What is the result(method overload)? : Questions « Object Oriented « SCJP

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public class MainClass extends BaseClass {
  public static void main(String[] args) {
    new MainClass().go();
  }

  void go() {
    go2(new BaseClass(), new MainClass());
    go2((MainClass) new BaseClass(), new MainClass());
  }

  void go2(BaseClass t1, MainClass r1) {
    MainClass r2 = (MainClass) t1;
    BaseClass t2 = (BaseClass) r1;
  }
}

class BaseClass {
}