Arbit.java

public class Arbit {
    public static void main(String[] args) {
        Arbit arbit = new Arbit();
        Container container = new Container();
        container.a =  7;
        container.b = 6;
        arbit.change(container);
        int d = 5;
        arbit.changeInt(d);
        System.out.println(container);
    }


    private void change(Container container) {
        container.a = 9;
        container = new Container();
    }

    private void changeInt(int i) {
        i = 7;
    }

    public static class Container {
        private int a;
        private int b;

        @Override
        public String toString() {
            return "Container{" +
                    "a=" + a +
                    ", b=" + b +
                    '}';
        }
    }
}