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Editorial Team
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Asked: 2026-05-20T19:31:00+00:00

This block compiles properly: ArrayList<Baz> list = savedInstanceState.getParcelableArrayList(foo); bar(list); But this block errors stating

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This block compiles properly:

ArrayList<Baz> list = savedInstanceState.getParcelableArrayList("foo");
bar(list);

But this block errors stating that ArrayList<Parcelable> can not be cast to ArrayList<Baz>:

bar((ArrayList<Baz>)savedInstanceState.getParcelableArrayList("foo"))

Where bar is of the form:

private void bar(ArrayList<Baz> food) {
}

And Baz is a class that implements the Parcelable interface

Is there a way that the direct cast can be done rather than having to perform an implicit cast and create an unnecessary variable?

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1 Answer

  1. Editorial Team

    What is the error that you’re getting; I would think that you’ll only get a warning stating that it is an unchecked cast. If this is the case, you will need to add @SuppressWarnings("unchecked") to the function that you’re FROM. To be honest; you’d be best to create a separate variable to catch the return value then send the variable.

    One of the issues that you’ll see here is that Java’s type erasure is going to hurt you. If T is declared differently between calling function and receiving function, when T is removed there is nothing that prevents someone from actually sending your function which expects ArrayList an ArrayList. Which is why this is a type safety issue.

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