第10章 内部类

 1 public class DotThis {
 2 
 3 void f() {
 4 
 5 System.out.println("DotThis.f()");
 6 
 7 }
 8 
 9 public class Inner {
10 
11 public DotThis outer() {
12 
13 f();
14 
15 return DotThis.this;
16 
17 // A plain "this" would be Inner‘s "this"
18 
19 }
20 
21 }
22 
23 public Inner inner() {
24 
25 return new Inner();
26 
27 }
28 
29 public static void main(String[] args) {
30 
31 DotThis dt = new DotThis();
32 
33 DotThis.Inner dti = dt.inner();
34 
35 dti.outer().f();
36 
37 }
38 
39 } /*
40 
41  * Output: DotThis.f()
42 
43  */// :~

 1 public class DotNew {
 2 
 3   public class Inner {
 4 
 5   public Inner(){
 6 
 7   System.out.println("Inner class constructor.");
 8 
 9   }
10 
11   }
12 
13   public static void main(String[] args) {
14 
15     DotNew dn = new DotNew();
16 
17     DotNew.Inner dni = dn.new Inner();     //dn已经指明外部类，故不需（也不能）dn.new DotNew.Inner();
18 
19     //!DotNew.Inner dni2 = new DotNew.Inner();
20 
21   }
22 
23 } ///:~

 1 package exercise;
 2 import static net.mindview.util.Print.*;
 3 
 4 interface Game {
 5     boolean move();
 6 }
 7 
 8 interface GameFactory {
 9     Game getGame();
10 }
11 
12 class Checkers implements Game{
13     private int moves = 0;
14     private static final int MOVES = 3;
15     public boolean move(){
16         print("Checkers move " + moves);
17         return ++moves != MOVES;
18     }
19     public static GameFactory factory = new GameFactory(){
20         public Game getGame(){
21             return new Checkers();
22         }
23     };
24 }
25 
26 
27 public class Common {
28     
29     public static void serviceConsumer(GameFactory fact){
30         Game g = fact.getGame();
31         while(g.move());
32     }
33     
34     public static void main(String[] args) {
35         serviceConsumer(Checkers.factory);
36     }
37 
38 }