If your code passes the wrong element to the method, the code compiles fine, but might raise a runtime error or silently return no results.

如果代码给方法传递错误的元素，那么尽管代码将编绎良好，但可能会导致运行时错误或者不返回任何结果。

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It should return false if no changes are made. The example code in Listing 8 shows this logic.

如果没有进行修改，就应该返回false。

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For all other names, the return code should be 1, indicating no such customer found.

对于其它所有的名称来说，返回码应该为1，表明没有发现这样的客户。

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