The Java language is mostly Object based, however the original designers chose to include eight primitive types - boolean, byte, char, double, float, int, long and short. Commons Primitives provides a library of collections and utilities specially designed for use with primitive types.
JDK 1.5 added auto-boxing to simplify working with primitive types. This is simply a mechanism of automatically converting a primitive to an Object and vice versa, an operation with potentially large memory and performance issues. Commons Primitives offers collections that hold the primitive type directly, and as a result they are usually smaller, faster and easier to work with than their purely Object based alternatives.
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