1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 /**
18  * Return stuff.
19  */
20 public class Main {
main(String[] args)21     public static void main(String[] args) {
22 
23         System.out.println("pick 1");
24         pickOne(1).run();
25         System.out.println(((CommonInterface)pickOne(1)).doStuff());
26 
27         System.out.println("pick 2");
28         pickOne(2).run();
29         System.out.println(((CommonInterface)pickOne(2)).doStuff());
30 
31         System.out.println("pick 3");
32         pickOne(3).run();
33     }
34 
pickOne(int which)35     public static Runnable pickOne(int which) {
36         Runnable runme;
37 
38         if (which == 1)
39             runme = new ClassOne();
40         else if (which == 2)
41             runme = new ClassTwo();
42         else if (which == 3)
43             runme = new ClassThree();
44         else
45             runme = null;
46 
47         return runme;
48     }
49 }
50 
51 class ClassOne implements CommonInterface, Runnable {
run()52     public void run() {
53         System.out.println("one running");
54     }
doStuff()55     public int doStuff() {
56         System.out.println("one");
57         return 1;
58     }
59 }
60 
61 class ClassTwo implements CommonInterface, Runnable {
run()62     public void run() {
63         System.out.println("two running");
64     }
doStuff()65     public int doStuff() {
66         System.out.println("two");
67         return 2;
68     }
69 }
70 
71 class ClassThree implements Runnable {
run()72     public void run() {
73         System.out.println("three running");
74     }
75 }
76 
77 interface CommonInterface {
doStuff()78     int doStuff();
79 }
80