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Another great thing that
IDEs provides is a way for

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teams to communicate about the current
state of the code in a project.

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There are built in version
conversion control tools that allow

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you to use a program like Get that push
and pull changes to a shared repository.

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So I've been working on that tree story
project that we started way back when, and

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making more dynamic using more of
the tricks that we picked up throughout

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our journey, and I'm really excited
to show you where it's heading.

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I'm not quite done with it yet,

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and I was wondering if maybe you
could help me wrap some of it up.

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The really nice thing that
IntelliJ offers is the ability to

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import an existing project.

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As we haven't yet

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covered version control in our adventures,
we'll just use a zip file.

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Don't worry though, we'll get
there soon enough, and when we do,

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we'll work together through
a shared repository.

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Until then, though,

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I've added a link in the teacher's
notes that I'd like you to download.

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So, go ahead and download it, and

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then extract the zip file
on your local machine.

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Okay, so let's choose Open,
so we'll choose File, Open.

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And then I'm gonna point to where
that extracted folder is at.

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So, that's in my Downloads, over here.

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And I opened my local TreeStory, I am just
going to click Choose and of course we're

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gonna say, do we want to have another
window open and keep both of these open?

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I don't think so, let's just do this one,
so we'll say this window.

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Put it up, cool.

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Here's everything, the project SDK is
not defined, so let's go ahead and

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click Setup SDK.

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Is the.

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All right, there, everything is all set.

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So I'm going to open
up the main over here.

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This is where we're going to run through,
okay.

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So, using the tools that
we've learned thus far,

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I was able to get things pretty dynamic.

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I'm not quite done yet.

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So, let's take a look at where I got.

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In Main, right here, if we do a little
walk through of where I've gotten to,

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I haven't really written too much
of the prompting code at all.

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But I've walked through the prototype and
it needs some finishing touches.

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Maybe we can work together.

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So, I put notes in here of
what I'd like to enhance and

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I hard coded some things here in Main
that, hopefully, we could just unwind.

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I just wanted to show how it was working.

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This first thing here, we want to
instantiate a new prompter object and

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prompt for the story.

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That's a to do here.

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The story template.

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So you'll see here that the story
template is a string and

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all the places where we
wanted to have spaces,

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I put double underscores to kinda fill
in the blanks, because that's the, and

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the text that's inside of it is
the word that we wanna ask the person.

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So, it kinda looks like a fill
in the blank thing, right?

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So, you just write the story this way.

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And we'll prompt for those things, okay?

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So, on the next line here,
we have this template.

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And to the constructor,
we pass the story, okay.

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And so, let's look over here,

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let's just make sure that I know what this
template is and open up these imports.

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Okay, we'll look over here in the source.

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Okay here, so here's template.

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So that's probably what
that's talking about.

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So we'll dive deeper into
template here in a bit.

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Okay, and after that I made some
very obviously fake results,

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I named them fake results,
and let's put these on here.

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Okay so, it says friend, talented,
java programmer, high five.

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So I'm pretty sure that
must fill up the story.

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Yep, very talented, I owe you a high five.

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Cool.

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And then we take this fake result and

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we call the render method,
which we'll take a look at.

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And it returns results and
we'll print out the results, there.

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And it says this should really
happen in the prompt or run method.

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I'll take a look at that here.

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Fix a little typo,
see the little green thing there.

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All right.

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Now, since this was imported,
all of the configuration's already there.

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So see,
there's already a main method here.

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So let's go ahead and let's run this and
just make sure that it works

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it's gonna take the fake data in the story
and says, thanks for helping me out.

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Your are really a talented java
programmer and I owe you a high five.

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Cool.
Pretty awesome, right?

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So, if we just made it so
that you could prompt for the story and

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then for each of the placeholders, we'd
have a super dynamic application, right?

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So, you prompt for the story,
prompt for the placeholders.

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Bam!
We got a tree story and

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it can be as dynamic as possible.

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Wouldn't be as hardcoded as we did in
the original version of this, right?

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So I'm getting pulled
off the project though.

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I got to go work on something else.

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I did the best that I
could to document things.

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And I also left some to
do's throughout the code.

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I used the format here.

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You'll see i used TODO:csd.

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That's my initials.

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This way you know that it's me talking,

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I was kind of leaving notes of what I
thought was left that needed to get done.

