Sorting JSONObject using a value of a JSONArray in Java

Question

I have following JSONObject i am trying to sort:

{
  "coords": {
    "27": {
      "x": [70,71,72],
      "y": [1945,1946,1947],
      "lineNumber": [
        19
      ]
    },
    "29": {
      "x": [70,71,72],
      "y": [1945,1946,1947],
      "lineNumber": [
        91
      ]
    },
    "2333": {
      "x": [70,71,72],
      "y": [1945,1946,1947],
      "lineNumber": [
        10
      ]
    }
  }
}

I wanted to sort the JSONObjects inside coords wrt the value lineNumber . lineNumber array always has only one element inside. I am using simple JSON.

Answer 1

Unfortunately there isn't a clean way to do this.

You can convert your map to a list of Map.Entry<K,V> objects. In your case the entries are of type Map.Entry<String, JSONObject> (entries inside coords ).

The list can then be sorted by entry V alues, or in your case JSONObject s. The easiest way to do this is to write a custom Comparator and sort your list via Collections.sort(...) .