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.