Type Erasure

Definitions

1. The compile-time removal of generic type information so that the runtime operates on raw types. Java's approach to generics — List<String> and List<Integer> become the same List at runtime. Simplifies backwards compatibility but prevents runtime type inspection and causes subtle gotchas.

   In plain English: When the compiler removes type details from generic code so the program can't tell the difference at runtime.

   Example: "You can't do instanceof List<String> in Java because of type erasure — the generic parameter doesn't exist at runtime."

Related Terms

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