Java 1.1 允许我们将自变量设成final 属性，方法是在自变量列表中对它们进行适当的声明。这意味着在一个方法的内部，我们不能改变自变量句柄指向的东西。如下所示：

/** * Created by xfyou on 2016/11/2. * final自变量演示 */public class FinalArguments {    void with(final Gizmo g) {        //! g = new Gizmo();    // Illegal -- g is final        g.spin();    }    void without(Gizmo g) {        g = new Gizmo();    // OK -- g not final        g.spin();    }    // void f(final int i) { i++; } // Can't change    // You can only read from a final primitive:    int g(final int i) {        return i + 1;    }    public static void main(String[] args) {        FinalArguments bf = new FinalArguments();        bf.without(null);        bf.with(null);    }}class Gizmo {    public void spin() {    }}