Let’s say I have the following classes:

public abstract class Abstra{
//constructor...
//methods shared with child classes

}

public class Foo extends Abstra{
//constructor...

//other methods
public void foo()
{
  // some stuff
  if(event)
  //call method of class Test
}
}


public class Bar extends Abstra{
/constructor...

//other methods
public void bar()
{
  //some stuff
    if(event)
  //call method of class Test
}
}


public class Test()
{
  private Abstra fooOrBar;
  //constructor
//other methods in which fooOrBar is used

public void method()
{
System.out.println("Hello!");
}

}

As you can see I basically want to run the instance method of Test right after the if(event) .

What I would normally do is basically pass a reference of Test to Abstra so that I could easily invoke the method but isn’t this a bad design?
Because basically I would a reference of Abstra inside Test and a reference of Test inside Abstra.