java inherit method of Nester Inner class where Inner class has private Identifier

public class Testing {

  public String name = null;

  public String getName() {
    TestingInner test = new TestingInner("Testing inner override");
    return test.getNameString();
  }

  public String testName() {
    return this.name;
  }

  private class TestingInner {

    String nameString = null;

    public TestingInner(String name) {
      this.nameString = name;
    }

    public String getNameString() {
      return "Inner Class " + this.nameString;
    }
  }
}

public class Testing2 extends Testing.TestingInner {

  @Override
  public String getNameString() {
    System.out.println("Override Inner class method");
    return "This is";
  }
}

Getting multiple error message which is expected

> The method getNameString() of type Testing2 must override or implement a supertype method
>
> The type Testing.TestingInner is not visible

Question is there any way to override getNameString() which is under inner class which is private.
Changing private to public will work, but wanted to see if any implementation exist to override getNameString()

In order to be able to extend a class, the class must be accessible: referring to JLS 8.1.4:

> ClassExtends:
> extends ClassType
>
> ...
>
> The ClassType must name an accessible class (§6.6), or a compile-time error occurs.

Referring to JLS 6.6.1, "Determining Accessibility" (emphasis added):

> ...
> * Otherwise, the member [class, interface, field, or method] or constructor is declared private. Access is permitted only when one of the following is true:
> * Access occurs from within the body of the top level class or interface that encloses the declaration of the member or constructor.
> * Access occurs in the permits clause of the top level class or interface that encloses the declaration of the member.
> * Access occurs in the record component list of the top level record class that encloses the declaration of the member.

Your class would be accessible inside the body of Testing, the top-level class, so you could extend it there. But you can't do it outside the body of Testing.

No, you can't do it. You can't extend a class that isn't visible so there is nothing visible to override. That it is an inner class is irrelevant.