Create a new class named Lab2Class with the following public operations.

创建名为Lab2Class的新类，包含以下共有方法。

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Note that the service specification may only provide public operations, and each operation should only consume at most one message and produce at most one message.

注意服务的规约说明只能提供公开的操作，而且每个操作应当只能消耗至多一条消息、产生至多一条消息。

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Interfaces are an important aspect of scaling up to larger systems as you can use interfaces to define the public view of operations "provided" or "required" by a subsystem.

接口是组成一个大型系统的一个重要方面，因为您可以使用接口来定义某个子系统“提供的”或者“需要的”操作的公共视图。

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European peoples are even less supportive than the American public of ongoing operations in the former.

FORBES: Why Are American Troops Still Stationed In Europe?

There is also little public debate about operations that might once have been damned by many Israelis as excessive or errant.

ECONOMIST: Israel��s army: A new, perhaps dangerous, freedom | The

BBC's public-service operations were cross-subsidising its commercial activities.

ECONOMIST: The BBC