1 /* 2 * Copyright (C) 2011 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 import java.util.concurrent.*; 18 19 interface I { 20 } 21 22 class A implements I { 23 static int x = (int)(10*Math.random()); // Suppress initialization. 24 } 25 26 public class Main { 27 public static void main(String[] args) throws Exception { 28 29 final CountDownLatch first = new CountDownLatch(1); 30 final CountDownLatch second = new CountDownLatch(1); 31 32 new Thread(new Runnable() { 33 public void run() { 34 try { 35 synchronized(I.class) { 36 first.countDown(); 37 second.await(); 38 } 39 } catch (Exception e) { 40 e.printStackTrace(); 41 } 42 } 43 }).start(); 44 45 first.await(); 46 new A(); 47 second.countDown(); 48 System.out.println("Hello, world!"); 49 } 50 } 51
