Java 中是否有类似 instanceOf(Class<?> c) 的东西? [英] Is there something like instanceOf(Class&lt;?&gt; c) in Java?

问题描述

我想检查对象 o 是 C 类的实例还是 C 的子类的实例.

I want to check if an object o is an instance of the class C or of a subclass of C.

例如，如果 p 属于 Point 类，我希望 x.instanceOf(Point.class) 为 true 和 x.instanceOf(Object.class) 为 true.

For instance, if p is of class Point I want x.instanceOf(Point.class) to be true and also x.instanceOf(Object.class) to be true.

我希望它也适用于盒装原始类型.例如，如果 x 是 Integer 那么 x.instanceOf(Integer.class) 应该是 true.

I want it to work also for boxed primitive types. For instance, if x is an Integer then x.instanceOf(Integer.class) should be true.

有这种事吗?如果没有，我该如何实现这样的方法?

Is there such a thing? If not, how can I implement such a method?

推荐答案

Class.isInstance 做你想做的事.

if (Point.class.isInstance(someObj)){
    ...
}

当然，如果可以使用 instanceof 代替，则不应该使用它，但是对于反射场景，它通常会派上用场.

Of course, you shouldn't use it if you could use instanceof instead, but for reflection scenarios it often comes in handy.

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