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Importing External Code
8:18Not all code is developed in the same environment. Let's learn how to bring in outside project into our shiny new IDE.
Okay, so remember that quiz
question from a previous
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course where I asked about a dunk tank?
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Well some of you didn't know
what that was and I apologize.
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It's a carnival game where someone
sits over a pool of water on a shelf.
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The carnival-goer buys the balls and
they throw it at the target.
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If they hit the target,
the person falls into the water.
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Now I'm sure you're imagining
putting me on that dunk tank and
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throwing the ball and
having me dunked into freezing cold water,
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because I didn't show
you these tools earlier.
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But, before you get too upset at me, let's
take a second to appreciate that you were
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able to code in Java without these tools.
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You didn't need these training
wheels on your editor.
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Let's be honest, most of the warnings
wouldn't have made any sense to you at
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all until you got started.
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Now, that being said though,
you can totally dunk me.
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I'm sure I deserve it.
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I did make you type a lot more than you
would have to in a real world situation.
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So let's just say at this point, I
definitely owe you three dunk tank balls.
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Alright, so let's import that very
long project that you painstakingly
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completed without code assistance in
the previous course, the karaoke machine.
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I want to show you how to bring outside
code into this new world order.
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Okay, so I've included a zip file of
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the source code from the final
project in the teacher's notes.
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If you want to get your own version, just
go to your workspace and choose File >
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Download Workspace, and that will send
down a ZIP file that you can then open up.
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So what I've done is I've downloaded
that ZIP file, I've unzipped it, and
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now I have that source code in a folder.
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Here it is.
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Now, since we're just hand
coding like this and there isn't
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any additional project information,
let's first just create a new project.
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Okay.
So, the way that you do that is,
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in IntelliJ you choose
File > New > Project.
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Okay.
And this is very much like the Create New
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Project that we saw before, and we wanna
just leave it, the Project SDK the same.
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We don't wanna do a template, right?
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Because we've already got our code that
we need, so we're just gonna go ahead and
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leave that unchecked.
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And we're gonna call this Karaoke.
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Okay.
So, it's possible to have multiple windows
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open with different editors and
that's what this prompt is asking.
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It's asking if we want to replace this
window or if we wanna make a new one and
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have them side by side.
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For our case,
we're just gonna use this one.
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So what it's gonna do is it's gonna get
rid of the systemizer window that we have
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and we're gonna put up the karaoke window.
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Cool.
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So, this is an empty project.
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By default, the project is set
up in a directory based format.
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When creating a project,
a default module is added for us, and
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that's what this is here, this karaoke.
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Now a module in IntelliJ is defined
as a discreet unit of functionality.
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Modules contain everything that is
required for their specific task, and
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they come with an .idea folder.
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This .idea folder.
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It contains files about how
you like your editor setup.
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They also have an IML file here, and
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it keeps project specific
settings in one place.
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The .iml suffix stands for idea module,
and the fact that all the settings are in
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a file like this, it makes sure
that teams can have the same setup.
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So I could share this with somebody
else and this setup would be the same.
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There's a little icon on this folder here,
on the karaoke folder here of this module.
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And that's saying that it's the content
root folder. This source folder here
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is short for source code.
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And it's blue you'll notice, and that blue
represents that it's the source root.
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All other folders are sort of orange and
yellow like that.
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If you're working with other projects from
idea users or even Eclipse projects,
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you can actually import
things really easy.
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So, you could get these IML files
from other people like I was saying.
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But what I wanna show you here
first is that when you don't
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have an existing idea project to import,
like we don't currently, right?
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Our karaoke project is hand-coded.
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You can imagine this as kind of converting
or upgrading to an idea project.
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These idea projects respond really
well to dragging and dropping.
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So, I'm gonna go ahead and I am gonna
grab the karaoke folder and our packages.
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And I'm gonna drag those and
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I'm gonna just click right inside
the source file here, okay?
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And it's gonna go ahead and
say move the specified references and
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that's fine, right?
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Cuz that was just a zip folder that I had.
