02 - Core Java/004 First code in Java_en.srt

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(piano music)

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-: Now once we have our setup done, it's time

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to write our first code.

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That's right.

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So finally we are going

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to run our first Java code here.

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Now for that we have to open our editor.

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So of course in the last video we have discussed

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that we are going to use VS code.

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So let's open VS code here.

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So I will say code.

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Okay, so our VS code is all set to write our first code.

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You can see it, it will give you a welcome screen

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when you do it and then it will ask the preference,

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do you want a light color, dark color, dark, high contrast

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or light high contrast.

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I would say go for dark because it's good for development.

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It will not strain your eyes at least.

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So let's close this.

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Get started and this is how your VS code will look like.

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Okay, simple stuff.

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Right now what we'll do is first of all

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where you will get your folder.

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So you will see your folders on the left hand side.

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So this is where you will get your project,

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all the files which you want to work with.

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So you'll be having that here.

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Now of course in the upcoming tutorials,

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we'll be using a different IDE

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and I want you to get used

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to different IDs when you work with.

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So on the left hand side we can see we have an explorer here

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and then we, if you want

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to search something, we have it here.

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If you want to add some extensions, which we are going

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to do later, we will add certain extensions to work with.

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At this point, we don't need any extension,

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so just keep it blank.

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I mean, no need, no need to install anything here.

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In my machine I already have something

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on some other accounts,

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but on this account I don't think so.

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Anyway.

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And then if you want to run

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and debug it, you debug, you will find the option here.

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Now why do we run of, of course we know what

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to, why to run, right?

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But why do we debug the application?

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Yeah, we'll see that later.

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At this point,

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let's open our files of explorer here.

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And this is where I want to create my first project.

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Now, how do we create a project?

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Now project will be a very broad term at this point.

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What we are going to do is we will create some files

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and of course when you merge these files

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and libraries, you create a project.

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At this point we do, we are not working

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with any external libraries.

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At this point,

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we are just going for a simple files, okay?

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Hello world, right?

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So for that

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what we'll do is we'll click on open folder

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because all these files will be part

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of one particular folder.

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So we'll click on Open Folder

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and it'll give you certain options

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where you want to save this.

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So I will save this in my desktop itself.

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In fact, on my desktop I want to create one more folder.

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So I will say open folder again, inside desktop I will,

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I want to create a folder here.

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We'll say, this is, I will have a short name,

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we'll say, Course, Create and Open.

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So you can see we got our course folder here.

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What I will do is I will zoom in in inside my VS code so

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that you can see everything properly.

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And again, the recommendation would be

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to watch this on a bigger screen so

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that you know you can actually

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understand each and every line.

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Because in mobile, sometime you will be seeing a font size

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and a small font.

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I don't want to see this page every time I open my VS codes,

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so I will just uncheck this and click on close here

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and let's create our first file.

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And this is where you are going

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to write our first code, right?

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So we have already seen how do we install JDK, how do we

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check the version on the terminal?

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Can you do that in this?

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So VS code itself has a terminal here, so you don't have

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to open the external terminal.

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Of course if you're using Windows,

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you'll be having an option of command prompt.

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But let's click on terminal here

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and you can see we have an option

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of terminal, click on this one.

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This is where you can enter your commands.

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Whatever commands you have.

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The same command we'll write here.

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So we'll say Java version

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and you can see I have Java 17 in this machine

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and Java 18 is already released.

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But then Java 17 is the LTS version.

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So when you say LTS, it means long-term support, right?

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So we'll use that and we'll also check if my

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Java C is working.

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You can see Java C is also there.

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Now Java C basically stands

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for Java compile as we discussed before.

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So we need both.

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We need Java to run the application, we need Java C

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to compile the code, right?

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Okay, cool.

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So we got the number as well,

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I will just minimize this a bit.

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Okay, so now let's create our first file.

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So what we are going to do is we'll click on this particular

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file here and we'll name this as hello.java.

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Now there is something you have to remember,

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whenever you create a Java project, you have to make sure

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that you give an extension or Java files.

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Basically you have to give an extension with dot Java.

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Now different languages have different extension.

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When you talk about C, we say dot C,

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when you say C plus plus language, we say dot CPP.

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When you say Java script, we use dot JS.

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In the same way,

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in Java we say.java, simple stuff, right?

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So you've got our file here.

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Now VS code will give you some suggestions.

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We'll ask you to install some extensions for Java

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and we'll click on recommendation.

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Okay, it is asking us extension pack for Java,

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which will help us,

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it will give you some options and extra stuff.

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Again, this is just an advantage which you get from VS

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code, again, not required.

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If you don't want to install this extension,

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I think I should go for it.

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We also have intelli code for AI assistance.

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But yeah, we'll stick to this extension.

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Again, in your machine, you don't have

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to install this, there's no compulsion.

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You can still write your Java code,

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but maybe it will give you some

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suggestions and stuff in between.

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Let's see, let's close this and let's write our code.

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So extension will be installing behind the scene.

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You don't have to worry about it.

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So basically how do we write our Java code?

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It's very simple actually.

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First of all, the question is

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what do you wanna do in this code?

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Do you want to create a game

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or do you want to build a rocket which will go to mass?

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I'll not be doing those extra stuff.

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What I will do now is I will create a very simple file which

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will print hello world.

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I know, that's how you start a programming language, right?

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It is irrespective of which language you're learning,

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the first thing you do is you print hello world.

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So here I want to print hello world.

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Now how do we do that?

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See if you, in case if you are coming from other languages,

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let's say Python, right?

