Subclassing a Class that Subclasses Thread

Main.java

public class Main {

  public static void main(String argv[]) {
    A a = new B();
    a.start();
  }

  static void vulnerableMethod() {
    System.out.println("ur powned");
  }
}

class A extends Thread {

}

class B extends A {
  public void run() {
    Main.vulnerableMethod();
  }
}