Convert JSONArray to String Array

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"));
}

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.

public static String[] getStringArray(JSONArray jsonArray) {
 String[] stringArray = null;
 if (jsonArray != null) {
 int length = jsonArray.length();
 stringArray = new String[length];
 for (int i = 0; i < length; i++) {
 stringArray[i] = jsonArray.optString(i);
 }
 }
 return stringArray;
}

TERRIBLE TERRIBLE TERRIBLE hack:

String[] arr = jsonArray.toString().replace("},{", " ,").split(" ");

You can loop to create the String

List<String> list = new ArrayList<String>();
for (int i=0; i<jsonArray.length(); i++) {
 list.add( jsonArray.getString(i) );
}
String[] stringArray = list.toArray(new String[list.size()]);

Was trying one of the same scenario but found one different and simple solution to convert JSONArray into List.

import java.lang.reflect.Type;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
String jsonStringArray = "[\"JSON\",\"To\",\"Java\"]"; 
 
//creating Gson instance to convert JSON array to Java array
 
 Gson converter = new Gson(); 
 Type type = new TypeToken<List<String>>(){}.getType();
 List<String> list = converter.fromJson(jsonStringArray, type );

Give a try

Here is the code :

// XXX satisfies only with this particular string format
 String s = "[{\"name\":\"IMG_20130403_140457.jpg\"},{\"name\":\"IMG_20130403_145006.jpg\"},{\"name\":\"IMG_20130403_145112.jpg\"},{\"name\":\"IMG_20130404_085559.jpg\"},{\"name\":\"IMG_20130404_113700.jpg\"},{\"name\":\"IMG_20130404_113713.jpg\"},{\"name\":\"IMG_20130404_135706.jpg\"},{\"name\":\"IMG_20130404_161501.jpg\"},{\"name\":\"IMG_20130405_082413.jpg\"},{\"name\":\"IMG_20130405_104212.jpg\"},{\"name\":\"IMG_20130405_160524.jpg\"},{\"name\":\"IMG_20130408_082456.jpg\"},{\"name\":\"test.jpg\"}]";
 s = s.replace("[", "").replace("]", "");
 s = s.substring(1, s.length() - 1);
 String[] split = s.split("[}][,][{]");
 for (String string : split) {
 System.out.println(string);
 }

The below code will convert JSON array to List

For example;

import org.json.JSONArray
String data = "YOUR_JSON_ARRAY_DATA";
JSONArray arr = new JSONArray(data);
List<String> list = arr.toList().stream().map(Object::toString).collect(Collectors.toList());

There you go:

String tempNames = jsonObj.names().toString(); 
String[] types = tempNames.substring(1, tempNames.length()-1).split(","); //remove [ and ] , then split by ','

Using only the portable JAVA API. http://www.oracle.com/technetwork/articles/java/json-1973242.html

 try (JsonReader reader = Json.createReader(new StringReader(yourJSONresponse))) {
 JsonArray arr = reader.readArray();
 List<String> l = arr.getValuesAs(JsonObject.class)
 .stream().map(o -> o.getString("name")).collect(Collectors.toList());
 }

A ready-to-use method:

/**
* Convert JSONArray to ArrayList<String>.
* 
* @param jsonArray JSON array.
* @return String array.
*/
public static ArrayList<String> toStringArrayList(JSONArray jsonArray) {
 ArrayList<String> stringArray = new ArrayList<String>();
 int arrayIndex;
 JSONObject jsonArrayItem;
 String jsonArrayItemKey;
 for (
 arrayIndex = 0;
 arrayIndex < jsonArray.length();
 arrayIndex++) {
 try {
 jsonArrayItem =
 jsonArray.getJSONObject(
 arrayIndex);
 jsonArrayItemKey =
 jsonArrayItem.getString(
 "name");
 stringArray.add(
 jsonArrayItemKey);
 } catch (JSONException e) {
 e.printStackTrace();
 }
 }
 return stringArray;
}

Bit late for an answer, but here's what I came up with using Gson:

for a jsonarray foo: [{"test": "bar"}, {"test": "bar2"}]

JsonArray foo = getJsonFromWherever();
String[] test = new String[foo.size()]
foo.forEach(x -> {test = ArrayUtils.add(test, x.get("test").getAsString());});

I do post an answer here for the question here that was closed even though the asnwers here helped, but were not sufficient.

So, this is in order to get a json array to a String[] using jsonsimple.

According to the (marvelous) decode examples and docs, JSONArrays are java List, so we can access List methods.

From there, is it possible to transform it to a String[] with the following:

 JSONObject assemblingTags = (JSONObject) obj.get("assembling-tags");
 JSONArray aTagsList = (JSONArray) assemblingTags.get("list");
 String[] tagsList = (String[]) aTagsList.stream().toArray(String[]::new);

And here is my solution, You may want to convert and merge more than a single array :

public static String[] multiJsonArrayToSingleStringArray(JSONArray... arrays) {
 ArrayList<String> list=new ArrayList<>();
 for (JSONArray array : arrays)
 for (int i = 0; i < array.length(); i++)
 list.add(array.optString(i));
 return list.toArray(new String[list.size()]);
}

I know this is probably late. I hope it will help someone.

When you have a string array that is stringfied. say something like this

String chars = "["a","b","c"]";// Json stringfied string
List<String>charArray = (List<String>) JSON.parse(chars);
String[] stringArray = cars.toArray(new String[char.size()]);

There you go the array has something like this

 stringarray = ["a","b","c"];

You can input json array to this function get output as string array

example Input - { "gender" : ["male", "female"] }

output - {"male", "female"}

private String[] convertToStringArray(Object array) throws Exception {
 return StringUtils.stripAll(array.toString().substring(1, array.toString().length()-1).split(","));
}

The below code will convert the JSON array of the format

[{"version":"70.3.0;3"},{"version":"6R_16B000I_J4;3"},{"version":"46.3.0;3"},{"version":"20.3.0;2"},{"version":"4.1.3;0"},{"version":"10.3.0;1"}]

to List of String

[70.3.0;3, 6R_16B000I_J4;3, 46.3.0;3, 20.3.0;2, 4.1.3;0, 10.3.0;1]

Code :

ObjectMapper mapper = new ObjectMapper(); ArrayNode node = (ArrayNode)mapper.readTree(dataFromDb); data = node.findValuesAsText("version"); // "version" is the node in the JSON

and use com.fasterxml.jackson.databind.ObjectMapper

You might want to take a look at JSONArray.toList(), which returns a List containing Maps and Lists, which represent your JSON structure. So you can use it with Java Streams like this:

JSONArray array = new JSONArray(jsonString);
List<String> result = array.toList().stream()
 .filter(Map.class::isInstance)
 .map(Map.class::cast)
 .map(o -> o.get("name"))
 .filter(String.class::isInstance)
 .map(String.class::cast)
 .collect(Collectors.toList());

This might just be useful even for more complex objects.

Alternatively you can just use an IntStream to iterate over all items in the JSONArray and map all names:

JSONArray array = new JSONArray(jsonString);
List<String> result = IntStream.range(0, array.length())
 .mapToObj(array::getJSONObject)
 .map(o -> o.getString("name"))
 .collect(Collectors.toList());

• java
• android
• json