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So what you do is if you want

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to print hello world in Python, you can write only one line

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and maybe Java is not that famous

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for simplicity at the start.

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Of course when you build a bigger project,

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Java is much more structured compared to the languages.

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But then to start with, it's not that easy.

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So just bear with me.

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So what we are gonna do now is

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if you want to just experiment

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with Java, if you want to play some, if you want

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to test some code or stuff,

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we have an option which was introduced in Java nine.

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So basically you can write your code, in one line

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you can get the output example.

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So even before we jump to hello

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world, let me show you something.

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So we have a op, we have a concept of J shell in Java.

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So it was introduced in Java nine as I mentioned.

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So you can open your terminal

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and here let me just increase the size a bit.

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So what I will do is I will click on J shell

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or I will type J shell and it will give you a

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J shell prompt.

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Now J in this case is Java.

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So you can it make, it should make sense now, okay?

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So what you can do in Jshell is if you want

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to experiment something, example, why do we write code?

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Why do we build application?

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So to solve problems right, now it can be a

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very simple problem as well.

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Example, if you want to add two numbers, it's very simple.

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You can say two plus three.

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And if I say enter, you can say we got five, right?

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So we got the answer which is five, what if you want

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to do a subtraction, you can do that.

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So nine minus six, and you can see we got three.

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So this is working, but what if you want to print something?

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So in this case what you can do is when you were in Java,

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if you want to do something,

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we use something called methods.

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At this point, you don't have to remember methods on

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what the definition is.

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Just remember that there's a concept called methods

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using which you can do something.

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The only thing you have to remember is if you want

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to do something, you need methods.

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In the same way, if you want to do something here,

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I want to print something, right?

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So we have to use a method called print.

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It is a inbuilt method in Java so you don't have

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to worry about it, just use it, it will work.

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So whenever you call methods, you have to parse the values.

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So I want to say, hey print,

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but then it will say okay, I will print,

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but what you want me to print?

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So you can mention that in this bracket.

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So in this round brackets, you can mention I want

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to print hello world.

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Now if you want to just print a number,

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let's start with that first.

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So let me just print a number, which is six.

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And in Java there's one more thing.

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You have to put a semicolon at the

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end, it should work in this.

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But then living with this, at the end put a semicolon.

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That's how you mentioned, hey, something is getting ended.

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So we've got a semicolon there.

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And now what you can do is let's try to run this code.

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Now errors, right?

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Error are very important in your life,

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in your programming life,

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basically you see you got the error.

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It says cannot find a simple call print, it's not working.

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Okay, cool, no problem.

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So let me just clear the screen.

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A clear comment is not working, ignore that.

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So let me open Jshell once again and let's,

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because I just want to keep it on top.

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So what I will do now is if I want to print something

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and I want to print a value six at the end,

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I want a semi colon as well.

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Now Java says if you want to call print,

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print belongs to something, right?

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So it it when I say it is available inside Java.

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So the statement you have

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to always mention is system.out.print again.

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See there will be a point where you, I will, will talk about

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what is system, what is out.

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At this point it's very difficult to understand.

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So just bear with me.

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This is a statement which you have

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to use if you want to print something on the console.

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So if I want to print something here,

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just say system.out.print

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and whatever value you want to pass, say enter.

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You can say we got six,

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but what if you want to print hello world,

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I don't want to print six.

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So if you want to repeat the same statement,

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of course you can type or you can click on the up arrow,

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it will give you the option.

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Now here if you want to print hello world, you have to put

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that in double codes.

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So whenever you want to do something with text,

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see numbers are easy to use, you can simply say six.

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But if you want to work with a text, you have to put

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that in double codes the way I've done it here.

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So in this double codes you have

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to mention hello world, right?

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That's how you start a programming,

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programming journey, right?

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I will say enter and you can say we got hello world,

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what if I want to print something

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else, which is very simple.

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You can say double codes, not being ready, Telusko.

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And if I say enter, you can say we got the text.

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So whatever you want to print, just put that in double codes

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and it should work.

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And you can see we are getting the output as well, so cool.

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So we are able to do this with the help of J shell,

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but will it work in this?

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If I try to copy this, in fact why

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to copy it, we can type it.

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So let's type system.out.print.ln,

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and here we'll say hello world

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and let's give a semi colon

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at the end, it was working on J shell.

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But when you work with Java files,

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because this is how you build a project, right?

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J shell is not to build projects,

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it's just for the experiment.

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If you are learning a language, it is good,

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but if you want to build a big application,

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say dot java file and write your code there.

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So let's compile this code.

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Now how do we compile?

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Okay, so there, there are two steps you have to follow.

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First, when you write a code, you have to compile the code

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and then you can run the code.

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So to compile the code, you can say Java C in the terminal,

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and let me just increase the font a bit.

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So you have to say Java C

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and then you have to mention the file name.

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So first you have to be make sure

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that you are in a correct folder, which is close.

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You can see that this is a folder we have

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and then you have to mention Java C.

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And then the file name.

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The file name in this case is hello.Java, click on enter.

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Oh, we got an error.

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Okay, so it says something is missing, you know,

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something else was expected

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and you are giving this, this is not working.

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So this is not how you write applications

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or code in Java file.

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We have to do something else.

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But at this point we have understood right?

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How do you work with Jshell?

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So you can, if you want to do something with Jshell,

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just write a code, it will work.

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If you want to add two numbers, it will work.

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You can't do that here.

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We have to do something extra, and what is that something,

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that we'll see in the next video.