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Channel: Gabriel Luchina - Universo Hackintosh

#Java

Українською

#Java типи данних

00:00:02

Hello everyone And today we will talk about

00:00:04

the Switch or the switch and we need to

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use it the Switch operator to

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select one of the many blocks of code to

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execute the

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pattern is very simple the

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keyword Switch then a certain

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expressin or a certain variable or a certain

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specific number and then a certain pattern

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case is translated as a case that is, in the

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event that we meet x, then we will

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execute some block of code, then Brick,

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that is, we stop the case of y, again a

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certain block of code Brick, we stop, and if

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you and I did not see any

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match, the default block will work

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and the default block will output some keyword

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and then Brick is also used for it,

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that is, everything is very simple And how it works, the

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expression itself is calculated once,

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the value of the expression is compared with the

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value of each case, if there is a match, the

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corresponding block of code is executed and the

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keywords of the default brick will be

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described further in our section, and in the

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example below, one number was used of

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the week to calculate the name of the day of the

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week. That is,

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pay attention. We have a variable intovaty,

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we enter it with parentheses and then we

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check. If our variable Day is

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listed as 4,

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we still do not know why it will be significant.

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That is, it will be checked by the candle and the

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variable it can be changed to be

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if 4 yes 1 7 10 as much as you like,

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exactly the one that our user initializes,

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and if the variable D is equal to one,

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then it will be output to the console, that is,

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Monday, and how our data will be checked,

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here is our variable D, it is equal to 4, and the

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first case the first is equal to one one

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is equal to four no this block is not

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fulfilled then our case is equal to 2 And the

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variable D = 4 is

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also not a coincidence this code block is not

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fulfilled then case 3 3 is not equal to

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four is

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not fulfilled and 4

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ks4 = 4 here we already have there is a match

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and we will have a Tuesday notification sent to the console

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and then the Brick will work. When

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we have a match and the block code

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has worked, all other checks will not be

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performed, no more checks will be

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performed, and this is the essence of

00:03:13

our candle. And from the point of view of the block diagrams

00:03:16

here too, everything is very simple. Today, we

00:03:20

developed the variable, what is its value next, it is

00:03:23

denoted as a rhombus, and then we

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have a check for the unit, we have already

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sorted it out, twos, threes and 4s,

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and it is the fourth block that will work,

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that is, here we do not have a match, all

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these blocks are not executed is not executed, and

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where the program saw a match,

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it enters this block,

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performs the actions listed here, and then the

00:04:00

program exits to the very end. And either

00:04:06

it completes its work or

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runs the following blocks outside the brackets of the

00:04:12

judgment candle, and when it saw a match,

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everything else should not be run in any case

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why exactly

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because the

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keyword Brick when all the scarves

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reach the keyword Brick it

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breaks out of the block of candles and this

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will suspend the execution of additional code

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and testing of the register inside the block and

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when a match is found and the work is done It's

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time for a break, no more testing is

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needed, that is, the program in we

00:04:52

worked out as quickly as possible

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And the break can save exactly this time of savings

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because it ignores the

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execution of all its other

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block of codes

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and the keyword default or

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default

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default is optional and defines a

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certain code to run if there is no

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match in the register Here we have

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a look the same variable is

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equal to four. But we have checks

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for the number 6 and the number seven, and we do not have

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any coincidence, and therefore the

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default block will work,

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which will display the notification looking forward

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to the weekend and that's all. How it works in

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our idea is very simple, that is, we have

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some variable, for example, the same model,

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which will be equal to, for example, seven

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semicolons and we write Switch in parentheses,

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we enter our variable D,

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then we put curly brackets and start

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case

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case 1

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colon Console in the rideline, for example,

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here I will display

00:06:13

Monday

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Brick and pay attention to the idea

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yourself for everything does everything for us. I just

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mainly press and it hurts. On the second day of

00:06:29

the week, we will have a

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Tuesday

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TH.com and the assistant does everything herself

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because she offers case 3 tab

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Enter tab we have the

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third day it's the third day of the day

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for us

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case-4 similarly

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we will already have Tuesday

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Tuesday I apologize

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semicolon

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tab case 5

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Enter and Fridays hurt

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Brick

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case 6

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Enter tab we will have a stator

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Brick and again case 7

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Console write Line

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and here we will have

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Sunday.com .ua

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and look at everything. In fact, the program

00:07:50

is done and I run it.

00:07:55

Here we have Sunday because the variable

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7 = our case with Everything.

00:08:13

the range of our values,

00:08:15

which we do not process in order to

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process all other cases, we must

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apply the default,

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that is, by default,

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a colon,

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and this is where we write Console write Line And,

00:08:33

for example,

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error,

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and in this case, the only thing is to put the furniture

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in this case, we have processed everything with you

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and nine and all other

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values will be shown to us already by PRO,

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so it is also very simple here, but this is

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such a typical program with you and me, and it is also with

00:09:02

you. Okay, cases can be nested,

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and we

00:09:09

will talk about the nesting of cases already when solving tasks, what does it

00:09:13

allow? And what are the advantages of nested

00:09:16

cases?

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I hope the topic of witnesses has become clearer to you,

00:09:21

and the only thing that needs to be noted is

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that

00:09:26

Switch is a multiple

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choice operator, that is, it differs from the conditions of

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our conditions, which are

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worked out using True Falls. And

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here we note certain specific

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coincidence and a certain specific case

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for this coincidence and that's all. That's why the investigators.

00:09:49

They are very interesting and next time

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you and I will solve the problems so that it is

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clearer how it was used

00:09:58

today. Thank you for your attention until the next

00:10:00

meeting

Description:

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