Needed example of .toStringArray()

Processing Beginners
1

I have tried evey which way to get this function to work…
Anybody got a working example ?
Here is my Json array: [{“id”: “1”}]
I couldn’t make it any simpler. Or am I barking up the wrong tree ?

2

Its reference states: “(All values in the array must be of the String type.)”

However your JSONArray contains an JSONObject and not a string, which isn’t valid:
[{"id": "1"}]

Should be instead something like this:
[ "id", "1" ]

2 Likes
3

JSONArray loopData;
loopData = loadJSONArray(“data.json”);
println(loopData);
String strngArray = loopData.toStringArray();

loads a JSON Array from file - containing [{“id”: “1”}]
That is the minimum that the loadJSONArray will accept.
This why I was asking for a working example.

4

Thanks for the response - [ “id”,“id2”] does load correctly and IS converted to a String
But that is Soooooo limited.
I will have to do a manual conversion as my JSONArray contains Arrays, Objects etc.

1 Like
5

Hello @dneilan,

This is an interesting topic and I am interested in your manual conversion.
A simple example will suffice.

This was a very quick effort for me and the data was straightforward from one of the Processing examples:

// Reference:
// https://www.freecodecamp.org/news/jsonobject-tostring-how-to-convert-json-to-a-string-in-java/

String[] species = { "Capra hircus", "Panthera pardus", "Equus zebra" };
String[] names = { "Goat", "Leopard", "Zebra" };

JSONArray values;

String [] JSONtoArr;

void setup() 
  {
  values = new JSONArray();

  for (int i = 0; i < species.length; i++) 
    {
    JSONObject animal = new JSONObject();

    animal.setInt("id", i);
    animal.setString("species", species[i]);
    animal.setString("name", names[i]);

    values.setJSONObject(i, animal);
    }
  
  String s = values.toString();
  println(s);
  println();
  
  JSONtoArr = split(s, '\n');
  printArray(JSONtoArr );
  println();
  
  for(int i=0; i< JSONtoArr.length; i++)
    {
    JSONtoArr[i] = JSONtoArr[i].trim();
    JSONtoArr[i] = JSONtoArr[i].replaceAll("\"", "");   
    }
  printArray(JSONtoArr);   
  println();
    
  saveStrings("test.txt", JSONtoArr);
  }

image
image851×963 57.3 KB

I always enjoy the challenge of custom parsing data to access elements and wield them with code.

Have fun!

:)

6 
import java.util.Arrays;
  String[] words = {"go", "to ", "school"};
 println(Arrays.toString(words));  //print [go, to , school] 
 printArray(words);
//print
// [0] "go"
//[1] "to "
//[2] "school"
7

Gee thanks. Not helpful