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 { 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 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 { 52 public void run() { 53 System.out.println("one running"); 54 } 55 public int doStuff() { 56 System.out.println("one"); 57 return 1; 58 } 59 } 60 61 class ClassTwo implements CommonInterface, Runnable { 62 public void run() { 63 System.out.println("two running"); 64 } 65 public int doStuff() { 66 System.out.println("two"); 67 return 2; 68 } 69 } 70 71 class ClassThree implements Runnable { 72 public void run() { 73 System.out.println("three running"); 74 } 75 } 76 77 interface CommonInterface { 78 int doStuff(); 79 } 80
