the array into json object... More on stackoverflow.com
Json object to java arraylist - Stack Overflow
1 (Gson) JSON to Java objects containing ArrayList More on stackoverflow.com
Reddit
reddit.com › r/androiddev › how do i save an arraylist with json?
r/androiddev on Reddit: How do I save an ArrayList<(Custom object here)> with JSON?
July 21, 2014 -
public class Semester {
private static final String JSON_ID = "id";
private static final String JSON_TITLE = "title";
private static final String JSON_CREDITS = "credits";
private static final String JSON_GPA = "gpa";
private static final String JSON_CUMULATIVECREDITS = "cumulativecredits";
private static final String JSON_CUMULATIVEGPA = "cumulativegpa";
private static final String JSON_COURSES = "courses";
private UUID id;
private String title;
private int credits;
private double GPA;
private int cumulativeCredits;
private double cumulativeGPA;private ArrayList<Course> courses;
public Semester() {
id = UUID.randomUUID();
courses = new ArrayList<Course>();
for (int i = 0; i < 6; i++) {
courses.add(new Course());
}
}
public Semester(JSONObject json) throws JSONException {
id = UUID.fromString(json.getString(JSON_ID));
title = json.getString(JSON_TITLE);
credits = json.getInt(JSON_CREDITS);
GPA = json.getDouble(JSON_GPA);
cumulativeCredits = json.getInt(JSON_CUMULATIVECREDITS);
cumulativeGPA = json.getDouble(JSON_CUMULATIVEGPA);//what do i put here?
}
public JSONObject toJSON() throws JSONException {
JSONObject json = new JSONObject();
json.put(JSON_ID, id.toString());
json.put(JSON_TITLE, title);
json.put(JSON_CREDITS, credits);
json.put(JSON_GPA, GPA);
json.put(JSON_CUMULATIVECREDITS, cumulativeCredits);
json.put(JSON_CUMULATIVEGPA, cumulativeGPA);JSONArray array = new JSONArray(courses);
json.put(JSON_COURSES, array);
return json; } .........
This is followed by a bunch of getters and setters for each private variable.
The first bolded item is the private ArrayList of a custom class that I made.
The second bolded item is what I need help with: how to retrieve the custom ArrayList just like the other variables.
Lastly, the third bolded item is my current idea of how to put an ArrayList into a JSONObject, but I don't know how to retrieve it. If there is another way, please tell me. Thank you.
Top answer 1 of 2
3
Gson gson = new Gson(); String jsonAsString = gson.toJson(arrayList); This doesn't make a JSON object, just a string in JSON format. Easier to keep up with (e.g. saving it in SharedPreferences). And to deserialize it from JSON... Type type = new TypeToken>(){}.getType(); ArrayList courses = gson.fromJson(jsonAsString, type); The GSON library is really one of the more useful tools Google has for this purpose.
2 of 2
2
use gson, it's going to make your life about 800 times easier.
Top answer 1 of 3
6
you need to make a JSON Array first and then store that
private String mUrl;
private ArrayList<String> mUrlDove;
HashMap<String, String> params = new HashMap<String, String>();
params.put("url", mUrl);
JSONArray jsArray = new JSONArray(mUrlDove);
params.put("urlDove", jsArray.toString());
mUrl = app.getInstance().getmUrlRestWS() + getString(R.string.path);
JsonObjectRequest mRequest = new JsonObjectRequest(
mUrl, new JSONObject(params),
createMyReqSuccessListener(),
createMyReqErrorListener()) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
return app.getInstance().createBasicAuthHeader();
}
};
2 of 3
5
try passing JSONObject instead of hashmap
JSONObject params = new JSONObject();
params.put("url", "www.secret.com");
JSONArray urlDove = new JSONArray();
urlDove.put("www.google.com");
urlDove.put("www.yahoo.com");
params.put("urlDove", urlDove);
JsonObjectRequest mRequest = new JsonObjectRequest(
mUrl, params,
createMyReqSuccessListener(),
createMyReqErrorListener()) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
return app.getInstance().createBasicAuthHeader();
}
};
for reference in parsing json https://stackoverflow.com/a/17810270/4810752
TutorialsPoint
tutorialspoint.com › how-can-we-add-a-jsonarray-to-jsonobject-in-java
How can we add a JSONArray to JSONObject in Java?
July 4, 2020 - We need to add a few items to an ArrayList first and pass this list to the put() method of JSONArray class and finally add this array to JSONObject using the put() method. import org.json.*; import java.util.*; public class AddJSONArrayToJSONObjTest ...
Crunchify
crunchify.com › json tutorials › in java how to convert arraylist to jsonobject?