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Because I initialed it,

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you know to come talk to me if
these don't make any sense, right?

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So this is a great feature that lets
you track to do's on a project.

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And I want to show you a couple of things,
actually.

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If I press Cmd, and then hold it down,
you see how this bar down here showed up?

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I'm going to do that again.

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I press Cmd and
I hold it down and there it is.

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You can open up these different windows so
I'm going to open up to do's here.

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This is a list of all of the to
do's that are in the application.

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And if you click on each one of
them it will go in highlight those.

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Okay, so this is a great place to kinda
have gathered left what needs to be done

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in a project.

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This is a great way for
teams to communicate with each other.

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And obviously you're on my team, and

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here we are communicating about
what is left that needs to be done.

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So another thing that I
did was I wrote Javadoc.

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So if you highlight methods,
if we take a look at this render here and

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you click F1 on it just
like any other method.

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Click render, it gives you
the help that I actually wrote.

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And it says, given a list of values,
replaces the fill in the blanks in order.

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And the values are the replacements for
the fill in the blanks, and

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it returns the filled out TreeStory.

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Awesome.

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So, I'm going to show
you something else too.

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If you wanted to see where this
was defined you can press Cmd+B.

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Or Ctrl+B.

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And that's navigate to declaration.

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So I could have chosen Navigate,
Declaration, Cmd+B.

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So see the documentation
above that formatting?

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It's called Javadoc.

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It's a little out of
the scope of this course, but

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I just wanted to show you that it works.

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And you could actually
generate this using the IDE.

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And, it will generate
websites using this notation.

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So, actually the documentation that we
were looking at in, all of the Javadocs

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whenever we jumped over to the official
Java documentation is using this format.

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So as long as you follow this,
the IDE will then help.

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I'll do a future workshop on this, and

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I'll drop some information in
the teacher notes if you're interested.

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And vote up the workshop
if you're interested in it.

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Okay, so it's taking values
that are passed in array and

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calling format, calling String.format
on a thing called mCompiled.

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Okay, let's see what sets this.

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So I'm going to click this and
I'm going to press Cmd+B.

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There we go.

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Okay, so it's a private string, and
I'm going to press Cmd+B one more time and

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you can see this is where it's been used.

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So, mCompiled equals, so there,
it's getting set, so let's look at that.

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The line below is the one we did, but
this one here is where it gets set.

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Ok sweet.

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So where is this.

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This is inside of
the template constructor.

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Well let's go ahead and
lock this code in the debugger.

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I'm going to drop a break point on the
first line here on this pattern line here

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and I'm going to kick off the debugger
remember that was control D.

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Cool awesome so we're here already.

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If we look at the stack
we're over here in main.

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And we're passed in the story.

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Which is that right there.

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The story that thing's named for
helping me out.

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Okay so let's go back in to
the template where we're at.

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You'll see that it says init here that's
the way that it's saying that it's inside

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of the constructor.

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The initializer.

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All right, so to accomplish the finding of
the place holders, you know, the blanks?

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I decided to use a regular expression.

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Now you've seen the little
taste tests of these before,

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we use them to split up a string and
you might have seen a workshop on them,

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but if you haven't,
don't let them overwhelm you.

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They're a bit hard to grasp at first.

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It's normal to be a little bit confused,
okay.

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So here we're seeing a pattern and
it looks like this.

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Anything that has two underscores,
followed by any character that's not

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two underscores, one or more of them,
and then another two underscores.

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So we're looking for that, that is
the pattern that we're looking for.

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We then use the pattern object to create
a regular expression in the helper class

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called a matcher, which is here.

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So let's go ahead and let step, so

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now we have the text that's in here,
we've gone to the matcher, okay?

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So let's step again, okay, so

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it's got all of these tools down
here to keep track of things.

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It also has a method called find,
which will find the next matching pattern.

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Let's step into that loop a bit here,
press F8.

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Now we've entered the while loop, and
we know that method of find was true,

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because we're in the while loop.

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We know now that we found a thing,
and there's a method named group, so

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matcher.group is called.

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So let's look at that a little bit deeper.

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The way that grouping works in regular
expressions is that you can mark certain

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parts that you want to extract.

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So we wanna extract the name and
not the double underscore, so

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that's what these parentheses are about.

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We're saying this is
the group that we want.

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We want the value inside of here.

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Anything that is not two underscores.

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So, the way that this works is
group zero is the whole thing.

