Java – create dynamic objects through JSON

I have an Android application that receives strings in JSON format

The JSON structure contains a set of JSON objects of different types. I will create a class for each type and hope to instantiate the object directly from JSON with the help of the JSON framework

For simplicity, let's consider the following example:

We have two Java classes:

public class A
{
   public String a1 = "";

   public int a2 = 0;

}

public class B
{
   public double b1 = 0;
   public double b2 = 0;
   public double b3 = 0;
}

No, we have a JSON array

[
  {
    "a1": "Teststring",
    "a2": 12
  },
  {
    "b1": 3,
    "b2": 4,
    "b3": 5
  },
  {
    "a1": "Teststring2",
    "a2": 24
  }
]

I don't know which, how many, or in what order JSON objects appear, but I can modify their JSON representation

One solution I can think of:

From what I read about the framework, compared with gson, Jackson can do both, read specific values and generate Java instances. Therefore, I can add type information to JSON objects:

    [
  {
    "type": "A",
    "a1": "Teststring",
    "a2": 12
  },
  {
    "type": "B",
    "b1": 3,
    "b2": 4,
    "b3": 5
  },
  {
    "type": "A",
    "a1": "Teststring2",
    "a2": 24
  }
]

Read the value from the type and generate the correct object from it

What do you think of my method? Is there a general solution to my problem?

resolvent:

Instead of putting everything into an array, why not use JSON objects and add these objects as members to the object with common names (including - Types and some indexes)

    {
        "A0":
        { ... },
        "B0":
        { ... },
        "A1":
        { ... },
    }