How can I suppress unchecked cast warnings?

Question

Having the following code:

fun doSomething(): List<String> {

    val test: List<*> = arrayListOf("test1", "test2")

    return test as List<String>
}

Is there some way to suppress the unchecked cast warning that comes up in the last line? I tried to use the standard Java way @SuppressWarnings("unchecked") at the method level, but it didn't work.

`@Suppress("UNCHECKED_CAST")` works well for IDEA 15.0.4. Just press Alt+Enter on highlighted `test as List` and use *"Suppress 'UNCHECKED_CAST' for fun doSomething"* — awesoon, Mar 25 '16 at 14:08

score 77 · Accepted Answer · edited Aug 14 '18 at 10:03

77

Adding @Suppress("UNCHECKED_CAST") (also possible through IDEA's Alt+Enter menu) to any of statement, function, class and file should help.

Before:

After:

edited Aug 14 '18 at 10:03

mhlz

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answered Mar 25 '16 at 14:08

hotkey

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@Suppress? What package is that in? – flodin Mar 27 '20 at 11:02
1

@flodin, https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-suppress/ – hotkey Mar 27 '20 at 11:58
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Is there a document available anywhere stating all the "suppressables" for kotlin or java? – Jun 22 '20 at 18:28

How can I suppress unchecked cast warnings?

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