How Can I Implement a Map with Duplicate Keys in Java?

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.

The above is the detailed content of How Can I Implement a Map with Duplicate Keys in Java?. For more information, please follow other related articles on the PHP Chinese website!