package firstPackage;

public class First {
  String name;
}

package secondPackage;

import firstPackage.First ;

public class Second extends First {
  //Just extends
}

package firstPackage;

import secondPackage.Second;

public class Third {

  public void accessThroughReference() {
    Second second = new Second();
    second.name = "l"; //<---the name is not visible actually
  }

}