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Which line contains the error?

public class Sample24
{
    static int parse(String s)
    {
        assert s != null;
        return Integer.parseInt(s);
    }

    public static void main(String[] args)
    {
        System.out.println(parse(null));
    }
}

  • A.assert s != null; fails to compile
  • B.parse(null) cannot pass null to an int parameter
  • C.Nothing is wrong; the program prints 0.
  • D.The assertion is skipped without -ea, so Integer.parseInt(null) throws instead

Answer: D

parse is not public, so asserting the precondition is reasonable. The fault is the caller: main knowingly passes null, which is a bug the assertion only reports when -ea is set. Without it Integer.parseInt(null) throws NumberFormatException, which names the symptom rather than the cause.

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