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.
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Stack Overflow
stackoverflow.com › questions › 45909583 › convert-jsonobjects-to-arraylist
java - convert JSONObjects to ArrayList - Stack Overflow
For example, something like the following: class GeoPoint { private double lat; private double lon; public GeoPoint( double lat, double lon ) { this.lat = lat this.lon = lon } // ... } ArrayList<GeoPoint> list = new ArrayList<>(); // Thankfully ...
Javatpoint
javatpoint.com › how-to-convert-json-array-to-arraylist-in-java
How to Convert JSON Array to ArrayList in Java - Javatpoint
January 3, 2025 - 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.
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 - The following code parses a JSON array containing person data and converts it into a list of Java Person objects using the JSONArray and JSONObject classes. JSONArray represents the array of person objects in the JSON. JSONObject represents a person object in the JSON. List<Person> readPersonListFromJsonArray(String json) { JSONArray jsonArray = new JSONArray(json); List<Person> personList = new ArrayList<>(); for (int i = 0; i < jsonArray.length(); i++) { JSONObject jsonPerson = jsonArray.getJSONObject(i); long id = jsonPerson.getLong("id"); String name = jsonPerson.getString("name"); int age = jsonPerson.getInt("age"); Person person = new Person(id, name, age); personList.add(person); } return personList; }
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 - Following is the code that provides an example of how to convert a JSON array to a list using Jackson in Java: 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 (Pe
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 ... JSONArray 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)); } // ...
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 - Without using TypeReference<>, which is advised, you can convert the array into a list with any other approach at your disposal, such as: List<Language> langList = new ArrayList(Arrays.asList(langs)); ... Check out our hands-on, practical guide to learning Git, with best-practices, ...
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 - Java in General · Melody Putri · Greenhorn · Posts: 1 · posted 7 years ago · Number of slices to send: Optional 'thank-you' note: Send · Hi, I'm receiving data in form of JSON Array. 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.
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) );
}
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
Baeldung
baeldung.com › home › json › jackson › convert json array to java list
Convert JSON Array to Java List | Baeldung
August 13, 2025 - Learn how to convert a JSON array to a Java List using the popular Gson and Jackson libraries.
Top answer 1 of 2
3
It is not specified, which JSON parser do you use, so I suppose you can choose right now and I'll suggest using Gson as such.
The better solution for deserializing such a structures is creating a special class for each structure, for example:
public class NameURIPair {
private String name;
private String URI;
// getters
}
Then your JSON can be deserialized into a class, which holds the resulting List in it:
public class Data {
private List<NameURIPair> output;
// getter
}
// ...
Data data = new Gson(stringData, Data.class);
Since you've requested the other way, you still can get just the parsed JSON into JsonElement with JsonParser
JsonElement root = new JsonParser().parse(stringData);
Although I won't give you the full solution not to appreciate this kind of solutions :-)
2 of 2
2
Aazelix, your Json output seem to be missing opening array bracket. Its correct form is listed below:
{"output":[{"name":"Name3","URI":"Value3"},{"name":"Name5","URI":"Value5"},{"name":"Name4","URI":"Value4"}]}
As for the conversion to POJO
List<MyObj> list = new ArrayList<>();
if (outputs!= null) {
int len = outputs.length();
for (int i=0; i<len; i++) {
JSONObject o = (JSONObject) outputs.get(i);
list.add(new MyObj(o.getString('name'), o.getString('URL')));
}
}
System.out.println("There is " + list.size() + " objects.");
public static final class MyObj {
final String name;
final String url;
public MyObj(String name, String url) {
this.name = name;
this.url = url;
}
}
Tabnine
tabnine.com › home page › code › java › org.json.jsonarray
org.json.JSONArray.toList java code examples | Tabnine
November 2, 2015 - * If an element in the array is a JSONArray or JSONObject it will also * be converted. * <p> * Warning: This method assumes that the data structure is acyclical. * * @return a java.util.List containing the elements of this array */ public List<Object> toList() { List<Object> results = new ArrayList<Object>(this.myArrayList.size()); for (Object element : this.myArrayList) { if (element == null || JSONObject.NULL.equals(element)) { results.add(null); } else if (element instanceof JSONArray) { results.add(((JSONArray) element).toList()); } else if (element instanceof JSONObject) { results.add(((JSONObject) element).toMap()); } else { results.add(element); } } return results; } }
Stack Overflow
stackoverflow.com › questions › 45920698 › convert-jsonobject-to-arraylist
java - convert jsonObject to arraylist - Stack Overflow
August 28, 2017 - JSONArray arr = jsonObject.getJSONArray("hits"); for (int i = 0; i < arr.length(); i++) { String geoloc = arr.getJSONObject(i).getString("_geoloc"); Log.d("geoloc"," : " + geoloc); }
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 - Edge1List:[o,p] and Edge2List: [p,null]. I convert Edge1List and Edge2List to JsonArray with the name of EdgeJsonArray1 and EdgeJsonArray2 respectively. I want to show that o from EdgeJsonArray1 is connect to p from EdgeJsonArray2 and p from EdgeJsonArray1 is connected to null from EdgeJsonArray2 which is I put them in a Jsonobject name as EdgeJsonObjsub with different key.
