Type Erasure

Abstract

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• Generic type information is removed or “erased” at runtime. This means that while you can use types like List<Integer> or List<String> at compile-time, the actual type information about Integer or String is not preserved at runtime. At runtime, both List<Integer> and List<String> will be treated as List with the default type, which in Java is Object

Then what is the point of generic type information?

IIt is used by the compiler to perform type checking. The compiler will then generate code with proper type casting enforced.