ArrayList Generic without Type

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Java generic collections are not stored with a type to ensure backwards compatibility with pre J2SE 5.0. Type information is removed when added to a generic collection. This is called Type Erasure.

This means that a generic collection can be assigned to a non generic reference and objects in a generic typed collection can be placed in an non generic, nontyped collection.

All Java generics really does is make sure you can’t add the wrong type to a generic list and saves you from doing an explicit cast on retrieval; even though it is still done implicitly.

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