interface InterfaceA{
  void functionA();
}

interface InterfaceB{
  void functionB();
}

class A implements InterfaceA{
  @override
  void functionA(){
    System.out.println("classA: functionA");
  }
}

class B implements InterfaceB{
  @override
  void functionB(){
    System.out.println("classB: functionB");
  }
}

class Test implements InterfaceA, InterfaceB {

  InterfaceA instanceA;
  InterfaceB instanceB;

  Test(InterfaceA interfaceA, InterfaceB interfaceB){
    instanceA = interfaceA;
    instanceB = interfaceB;
  }

  @override
  void functionA(){
    instanceA.functionA();
  }

  @override
  void functionB(){
    instanceB.functionB();
  }

}