1 package face_09;

 2 /*

 3  * 内部类可以存放在局部位置上。

 4  *

 5  * 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。

 6  */

 7 /*class Outer {

 8     int num = 3;

 9     void method() {

10

11         final int x = 9;

12         class Inner {

13             void show() {

14                 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

15             }

16         }

17

18         Inner in = new Inner();

19         in.show();

20     }

21

22 }

23 */

24 class Outer {

25     int num = 3;

26     Object method(final int y) {

27

28         final int x = 9;

29         class Inner {

30             void show() {

31                 System.out.println("show..."+y);

32             }

33         }

34

35         Object in = new Inner();

36         return in;

37     }

38

39 }

40

41 /*多态

42 class Fu extends Object {

43

44 }

45 class zi extends Fu {

46

47 }

48 Fu f = new zi();

49 Object o = new Fu();

50 */

51 public class InnerClassDemo3 {

52     public static void main(String[] args) {

53         //new Outer().method();

54         Outer outer = new Outer();

55         Object object = outer.method(5);

56     }

57 }