Java Programming Tutorial - 32 - Arrays in Methods Video Lecture - Java

what is going on everybody welcome to
your 30 second Java tutorial and in this
tutorial I'm gonna be teaching you guys
how to pass a race in two methods now I
tell you guys how to make basic methods
and I also taught you guys how to use
simple variables and methods well a race
can be a little tricky so that's what
I'm going to teach you guys how to do
this time
so before we start passing arrays into
methods we actually need in array so
let's go ahead and make one again called
Bucky and just make your array
initializer and put 3 4 5 6 7
might as well and that's that for now so
now that we have an array we actually
need to build a method to do something
to this so here's your main method right
now so go outside your main method and
again make sure you're inside your class
by outside your main method and go ahead
and type public static void and then
name your method I'm just gonna name my
change because I'm gonna want to change
my array now what you need here is the
type and your local like how we built a
variable last time you wanted to do the
same thing but instead of having just a
variable name you want to put those
square brackets over it and that says
that all right we're gonna be building
the method here and it's gonna take a
parameter of one array so make sure you
name a variable which is actually an
array and add those square brackets and
that's how you tell that you're giving
me putting an array in here next go
ahead and let's add something so we can
put in our method that we just built so
in this method what do we want to do to
change our array let's just say we want
to take all the values in our array and
add 5 to them just add something real
simple so I can show you guys so just
add a basic for loop to loop through put
int counter make sure I spell it right
set it equal to zero because that's the
first index
counter is less than X length and
remember that's built-in thing that Java
knows and then just add one and let's
just put X counter and plus equal five
and what this does right here is it
takes um all the indexes in the array
and adds five to each value of them so
again you should know what this does
already don't forget to put it in a
separate method aside from your main one
so now that we got a separate method
built and again the most important thing
probably in this tutorial is in this
parameter in this method make sure to
have an array instead of just a regular
variable so now back in our main method
what we wanted to do is just call the
method so how you do this is put the
method name and in your parentheses go
ahead and write the array name so mine
is Bucky and again since Java already
knows how long it is you don't have to
put how many elements like four or five
all you have to put is the name of the
array since this is Bucky with this many
elements just put Bucky and it knows our
matically how many elements is supposed
to pass into your right so now our array
is changed so we made an array we
changed it so now we just got printed
out on the screen so we can see it so
let's use that enhanced for-loop that we
talked about in the last Oriole and once
I get my parentheses my again this is
called Bucky and let's just put
system.out.print line and we'll print Y
so that should work I believe so let's
go ahead and run this and as you can see
the original array was three four five
six seven and our new array is eight
nine
11:12 so it added five to the array
which we wanted to do so let me show you
guys one last time what this does
we made an array like we did a million
times called Bucky three four five six
seven we next said alright take that
array Bucky and pass it into the method
change or says alright where's the
method change oh it's down here so I
took that array now what am I supposed
to do to it Oh take each of the values
in add five - alright I did that now
let's come back here alright what do you
want me to do next well just print it
all out on the screen
and we know how to do that from last
time so make an array change it print it
out on screen and again the syntax is a
little different than making a regular
method so pay attention especially that
you don't need a number right here and
also that you need to define your array
right here
so aside from that it's pretty simple so
pay attention to that play around with
it and get good at it and then once
you're good you can move on to my next
tutorial so thank you guys for watching
I hope you learn at least some of this
don't forget to subscribe to my channel
and I'll see you next time