Java final自变量详解编程语言

/** 
 * 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() { 
    } 
}