Java Programming Tutorial - 2 - Running a Java Program Video Lecture -

what's up everyone its Bucky welcome to
your second Java tutorial and in this
tutorial I'm gonna be teaching you how
to run a Java program now I'm not gonna
be teaching a lot of the syntax about
what's in a Java program before we do
that we actually needed to know how to
run one so pretty much you're just gonna
be copying me write a simple program and
then you're gonna be learning how to run
it so I'm go ahead and open any editor
I'm gonna open notepad plus plus just
because it's my favorite one and uh go
ahead and the first thing you want to do
is go to file save as and we want to
save this and remember whatever location
I already made a file on my right off my
hard drive in there I have a folder
called test and I'm gonna save this as
let's save it as YouTube YouTube da and
of course that Java is very important
and don't forget where you're saving
this this is also important so now we
have a file called anything dot job but
mine's called YouTube Java now I'm
pretty much just going to show you a
simple hello world program again in this
story I'm not gonna showing you like how
to write Java I'm just be showing you
how to run it and then the next couple
tutorials I'll show you what everything
means in it but for um beginners just
follow me the first thing you need to
write is a class now a class in Java
pretty much in Java everything begins
with a class and if you don't have a
class you can't do anything so you can't
do anything until you create a class so
I'm gonna go ahead and make a class
called apples and in that class we're
gonna have something called a method now
again you don't really need to know any
of this stuff I'm just making a simple
program I'm just talking you along
you'll understand what all this means
later but for now just stick with me now
in your class you're gonna have
something called a method now a method
is pretty much a list of things to do
and this method is going to be
inside the class now the first thing
your computer does is whenever it runs a
Java program and looks for a method
called main so let's go ahead and create
that and you did this by clicking public
static void main and all of these
actually mean something but uh again
don't worry about it for now
I promise you're understand then in your
parameter type of string args arg s and
put empty square brackets and uh i don't
know if i can copy this code in my
description or not but if I can't I'll
put it in my description but I got a
feeling YouTube's not gonna let me put
code in for security reasons
next after in your method you're gonna
want to have to put um a statement or
instruction about what you want your
computer to do so go ahead and write
system period out period print Ln and
what this does is pretty much print a
line on your computer now in your
parameters go ahead and write whatever
you want hello YouTube
now go ahead and save this and you can
go ahead and find a HelloWorld program
from somewhere on the internet again I
just uh talk to you guys through that
real quick I promise uh uh I'm not it
this isn't even part of the tutorial the
tutorial is just to show you how to run
this so I'll be teaching you about all
this means later so go ahead and this is
where the tutorial really begins go
ahead in the command prompt and the
first thing we need to do before we run
this program is actually compile it now
when we compile a program it pretty much
takes what we written and changes it
into something called a class file now
your computer can't read any files
called Java it can only read dot class
so that's a compiler job to take that
dot Java and change into something dot
class that your computer can understand
so right now what we need to do is find
this file and go find it you use
something called CD
backslash and what this does is take you
to the very beginning of your hard drive
and this is just a quick tutorial if you
never use command prompt for once you're
in your C Drive press dir and press
Enter
this is gonna give you a list that's
everything in your C Drive as you can
see one my directories or folders is
called test so let's go ahead and press
CD which means change directory to test
now we are in the test so again from
your C Drive press CD test
now press dir and see what's in this and
let's see YouTube Java so how do we
compile this YouTube Java well once
you're in your test go ahead and press
Java C which means Java compiler and
then press YouTube dot Java and this
means I use the compiler on YouTube Java
and then go ahead and press enter and
what your computer does is now if you
press dir we now have a apples dot class
so what it does is take that Java file
and change it into a class file
depending on whatever your name your
class remember I named mine apples so
now that we have a class file a file
that the computer can understand we can
actually run this program so let's go
ahead and type Java and that means run
this program and then type in the name
of your class which is apples and now
when you press ENTER it says hello
YouTube
so that's a quick tutorial on how to run
simple Java programs and again I can't
stress this enough
don't worry if you didn't get that
HelloWorld program that's not even the
tutorial I wanted to teach you guys
today the tutorial was learn how to run
these simple Java programs from the
command line and in the next tutorial
I'm gonna be clearing a bunch of things
up so just practice running a simple
program I suggest you just go ahead and
copy a HelloWorld program from the
internet somewhere and once you do just
practice running it
and if you have any questions you can
just send me a message on youtube or
leave a comment and I'll try to get back
to you but thank you guys for watching
hopefully now you know how to run a
simple program even though you don't
know what it means yet so again thank
you guys for watching make sure to
subscribe to my channel and I'll see you
next tutorial