1 // Copyright 2007 The Android Open Source Project 2 3 /** 4 * Return stuff. 5 */ 6 public class Main { 7 public static void main(String[] args) { 8 9 System.out.println("pick 1"); 10 pickOne(1).run(); 11 System.out.println(((CommonInterface)pickOne(1)).doStuff()); 12 13 System.out.println("pick 2"); 14 pickOne(2).run(); 15 System.out.println(((CommonInterface)pickOne(2)).doStuff()); 16 17 System.out.println("pick 3"); 18 pickOne(3).run(); 19 } 20 21 public static Runnable pickOne(int which) { 22 Runnable runme; 23 24 if (which == 1) 25 runme = new ClassOne(); 26 else if (which == 2) 27 runme = new ClassTwo(); 28 else if (which == 3) 29 runme = new ClassThree(); 30 else 31 runme = null; 32 33 return runme; 34 } 35 } 36 37 class ClassOne implements CommonInterface, Runnable { 38 public void run() { 39 System.out.println("one running"); 40 } 41 public int doStuff() { 42 System.out.println("one"); 43 return 1; 44 } 45 } 46 47 class ClassTwo implements CommonInterface, Runnable { 48 public void run() { 49 System.out.println("two running"); 50 } 51 public int doStuff() { 52 System.out.println("two"); 53 return 2; 54 } 55 } 56 57 class ClassThree implements Runnable { 58 public void run() { 59 System.out.println("three running"); 60 } 61 } 62 63 interface CommonInterface { 64 int doStuff(); 65 } 66 67
