Update value in Array which has pattern in Java

Question

I have an array which has pattern [{"key1":"value1","key2":"value2"}].

I want to update value2 in the above array.

Please suggest how to proceed using Java.

Thanks in Advance.

@UmaKanth Thanks for the reply. I don't know how to use JSONParser for array which has key value pair. — prashanth
– prashanth, Commented Jul 7, 2015 at 7:08
That "pattern" is JSON format. Use a JSON parser to parse it, then change the value, and use a JSON formatter to convert it back to JSON. — Jesper
– Jesper, Commented Jul 7, 2015 at 7:53

cнŝdk · Accepted Answer · 2015-07-07 10:57:39Z

1

You can use JSONArray and JSONObject to parse your json array from your string, and change the value of value2 using its key key2:

JsonArray jsonArray = JsonArray.readFrom("[{\"key1\":\"value1\",\"key2\":\"value2\"}]");
for(int i=0; i<jsonArray.length();i++){
   JSONObject jo=jsonArray.get(i);
   if(jo.has("key2")) {
      jo.remove("key2");
      jo.put("key2", "new value");
   }
}

And finally change it back to String json:

String changedJSON = jsonArray.toString();

edited Jul 7, 2015 at 10:57

answered Jul 7, 2015 at 7:49

cнŝdk

32.2k7 gold badges62 silver badges81 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Garry · Accepted Answer · 2015-07-07 07:17:41Z

0

You can try like this:

JSONObject object = new JSONObject("[{"key1":"value1","key2":"value2"}]");

String[] keys = JSONObject.getNames(object);

for (String key : keys)
{
    if(key.equals("key2")){
       object.put(key, "new value");
    }
}

answered Jul 7, 2015 at 7:17

Garry

4,5433 gold badges31 silver badges48 bronze badges

Collectives™ on Stack Overflow

Update value in Array which has pattern in Java

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related