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Video tags
Subtitles
Russian
00:00:14
hello everyone welcome to00:00:16
this session 3 in java where we are going to00:00:18
discuss and talk about the types of data00:00:20
that we can manipulate with this00:00:23
language so it is a video which00:00:24
should not be very good but which I wanted to00:00:26
make to show you all the types00:00:28
of data that we will subsequently manipulate00:00:29
in the next session when00:00:31
we will address the very00:00:33
important concept in programming which00:00:35
concerns variables I have00:00:37
summarized all of this for you in a table to00:00:38
go more quickly at the level of the types of00:00:40
data that 'there is not necessarily00:00:41
all of them handled at the start00:00:43
anyway and you can if you want to00:00:44
take a screenshot or write them down on00:00:46
both sides if you obviously want to00:00:47
recover them then here they are in terms of the00:00:49
types of data that we are going to in any00:00:51
case which are available that we00:00:52
can manipulate with this language that00:00:54
you have in this table00:00:55
roughly speaking we have types a00:00:59
special type that I didn't know if you00:01:00
have never programmed in your life which00:01:02
is the Boolean type a ball a it is00:01:04
quite simply a piece of data which can00:01:06
take on a value it will take on the00:01:07
true value of agreement which we always say00:01:09
in English which in fact corresponds to the00:01:11
number 1 where the value falls for fo which00:01:14
corresponds to the number zero so that we will00:01:16
use what we therefore call00:01:18
primitive types and among these00:01:19
rimitti types we have precisely this00:01:21
boulin type which will handle that I have given you00:01:23
for each of the titles in this table00:01:25
the associated object type we will not see what00:01:27
you know that java is a00:01:28
object language as I explained00:01:30
that they use a lot exclusively this paradigm and you00:01:33
will see that we will be able to use00:01:34
classes associated with the primitive type00:01:36
to manipulate a whole bunch of things this00:01:38
will happen very quickly since in the00:01:39
next videos we will already see00:01:40
how to build a first class00:01:41
in java and how we manipulate a little00:01:44
bit of all that attributes writing00:01:46
methods or that kind of thing00:01:47
so that's roughly the team that you00:01:49
need to know the bytes type00:01:51
and if you really want to store a00:01:52
very small number of agreements see that the00:01:54
name but here on the range of value00:01:55
can be from -128 whose canon negative to00:01:58
127 so if for example you want00:02:00
to store the many 10 you want to00:02:02
store a number which does not debate which will not go00:02:03
never below -128 and beyond00:02:06
127 you can use this type byte00:02:08
here okay the place in memory what00:02:11
I like here is quite simply00:02:13
the occupation of the place it will00:02:15
take in your RAM and know00:02:17
you have ram sticks on your00:02:18
computer for those who know it00:02:20
or who do not know how to play it00:02:22
explains now and in these00:02:23
memory sticks we have perhaps00:02:25
4 gigabytes of ram00:02:26
16 32 or more sure maybe even less00:02:28
than less than 4 you have a certain00:02:30
number of places okay so we00:02:32
you get gigabytes if you have for00:02:34
example 4 gigabytes of ram you have 400:02:36
gigabytes of memory that is to say you have00:02:38
4000 megabytes of memory and so00:02:41
much more to opt for in May month and there00:02:43
I put you in memory the place00:02:45
occupied by each of these types00:02:46
so it is not enormous at all00:02:48
compared to current computers with the00:02:50
memories that we have but at the time00:02:51
it was very very very important for all the00:02:53
same trying to always00:02:55
keep this habit of always choosing00:02:56
the type which will take up the least space00:02:58
possible in memory because if one day00:03:00
you have to work00:03:01
on embedded systems systems00:03:03
which will have that a few megabytes see00:03:05
kb of RAM00:03:07
at that time the fact of the a2 concept00:03:09
of considering counting each byte00:03:11
used at the level of the memory will be00:03:13
important then we have therefore I00:03:15
come back for sure the types that00:03:16
I had said therefore the thibout some which00:03:17
is a particular type we only have the00:03:19
buy type to really store a very small00:03:21
integer an integer but really00:03:22
quite small we have other types of00:03:24
variables to find other names we have00:03:26
