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Generics are used for tighter type checks at compile time and to provide a generic programming. To implement generic behaviour, java compiler apply type erasure. Type erasure is a process in which compiler replaces a generic parameter with actual class or bridge method. In type erasure, compiler ensures that no extra classes are created and there is no runtime overhead.
Type Erasure rules
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Replace type parameters in generic type with their bound if bounded type parameters are used.
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Replace type parameters in generic type with Object if unbounded type parameters are used.
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Insert type casts to preserve type safety.
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Generate bridge methods to keep polymorphism in extended generic types.
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