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));
}
}
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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"[email protected]\",\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\": \"c2010\",\n" +
" \"name\": \"Barack Obama\",\n" +
" \"email\": \"[email protected]\",\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\": \"c2011\",\n" +
" \"name\": \"Kate Winslet\",\n" +
" \"email\": \"[email protected]\",\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\": \"c2012\",\n" +
" \"name\": \"Eminem\",\n" +
" \"email\": \"[email protected]\",\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" +
" ]";
ContactModel.java:
public class ContactModel {
public String id;
public String name;
public String email;
}
Code for converting a JSON string to ArrayList<Model>:
Note: You have to import java.lang.reflect.Type;:
// Top of file
import java.lang.reflect.Type;
// ...
private void parseJSON() {
Gson gson = new Gson();
Type type = new TypeToken<List<ContactModel>>(){}.getType();
List<ContactModel> contactList = gson.fromJson(jsonString, type);
for (ContactModel contact : contactList){
Log.i("Contact Details", contact.id + "-" + contact.name + "-" + contact.email);
}
}
Hope this will help you.
Baeldung
baeldung.com › home › json › jackson › convert json array to java list
Convert JSON Array to Java List | Baeldung
August 13, 2025 - Then, we use the fromJson() method of the Gson object to convert the JSON array String to a List.
Videos
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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) );
}
Mkyong
mkyong.com › home › java › how to parse json array with jackson
How to parse JSON Array with Jackson - Mkyong.com
April 23, 2024 - In Jackson, we can convert the JSON array to an Array or List. ... package com.mkyong.json.jackson; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.ObjectMapper; import com.mkyong.json.model.Person; import java.util.List; public class JsonArrayToObjectExample { public static void main(String[] args) throws JsonProcessingException { String jsonArray = "[{\"name\":\"mkyong\", \"age\":42}, {\"name\":\"ah pig\", \"age\":20}]"; ObjectMapper mapper = new ObjectMapper(); // 1.
TutorialsPoint
tutorialspoint.com › how-can-we-convert-a-json-array-to-a-list-using-jackson-in-java
How can we convert a JSON array to a list using Jackson in Java?\\n
June 5, 2025 - import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.ObjectMapper; import java.util.List; import java.io.IOException; import java.util.ArrayList; public class JsonArrayToList{ public static void main(String[] args) { String jsonArray = "[{"name":"John","age":30},{"name":"Jane","age":25}]"; ObjectMapper objectMapper = new ObjectMapper(); try { List<Person> personList = objectMapper.readValue(jsonArray, new TypeReference<List<Person>>(){}); for (Person person : personList) { System.out.println("Name: " + person.getName() + ", Age: " + person.getAge()); } }
How to do in Java
howtodoinjava.com › home › convert json array to list: gson, jackson and org.json
Convert JSON Array to List: Gson, Jackson and Org.json
September 25, 2023 - Learn to use Gson, Jackson, and Org.json libraries to convert a JSON array into an ArrayList of objects with easy-to-understand examples.
Java Code Geeks
javacodegeeks.com › home › core java
Converting JSON Array to Java List with Gson - Java Code Geeks
April 25, 2024 - We parse a JSON array into a JsonArray using Gson’s JsonParser. Then, we iterate over each element of the array, converting them into Java objects using Gson’s fromJson() method. Finally, we add each Java object to a List.
Top answer 1 of 5
4
There are two problems with your code :
- First is that you are using a
getJsonArray()to get the array, which isn't part of Gson library, you need to use getAsJsonArray() method instead. - Second is that you are using
array.toString()which isn't obvious because for thefromJsonmethod you need ajsonArrayas parameter and notStringand that will cause you parse problems, just remove it.
And use the following code to convert your jsonArray to List<Noticia> :
Type type = new TypeToken<List<Noticia>>() {}.getType();
List<Noticia> lista = gson.fromJson(array, type);
And your whole code will be:
Gson gson = new Gson();
JSONArray array = obj.getAsJsonArray("result");
Type type = new TypeToken<List<Noticia>>() {}.getType();
List<Noticia> lista = gson.fromJson(array, type);
//testing - size = 2 but value Titulo is null
Log.i("LISTSIZE->", lista.size() +"");
for(Noticia n:lista){
Log.i("TITULO", n.getTitulo());
}
2 of 5
1
I think the problem could be something to do with toString() on JSONArray. But are you using obj.getAsJsonArray method?
Try this:
JSONArray arr = obj.getAsJsonArray("result");
Type listType = new TypeToken<List<Noticia>>() {
}.getType();
return new Gson().fromJson(arr , listType);
Stack Abuse
stackabuse.com › converting-json-array-to-a-java-array-or-list
Convert JSON Array to a Java Array or List with Jackson
September 8, 2020 - In this article, we'll convert a JSON array into a Java Array and Java List using Jackson.
HowToDoInJava
howtodoinjava.com › home › gson › gson – parse json array to java array or list
Gson - Parse JSON Array to Java Array or List
April 4, 2023 - Learn to use Google GSON library to deserialize or convert JSON, containing JSON array as root or member, to Java Array or List of objects.
Top answer 1 of 6
321
Definitely the easiest way to do that is using Gson's default parsing function fromJson().
There is an implementation of this function suitable for when you need to deserialize into any ParameterizedType (e.g., any List), which is fromJson(JsonElement json, Type typeOfT).