the short the agreement which takes a little more00:03:28
space we both opted that he saw there00:03:29
can store a number already a little00:03:31
larger but there if for example you00:03:32
store the number 1 million it would be00:03:34
impossible to store in a short we00:03:35
would have a memory overflow in in any00:03:37
case an overflow of capacity00:03:38
compared to this primitive type we will at that00:03:40
moment be obliged to use a00:03:42
slightly larger type which is for example int00:03:44
and see that lindt we can already store00:03:45
counts a little larger and so00:03:47
on the long one okay and we have00:03:49
the two types float and doble for00:03:51
real numbers okay everything that is00:03:52
comma numbers so00:03:53
decimal numbers that can be useful and you00:03:55
see that depending on the number you00:03:57
want to the angle of the range of00:03:58
value that you want available they00:04:00
will occupy 4 opted where it opted according to00:04:02
and we have a particular type which00:04:04
is the case for character which00:04:07
actually allows you to store a unicode characters a00:04:09
unicode characters because simply00:04:10
by example a letter00:04:11
the letter a in upper case the letter b00:04:13
lower case or this kind of thing you00:04:15
have if you don't know a ski table00:04:16
or quite simply the00:04:18
unicode table which allows you to find the00:04:20
famous 65536 characters available00:04:23
so that you will know which character you00:04:25
can store in a car so by00:04:27
creating a single type data because00:04:29
as we will see in the00:04:30
next video you will be able to store for00:04:32
example a single character00:04:33
there is also a type that I have not00:04:34
put here which type to manipulate00:04:36
strings of characters so words sentences00:04:38
a whole set of words that I have not00:04:40
marked here since we will see it a00:04:41
little later it joins precisely the00:04:42
object types that it does not have a00:04:44
primitive type the type for there for manage00:04:47
data in the form of strings of00:04:48
characters it simply has an00:04:49
object type which is called string we will read a00:04:51
little later here for the00:04:53
data types have roughly modo for those who00:04:55
see there that this father does not necessarily want00:04:56
if you want to see a little bit what00:04:58
manipulating function is good when you00:04:59
need to manipulate a ball a00:05:01
name something that will be either equal to00:05:02
true or false see like a kind00:05:04
of switches which off you00:05:06
will use the type there if you want to00:05:08
use a single character you00:05:09
will obviously use this type there00:05:11
increase it most of the time when00:05:13
you want to manipulate an integer00:05:14
you will use the kit agree what00:05:16
you see which is still a common offer00:05:18
we will say a fairly large value range00:05:20
it does not there is not necessarily a need except00:05:21
in very specific cases00:05:22
banking applications for example00:05:23
to use the long type and in00:05:26
which we want decimal values00:05:27
good will use the float or the doble00:05:28
depending but we can still00:05:30
easily see in which cases00:05:31
of use we will have one type or00:05:34
another so these are things to00:05:35
know things that I wanted to00:05:36
indicate you we will now00:05:39
move on to the small source files that00:05:41
I had 1st time here times surely that00:05:44
I make a man a small powershell console00:05:47
although I don't even know if I'm going to00:05:49
manipulate nouns warrants sees nothing00:05:51
displayed in fact we're not going to execute anything00:05:53
my verb doesn't matter so I'm going to00:05:55
make a small modification if I00:05:56
hadn't put it forward but we're going to00:05:57
put it now we are going to take00:05:58
good habits in reality when we have00:06:00
here a class how the facts00:06:01
previously like here class but00:06:02
unsuitable00:06:03
in fact this class has a door and an00:06:05
accessibility which public of agreement does00:06:07
not quite have part and00:06:08
to have class to the public class but within00:06:10
a few flashes equivalent so00:06:12
we will get into the habit of00:06:14
always specifying things according00:06:16
to what we want to do like here00:06:17
our public ap classification we must be00:06:19
able to access it to start our00:06:20
program we will put explicitly the00:06:23
term public here so get into the habit00:06:25
now of putting here public00:06:26
class the name of your main class00:06:28
to have our method carry out everything00:06:30
I had explained previously00:06:32
