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authorMathieu Chartier <mathieuc@google.com>2014-09-08 14:48:25 -0700
committerMathieu Chartier <mathieuc@google.com>2014-09-08 15:08:24 -0700
commitbccf12317e7511d6c49e3d9ab3e40e7b9843eb5b (patch)
tree715f9231604277d60a2c8828b27faa206c0f0b5c /test/120-hashcode/src
parent6148d5340d5f2f4cffaa465229a1722b5a775c28 (diff)
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Add test for hashCode and System.identityHashCode.
Change-Id: I325e95c23bda05bc9babff428111bb8d21f7f2d4
Diffstat (limited to 'test/120-hashcode/src')
-rw-r--r--test/120-hashcode/src/Main.java40
1 files changed, 40 insertions, 0 deletions
diff --git a/test/120-hashcode/src/Main.java b/test/120-hashcode/src/Main.java
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+++ b/test/120-hashcode/src/Main.java
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class Main {
+ public static void main(String[] args) {
+ Object o = new Object();
+ // Generate a hashcode and put it in the lock word.
+ int hashOrig = o.hashCode();
+ int hashInflated = 0;
+ int hashSystemOrig = System.identityHashCode(o);
+ int hashSystemInflated = 0;
+ // Inflate the monitor to move the hash from the lock word to the Monitor.
+ synchronized (o) {
+ hashInflated = o.hashCode();
+ hashSystemInflated = System.identityHashCode(o);
+ }
+ // Make sure that all the hashes agree.
+ if (hashOrig != hashInflated || hashOrig != hashSystemOrig ||
+ hashSystemOrig != hashSystemInflated) {
+ System.err.println("hash codes dont match: " + hashOrig + " " + hashInflated + " " +
+ hashSystemOrig + " " + hashSystemInflated);
+ }
+ System.out.println("Done.");
+ }
+}
+
+