public class O2 {
  public class Top {

    public void f(Object o, String s) {
      System.out.println("Top.f(Object,String) = " + o + "," + s);
    }
    public void f(String s, Object o) {
      System.out.println("Top.f(String,Object) = " + s + "," + o);
    }
    public void f(String s, String s1) {}
  }

  public class Bottom extends Top {
    public void f(String s, String s1) {
      System.out.println("Bottom.f(String,String) = " + s + "," + s1);
    }
  }

  public void top() {
    Top x = new Bottom();
    x.f("bye","bye");
  }

  public void bottom() {
    Bottom x = new Bottom();
    x.f("bye","bye");
  }


  public static void main(String[] args) {
    O2 olt = new O2();
    if (args.length != 0)
      olt.top();
    else olt.bottom();

  }
}