and you will understand in detail00:06:33
in the next videos so we will00:06:35
not necessarily see that right00:06:36
away00:06:37
but I simply put it in this00:06:38
source code to vote in the comments00:06:39
a few little things on quite00:06:41
simply the types of notation that you00:06:44
have a way of noting different values00:06:46
we will see later to manipulate00:06:49
data so notably numbers in00:06:50
java we have several simple notation we00:06:53
can note a very simple record number00:06:55
we increase there is for example like00:06:57
these like paul note like that we can00:06:59
also if it is a name in a few00:07:00
million we can very well noted as00:07:01
these agree will be much00:07:04
larger also00:07:05
if we want for example 100 miles we00:07:06
can very well noted like that agree00:07:08
then by default we would note like00:07:10
these the agreement without any space at the00:07:12
greenhouse only at the level of code00:07:13
we will note these numbers hard in this00:07:15
way but java offers notation00:07:18
with separators for example for00:07:20
thousands what that when you have00:07:21
for example a name which is very very00:07:22
large like here called tombola it is00:07:24
difficult to read d 'okay it's much00:07:26
more complicated to read what we don't know00:07:27
exactly how many we have two00:07:28
heroines so it's possible but you00:07:30
'll see that later so in the next00:07:31
video when we manipulate the variants00:07:33
to put a separator in the notation00:07:35
of numbers every three digits not00:07:38
all quite simply from the00:07:39
thousands you can put a little00:07:40
hand's co which is removed from the key 800:07:42
again from your life here and there where you00:07:44
see automatically we arrive very00:07:46
quickly at book the name goes close we have00:07:47
100 billion so it's much00:07:49
easier to say that if we had no00:07:51
separator here we will have a separator at00:07:53
this time in this place and the00:07:55
suburbs are like that it's simply00:07:56
14 so we don't nothing is not rivals00:07:58
thousands so here is a00:07:59
very practical notation I wanted to show you00:08:01
since we will see it very quickly and as00:08:03
I did not necessarily want to see all in00:08:04
one and the same video which would be very00:08:05
very long I preferred to separate sarron 200:08:08
so today this video on00:08:09
data types and the next one which00:08:11
will concern variables and00:08:12
constants in the southern harbor you00:08:14
also have different bases that if you00:08:15
don't know but I think you00:08:17
doubt it a little bit and cana that00:08:18
know the numerical bases the00:08:20
corsair konyves to count you have00:08:21
bases count there is one that you00:08:24
know well which is the base00:08:25
decimals agree the base if badly past00:08:27
the base 10 so it is the number which goes00:08:29
from 0 to 900:08:30
I think you know a this is what00:08:32
I use in mathematics in you00:08:33
count for anything we in the00:08:36
binary base this is the language of the00:08:37
machine a computer it only understands00:08:39
this base pabbi don't have I don't know what00:08:41
binary which is a base called base 200:08:44
and the base 2 is 0-100:08:48
and that these two Jews possible we will00:08:49
have the octal base which edits base eight00:08:52
bases 8c from 0 to 700:08:55
and we will finally have the hexadecimal base00:08:59
which is a base 16 that it goes 2 0 ap00:09:04
here is roughly how to illustrate each00:09:08
of the bases of merit in any case this time00:09:10
of a rail can be a base for00:09:11
each thing we can have a base 300:09:12
a base became a base 46 we could00:09:15
find one and invent a base for00:09:16
anything it also examines00:09:17
other specific bases in certain00:09:19
fields of application in maths in00:09:21
arts etc but here these are the standard bases and00:09:24
these bases the languages programming00:09:26
and java in this case for for this00:09:28
video has provided special notations00:09:30
for these types so when you00:09:32
manipulate the base of the six master the base00:09:33
that you use every day without00:09:35
realizing it00:09:36
we will write things like this without00:09:37
problem of agreement we send absolutely00:09:39
nothing in particular we the name to00:09:40
end we are not even obliged00:09:42
to use separators we can very00:09:43
well all noted like that all the00:09:44
numbers collar side by side but if at a00:09:46
given moment you have need to note00:09:47
let's admit a binary value00:09:49
okay it will be necessary to precede it with the00:09:52
prefix 0 but okay this prefix in00:09:55
