Java中鸭子打字的例子是什么？ [英] What's an example of duck typing in Java?

问题描述

我刚刚听说鸭子打字，我读了关于它的维基百科文章，但我我很难将这些示例翻译成Java，这真的有助于我的理解。

I just recently heard of duck typing and I read the Wikipedia article about it, but I'm having a hard time translating the examples into Java, which would really help my understanding.

是否有人能够给出Java中鸭子输入的明确例子以及如何我可能会用它吗？

Would anyone be able to give a clear example of duck typing in Java and how I might possibly use it?

推荐答案

Java的设计并不适合鸭子打字。您可以选择这样做的方式是反射：

Java is by design not fit for duck typing. The way you might choose to do it is reflection:

public void doSomething(Object obj) throws Exception {

    obj.getClass().getMethod("getName", new Class<?>[] {}).invoke(obj);
}

但我会提倡用动态语言来做，比如Groovy，它更有意义：

But I would advocate doing it in a dynamic language, such as Groovy, where it makes more sense:

class Duck {
    quack() { println "I am a Duck" }
}

class Frog {
    quack() { println "I am a Frog" }
}

quackers = [ new Duck(), new Frog() ]
for (q in quackers) {
    q.quack()
}

参考

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