There become the mechanism of together undertaking benefit and risk, which can effectively control both parties' behavior, and guarantee the smooth implement of contract.
这样就形成了利益与风险共担机制,有效约束双方的行为,保证合约的有效性。
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。
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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