class ClassB {
        int numB = 0;
        public int getNumB(){
            return numB;
        }
        void createNumB(int Int){
            numB = Int;
        }
    }

    public class ClassA {
        ClassB b = new ClassB();

        // Returns numB from ClassA
            public int returnB(){
            return b.getNumB();
        }

         public static void main(String[]args){
             ClassA a = new ClassA();
             ClassB b = new ClassB();

       //My espectation is that b.createNumB(1) should update numB in ClassA
             b.createNumB(1);
             System.out.println(a.returnB());
         }
        }