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An unchecked cast of a generic type with parameterized exception declaration can also result in unexpected checked exceptions. The compiler complains unless the warnings are suppressed.
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interface Thr<EXC extends Exception> {
void fn() throws EXC;
}
public class UndeclaredGen {
static void undeclaredThrow() throws RuntimeException {
@SuppressWarnings("unchecked") // suppresses warnings
Thr<RuntimeException> thr = (Thr<RuntimeException>)(Thr)
new Thr<IOException>() {
public void fn() throws IOException {
throw new IOException();
}
};
thr.fn();
}
public static void main(String[] args) {
undeclaredThrow();
}
}
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