public class O1 {

  public class Top {
    public void f(Object o) {
      System.out.println("Top.f(Object) = " + o);
    }

  }

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

  public void top() {
    Top top = new Bottom();
    top.f(new java.util.Vector());
    top.f("hello");
    top.f((Object)"hello");
  }

  public void bottom() {
    Bottom top = new Bottom();
    top.f(new java.util.Vector());
    top.f("hello");
    top.f((Object)"hello");
  }

  public static void main(String[] args) {
    O1 olt = new O1();
    if (args.length != 0)
      olt.top();
    else olt.bottom();

  }
}