Java callback (in another class) to populate private member

Question

Please forgive my Java syntax as I am a Java beginner.

I have 3 classes Main, Tool, ToolResultCallback.

class Main {
  private DataList dl;
  public doSomething() {
    Tool t = new Tool();
    ToolResultCallback TRC = new ToolResultCallback();
    t.startSomething(TRC);
  }
}

// in separate file
class Tool {
   public void startSomething(ToolResultCallback TRC) {
   }
}

// in separate file
class ToolResultCallback extends AbstractTRC {
   @Override
   public onEvent(SomeData d) {
      // how to populate DataList of Main?
   }
}

How do I populate DataList dl from callback function in another class/ file?

Answer 1

Pass dl to the ToolResultCallback constructor, and store it in a field.

Thanks @tgdavies