Java可以在Objective C中做类似的事情吗？
请考虑以下情况：
Object > MyClass > MyClassA, MyClassB
例如，如果我想要对象级别的东西，我添加了printDetail（）;我怎么能在Java实现中做到这一点？此外，我可以覆盖所有Object的方法。例如，我需要一个全新的.toString（），我可以覆盖它吗？谢谢。
If I want something in the Object level, for example, I added printDetail(); How can I do it in Java implementation? Moreover, can I override all the Object's method. For example, I need to have a whole new .toString(), can I override it? Thanks.
不，它不能，不管怎么说。 Objective C是一种动态类型和范围的语言，使其非常适合类别等功能。您可以在Java中最接近的是通过字节代码操作库（如 ASM 或Javassist 。
No it cannot, not really anyway. Objective C is a dynamically typed and scoped language, which makes it very amenable to features like categories. The closest you can come to this in Java is class instrumentation via a byte code manipulation library like ASM or Javassist.
但实际上，强烈使用时类似于Java的OO语言你应该接受它的功能，而不是试图复制另一种语言。
But really, when using a strongly typed OO language like Java you should embrace its features rather than trying to duplicate those of another language.