Java Casting crashes websocket-CodePudding

So I have a wierd issue. Im connecting to a websocket.

Everything is fine as the data flows in.

@Override
public void onMessage(WebSocket webSocket, String text) 
{
      // My data looks like 
      // {"Type":3, "F":[1,2,3974.909912109375,27500,1639207185]}

      obj = new JSONObject(text);
      // Then I get the array in "F" key
      o = obj.getJSONArray("F");

     // I want to now cast these variables into variables to use.
   
     // So I do...
     Integer v = (Integer) o.get(0);
     Integer t = (Integer) o.get(1);

     // This works fine.  
     // If I stop here.....
     // the websocket stays connected, and keeps streaming....

     // However.... if I do this....
     Double p = (Double) o.get(2);

    // The websocket crashes, and disconnects??
    // Program continues running though and there is no exceptions.
    // Its merely disconnecting the socket for some reason, by casting?

 }

What is going on here?? Why cant I cast that to a double??

Ive also tried Float with no luck.

Any ideas??

Iva also tried...

Double p = new Double((Integer) o.get(2));
Double p = new Double((Float) o.get(2));
Float p = (Float) o.get(2);
float p = (float) o.get(2);
double p  = Double.parseDouble((String) o.get(2));

All these things crash/disconnect the websocket.

Seems when I try to access index 2, things go wonky.
However....

I can do

System.out.println(o.get(2));

Just fine, and it prints

3974.909912109375

CodePudding user response：

You can't cast that to a Double directly. Instead try using

Double p = Double.parseDouble(o.get(2));

That being said, it would probably be a better thing to keep your data consistent and cast everything to Double while you're at it to avoid issues down the line.

String text = "1,2,3974.909912109375,27500,1639207185";
String[] inputs = text.split(",");
List<Double> doubles = Arrays.stream(inputs)
    .map(Double::parseDouble)
    .collect(Collectors.toList());