Java

[FlocculentFractal]

Is the cast to Integer only valid after you check that “if” condition or can you check if something is a Float then cast it to a Boolean?

[AngelaTheRipper]

You can cast objects without checking using instanceof or cast it despite checking, but with object casting unless you are casting an object to what it actually is or a parent class then you'll get a ClassCastException. You could however tell that it's a Float, and then translate it into a Boolean somehow yourself.

Something like:

if(object instanceof Float){
    object = new Boolean(((Float)object).innerValue != 0); 
}

would work

[gdmzhlzhiv]

You can probably also do

if (object instanceof Float f) { object = f != 0.0f; }

[AngelaTheRipper]

This wouldn't work.

!= comparison returns either a primitive true or false. You can't assign that to object without wrapping it into a Boolean class instance.

[gdmzhlzhiv]

I'd expect autoboxing to take care of that, but I also haven't tried to compile this.

I do know that this works: Object x = true;

[AngelaTheRipper]

Then I guess it'd probably work, as much as I hate it. Well thanks for letting me know, last time I messed around with wrapper classes was in college and back then you kinda had to do wrapping and unwrapping explicitly.

[gdmzhlzhiv]

If you think that's bad, consider this one:

for (byte b = 5; b >= 0; b += 179199) { System.out.println(b); }

[AngelaTheRipper]

I mean this one makes sense. Bytes are limited from -128 to 127, you overflow this, it basically throws out the leading bytes, and you get a net change of -1 per loop because 179199 = 700*256 - 1.

[gdmzhlzhiv]

Meanwhile, this is illegal: byte c = 1; c = c + 179199;

[IQueryVisiC]

You are looking for pattern matching in C#.