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Contents
This exercise introduces [concurrency](https://docs.oracle.com/javase/tutorial/essential/concurrency/index.html). To pass the last test you might find the [`synchronized` keyword or locks](https://docs.oracle.com/javase/tutorial/essential/concurrency/locksync.html) useful. Problems arising from running code concurrently are often intermittent because they depend on the order the code is executed. Therefore the last test runs many [threads](https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html) several times to increase the chances of catching a bug. That means this test should fail if your implementation is not [thread safe](https://en.wikipedia.org/wiki/Thread_safety), but there is a chance it will pass just because there was no concurrent modification attempt. It is unlikely that this will occur several times in a row since the order the code is executed should vary every time you run the test. So if you run the last test a couple of times and it passes every time then you can be reasonably sure that your implementation is correct.
Version data entries
193 entries across 193 versions & 1 rubygems