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import java.util.Hashtable;
import org.checkerframework.checker.nullness.qual.Nullable;
class HashtableTest {
public static void main(String[] args) {
// :: error: (type.argument.type.incompatible)
Hashtable<@Nullable Integer, String> ht1 = new Hashtable<>();
// Suffers null pointer exception
ht1.put(null, "hello");
// :: error: (type.argument.type.incompatible)
Hashtable<Integer, @Nullable String> ht2 = new Hashtable<>();
// Suffers null pointer exception
ht2.put(42, null);
}
}
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