1

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The value of Wahls is outputted to the console.



2

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OK.



3

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So this false value is the last value that be assigned to this value.



4

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Now I want to give you some examples about Constance.



5

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OK.



6

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If the value should never change during our programs run time you can use a type of variable called



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a constant.



8

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OK.



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To declare a constant use the final keyboard before the variable declaration and actually assign an



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initial value to that variable.



11

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OK.



12

00:00:32,480 --> 00:00:37,440

So now you want to show you some real examples about constants.



13

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OK.



14

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So here I declare an integer variable.



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OK.



16

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As you can see and I assign a value to this variable.



17

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So now I want to output the value of this roudy about to the console.



18

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OK.



19

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System that out that princeling and then insider practice's just referred to the name of this value.



20

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OK.



21

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And run your project as you can see the value of Pertti is now out with it to the console.



22

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OK.



23

00:01:05,660 --> 00:01:11,410

So now I want to actually assign another value to this variable.



24

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For example number 50.



25

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OK.



26

00:01:13,640 --> 00:01:20,090

So now I want to output the value of this variable to the console system that out that adrenaline and



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an inside Apprentice's just referred to the name of this variable.



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Ok so if I run my project now as against it's going to output the value of 50 to the console.



29

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OK.



30

00:01:31,460 --> 00:01:39,020

So now as I said earlier to declare a constant you need to actually put the final keyboard before the



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variable declaration and include an initial value for that value.



32

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OK.



33

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So here if I actually put the final keyword before the variable declaration as you can see is now showing



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me an error on the line 77 because this variable is a constant.



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And we cannot add another value to a constant.



36

00:02:00,820 --> 00:02:05,420

OK so this is a very important point about constants.



37

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So we must delete this line of code here.



38

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And as you can see the error is now gone.



39

00:02:11,510 --> 00:02:17,200

And if I run my project now as you can see it outputs only the value for the console.



40

00:02:17,270 --> 00:02:24,250

OK so now if I want to actually add another value to this variable as you can see it is now again showing



41

00:02:24,260 --> 00:02:25,180

us an error.



42

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And it doesn't allow us to add another value to this variable because this variable is a constant.



43

00:02:32,990 --> 00:02:35,960

And now let me give you another example.



44

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OK.



45

00:02:36,590 --> 00:02:43,520

So first we put in the final keyboard and then the data of are valuable and then we get our valuable



46

00:02:43,570 --> 00:02:44,080

a name.



47

00:02:44,090 --> 00:02:44,570

OK.



48

00:02:44,690 --> 00:02:47,580

And then we assign a value to our value.



49

00:02:47,630 --> 00:02:48,280

Okay.



50

00:02:48,560 --> 00:02:53,640

And then I want to actually output the value of this variable to the console.



51

00:02:53,690 --> 00:02:55,730

So system that out that's being stolen.



52

00:02:55,910 --> 00:03:01,640

And then inside Apprentice's just revert to the name of that variable and a comment out these lines



53

00:03:01,640 --> 00:03:08,150

of code and then run my project as you can see it outputs the value of this variable to the console.



54

00:03:08,150 --> 00:03:08,710

OK.



55

00:03:08,900 --> 00:03:15,090

So now if you want to actually assign another value to this variable OK.



56

00:03:15,200 --> 00:03:21,410

It doesn't allow us to do it because we cannot add another value to a constant.



57

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OK.



58

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And if you for example delete that final keyword as you can see here.



59

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Now the error is gone.



60

00:03:29,810 --> 00:03:30,300

OK.



61

00:03:30,410 --> 00:03:37,280

And if I put back that final keyboard as you can see here now it's doing me an error again because we



62

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can't assign another value to a constant.



63

00:03:40,910 --> 00:03:46,060

OK so that's enough for this tutorial.



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00:03:46,070 --> 00:03:53,540

We will be using these primitive data types later in the course when we are actually creating Java and



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Android applications.



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OK.



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So ask any questions that you want about these concepts.



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You can either message me or you can create a discussion in the course.



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And thanks for watching and I'll see you in the next tutorial.