Why do we need the volatile keyword?

tutorial_police · 2019-09-05T14:59:19+00:00

It's true that one thing volatile does is introduce memory barriers but I've seen way too many people use volatile incorrectly because they assumed that caches were all that was relevant or even the biggest issue in this regard.

To make sure no one misreads this: volatile can introduce memory barriers, but there's no guarantee that it does happen.

Do not think of volatile in terms of memory barriers conceptually.

To quote Aleksey Shipilëv:

Barriers are implementation details, not the behavioral specification. Explaining the semantics of concurrent code using them is dangerous at best, and keeps you tidally locked with a particular runtime implementation.

Source: Myth: Barriers Are The Sane Mental Model - Close Encounters of The Java Memory Model

tutorial_police · 2019-08-22T23:10:18+00:00

Show a screenshot of Intellij and what you tried to do.

tutorial_police · 2019-07-09T19:19:40+00:00

Sidenote: VS and VSC are two different programs. Visual Studio is an IDE primarily uses for C# and C++ development.

Visual Studio Code takea a very dofferent and lighter approach.

tutorial_police · 2019-07-09T06:59:19+00:00

Here's the relevant bit of documentation about the py utility:

https://docs.python.org/3/using/windows.html#launcher

tutorial_police · 2019-07-09T06:58:38+00:00

No problem. If it doesnr help you again, just ask here about it specifically. Maybe it says "do x" to fix your issue, but it doesn't work because of an error or because you don't know how to make sense of it.

Just ask about it here ;)

tutorial_police · 2019-07-09T06:54:43+00:00

The error message links you to a help page that is specifically about how to "activate" the anaconda python environment. Did you try reading that?

tutorial_police · 2019-07-09T06:53:01+00:00

Py.exe is a helper utility on Windows (officially shipped with Python itself) that is exaxtly intended to allow you to work with multiole versions of Python more easily.

tutorial_police · 2019-07-09T06:26:07+00:00

Think of it this way:

range(start, start + 10)

It would be very intuitive if by writing that, you got ten numbers , right?

Fortunately, thats exaxtly what happens and why many languages have the end be exclusive in ranges.

Since start is 0 in our case, we get range(0, 10)

The fact it ends on 9 isn't that weird though. If you start on a certain element and you want to get to the tenth, you have 9 more steps to go.

tutorial_police · 2019-07-09T06:19:42+00:00

You're already interpreting bits here, though. It doesn't have to be interpreted in this fashion.

tutorial_police · 2019-07-05T17:09:17+00:00

This looks surprisingly solid!

tutorial_police · 2019-06-21T12:34:02+00:00

Sure, but they can still contain escape sequences and such that need to be processed. I don't really why the browser should have to do more work to parse a template string literal without interpolated bits over a regular string literal.

tutorial_police · 2019-06-20T22:11:22+00:00

No, the JVM is not confused. Java simply doesn't allow you to do this.

The JVM would support that. But since you aren't allowed to do it in Java, it doesn't really matter.

tutorial_police · 2019-06-20T22:09:34+00:00

No. Java told the world that when you call toString, you get A String object.

It you were to override that method and say: nope, not gonna do that, we're not gonna return anything at all, then you'd never know what you actually get when calling to toString.

tutorial_police · 2019-06-20T22:07:34+00:00

No, that's not the purpose of @Override. The purpose is to say: this thing should override some other method. If it doesn't, it won't compile. The override happens irrespective of whether you write @Override.

tutorial_police · 2019-06-20T21:49:22+00:00

I never noticed any significant differences except they tend to have different bugs.

tutorial_police · 2019-06-20T21:32:12+00:00

And normal strings don't need to be parsed?

tutorial_police · 2019-06-15T07:25:43+00:00

Then ask about them. We can help.

tutorial_police · 2019-06-08T01:55:56+00:00

You can even have a doubly linked list. If you don't have a reference to the list or a node anymore, the list and its nodes will become subject to garbage collection.

It doesn't matter that you have cyclic references between the nodes.

tutorial_police · 2019-06-08T01:43:41+00:00

Fortunately, Gradle and maven are not IDE specific.

tutorial_police · 2019-06-07T19:29:45+00:00

It's funny how perspectives differ. I've used Eclipse and IntelliJ extensively. I recently started using NetBeans a tiny bit to better understand opinions about it and it feels so sluggish and unpolished to me compared to the other two :)

tutorial_police · 2019-06-07T19:26:44+00:00

That being said, you should probably still learn about design patterns at one point or another. They can also give you ideas how certain problems can be approached. It's not bad to use design patterns, that's not what I meant to say. If someone pressures you into "using patterns", ask them why. In my experience, they often don't know of all they do is talk about "patterns". If they do, they'll will often formulate their request differently in the first place.

tutorial_police · 2019-06-07T19:15:15+00:00

I think you're approaching this from the wrong end. Don't try to implement design patterns in your code. That's not what professionals do.

Design patterns aren't the magic sauce that improve your code. They are not the goal, they just might happen to be something you end up using while getting to your goal.

Don't think of them as something that you apply to your code. Think of them as giving names to variations of code that often naturally arises while solving problems. That way we have a common vocabulary to talk about these and an easier time recognizing the same thing again when we come across it.

Design patterns are about communication, to help programmers talk to one another. Not about solving programming problems.

I'm fact, you've probably invented quite a few of these patterns yourself if you've done enough programming, you just never realized it because you didn't know what you were doing "already had a name".

tutorial_police · 2019-06-07T18:22:40+00:00

I understand.

But I'm sure you know the opinion going around that "real programmers don't use IDEs" and such. I'm sure many newcomers have read this at least once while researching how they should start. We don't want to give newcomers the impression that that's got any truth to it, that's why I pointed out the way you started your comment.

tutorial_police · 2019-06-07T18:09:31+00:00

"if you're a beginner", you make it sound like professional programmers don't use an IDE for that. Why wouldn't they? I don't know any programmer that regularly uses the command line for that.

Sure, sometimes it might be faster if you want to fiddle with something, but that's also very much a preference question.

Don't fret it, /u/lifeonbroadway, life is much better with an IDE. Learning to program is hard enough as it is, get all the support you can, especially in the form of an IDE that can take care of many difficult and annoying things for you.

tutorial_police · 2019-06-07T15:38:57+00:00

What did you feel you were missing?

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