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      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 {
     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