James questions

James answers

• HashSet internally uses hashmap for its implementation, then why is hashmap faster than hashset?
• posterous style email verification
• what is the java correponding collection to Dictionary<string, string>
• How to create an instance if a inner class with getConstructor() [duplicate]
• How to persist the Lucene document index so that the documents do not need to be loaded into it each time the program starts up?
• Type inference in Java 7, When and why should it be used?
• Given an unknown length list, return a random item in it by scanning it only 1 time
• Awaiting multiple instances of CountDownLatch in container
• How do you create a user-defined number of threads?
• Are all immutable objects re-usable?