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[MUSIC]

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Hello and welcome.

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I'm Craig, and I'm a developer.

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For this course, it doesn't matter if you
have any programming experience at all.

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I'll be introducing you to some
very common tools available in

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almost every programming language
that you might encounter.

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We'll be doing our exercises in Java,
and I'd like you to approach this

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as if you were attempting to
learn a foreign language.

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I'll introduce you to the rules or
syntax of the language as you need it,

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we will also discuss the oddities
that you might encounter.

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As we go through different
parts of this course,

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you'll start to recognize words and
concepts in other parts of the language

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much like you would in
a language immersion program.

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Just like when you're wandering around
a foreign country where you're just

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learning the language,
you'll come across words and

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phrases that you aren't familiar with and
that's okay.

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Focus on the topics we're covering and
don't worry about the other parts.

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As we're cruising along,
I might ask you to ignore some things, but

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I promise we'll get back to
it when the time is right.

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You might not have noticed it yet but
there is speed controls on your video.

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Please feel free to speed me up and
make a pretty good chipmunk or

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slow me way down as you feel necessary.

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I won't take any offense.

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I promise.

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Also, I've added helpful
links in the teacher's notes

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that will allow you to learn even more,
sound good?

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So without further ado,
let's get started with our task at hand.

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Just like most foreign language classes,

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the first thing we're going to learn
is how to introduce ourselves in code.

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So, what we'll do is we'll write out or
print, hello my name is, and

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then your name, to the screen.

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Speaking of introductions,

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allow me to introduce you to where we'll
be coding during this course, Workspaces.

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If you click the launch Workspaces
button right next to this video,

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you'll see a new browser open
with our programing environment.

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I'll head over there with you.

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So this is a Workspace,
and it's all yours.

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You'll see up here that there's a tabbed
interface of files that you have open.

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And over here is a list of files
that you have available to you.

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I've gone and created a file and

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got it all set up with a nice starting
point to begin writing our application.

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It's called Introductions.java.

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Let's open it up and take a peek.

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I've left a note or a comment right here.

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Comments in Java start
with two forward slashes,

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everything after the slash
was ignored by Java.

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So they're used by programmers to explain
what their code is trying to accomplish in

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clear English or to leave notes for
other programmers.

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Now one goal of programming is for
your code to be as clear as possible, so

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that it doesn't require comments.

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However, as we're getting started here
feel free to leave comments whenever you

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want to remind yourself of what it
is that we're attempting to do.

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Now, remember how I warned you
that you'll come across words or

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phrases that you aren't familiar with and
that I might ask you to

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ignore some parts of code until later,
we're at one of those points.

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Every Java program has some setup
that needs to happen and for now,

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I've done that for you.

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But don't worry about understanding
most of the pre-written code that's on

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the screen, it's just the setup that we
need to do to start writing our own code.

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However, the one bit of code I've written
that I want you to take a closer look at

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is this line right here.

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But don't worry exactly
about how this code works.

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What you need to know is that it creates a
Java object, which we'll talk about later,

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which has a method that
allows us to write out

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text to the terminal which is down here.

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I'd like to take a quick break and already
acknowledge, as well as remind you that I

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just threw out a mouthful of new terms
like objects and methods and like I said,

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don't worry, we'll cover them in much
greater detail in the following course.

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But for now, I just want you to continue
immersing yourself in this language.

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I'll explain the concepts when
they're important to the task at hand.

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So like I said thanks to the setup I've done, 
we have access to the console object.

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We can use this console object
to print text to the screen.

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Objects like console have methods
that let them perform actions, and

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the action that we want to do right
now is print some text to the screen.

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Console's method for printing text on the
screen is called printf, so let's use it.

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First we'll type console, and

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then a period to access its 
methods, then the word printf.

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We're gonna call the method
by doing open parenthesis.

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Now we're gonna do double quotes and
write the text out that we wanna write, so

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we're gonna say, hello my name is Craig.

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We're gonna end the double quote, and
then we're gonna end the parenthesis and

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then we're gonna put a semicolon to
signify that the statement is complete.

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You might have noticed that as I edited
the file there's a little dot up here

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signifying that the file has been edited.

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I'm going to go ahead and
I'm going to save from the file,

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I mean I'm going to click File,
and I'm going to click Save and

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you'll notice that in the future you
can use Cmd+S or Ctrl+S on a window.

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Okay, so let's see our code in action.

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Now, Java is a compiled language,

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which means that we have to run a compiler
program to turn our human readable Java

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code into computer readable
code before we run it.

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So let's compile our
introductions program.

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To do that at the console,
we type javac and

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then the name of the file
which is Introductions.Java.

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Java C is short for Java compiler.

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So this line is telling the Java
compiler to convert or compile

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the code in the file Introductions.Java
into an executable file.

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So I'm going to press Enter.

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And if we take a look at the files in
this directory using the LS command,

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see that there is now a file
called Introductions.class.

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By the way, I should mention here
that LS stands for list, and

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it allows you to list
files in a directory.

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We're gonna use a few terminal
commands on this course, and

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I'll teach you everything
you need to know for it.

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But if you wanna learn more about
using the terminal, check out our

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course called Console Foundations
which is linked in the teacher's notes.

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Now to run our program,
we simply type java Introductions.

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Now notice the command that I
type here is java, not javac.

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Java runs the program it only needs the
name of the class, without the extension.

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Javac required that .java,
and Java does not.

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So I wanna press Enter.

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And here on the screen we see our output,
the introduction.

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Great job.

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We now have our first compiled program.

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You've been learning a ton.

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Before we move on and learn even more,

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let's do an exercise to review some
of the things we've learned thus far.

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Before we get there, let me just remind
you that there is a community that you can

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and should lean on while
going through this course.

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If you have questions,
it's likely someone else has them too and

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has maybe even answered them.

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Learning how to ask questions and

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find answers is in my personal opinion
the best way to learn anything.

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If you're coming to this course
with some Java experience,

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you might have used an IDE or
Integrated Development Environment.

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Now those are a set of tools which
greatly simplify the development

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process through code completion and
many other bells and whistles.

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As handy as IDEs are,

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I'd like to request that you still
follow along in the Workspace.

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As I think there's benefit in learning and
gaining confidence in doing things

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all by yourself and
removing some of the magic of that IDE.

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We'll go over IDEs in a future
course when the time is right.

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Okay, now back to that exercise.