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() {
}
}