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));
}
}
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 - We can convert an array or ArrayList to JsonArray using the toJsonTree().getAsJsonArray() method of Gson class. public JsonElement toJsonTree(java.lang.Object src) import com.google.gson.*; import java.util.*; public class JavaArrayToJsonArrayTest ...
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));
}
}
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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\", Top answer 1 of 8
117
If you want or need to work with a Java array then you can always use the java.util.Arrays utility classes' static asList() method to convert your array to a List.
Something along those lines should work.
String mStringArray[] = { "String1", "String2" };
JSONArray mJSONArray = new JSONArray(Arrays.asList(mStringArray));
Beware that code is written offhand so consider it pseudo-code.
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40
ArrayList<String> list = new ArrayList<String>();
list.add("blah");
list.add("bleh");
JSONArray jsArray = new JSONArray(list);
This is only an example using a string arraylist
GitHub
gist.github.com › 21ec4a3a1fe9dc52e2cd195479428f98
JAVA array or ArrayList to JsonArray (Gson) · GitHub
JAVA array or ArrayList to JsonArray (Gson). GitHub Gist: instantly share code, notes, and snippets.
Top answer 1 of 9
138
If I read the JSONArray constructors correctly, you can build them from any Collection (arrayList is a subclass of Collection) like so:
ArrayList<String> list = new ArrayList<String>();
list.add("foo");
list.add("baar");
JSONArray jsArray = new JSONArray(list);
References:
- jsonarray constructor: http://developer.android.com/reference/org/json/JSONArray.html#JSONArray%28java.util.Collection%29
- collection: http://developer.android.com/reference/java/util/Collection.html
2 of 9
77
Use Gson library to convert ArrayList to JsonArray.
Gson gson = new GsonBuilder().create();
JsonArray myCustomArray = gson.toJsonTree(myCustomList).getAsJsonArray();
Coderanch
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 - programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums · this forum made possible by our volunteer staff, including ... ... Hi I have two lists Edge1List and Edge2List which I add to element on them. Edge1List:[o,p] and Edge2List: [p,null]. I convert Edge1List and Edge2List to JsonArray with the name of EdgeJsonArray1 and EdgeJsonArray2 respectively.
BeginnersBook
beginnersbook.com › 2024 › 06 › convert-json-array-to-arraylist-in-java
Convert JSON Array to ArrayList in Java
June 13, 2024 - The jsonArrayString is the JSON array in string form. The object of JSONArray is created by passing jsonArrayString in the constructor of JSONArray class. The ArrayList that we have created is of JSONObject type, each element of this ArrayList represents the element of JSONArray.
TutorialsPoint
tutorialspoint.com › how-can-we-convert-a-list-to-the-json-array-in-java
How to convert a List to JSON array using the Jackson library in Java?
April 22, 2025 - import java.util.*; import com.fasterxml.jackson.databind.*; import com.fasterxml.jackson.databind.node.ArrayNode; public class ListToJSONArrayUsingArrayNode { public static void main(String[] args) { List < String > list = Arrays.asList("JAVA", "PYTHON", "SCALA", ".NET", "TESTING"); ObjectMapper objectMapper = new ObjectMapper(); ArrayNode arrayNode = objectMapper.createArrayNode(); for (String item: list) { arrayNode.add(item); // adding each item manually } try { String jsonArray = objectMapper.writeValueAsString(arrayNode); System.out.println(jsonArray); } catch (Exception e) { e.printStackTrace(); } } }
Baeldung
baeldung.com › home › java › java list › converting a java list to a json array
Converting a Java List to a Json Array | Baeldung
June 18, 2025 - @Test public void given_JavaLi... passing the articles List as a parameter. The JSONArray class provides a toString() method to obtain the JSON array as a string representation....
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 - package crunchify.com.tutorial; import java.util.ArrayList; import com.google.gson.Gson; import com.google.gson.GsonBuilder; /** * @author Crunchify.com * Program: Best way to convert Java ArrayList to JSONObject * Version: 1.0.0 * */ public class CrunchifyArrayListToJsonObject { public static void main(String a[]) { ArrayList<String> crunchify = new ArrayList<String>(); crunchify.add("Google"); crunchify.add("Facebook"); crunchify.add("Crunchify"); crunchify.add("Twitter"); crunchify.add("Snapchat"); crunchify.add("Microsoft"); log("Raw ArrayList ===> " + crunchify); // Use this builder to construct a Gson instance when you need to set configuration options other than the default.
