1 /*
2  * Copyright (C) 2014 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 public class Main {
main(String[] args)18     public static void main(String[] args) {
19         Object o = new Object();
20         // Generate a hashcode and put it in the lock word.
21         int hashOrig = o.hashCode();
22         int hashInflated = 0;
23         int hashSystemOrig = System.identityHashCode(o);
24         int hashSystemInflated = 0;
25         // Inflate the monitor to move the hash from the lock word to the Monitor.
26         synchronized (o) {
27             hashInflated = o.hashCode();
28             hashSystemInflated = System.identityHashCode(o);
29         }
30         // Make sure that all the hashes agree.
31         if (hashOrig != hashInflated || hashOrig != hashSystemOrig ||
32             hashSystemOrig != hashSystemInflated) {
33             System.err.println("hash codes dont match: " + hashOrig + " " + hashInflated + " " +
34             hashSystemOrig + " " + hashSystemInflated);
35         }
36         System.out.println("Done.");
37     }
38 }
39 
40 
41