Java Video Tutorial 3: Variables and Arithmatic (Part1)

[dbb008]

Please use a real editor. Newcomers who see this video will think that Notepad is acceptable as a programmer's editor and never find personal fulfillment.

[01Feb2011]

You assigned myFloat twice?

Even though they're two data types wouldn't it cause confusing if you called them for a argument?

[Kbster14]

Nice vid, but bump up the sound on ur mic plz :D

[sniperx15rulz]

and what is char used for im soooo lost...i should just watch em all b4 asking questions

[sniperx15rulz]

wat is boolean used for like idk wat is true or false like watever u mean omg its so hard to say ummm welll....fail;

[sniperx15rulz]

bite myvariable lol =]

[supernova360]

thank you for the videos! keep it up!

[jomann18]

Thank you very much for your tutorials! I learned a whole lot today!

[MrCoolio0760]

You do a good job at getting into detail with each piece of code which is very helpful. You should pick back up on the series even though it's been a couple years. Great tutorials, thumbs up.

[mdsky]

Dude, you're so sweet ;) "Float can hold smaller numbers then double. Double can hold extremely big numbers, float can hold small numbers - OH - not smaller than - it still hold quite large numbers but not as large as double". Haha, love your videos!!

[wezternator]

You should be a Pilot - You have just the voice!

[BabyLatina1010]

definitly agree. it wouldn't compile if he declares myFloat twice, should have made his double variable called myDouble.

other than that, simple clean tutorial, great for beginners!

[YourHumanRights]

Thanks and great..  But you should probaby call the double variable "myDouble" instead of repeating "myFloat"

[hermesthephilosopher]

Awesome work. Clear and basic, thanks for this :)

[leperchaun76]

Aweet man this rocks!

[MrProgrampro]

Tyvm! You have so many, and I need to learn java! Sweet vid, 5 stars!

also, earrape 4:19 XD

[PaulKaizer24]

gracias gran aporte.

[mayavenkat]

Thanks! this really helped me out! and btw, i love your accent! :D

[med07]

if you run this what is the out put?

[sasuke2910]

Nothing, but I think it would return an error because he used the name "myFloat" twice(as a float and a double) I'm not sure if that's aloud in Java. I don't know that much about it(hence watching this tutorial :3). It works in some languages and doesn't in some. But overall great tut.

[AnitaLife27]

Thank you, aphonik!!! Yes...the 8 primative data types, as seen in this video, store values DIRECTLY into memory. A reference variable, such as String stores a reference to that variable. See D.S. Malik 5th ed, Java Programming, page 120. There's even a picture.

[stevieb6966]

fake

[whiteboy2k10]

Ugh! Vidoes like this annoy me on YouTube. If your gonna make a video please get your facts straight. A vairble does not store data it is a reference to data. Also, variables are not the core of a program. I have written many programs with no variable whatsoever, I just used value returning methods within algorithms

[Ozous]

your videos are awesome yar

can you suggest me a video tutorial showing

inputs during runtime please .

[emperusDS]

very good but that My float typed in twice was a bit confusing, btw you did a preety good job and ill keep on your series to the end :)

[ezklride]

byte -128 to + 127

short -32,768 to +32,767

int  -2,147,483,648 to +2,147,483,648

long -9,223,372,036,854,775,808 to +9,223,372,036,854,775,808

[sergeantRC]

HAHAHA byte myVariable!!!

thanks for the vid!

[madkimaster]

lmao i didnt see that at first

[liuupson]

int can store with in -65000 to 65 000.

[CoderSal]

Your copying michaels javas vtm.

[itsjareds]

Thanks, this finally cleared up my confusion.

[norzale]

thanks ! this is really useful

[shadowpal2]

i'm pretty sure he meant to say

"double myDouble = 10.746;"

He said he was kind of nervous because he only had 10 minutes, and it's pretty nervous in general just to teach whoever you're going to.

Good work though, I hope you put a video tutorial on input/output command lines(no JOptionPanes/Dialog Boxes)- I really really need help on those.

[xb0nzaix]

you left two myFloat variables heheh any way your tutorials are way more explanatory than my school professor =S good job!

[perktastico]

Anyone get this error?

found : double

required: float  float myFloat = 2.25; ^

1 error

It seems we can get around this by declaring a float as: float myFloat = 2.25f;

Although this seems silly to have to do! am i missing something?

[darkisback67]

i dunno but i am apparently missing it to because i have the same error....i dunno why but dude any one help? whats up? lol

[ruddyadam]

yeah it should say...

double myDouble = 10.746;

you probably got an error due to the duplicate myFloat entries.

no worries, though! ;)

[archer184]

Very good tutorial once again.

[GIGIMARZ]

his voice is not cleary.. sob

[kQr339]

Yo Thx alot

[typeracing85]

Great tutorial.

[farhanfyzee]

Man ur scripts are so nice i do you do it?? mine don't go in the same shape as yours help me!!

[jibrila]

good staff would mind speak up a bit your voice is too low bro.

[wjcb2006]

is it possible to hack other computers with java? i dont want to hack people i just want to protect myself

[JacobSijsma]

at 4:19 you would have better kept the microphone a little further away from your mouth.

[wonderful68]

i have learned more in 20 min with this than 3 weeks with books thanks.

[FarquinFimTimWimBim]

University Professors should come here to observe how it should be done. Shame on them.

Please give us a database connectivity tutorial in the same style. Unless you have to learn it yourself first in which case I'll glady wait.

[voidstuff]

this tutorials are really helping me

[tamrix]

nice, would be good with some syntax highlighting

and i dont think the complier thinks 'ab' is a string. Its only ever a string with double quotation marks as you pointed out early.

[barrrrrrrrrry]

When i compile the code in the video i keep getting the following error.

Variables.java:19: possible loss of precision

found : double

required : float float myFloat = 2.25; ^

1 error

i cant see anything wrong with the code it is as follows;

class Variables { public static void main(String[] args) { float myFloat = 2.25; }

}

[jimadams1968]

Barrrry, I believe that Float cannot hold a number with precision (decimal places). You should use double...or if you need to manipulate rounding and precision in further detail, use BigDecimal.

[barrrrrrrrrry]

I have found the answer to my problem; Firstly Floats DO hold decimal numbers, secondly all float values must have an 'F' at the end for example; myFloat = 2.25F;

I hope that helps anyone else who has the same problem.

[ronny22]

nice upload thanks man am ry to learn java ur vid came i handy

[aphonik]

There is no difference in those two statements, both the variables hold a value of 50. Only the data type differs. Bytes can hold values from -128 to 127. Int's can hold numbers from -2,147,483,648 to 2,147,483,647. So if I wanted to hold a value of 1 billion (1,000,000,000) I wouldn't be able to store that in an byte. I would however be able to store it in an int.

=]

[5h4rk]

So, if I want to store 100, it is recommendable to use byte instead of int? Or Short for 500? Thus we can save space on the memory? Is that right?

[aphonik]

That is correct, you will save memory space. However, just make sure you don't store a value thats higher than the maximum the data type can hold - or some strange stuff will happen =]

[5h4rk]

What is the diference between:

byte myByte = 50

int myInt = 50

?