访问空指针是非常危险的，因为它可能使您的程序崩溃。
Accessing the null pointer is very dangerous, as it might crash your program.
在下一个部分，我们将还要注视另外一个非常普遍的，也被证明是一个空指针异常的错误类型，以及怎样识别它和避免它。
In the next installment, we'll take a look at yet another very common bug pattern that manifests itself as a null-pointer exception, how to recognize it, and how to avoid it.
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