Hiding public mutators on mapped bean

[Bell, Douglas]

 Is it possible to hide a exposed mutator on a public interface when it
is presented to a client?

i.e.
Package foo;

Public class Bar
{
        private String field;

        public void setField(String field)
        {
                this.field = field;
        }

        public String getField()
        {
                return field;
        } 
}

I only want getField to be exposed, but have classes outside this
pacakge that need to have access to setField.

Thanks,

Doug