你知道输出什么吗

public class B extends A {
 public void haha() {
  System.out.println("HAHA in B");
 }

 public B() {
  B.this.haha();
  haha();
 }

 public static void main(String[] args) {
  B b = new B();
 }
}
class A {
 public void haha() {
  System.out.println("HAHA in A");
 }

 public A() {
  A.this.haha();
 }
}