As the operations offered by the classes are the same, you can use an interface to define a contract that all of your classes implement.

由于这些类提供的操作相同，您可以使用一个接口来定义一个所有类实现的协定。

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Applications can then use the DiscoveryClient API to find services that implement a given contract.

然后应用程序就可以使用DiscoveryClient API来寻找实现特定contract的服务。

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Forcing the dependencies on interfaces allows you to provide a variety of implementation classes that implement the interface's contract.

强制对接口进行依赖，可以提供各种实现了接口的合约的实现类。

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Pre-Sal Petroleo would also run a new contract system that allows the state to implement production-sharing agreements that would direct more of the oil windfall to the state than to the oil companies whenever the price of oil goes up.

FORBES: Brazil: Strategic Planning For Pre-Salt