computing will simply indicate00:09:56
that everything that comes after and a00:09:58
binary value and then I can00:10:00
note a binary value for example at00:10:02
1001 that's that kind of thing00:10:04
okay while if you00:10:06
actually just note that for it it will be an00:10:10
integer okay that is to say it will00:10:12
actually separate like those here it will be 1100:10:15
million and 1111 okay so it's not00:10:19
at all the same thing as where we have 1 100:10:20
0 0 1 1 which is a binary number in this00:10:23
place so if you want to manipulate00:10:25
a binary number you will add the00:10:26
prefix 0 b in front but we will handle it00:10:28
anyway in the next video we00:10:30
will come back to Sarah pleading for a hospital00:10:32
and simply put 1 0 and for00:10:34
example three numbers which will designate00:10:36
a value October00:10:37
so I lose my 7 5 5 for example if I00:10:38
am was I going to have a perty system of00:10:40
permissions sorry on a file on the00:10:42
gnu/linux system00:10:43
let's admit this kind of thing we would00:10:45
therefore note it in this way 0 and 7 500:10:48
if I just put that it becomes a00:10:49
decimal place 755 million wants 7 5 5 in00:10:51
October so we put this small fixed price00:10:53
of 0 at the start is automatically00:10:55
I swallow will recognize committing a number00:10:58
in base in total00:10:59
and if we want to work in hexadecimal00:11:01
we just have to put zero x and the tuque00:11:04
where we can work like that without any00:11:06
problem zero00:11:19
if one00:11:21
day you want to store a00:11:22
hexadecimal value in a hymn any other00:11:24
okay depending on you will be able to manage00:11:26
that without problem okay there is00:11:27
really no problem of00:11:28
course and particular types like00:11:30
the quarter for the ball 1 which are and00:11:32
which manipulates other things and the00:11:33
string which I have not noted here but00:11:34
which we will talk about much later and your00:11:36
veil we will have the opportunity to see it in00:11:37
a video for the character strings00:11:39
is a particular type00:11:41
also we see there the things that I00:11:42
wanted to show you this video which00:11:43
seemed important to me for everything that00:11:45
we are going to see I prefer that we see00:11:46
things from the start here to know00:11:48
what you can manipulate and00:11:49
after that way you will have a lot00:11:50
fewer questions later when00:11:52
you use all these types of00:11:53
data and all these digital chord notations00:11:55
in your programs and00:11:57
maybe you will need it for a00:11:58
certain personal professional project00:11:59
I don't know what or at school if you if00:12:02
you study java at university or00:12:03
high school where I don't know what so you will have00:12:05
the opportunity to use it in this00:12:06
way so that being said I00:12:08
showed you the types of angry chords00:12:10
rise quickly here it is forever like Thursday00:12:12
note them on your side or take a00:12:13
screenshot at this moment of the video00:12:15
if you want there is no problem you00:12:16
do not have to learn everything by00:12:17
heart I will tell you say this is his way that00:12:19
you will very quickly have to remember00:12:21
since in other programming languages00:12:22
like c2c since more00:12:24
we find roughly all the00:12:26
same types apart from the lease which is a00:12:27
quarter in c c++ is a little different but00:12:30
otherwise all the types exist00:12:31
practically the ball before it depends00:12:32
on the languages but we find them all00:12:34
otherwise blue ints and it's quite00:12:36
quite widespread everywhere00:12:38
long blue shorts etc we find them almost everywhere so that00:12:40
's some types of data in java to00:12:42
know you have the type obliges00:12:43
to associate my will come back to it do00:12:45
not worry the place that it occupies in00:12:47
memory in byte the agreement and the00:12:49
minimum and maximum values that you can00:12:51
store in this type also I remind you00:12:53
if you want stored for example the00:12:54
number of millions four hundred and fifty00:12:55
thousand did not use a short type you00:12:57
see that there high level of the00:12:58
value range it does not pass it00:13:00
is outside the value range00:13:01
so you will have to use this instead type00:13:03
there which is the smallest00:13:05
possible used the one which takes the least00:13:07
memory space to store the number00:13:09
of millions and some agreements we00:13:10
always thought of that00:13:11
always keep that in mind that obviously00:13:12
not learn the value ranges by heart00:13:14
that is useful strictly for nothing00:13:15