In Java How to Convert ArrayList to JSONObject? • Crunchify
May 17, 2018 - Gson gson = gsonBuilder.create(); String JSONObject = gson.toJson(crunchify); log("\nConverted JSONObject ==> " + JSONObject); Gson prettyGson = new GsonBuilder().setPrettyPrinting().create(); String prettyJson = prettyGson.toJson(crunchify); log("\nPretty JSONObject ==> " + prettyJson); } private static void log(Object print) { System.out.println(print); } } Raw ArrayList ===> [Google, Facebook, Crunchify, Twitter, Snapchat, Microsoft] Converted JSONObject ==> ["Google","Facebook","Crunchify","Twitter","Snapchat","Microsoft"] Pretty JSONObject ==> [ "Google", "Facebook", "Crunchify", "Twitter", "Snapchat", "Microsoft" ] I hope you can use this simple utility to convert any Java Objects to JSONObject or JSONArray.
Top answer 1 of 5
23
You can use the GSON library to accomplish this.
ArrayList<String> mylist = new ArrayList<String> ();
mylist.add("abc");
mylist.add("cfd");
mylist.add("ert");
mylist.add("fg");
mylist.add("ujk");
String json = new Gson().toJson(mylist);
You can refer to the GSON User Guide for more support.
2 of 5
9
JSONArray jsArray = new JSONArray(mylist);
Or
Gson gson = new Gson();
String jsonArray = gson.toJson(mylist);
Get java-json.jar and Gson.jar here
Tabnine
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Code Library - Tabnine
July 25, 2024 - Get the answers and suggestions you need from our AI code assistant. Get started in minutes with a free 90 day trial of Tabnine Pro.
BeginnersBook
beginnersbook.com › 2024 › 06 › convert-json-array-to-arraylist-in-java
Convert JSON Array to ArrayList in Java
June 13, 2024 - import org.json.JSONArray; import ... jsonArray = new JSONArray(jsonArrayString); // Convert JSONArray to ArrayList ArrayList<JSONObject> arrayList = new ArrayList<>(); for (int i = 0; i < jsonArray.length(); i++) { arrayList.add(jsonArray.getJSONObject(i)); } // Print the ...
Javatpoint
javatpoint.com › how-to-convert-json-array-to-arraylist-in-java
How to Convert JSON Array to ArrayList in Java - Javatpoint
How to Convert JSON Array to ArrayList in Java with java tutorial, features, history, variables, object, programs, operators, oops concept, array, string, map, math, methods, examples etc.
Top answer 1 of 2
2
Create instance of JsonArray then add json element to that array using key.
Here is your solution :
Gson googleJson = new Gson();
JsonObject data = googleJson.fromJson(request.getReader(), JsonObject.class);
System.out.println(data);
JsonArray jsonArr = new JsonArray();
for(Entry<String, JsonElement> entry : data.entrySet()) {
jsonArr.add(data.get(entry.getKey()));
}
ArrayList jsonObjList = googleJson.fromJson(jsonArr, ArrayList.class);
for(int i = 0; i < jsonObjList.size(); i++) {
System.out.println(jsonObjList.get(i));
}
2 of 2
0
For a Json to be a valid JsonArray object you should have it to a proper format. Can you change your json string return from your ajax? If yes you should change it to something like this:
Gson googleJson = new Gson();
JsonObject data = googleJson.fromJson("{test: [{\"0\":\"31/01/2017\"},{\"1\":\"19/01/2017\"}]}", JsonObject.class);
System.out.println(data);
JsonArray jsonArr = data.getAsJsonArray("test");
ArrayList jsonObjList = googleJson.fromJson(jsonArr, ArrayList.class);
for(int i=0; i< jsonObjList.size(); i++) {
System.out.println(jsonObjList.get(i));
}
If not you should parse it by your self and convert it to everything you want.
Top answer 1 of 5
3
If you want to work with json go this library, this library has a nice support https://code.google.com/p/google-gson/.
This is an example:
Gson gson = new Gson();
Collection<Integer> ints = Lists.immutableList(1,2,3,4,5);
(Serialization)
String json = gson.toJson(ints); ==> json is [1,2,3,4,5]
Thanks
2 of 5
3
org.json and org.json.simple JSON parser use raw types of collections underneath. If you're looking for good Generics support try Google Gson. Here's how you would go about serializing your generic ArrayList with Gson:
Gson gson = new Gson();
ArrayList<String> arrayList= (ArrayList<String>) ClassName.getArrayList();
// Serializing to a JSON element node
JsonElement jsonElement = gson.toJsonTree(arrayList);
System.out.println(jsonElement.isJsonArray()); // true
// Or, directly to JSON string
String json = gson.toJson(arrayList);
System.out.println(json);
Here's how you would deserialize the same JSON string with its Generics intact:
Type type = new TypeToken<ArrayList<String>>(){}.getType();
ArrayList<String> arrayList = gson.fromJson(json, type);
Stack Overflow
stackoverflow.com › questions › 60019377 › how-to-make-a-arraylist-with-json-objects-in-java
How to make a Arraylist with JSON Objects in JAVA? - Stack Overflow
It's generally worth doing a search for common programming tasks. You could just google search "java add to list" which should result in something like: List<JSONObject> myList = new ArrayList<>(); myList.add(uptimeResponsObject);
YouTube
youtube.com › watch
Java json 01 create an arraylist to serialize with Jackson library - YouTube
Shows how to prepare an arraylist of a class. Preparing for use of a json library called Jackson. Part 1 of 3 for how to read and write json files using java
Published: January 29, 2019
Top answer 1 of 16
204
ArrayList<String> listdata = new ArrayList<String>();
JSONArray jArray = (JSONArray)jsonObject;
if (jArray != null) {
for (int i=0;i<jArray.length();i++){
listdata.add(jArray.getString(i));
}
}
2 of 16
85
I've done it using Gson (by Google).