Top answer 1 of 2
4
JSONArray att = new JSONArray(YourList);
2 of 2
3
You can use Gson to convert List<String> to JSON
List<String> listStrings = new ArrayList<String>();
listStrings.add("a");
listStrings.add("b");
Gson objGson = new Gson();
System.out.println(objGson.toJson(listStrings));
Output
["a","b"]
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.
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9
JSONArray jsArray = new JSONArray(mylist);
Or
Gson gson = new Gson();
String jsonArray = gson.toJson(mylist);
Get java-json.jar and Gson.jar here
GeeksforGeeks
geeksforgeeks.org › java › how-to-convert-an-arraylist-of-objects-to-a-json-array-in-java
How to Convert an ArrayList of Objects to a JSON Array in Java? - GeeksforGeeks
July 23, 2025 - package org.example; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import java.util.ArrayList; import java.util.List; public class Main { public static void main(String[] args) { // Create an ArrayList of objects List<Course> courses = new ArrayList<>(); courses.add( new Course(1, "Java", "25000", "3 Months")); courses.add( new Course(2, "C++", "20000", "3 Months")); // Convert the ArrayList to a JSON array ObjectMapper objectMapper = new ObjectMapper(); try { String jsonArray = objectMapper.writeValueAsString(courses); System.out.println(jsonArray); } catch (JsonProcessingException e) { e.printStackTrace(); } } }
IQCode
iqcode.com › code › javascript › arraylist-to-json-array
arraylist to json array Code Example
September 5, 2021 - ArrayList<String> list = new ArrayList<String>(); list.add("foo"); list.add("baar"); JSONArray jsArray = new...
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
19
To convert ArrayList to Json, just download Open Source json utility from: http://json.org/java/ or Jar file from here
And just do:
JSONArray jsonAraay = new JSONArray(your_array_list);
That's it
Note: You should have setter/getter in your POJO/MODEL class to convert arraylist to json
2 of 4
1
Don't bother with org.json, use Jackson all the way:
// list is a List<MyData>
final ObjectMapper mapper = new ObjectMapper();
final Map<String, MyData> map = new HashMap<>();
for (final MyData data: list)
map.put(data.fname, data);
final JsonNode json = mapper.valueToTree(map);
Top answer 1 of 16
196
ArrayList<String> list = new ArrayList<String>();
JSONArray jsonArray = (JSONArray)jsonObject;
if (jsonArray != null) {
int len = jsonArray.length();
for (int i=0;i<len;i++){
list.add(jsonArray.get(i).toString());
}
}
2 of 16
63
If you don't already have a JSONArray object, call
JSONArray jsonArray = new JSONArray(jsonArrayString);
Then simply loop through that, building your own array. This code assumes it's an array of strings, it shouldn't be hard to modify to suit your particular array structure.
List<String> list = new ArrayList<String>();
for (int i=0; i<jsonArray.length(); i++) {
list.add( jsonArray.getString(i) );
}
GeeksforGeeks
geeksforgeeks.org › java › convert-an-arraylist-into-a-json-string-in-java
How to Convert an ArrayList into a JSON String in Java? - GeeksforGeeks
July 23, 2025 - It creates an ArrayList of type String and adds 3 course names to it. It uses the ObjectMapper from Jackson to convert the ArrayList to a JSON string.
Java Guides
javaguides.net › 2019 › 07 › convert-list-to-json-array-using-jackson.html
Convert List to JSON Array Using Jackson
July 21, 2019 - ObjectMapper mapper = new ObjectMapper(); mapper.enable(SerializationFeature.INDENT_OUTPUT); List < String > progLangs = new ArrayList < > (); progLangs.add("C"); progLangs.add("C++"); progLangs.add("Java"); progLangs.add("Java EE"); progLangs.add("Python"); progLangs.add("Scala"); progLangs.add("JavaScript"); // Serialize Object to JSON.
Top answer 1 of 2
3
If it is only an array of string you want, you can use the below - List currentGroupIdsList = new ArrayList(Arrays.asList(stringifiedArray.split(",")));Here stringifiedArray is received from the frontend and converted into simple of strings.Hope this helps!
2 of 2
2
Try .fromJson(arrayOfStrings, JsonArray,class) instead of converting it into JsonObject.class