afterwards does not change either from one00:13:17
language to another since balit it00:13:18
darkens in relation to the addressing in00:13:19
memory and as the RAM is the00:13:21
same in agreement and addressed in the same way00:13:23
in general the language of programming00:13:24
use the same range of values00:13:26
which is perfectly logical00:13:27
since an option will always remain one00:13:29
byte whatever the computer00:13:30
so the address spaces are managed00:13:32
in the same way so there is no need to00:13:34
learn it by heart I have to do00:13:35
with the idea of agreements to make you00:13:36
half of the two00:13:38
approximate values and you will know very00:13:40
quickly and very easily how to use00:13:41
the right type of data depending on00:13:43
so that's the first thing see the00:13:45
types of data in java then know00:13:47
that there are four standard bases if00:13:49
you don't know them if you have00:13:50
never studied it at school or others in a00:13:52
personal way now you00:13:54
have learned it you know them very00:13:55
simply after I leave and I have makes00:13:57
videos on training with king where00:13:59
I talk to you in detail about the different00:14:00
bases and how to convert00:14:02
from one to the other so if it's really something that00:14:04
interests you go see my course with00:14:06
king on the first videos we are talking about00:14:08
the different bases of the00:14:09
town hall since there it is of interest after00:14:11
you have a notation00:14:12
Thursday the separator tick here for the00:14:13
thousands and the famous notation00:14:15
according to the base that you will want to00:14:17
manipulate hexadecimal octal and billère00:14:19
here it is is all I wanted00:14:20
to show you in any case for this video there is00:14:22
not much to see at a00:14:23
higher level in any case00:14:24
possible notations now as we had spoken00:14:27
precisely two here about unicode agreement character00:14:29
you will see that there are00:14:30
special characters to handle00:14:32
also in programming languages00:14:33
and big advantage if you00:14:35
see them in java etc it is the first00:14:37
language that you learn years for the00:14:38
nation they are the same for these00:14:40
for c++ and for a whole bunch of other00:14:41
languages for C# etc.00:14:43
we find the same00:14:45
special characters since all the languages00:14:46
have agreed to use these00:14:48
special characters and have been worth noting00:14:50
to end this video are very00:14:52
healthy you have slash lenses00:14:53
attention it's an anti slapp okay00:14:55
so it's the alt gr key and the00:14:57
8 key on your keyboard to do it and 1n00:14:59
that there will be a new okay new00:15:02
line so new line it's a return00:15:04
to the line you have the antys cowardice00:15:06
which is a tabulation okay you00:15:09
have slash lenses here00:15:11
anti its expensive for the carriage return00:15:13
so it's up to you to test to make the00:15:15
difference in particular with the00:15:17
backspace track tray sorry which is a backspace00:15:19
so if you don't see the difference00:15:21
between the two there, testing them at the00:15:22
code level will very quickly see for the00:15:24
for a few here at an execution00:15:26
so I will have to00:15:28
execute our program to see00:15:29
that it is for that's what I wanted to open00:15:30
a verschelle pot to show that and we00:15:33
also have others other00:15:34
specific ones for example antilles00:15:36
ends for a new page not00:15:37
for that it can be quite useful also00:15:39
to simulate entremont for example00:15:41
the deleting the console here can00:15:43
be quite practical and we have00:15:45
specific ones, for example, at a00:15:46
given moment you noted this character and00:15:48
you don't want them to be taken into00:15:49
account here in the chain as we had00:15:50
seen the last time with the single rib00:15:52
well you can protect it with an00:15:55
anti slash we can do the same thing for the anti00:15:57
slash and the double rib and quite a few00:15:59
other things too00:16:00
we have other specific cases also00:16:02
on your note by example an00:16:03
octal number can also be noted this way for00:16:06
example00:16:07
so this is also a way of doing it00:16:08
if we want to note this notation00:16:10
if we want to note a number was00:16:12
hexadecimal we can also note it very well00:16:14
like these okay for example in00:16:17
weaving00:16:27
a priori no need00:16:29
and if one day it is the cabba you will00:16:30
look in the java documentation00:16:31
depending on if you need00:16:33
to use these special characters in00:16:35
any case know that they exist and00:16:37
