多选题 What best describes the result of the following code segment? The ArrayList sampleArrayList has already been declared and initialized.
int i = 63;
sampleArrayList.add(i);

A. The int is successfully placed into the ArrayList.
B. The int is converted to an Integer via autoboxing and then placed into the ArrayList.
C. null is placed into the ArrayList.
D. A compile time error will be generated.
E. A runtime exception will be thrown.

【正确答案】 B

【答案解析】基本数据类型不能存储在ArrayList中。但是，如果它们被放置到其基本数据类型的封装类中，则可以存储。如果一个基本数据类型被放入ArrayList中，则Java将通过其自动装箱功能自动转换。A、C、D和E不正确。A不正确，因为int不能直接放入ArrayList中。C不正确，因为null不能放入ArrayList中。D和E不正确，因为它们是正确的代码。