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Group one is the first set of parentheses.

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If you wanted more, you do one and
then two and then so forth.

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Let's go ahead and
use that little REPL tool.

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We'll say Evaluate Expression.

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And right here, if we say matcher.group(0).

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When we evaluate it,
we'll see that it returns name, but

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if we do group 1, it's just name, right?

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So it's 0th is the first one,
1 is the first parens there.

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So if that seemed intense.

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It definitely is.

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It most definitely is and
you shouldn't feel intimidated.

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Make sure that you check the teacher's
notes to learn more about regular

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expressions.

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They're very powerful and
definitely worth exploring more.

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Okay, so let's loop each one of these.

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Okay All right, so
the next label [INAUDIBLE] is adjective.

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What we're doing is we're populating
this mPlaceHolders, which is a list.

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Right, so let's take a look and
place holders here is an array list.

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We're populating it each time.

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Oh, we're populating each
one of the placeholders.

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That makes sense.

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Cool, so let's step outside of that.

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Let's break on this line here.

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We'll move to the cursor.

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Cool.
So we got placeholders.

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We have all the placeholders that
are in there and look, there's doubles.

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It's going to call a replaceAll
method on matcher,

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which is going to replace all the previous
matches, all those double underscores.

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So, let's do that, let's see what happens.

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Let's take a look of what incompiled is.

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Okay, it's the string format
that we've seen before, right?

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So, it's the %s and it's just
waiting to have some values put in there.

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So now let's go back
to that render method.

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Here's that render method, and
let's drop a break point here.

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And we'll just run to that.

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Okay, so mCompiled is that, and
that values from the outside.

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What do we got in the values here?

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So there is values, and

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they go right into those format spots,
so as long as we prompt for

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what those placeholders were, we can just
stick those values that the people answer.

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Great, so there we go.

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That's how it's working, but

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I'd love to integrate that prompter
object a little bit better.

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Let's take a quick look
at the prompter object.

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I am going to stop the debugger.

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I'm gonna click this little
arrow here to minimize it.

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Let's take a look at the prompter object.

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All right so in the constructor,
let's get up to the constructor here and

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in the constructor we're
building a reader all right,

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then it calls this method
called loadCensoredWords.

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Let's press Cmd+B to
see how that's defined.

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Right below it, so there's that, cool.

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So it uses the NIO style of files and does
a paths dot get resources censored_words.

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So resources censored_words, okay.

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So it opens up that file.

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There's the censored words
that we remember from before.

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Let's go back there really quick.

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Cool, so it pulls them all out and
it pulls them into a set.

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Right mCensoredWords here is a set,
a string set.

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Cool.

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That has that contains
method that we saw earlier,

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so we could see if the word
actually exists in there.

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All right.

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00:13:09,300 --> 00:13:11,950
Sorry to drop the project on you like
this but I really got something to do.

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I have to go set it up.

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00:13:13,780 --> 00:13:15,800
I think I've given you all
the info that you need and

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like I said there's to
do's left in these files.

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So if you look in the prompter
there's two here.

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So let's see let's print out the results
that were gathered by rendering

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the template inside of the run method and
prompter that makes sense and

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this other one let's see.

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Okay, so prompt for word.

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Prompt the user for the response to the
phrase to make sure the word is censored.

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Loop until you get a good response.

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Okay?

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Cool.
So go ahead and you'll get a passed in

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phrase and
all this stuff's documented here.

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I really got to get running.

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Sorry about that, talk to you soon.

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I wanted you to experience something here.

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Even though you might not have understood
exactly how I wrote this code,

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you did understand what it was doing,
after stepping through it.

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The better you get at this, the more
you'll be able to dive into projects and

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find your way around.

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00:14:00,860 --> 00:14:03,230
This is an important skill to
hone as a software developer.

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Many times you'll be thrust
into a code base and

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you'll have to figure out
how things are working.

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The more comfortable you start
feeling around exploring,

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the quicker you'll pick things up.

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Using the debugger to step through things
is a great way to learn what is up.

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All right.

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I know you can do this.

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Have fun.

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00:14:19,890 --> 00:14:23,410
And remember if you get stuck just use
the debugger to walk through things.

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00:14:23,410 --> 00:14:26,060
Hit the forum too if something's
confusing, your team will help you out.

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I've gotta set this up,
I'll see you right after the exercise.