Web Reference: You can't. An ArrayList is not an ArrayList even if the first one contains all User objects. Dec 6, 2025 · In this blog, we’ll demystify why a direct cast from `List` to `ArrayList` often fails and explore a safe, reliable alternative. By the end, you’ll understand the root cause of the failure, how to avoid it, and best practices for working with `List` and `ArrayList` in Java. Since ArrayList implements the List interface, this is possible. It works the same way, but some developers prefer this style because it gives them more flexibility to change the type later.
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