class abstract A {
   @Inject
   A() {}

   @Inject
   A(A1 a1, A2 a2) {
      this.a1 =a1;
      this.a2 =a2;
   }
   public abstract doSomething();
   A1 a1;
   A2 a2;
}

class B extends A {

   @Inject
   A(A3 a3) {
      this.a3 =a3;
   }
   public doSomething() {
          System.out.println("some work");
   };
   A3 a3;
}
class C extends A {

   @Inject
   A(A4 a4) {
      this.a4 =a4;
   }
   public doSomething() {
          System.out.println("some work");
   };
   A4 a4;
}