Java Code Geeks
javacodegeeks.com › home › core java
Converting JSON Array to Java List with Gson - Java Code Geeks
April 25, 2024 - This method entails manual traversal of the JSON array, with each element converted into a Java object. Here’s a practical implementation: String json = "[{\"name\":\"John\"},{\"name\":\"Doe\"}]"; JsonArray jsonArray = JsonParser.parseString(json).getAsJsonArray(); List<MyObject> list = new ArrayList<>(); for (JsonElement element : jsonArray) { MyObject obj = new Gson().fromJson(element, MyObject.class); list.add(obj); } We parse a JSON array into a JsonArray using Gson’s JsonParser.
Top answer 1 of 5
98
The problem is not in your code but in your json:
{"Compemployes":[{"id":1001,"name":"jhon"}, {"id":1002,"name":"jhon"}]}
this represents an object which contains a property Compemployes which is a list of Employee. In that case you should create that object like:
class EmployeList{
private List<Employe> compemployes;
(with getter an setter)
}
and to deserialize the json simply do:
EmployeList employeList = mapper.readValue(jsonString,EmployeList.class);
If your json should directly represent a list of employees it should look like:
[{"id":1001,"name":"jhon"}, {"id":1002,"name":"jhon"}]
Last remark:
List<Employee> list2 = mapper.readValue(jsonString,
TypeFactory.collectionType(List.class, Employee.class));
TypeFactory.collectionType is deprecated you should now use something like:
List<Employee> list = mapper.readValue(jsonString,
TypeFactory.defaultInstance().constructCollectionType(List.class,
Employee.class));
2 of 5
1
/*
It has been answered in http://stackoverflow.com/questions/15609306/convert-string-to-json-array/33292260#33292260
* put string into file jsonFileArr.json
* [{"username":"Hello","email":"[email protected]","credits"
* :"100","twitter_username":""},
* {"username":"Goodbye","email":"[email protected]"
* ,"credits":"0","twitter_username":""},
* {"username":"mlsilva","email":"[email protected]"
* ,"credits":"524","twitter_username":""},
* {"username":"fsouza","email":"[email protected]"
* ,"credits":"1052","twitter_username":""}]
*/
public class TestaGsonLista {
public static void main(String[] args) {
Gson gson = new Gson();
try {
BufferedReader br = new BufferedReader(new FileReader(
"C:\\Temp\\jsonFileArr.json"));
JsonArray jsonArray = new JsonParser().parse(br).getAsJsonArray();
for (int i = 0; i < jsonArray.size(); i++) {
JsonElement str = jsonArray.get(i);
Usuario obj = gson.fromJson(str, Usuario.class);
//use the add method from the list and returns it.
System.out.println(obj);
System.out.println(str);
System.out.println("-------");
}
} catch (IOException e) {
e.printStackTrace();
}
}