java内部类-局部内部类

package face_09;
/*
 * 内部类可以存放在局部位置上。
 * 
 * 内部类在局部位置上只能访问局部中被final修饰的局部变量。
 */
/*class Outer {
    int num = 3;
    void method() {
        
        final int x = 9;
        class Inner {
            void show() {
                System.out.println("show..."+x);//从内部类中访问局部变量，需要把x声明为最终类型，final
            }
        }
        
        Inner in = new Inner();
        in.show();
    }
        
}
*/
class Outer {
    int num = 3;
    Object method(final int y) {
        
        final int x = 9;
        class Inner {
            void show() {
                System.out.println("show..."+y);
            }
        }
        
        Object in = new Inner();
        return in;
    }
        
}

/*多态
class Fu extends Object {
    
}
class zi extends Fu {
    
}
Fu f = new zi();
Object o = new Fu();
*/
public class InnerClassDemo3 {
    public static void main(String[] args) {
        //new Outer().method();
        Outer outer = new Outer();
        Object object = outer.method(5);
    }
}