Multimap Implementation for Duplicate Keys
The need to store duplicate keys within a map is often encountered in programming. Numerous map implementations exist, but not all of them cater to this requirement. In this question, the user seeks a map implementation that allows for multiple keys, expressing a preference for a pre-existing solution rather than a custom implementation.
The solution lies in the concept of a multimap, which offers a way to store multiple values associated with a single key. Both Apache Commons Collections and Google Guava provide robust multimap implementations.
In particular, Guava's Multimap is highly recommended in Java 5 and above due to its generics-aware nature. It allows you to maintain a collection of values per key, ensuring the integrity of data and seamless retrieval of multiple values assigned to the same key.
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