How to store JSON array variable and printing specific value. (JAVA)

Question

To print the neccesary details we used the following command System.out.println(msgFromServer.data);

Now the following details are fetched from server

[{id={name=XDA Studio, color=red}, angle=-0.24456912236854822, piecePosition={pieceIndex=39.0, inPieceDistance=35.797426838065036, lane={startLaneIndex=1.0, endLaneIndex=1.0}, lap=2.0}}]

How to store these above server messages in json array variable and print value of angle alone.

Did you just put the output of three System.out.println() command? or one command gave you three lists? — Sambhav Sharma
– Sambhav Sharma, Commented Apr 26, 2014 at 11:57

Sambhav Sharma · Accepted Answer · 2014-04-26 12:14:11Z

1

msgFromServer.data seems to return a List. Your List is something like

List<Map<String,Object>>

If you use Jackson parser, you could probably convert it to a Json String using the following code:

ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(list);

I have provided code for Jackson library, you could use any other with library specific implementation and code

edited Apr 26, 2014 at 12:14

answered Apr 26, 2014 at 12:06

Sambhav Sharma

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7 Comments

Sambhav Sharma Over a year ago

Well, in that case it is simple, just use one of the Json library to parse it to a Json string, like for example, I provided code for Jackson parser: jackson.codehaus.org i will also edit my answer then.. :)

Aldo Over a year ago

can u provide little brief explanation with code example

Sambhav Sharma Over a year ago

Can you tell me what kind of object does msgFromServer.data returns?

Aldo Over a year ago

public final Object data;

Sambhav Sharma Over a year ago

Can you cast this Object to a List? try it.. (List<Object>)msgFromServer.data

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