String gets assigned to a List without a compilation error [duplicate]

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This is not a type erasure problem per se, but almost the opposite: You get a problem at runtime, when the system knows the actual types, but not at compile time. The reason why this compiles is that List is an interface. As far as the compiler is concerned, a subclass of String might actually implement that interface, so the compiler reasons that there could be valid runtime situations where the actual object returned is a String that is also a List. The compiler does not consider that String is final, and thus that it’s impossible to actually create a List-implementing String class.

As to why final is not considered during compilation, Bohemian’s comment to the question gives a good explanation.

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