In your case, you just need to get the Type of a List<String> and then parse the JSON array into that Type, like this:
import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;
JsonElement yourJson = mapping.get("servers");
Type listType = new TypeToken<List<String>>() {}.getType();
List<String> yourList = new Gson().fromJson(yourJson, listType);
In your case yourJson is a JsonElement, but it could also be a String, any Reader or a JsonReader.
You may want to take a look at Gson API documentation.
2 of 6
19
Below code is using com.google.gson.JsonArray.
I have printed the number of element in list as well as the elements in List
import java.util.ArrayList;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
public class Test {
static String str = "{ "+
"\"client\":\"127.0.0.1\"," +
"\"servers\":[" +
" \"8.8.8.8\"," +
" \"8.8.4.4\"," +
" \"156.154.70.1\"," +
" \"156.154.71.1\" " +
" ]" +
"}";
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
JsonParser jsonParser = new JsonParser();
JsonObject jo = (JsonObject)jsonParser.parse(str);
JsonArray jsonArr = jo.getAsJsonArray("servers");
//jsonArr.
Gson googleJson = new Gson();
ArrayList jsonObjList = googleJson.fromJson(jsonArr, ArrayList.class);
System.out.println("List size is : "+jsonObjList.size());
System.out.println("List Elements are : "+jsonObjList.toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
OUTPUT
List size is : 4
List Elements are : [8.8.8.8, 8.8.4.4, 156.154.70.1, 156.154.71.1]
Google Groups
groups.google.com › g › vertx › c › 5fgz-e2rTbk
casting a JsonArray to a specific type
I think that should do it and return a Set<String>. Modify the map() call to convert each object to the type you want the generic set to specialize on. The Java 8 Stream API, in combination with lambdas, is so useful. ... Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message ... In case someone is interested, when it is a more complex type. JsonArray jarr = new JsonArray(messageAsyncResult.result().bodyAsString()); List<Customer> cl = (List<Customer>) jarr.getList().stream().map(s ->
Top answer 1 of 16
78
Take a look at this tutorial. Also you can parse above json like :
JSONArray arr = new JSONArray(yourJSONresponse);
List<String> list = new ArrayList<String>();
for(int i = 0; i < arr.length(); i++){
list.add(arr.getJSONObject(i).getString("name"));
}
2 of 16
34
Simplest and correct code is:
public static String[] toStringArray(JSONArray array) {
if(array==null)
return new String[0];
String[] arr=new String[array.length()];
for(int i=0; i<arr.length; i++) {
arr[i]=array.optString(i);
}
return arr;
}
Using List<String> is not a good idea, as you know the length of the array.
Observe that it uses arr.length in for condition to avoid calling a method, i.e. array.length(), on each loop.
Attacomsian
attacomsian.com › blog › jackson-convert-json-array-to-from-java-list
Convert JSON array to a list using Jackson in Java
November 6, 2022 - In this short tutorial, you'll learn how to use the Jackson library to convert a JSON array string into a list of Java Objects and vice versa.
Stack Overflow
stackoverflow.com › questions › 13171540 › easiest-and-most-efficient-way-to-convert-jsonarray-to-list
java - Easiest and most efficient way to convert JSONArray to List - Stack Overflow
What is the easiest and most efficient way to convert org.json.JSONArray to List? ... FYI, net.sf.JSONArray implements java.util.List.
Blogger
javarevisited.blogspot.com › 2013 › 04 › convert-json-array-to-string-array-list-java-from.html
How to Convert JSON array to String array in Java - GSon example
We have seen an example of converting JSON String array to List of String and String array in Java, similarly converting numeric JSON array to List of Integer and integer array in Java. The GSON library from Google provides a very convenient method like toJson() and fromJSon() which just need type information to perform a conversion between JSON and Java. Other JSON tutorials you may like to explore · How to convert a JSON String to POJO in Java?
Attacomsian
attacomsian.com › blog › gson-convert-json-array-to-from-java-list
Convert JSON Array to List using Gson in Java
October 14, 2022 - In this quick tutorial, you'll learn how to use the Gson library to convert a JSON array string into a list of Java Objects and vice versa. To add Gson to your Gradle project, add the following dependency to the build.gradle: implementation ...
Coderanch
coderanch.com › t › 697439 › java › convert-JSON-Array-arraylist
how to convert JSON Array to arraylist (Java in General forum at Coderanch)
August 2, 2018 - Here's the JSON Array that i've received : [{"FOODID":"Jus Alpukat","PRICE":"7000","NUM":"1","RES":"7000.0","ORDERID_FK":""},{"FOODID":"Ice Cream","PRICE":"5000","NUM":"10","RES":"50000.0","ORDERID_FK":""}] i need it to be converted into arraylist that will be inserted into JTable into java.
BeginnersBook -
beginnersbook.com › home › java › convert json array to arraylist in java
Convert JSON Array to ArrayList in Java
June 13, 2024 - 2. Parse the JSON Array and Convert ... \"age\":34}]"; // Convert JSON array to JSONArray JSONArray jsonArray = new JSONArray(jsonArrayString); // Convert JSONArray to ArrayList ArrayList<JSONObject> arrayList = new ArrayList<>(); for (int i = 0; i < jsonArray.length(); i++) { ...