1 /*
2  * Copyright (C) 2018 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.CountDownLatch;
18 
19 interface I {
20 }
21 
22 class A implements I {
23     static int x = (int)(10*Math.random());  // Suppress compile-time initialization.
24 }
25 
26 public class Main {
main(String[] args)27     public static void main(String[] args) throws Exception {
28         final CountDownLatch first = new CountDownLatch(1);
29         final CountDownLatch second = new CountDownLatch(1);
30 
31         new Thread(new Runnable() {
32             public void run() {
33                 try {
34                     synchronized(I.class) {
35                         first.countDown();
36                         second.await();
37                     }
38                 } catch (Exception e) {
39                     e.printStackTrace();
40                 }
41             }
42         }).start();
43 
44         first.await();
45         new A();  // Will initialize A.
46         second.countDown();
47 
48         System.out.println("Done.");
49     }
50 }
51