被认为有害的实例? [英] instanceof considered harmful?

问题描述

我正在查看一些大量使用 Java 的 instanceof 运算符的代码.我将抵制深入细节的诱惑，因为这是一个普遍的问题.instanceof 让我想起了 c++ 的动态转换，以及我很久以前读到的关于它的建议，如果你认为你需要它，可能你的模型已经关闭.这还是传统智慧吗?它是否适用于 Java 的 instanceof?

I am looking over some code that has heavy use of Java's instanceof operator. I will fight the temptation to go into details, since this is a general question. instanceof reminds me of of c++'s dynamic cast, and the advice I read about it, long ago, that if you think you need it, probably your model is off. Is this still the conventional wisdom? Does it apply to Java's instanceof?

推荐答案

是的，您走对了.虽然 instanceof 肯定有它的用途，但大量使用通常表明您的类设计有缺陷.

Yes, you are on the right track. While instanceof certainly has its uses, heavy use generally indicates that your class design is deficient.

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