The Nineteenth Byte

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DJMcMayhem

11:01 PM

@Downgoat multiple inheritance is bad? Like A --> B --> C ?

Downgoat

@DJMcMayhem multiple inheritance is like: A extends B and C

Anonymous

Multiple inheritance can cause some headaches (e.g. diamond problem), but there are solutions to them

Pavel

Java has interfaces with default methods now, which is basically multiple inheritence.

Downgoat

@Pavel interface with default method = abstract class ._.

Pavel

Yes

They're basically the same thing now.

Except you can only extend one abstract class

Geobits

11:07 PM

@Downgoat Kinda like that but without the cast. You don't want it to actually be an Object.

Downgoat

@Pavel is Java supposed to be backwards compatible?

Geobits

And no ability to cast it to one or the other.

It just is one or the other, decided at runtime when used.

Pavel

@Downgoat Java is backwards compatible with code written for 1.4

Downgoat

@Geobits but if it's an Object, then you for sure don't know what type it is?

Geobits

But you could cast it.

Downgoat

11:08 PM

exactly

Geobits

Or instanceof. That's cheating

It should be both and neither until used

Downgoat

CS Teacher: You cannot use ternary because AP test don't allow.
AP Test: You can use any feature of Java as long as you use correctly.

Pavel

It's not that the AP test doesn't allow

Downgoat

I should probably try petitioning school to see if we can get another CS teacher

Pavel

It's just that the person grading your test has no idea what the ternary operator is

quartata

11:10 PM

weren't you doing ap cs back in 2015 how long is your semester

Downgoat

@Pavel AFAIK they put into computer and see if it work

@quartata no, I started in like September 2016

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Pavel

@Downgoat No, someone untrained in CS looks over the paper copy.

They aren't going to start executing arbitrary code written by students.

Downgoat

¯\_(ツ)_/¯ AFAIK I can get a C and still get a 5/5 on the test

@Pavel haha, I'm surprised they're that smart

CS teacher randomly runs our code, lemme see if I can get access to gradebook

Dennis

$ cat gradeobok
cat: gradeobok: No such file or directory

Downgoat

11:13 PM

oh hey look how convenient

Pavel

@Downgoat Correct, in order to get a 3 on the APCS test you require 40% of the points.

My teacher used to be on the commitee that writes the AP tests.

Downgoat

oh my god how low are their standards

Question: is there program to obfuscate a .jar file?

so it can't be decompiled to anything meaningful

Pavel

> License

Don't use this for evil, please!

Downgoat

Evil =/= getting back 4 points because CS teacher don't know what ternary is

Dennis

@Downgoat Code obfuscation is always reversible. If a machine can understand it, so can a human.

quartata

11:15 PM

@Downgoat No. Best you can do is obfuscating the class names

Pavel

I tried to do as much of the AP practice test as possible with Java 8 streams/lambdas

Downgoat

Feb 14 at 20:05, by Downgoat

Pavel

I got a 4

Downgoat

@Pavel haha that's awesome

oh that reminds me: CMC: shortest bounded Java Bogosort

quartata

I legitmately don't see anything wrong with that. AP graders grade tons and tons of tests: they can't be bothered to read code that closely

Pavel

11:17 PM

They don't higher AP graders who know the subject.

That would cost more.

quartata

They'll skim it and if your stuff looks like Haskell you won't get points. Pretty simple.

Downgoat

@Pavel do you know what you got on MC vs FR?

Pavel

I don't remember, I just remember completely tanking FR.

I think 90~ on MC?

I was completely out of it by the end tbh

Tests are boring

Downgoat

huh

I suck on multiple choice because I don't bother to handtrance int mystery(int x)

quartata

On any AP free response (or really any test) you should make it as easy as possible for the grader to be able to just skim and give full points.

Downgoat

11:20 PM

I DONT CARE WHAT MYSTERY DOES AND IF I SEE A FUNCTION LIKE THAT IN WORK ENVIRONMENT I'M QUITTING

Pavel

This was the Practice Test, we just graded our own papers.

Apparantly part of the checklist for getting points includes the way your code is written, not just if it works or not.

@Downgoat public class MysteryG extends MysteryD implements MysteryF,MysteryB

Geobits

@Downgoat You should find a different career then :P

Cause it's gonna happen.

feersum

Oftentimes, more functions are mysteries than not.

Downgoat

@Geobits pls share what part of code base has function like:

int mystery(x) {
    int y = 0;
    int z = 1;
    while(z < x) {
        if ((x - z) % 2 == 0) y += z;
        else y -= z;
        z += x - y;
	}
    return y;
}

and please solve for input 6 by hand

Geobits

I'm telling you, if you don't want to see ugly mystery code, you really should do something else. It's everywhere.

Downgoat

11:28 PM

yeah but solving by hand is unreasonable

mystery code is not problem everyone sees it

but random arbitrary code to solve by hand is just AP test makers running out of ideas

Geobits

Expecting college test to mimic the real world is silly anyway. I mean, it'd be nice, but not normal.

Pavel

@Downgoat 3/10, indentation isn't screwed up enough.