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So I'm just gonna go ahead and move them.
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And it says open the moved
files in the editor.
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Sure, why not?
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Okay, and
it says they don't belong to the project.
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Okay I understand that.
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I'm moving them.
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And finally, I'm gonna bring this
songs.txt to the content root.
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Right?
So I'm gonna put it here.
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When we end up running this later and
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again it asks for
the same things here again.
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Before we were running right from
the start of the directory and
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this is relative.
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We'll explore this a little bit in
the future when we go to run this.
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But I just wanted to point out that we
don't want to drop it into source code
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folder, we're gonna put it in the content
root, and I'll show you why here in a bit.
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Okay, so, I really wanna show you
something that's gonna make you happy.
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So, you can set up these
different formatting rules.
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So, here's our Song.java file.
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Now let's say that when we were coding,
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we weren't the cleanest about things
about things that we kind of did.
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We move this over, got a warning up
here about the file is indented with
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two spaces instead of four, and that's
kind of the default here, in this world.
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And this is nice, right?
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Cuz if you have different team
members working on different things.
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So, I'm just gonna screw up the spacing
a little bit because, you know,
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we were rushing to get through this
before and the spacing wasn't quite done.
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So, let's go ahead and
come up here to code.
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And if you look down here in this code,
there's this Reformat code,
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and that is Option+Command+L on a Mac.
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So I'm gonna go ahead and
I'm gonna click that.
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Watch what it does.
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Boom.
Everything got set the proper way and
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now it's also at four spaces.
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But look,
everything's back to where it was.
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So, I am gonna do that again and
I'm gonna do that again and
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we'll just bring this guy.
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It's pretty good at not
letting me screw those up.
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So, I'm going to Option+Command+L and
everything is back to normal.
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So it's Ctrl+Alt+L in Windows.
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That's great.
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But what if I knew that I
remembered doing that one time, but
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I can't remember where it's at?
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So there's a great feature in
IntelliJ whic will be your friend,
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especially when you're learning this.
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If you press Cmd+Shift+A, or
Shift+Ctrl+A on Windows, and you choose.
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I know it wasn't Reformat.
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There it is, Reformat Code.
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And then, boom.
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And it will do it.
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And I have to break anything,
let's break something real quick.
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So, Control+Shift+A, Reformat Code,
boom, that fixed it.
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Great, right?
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So, we just did this file, but let's go
ahead and open up another file over here.
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Let's open up Songbook.
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So we can go ahead and
reformat the entire package.
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So, if I come up here to the source
folder and I say Reformat Code,
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we're gonna include subdirectories and
we're gonna leave Optimize Imports, right?
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So that's gonna remove any imports that
we didn't use, cuz that can happen, and
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we're also gonna choose Rearrange Entry.
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So, I'm gonna click Run.
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So, now all the files, and
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we can open them up by clicking
on them over here, are done.
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You also notice there's
some of these pluses.
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This is here to kind of help you read your
code quicker, but I'm gonna open this up.
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One more thing I wanted to show you really
quick is, on the imports over here,
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remember we put the dot star, and
I told you it was a little bit lazy?
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Well let's go ahead and let's put our
cursor here and let's see what happens.
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Look, there's a little thing
that popped up over here.
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This light bulb is called
an intention action.
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What happens with these intention
actions are they're suggestions
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of what could happen.
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So, let's go ahead and open this up and it
says, replace with single class imports.
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That's great,
that's exactly what we wanted.
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We just didn't want to have to type
all those out, so let's do that.
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And what it did was it took an
alphabetized order of everything that we
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used in here that was under that star.
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Pretty powerful tool, isn't it?
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Okay, we learned a ton there.
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And as I'm sure,
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you saw when you opened that menu up,
there are a lot more actions in there.
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We definitely aren't gonna hit all of
those, but in a bit, I'll show you how
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awesome the documentation is for
the IntelliJ Idea Project.
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You can dive in at your own pace.
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So let's go ahead and
take a quick break and I'll swing back and
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show you how to run our application.
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