9
Task
Java Collections,
level 7,
lesson 6
Locked
Find the class by its description
The getExpectedClass method must return a class that matches the following description:
1. It implements the Map interface.
2. It is used when working with threads.
3. It a non-blocking version of a skip list that has been adapted for hash tables.
9
Task
Java Collections,
level 7,
lesson 6
Locked
Bug fix
The getExpectedMap method is used everywhere in your huge project.
At some point, the testers discovered that the getExpectedMap method throws a NullPointerException.
The expected behavior is described in the main method's comments.
9
Task
Java Collections,
level 7,
lesson 6
Locked
Ambiguous behavior for NULL
Change the implementation of the getExpectedMap method. It must return an object of a class that has the opposite
behavior when adding a null reference.
See the example output in the main method.
Don't change the rest of the code..
18
Task
Java Collections,
level 7,
lesson 6
Locked
Caching proxy
The Proxy pattern provides an object that controls access to another object.
You need to create a CachingProxyRetriever class in the retrievers package. It will provide the same
functionality as the OriginalRetriever class, but with one important addition.
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