Add the following line to your module's build.gradle:
dependencies {
// ...
// Note that `compile` will be deprecated. Use `implementation` instead.
// See https://stackoverflow.com/a/44409111 for more info
implementation 'com.google.code.gson:gson:2.8.2'
}
JSON string:
private String jsonString = "[\n" +
" {\n" +
" \"id\": \"c200\",\n" +
" \"name\": \"Ravi Tamada\",\n" +
" \"email\": \"ravi@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c201\",\n" +
" \"name\": \"Johnny Depp\",\n" +
" \"email\": \"johnny_depp@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c202\",\n" +
" \"name\": \"Leonardo Dicaprio\",\n" +
" \"email\": \"leonardo_dicaprio@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c203\",\n" +
" \"name\": \"John Wayne\",\n" +
" \"email\": \"john_wayne@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c204\",\n" +
" \"name\": \"Angelina Jolie\",\n" +
" \"email\": \"angelina_jolie@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c205\",\n" +
" \"name\": \"Dido\",\n" +
" \"email\": \"dido@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c206\",\n" +
" \"name\": \"Adele\",\n" +
" \"email\": \"adele@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c207\",\n" +
" \"name\": \"Hugh Jackman\",\n" +
" \"email\": \"hugh_jackman@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c208\",\n" +
" \"name\": \"Will Smith\",\n" +
" \"email\": \"will_smith@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c209\",\n" +
" \"name\": \"Clint Eastwood\",\n" +
" \"email\": \"clint_eastwood@gmail.com\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",TutorialsPoint
tutorialspoint.com › article › how-to-convert-java-array-or-arraylist-to-jsonarray-using-gson-in-java
How to convert Java array or ArrayList to JsonArray using Gson in Java?
July 8, 2020 - import com.google.gson.*; import java.util.*; public class JavaArrayToJsonArrayTest { public static void main(String args[]) { String[][] strArray = {{"elem1-1", "elem1-2"}, {"elem2-1", "elem2-2"}}; ArrayList<ArrayList<String>> arrayList = new ArrayList<>(); for(int i = 0; i < strArray.length; i++) { ArrayList<String> nextElement = new ArrayList<>(); for(int j = 0; j < strArray[i].length; j++) { nextElement.add(strArray[i][j] + "-B"); } arrayList.add(nextElement); } JsonObject jsonObj = new JsonObject(); // array to JsonArray JsonArray jsonArray1 = new Gson().toJsonTree(strArray).getAsJsonArray(); // ArrayList to JsonArray JsonArray jsonArray2 = new Gson().toJsonTree(arrayList).getAsJsonArray(); jsonObj.add("jsonArray1", jsonArray1); jsonObj.add("jsonArray2", jsonArray2); System.out.println(jsonObj.toString()); } }
YouTube
youtube.com › watch
Java JSON Array Encode Using ArrayList - YouTube
#JavaJSONArray #HomeStay #StaySafe #ArrayList #JSONArrayListJava JSON ArrayList Encode0:05 JSON Install1:53 JSON Array Example Start time:Like, Share, And Su...
Published: April 7, 2020
Top answer 1 of 4
8
You coud use Gson library, that handles lists properly, instead.
Usage example:
class BagOfPrimitives {
private int value1;
private String value2;
private transient int value3;
public BagOfPrimitives(int value1, String value2, int value3) {
this.value1 = value1;
this.value2 = value2;
this.value3 = value3;
}
}
BagOfPrimitives obj1 = new BagOfPrimitives(1, "abc", 3);
BagOfPrimitives obj2 = new BagOfPrimitives(32, "gawk", 500);
List<BagOfPrimitives> list = Arrays.asList(obj1, obj2);
Gson gson = new Gson();
String json = gson.toJson(list);
// Now json is [{"value1":1,"value2":"abc"},{"value1":32,"value2":"gawk"}]
2 of 4
1
You could override the toString method in your Site class to return new JSONObject(this).toString