规格严格-功夫到家-哈工大威海人

摘要： In the first case, the compiler knows that you're trying to unbox a compile-time constant of null. In the second case, the type of the conditional expression is Integer, so you're effectively writing: Integer tmp = new Random().nextBoolean() ? 1 : null;return (int) tmp; ... so the unboxing i 阅读全文