public class RequestDemo { public static void main(String[] args) { for(int i = 0; i < 10; i++) { int n = (int) (Math.random() * 10) % 2; switch (n) { case 0: doRequest( new HelloRequest("良葛格")); break; case 1: doRequest(new WelcomeRequest("Wiki 網站")); } } } public static void doRequest(IRequest request) { request.execute(); } }