August 2021
Intermediate to advanced
450 pages
4h 46m
Chinese
Content preview from 面向对象的思考过程（原书第5版）
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8.3.4 编译器佐证
我们能否证明（或反证）接口具有真实的is-a关系吗？在Java（C#或VB）可以使用编译器来证明。请看以下代码：
当编译器编译这段代码时，会抛出以下错误：
显而易见，狗并不是头。不仅我们知道，而且编译器也同意这一点。然而，以下代码如预期一样工作：
这是一个真正的继承关系，所以不必惊奇这段代码可以通过编译，因为狗就是哺乳动物。
现在我们可以对接口进行测试。接口是不是真正的is-a关系呢？编译器是这样认为的：
这段代码工作正常。所以我们可以安全地说狗是有名字的实体。这是简单但有效的证据，继承和接口都构成is-a关系。如果接口使用得恰当，接口之间的关系，更像是“表现得像”的关系。你可以有实现一个“is-a”类型的数据接口，但是更多时候，你会选择前者。
Nameable接口 ...
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