How can we convert a string to a working variable which fetch values in JAVA?

Question

I have a case where I need to store a location of each key value of json, so that for each key, it automatically fetches the location and gives the value for it from json.

Here, I have a location of the key 'vehicle_id' inside json 'car' assigned to a variable like:

String location="jresp.getJSONArray('cars').getJSONObject(0).getString('vehicle_id')"

How do I make it as a variable in JAVA such that this location fetches the value of vehicle_id for me from JSON? I need it like:

String value=jresp.getJSONArray('cars').getJSONObject(0).getString('vehicle_id');

so that it gives me a value. I've searched in net, but couldn't find it anywhere. Please help me!

Can't understand , String varibale = jresp.getJSONArray('cars').getJSONObject(0).getString('vehicle_id'); What u want ?? — Chanky Mallick
– Chanky Mallick, Commented Oct 17, 2018 at 16:13
I'm sorry that I was not clear. I've updated my question. @Chanky — Varshini
– Varshini, Commented Oct 17, 2018 at 16:23
I guess you want to use this String variable at some other place like method or other class? What is exactly the case? — DhaRmvEEr siNgh
– DhaRmvEEr siNgh, Commented Oct 17, 2018 at 16:27
You want at runtime to compile and interpret arbitrary code as part of a method? Convoluted and risky. — Taylor
– Taylor, Commented Oct 17, 2018 at 16:38

Rajeev Ranjan · Accepted Answer · 2018-10-17 17:11:00Z

1

Instead of having the complete statement as a variable like -

String location="jresp.getJSONArray('cars').getJSONObject(0).getString('vehicle_id')"

You could have 3 different variables like -

String jsonArray = "cars";//You might need to do some string processing to get these
int objSeq = 0;
String key = "vehicle_id";

Then you can definitely use it in your Java statement -

String value=jresp.getJSONArray(jsonArray).getJSONObject(objSeq).getString(key);

answered Oct 17, 2018 at 17:11

Rajeev Ranjan

4,1767 gold badges33 silver badges58 bronze badges

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

3 Comments

Varshini Over a year ago

Thats a great suggestion. But the problem with this is, we do not know whether the key is present inside a json array of a json object, or it is just inside a json object

Rajeev Ranjan Over a year ago

If you are bound to get "jresp.getJSONArray('cars').getJSONObject(0).getString('vehicle_id')" such statements, you can have conditional value extraction. In case where location.indexOf("getJSONArray") < 0, you will have only 1 variable i.e - the key. Its not an array and the value would be a different statement accepting only a single key as String value = jsonObj.get(key);

Varshini Over a year ago

@RajeevRajan Thanks alot! That helps me to find a proper way to satisfy all conditions! It really helps!

Collectives™ on Stack Overflow

How can we convert a string to a working variable which fetch values in JAVA?

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related