Java final exploration of trickle down effects

FinalTrickleDownTest.java

class Ob
{
    int x;

    Ob(final int x)
    {
        this.x = x;
    }

    public int getX()
    {
        return x;
    }

    @Override
    public String toString()
    {
        return super.toString();
    }
}

class FinalTrickleDownTest
{
    public static void main(String[] args)
    {
        final Ob x = new Ob(1);
        System.out.println("In main before mutate: " + x + " with value " + x.getX());

        mutator(x);
        mutator2(x);

        System.out.println("In main after mutate: " + x + " with value " + x.getX());
    }

    static void mutator(Ob x)
    {
        x = new Ob(9);
        System.out.println("In mutator: " + x + " with value " + x.getX());
    }

    static void mutator2(Ob x)
    {
        System.out.println("In mutator: " + x + " with value " + x.getX());
    }
}