Program to an interface, not an implementation.
面向接口编程，而不要面向实现编程。
Program to an interface, not an implementation.
要针对接口编程，不要针对实现编程。
Program to an interface, not an implementation.
针对接口而写编程，不要针对实现。
Abstractions should not depend upon details, details should depend upon abstractions. Program to an interface, not an implementation.
抽象不应该依赖于细节，细节应该依赖于抽象，要针对接口编程，不要针对实现编程。
Abstractions should not depend upon details, details should depend upon abstractions. Program to an interface, not an implementation.
抽象不应该依赖于细节，细节应该依赖于抽象，要针对接口编程，不要针对实现编程。
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