Is it possible to iterate through JSONArray?

Question

Possible Duplicates:
JSON Array iteration in Android/Java
JSONArray with Java

Is it possible to iterate through JSONArray object using Iterator?

Check this out http://stackoverflow.com/questions/3408985/json-array-iteration-in-android-java — yeradis, Jan 24 '11 at 17:21

score 284 · Answer 1 · edited Mar 17 '17 at 17:47

284

Not with an iterator.

For org.json.JSONArray, you can do:

for (int i = 0; i < arr.length(); i++) {
  arr.getJSONObject(i);
}

For javax.json.JsonArray, you can do:

for (int i = 0; i < arr.size(); i++) {
  arr.getJsonObject(i);
}

edited Mar 17 '17 at 17:47

RealHowTo

answered Jan 24 '11 at 17:17

Ben McCann

7

Wouldn't it will calling arr.length() on each iteration? So maybe better to put that into vairable and use that in the loop. – husayt Mar 07 '12 at 12:05
Well yes but it will be the same value everytime, but yes its unecessary a variable should be better. – Henrique C. Aug 06 '13 at 10:34
11

Depends on the Compiler, Also I believe it'll just be a getter fetching a value which is not mutable from outside the instance, setting a variable would just allocate more memory 8-). – Mathijs Segers Jan 23 '15 at 13:14
1

There is no `.length()` method on a `JsonArray`, but there is a `.size()` method inherited from `java.util.List`. https://docs.oracle.com/javaee/7/api/javax/json/JsonArray.html – Peter Dec 11 '16 at 02:25
Is he referring to https://github.com/stleary/JSON-java/blob/master/JSONArray.java? – Mike Stoddart Jan 13 '17 at 16:08
Good Job......!! – Shridutt Kothari Jun 14 '19 at 10:29

score 5 · Answer 2 · answered Jan 24 '11 at 17:17

5

You can use the opt(int) method and use a classical for loop.

answered Jan 24 '11 at 17:17

Jean Hominal

2 Answers2