Create a library called MyLibrary, which contains a CustomerService interface with three functions, as shown in Listing 1.
创建一个名为MyLibrary的库，其中包含一个带有三个函数的CustomerService接口，如清单1所示。
Create a library called MyLibrary, which contains a CustomerService interface with three functions, as shown in Listing 1.
创建一个名为MyLibrary的库，其中包含一个带有三个函数的CustomerService接口，如清单1所示。
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