above all that which are very useful in00:16:38
terms of the display00:16:39
so I said that print and this00:16:41
method of the out object which is in the00:16:44
system class so all these things00:16:46
if you don't understand we will see them00:16:47
explained soon don't worry00:16:49
you can00:16:50
obviously use special characters these00:16:53
special characters must be put00:16:54
in the text to say inside the00:16:56
double odds here very important so do00:16:58
n't put for example German 6 the00:17:00
string here not okay you put it00:17:02
inside if I execute the program00:17:05
as it is there we are going to look a little00:17:06
bit this will end the video we do not00:17:08
need to show you other things00:17:10
here we do java c00:17:14
to see ok so it will create a pseudo00:17:20
conflict and therefore we will have close compiled it00:17:22
into bytecode the program I recall the00:17:24
source file and from there everything that has been pre-00:17:27
compiled in a file point class00:17:28
we will be able to have it executed00:17:30
by the virtual machine with the simple00:17:32
how to java and there we can just at00:17:34
pessah and here the virtual machine00:17:36
starts and executes the program so there00:17:38
you see there was simply a single00:17:39
return to the line of agreement which was00:17:41
done automatically thanks to this00:17:42
method if ever I am going to add another00:17:43
game can very well put here and there we00:17:46
start again we ready compile and we execute00:17:50
and see that there is indeed a small a00:17:51
new return to linky has been put if you00:17:53
want a tabulation one thing for00:17:57
example here we put an anti this buy00:17:59
so in the place we will send the00:18:00
character is placed at the place where you00:18:02
want to make the00:18:03
special character so the new line at00:18:05
tabulation etc and that's where it will happen so the00:18:08
tabulation will be done before their sentence00:18:09
here we had a tabulation which is00:18:11
done etc etc00:18:13
so don't hesitate if you want to00:18:14
do a very simple little exercise00:18:16
for this start of training and00:18:17
do a lot of small00:18:19
character strings to make several00:18:20
instructions like that and to use the00:18:22
different special characters that you00:18:24
have there to see a little bit how00:18:25
they behave and how you can00:18:26
present as it is worth00:18:28
console display with these that's00:18:30
all I'm going to show you00:18:31
the important way is to know00:18:34
these types of data well since we will00:18:35
manipulate them soon we will00:18:36
use variables for this to00:18:38
obviously be able to store data00:18:39
because if we have nothing to store00:18:41
data we will not be able to do00:18:42
much in terms of our programs so00:18:43
you will see one of the first00:18:44
very important notions in programming00:18:46
if java here rescue is the first00:18:49
that you follow in computer science and we00:18:51
learn to manipulate all that a little bit00:18:52
with our different types of data00:18:54
the different notation of we have seen00:18:56
and we will also see how to display00:18:57
one and how to work with these00:18:59
variants I'll see you soon for the00:19:01
next video I hope you liked it00:19:02
and if you have any questions have any00:19:04
problems don't hesitate to let me00:19:05
know in the comments00:19:07
ciao everyone00:19:10
[Music]00:19:28
[Applause]00:19:29
[Music ]Description:
Petite vidéo sur les types de données que vous allez pouvoir manipuler en Java, et quelques notations possibles pour les nombres et caractères spéciaux. ➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖ 💙 Si ce n'est pas encore fait, n'hésite pas à t'abonner à la chaîne ➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖ ◾ Soutenir FormationVidéo : https://www.youtube.com/channel/UCS2e0hEJMhwd6bNscS60xTg/join ◾ Site web : https://jasonchampagne.fr/ ◾ Discord : https://discord.me/jasonchampagne ◾ Twitch : https://www.twitch.tv/jachampagne ◾ YouTube (personnel) : https://www.youtube.com/jasonchampagne ◾ Twitter : https://twitter.com/jachampagne8 ◾ Facebook : https://www.facebook.com/unsupportedbrowser ◾ Instagram : https://www.facebook.com/unsupportedbrowser ◾ Snapchat : https://www.snapchat.com/add/jachampagne8 🔵 Crédits : Musique proposée par La Musique Libre Wontolla - Can You Feel Me (ft. Nathan Brumley) : https://www.youtube.com/watch?v=quPybcMGosk Wontolla : https://soundcloud.com/iamwontolla Nathan Brumley : https://soundcloud.com/nathanbrumleysongwriter MERCI DE VOTRE FIDÉLITÉ 💙 !
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