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Flutter 7 - Intro to Classes Video Lecture | Flutter: Build beautiful native apps in record time - App Development
FAQs on Flutter 7 - Intro to Classes Video Lecture - Flutter: Build beautiful native apps in record time - App Development
| 1. What is Flutter? |  |
Ans. Flutter is an open-source UI software development kit created by Google. It is used to develop cross-platform applications for mobile, web, and desktop platforms using a single codebase.
| 2. What is a class in Flutter? | |
Ans. In Flutter, a class is a blueprint or a template for creating objects. It defines the properties (variables) and behaviors (methods) that an object can have. Classes are used to create reusable components in Flutter app development.
| 3. How do you create a class in Flutter? | |
Ans. To create a class in Flutter, you need to define it using the "class" keyword followed by the class name. Inside the class, you can define variables, methods, and constructors. Here's an example of creating a class named "Person":
class Person {
String name;
int age;
Person(this.name, this.age);
void sayHello() {
print("Hello, my name is $name and I am $age years old.");
}
}
| 4. What is the purpose of constructors in Flutter classes? | |
Ans. Constructors in Flutter classes are special methods that are used to initialize the properties (variables) of an object when it is created. They provide a convenient way to set the initial values of variables. In the example above, the constructor "Person(this.name, this.age)" initializes the "name" and "age" variables when a new "Person" object is created.
| 5. How can classes be used to create reusable components in Flutter? | |
Ans. Classes in Flutter can be used to create reusable components by encapsulating related properties and behaviors into a single entity. By creating a class for a specific component, such as a button or a card, you can easily create multiple instances of that component with different properties. This promotes code reusability and makes it easier to maintain and update the app.
Text Transcript from Video
everybody this is Brian and welcome to
the seventh dart tutorial alright so
today we're gonna click language and
then go back to tour and what we're
going to start today is called classes
you may be sitting in a class watching
this video but this is different so
first off what is a class if you never
come from any other language it'll say
dart is an object-oriented language with
classes and mix and based inheritance
what in the heck does that mean what it
really means is a class is a blue print
from that blue plant that blue print you
create an instance of that object so
let's say you have a house well a house
is a abstract concept right there's
different types of houses that come in
all sizes shapes colors rooms locations
so a house would be your blueprint from
that you would instigate or make
instances of houses so you would
actually build the houses from those
blueprints that's kind of what we're
gonna be doing today
all right so we're gonna create a new
project here I'm gonna make sure its
console application at dart and let's
call this classes one even though it's
really like intro to classes so while
that is just grinding away calculating
the trajectory of everything of the
universe
what is the mixin based inheritance mean
you'll see this passed around quite a
bit really what that means is you can
have multiple classes and have those
classes inherit from each other for
example you are inherited from your
mother and your father so let's say your
mother has red hair and your father has
blue eyes you probably have red hair and
blue eyes actually I think most redheads
have blue eyes anyways I am when I had
here I was a redhead but anyways so
let's just dive right in here so first
thing I want to cover is why do we need
classes to begin with we can already put
functions in here so let's just say we
want to do void print speak whoops
that was just stupid and what to speak
and then in here we're going to print
something right and we can call this
pretty much from wherever we want right
we've done this before and we're gonna
say so when we run this we know
absolutely what to expect it's speaking
but let's say we want to mimic a dog or
a cat hmm then we've got to change this
so let's say string I don't know what to
call this noise and then we're gonna add
the noise here and oops oh yeah we
forgot to add this so now we want to say
we're gonna just imitate a cat here yeah
why not and that's gonna be out but what
if we want to do a dog now well okay I
guess we could just do this and then
bark instead but we are now imitating a
dog in a cat but we don't actually have
a dog in a cat what if we want to add
things like fur color eye color you know
name things like that that's where class
is really shine so first thing we're
gonna do is make a new dart file let's
just call it cat that dirt and notice
how I put it in the bin file if you read
the official documentation the Lib is
actually really for external or public
things so if you want to share that with
the rest of the world where bin is
really for your internal program I may
be wrong on that but that's what I read
and whoops we don't save void we say
class because we're giving an actual
type now this is not a return type this
is a declaration notice how it doesn't
take any parenthesis it just has these
brackets so there's no parameters here
we will get into that
they're called constructors we'll get
into that into a future tutorial but
right now we're going to keep it simple
here so now we're gonna say void speak
print you know and we're going to just
through the magic copy and paste make a
new file call this dog and
go back to our main file here let's just
get rid of these first thing we really
need to do is actually import those so
we're going to import and we're going to
import cat dart and we're going to
import dog that dirt I thought my phone
made a weird noise I just heard that
anyways
I dropped my phone and it like a camera
case crack the phone itself is fine but
I had to order a special apartment now
the phone's act and just weird alright
so now that we have our classes our
blueprints we have to actually make
instances of those objects so we're
gonna say cat and I don't know what to
call the cat let's call him mr. twinkles
I have no idea what to name the cat you
call new cat so what are we doing here
we've seen something similar so we're
declaring a type which is actually our
class our blueprint this guy right here
and then we're saying our variable name
and then we're going to actually assign
it a value and we're saying new new as a
keyword new cat meaning we're going to
take that cat blueprint make a brand new
version of that and hand it to this
variable we could also do this so now we
have two instances of the same blueprint
but they're two different objects we
have an object here and an object here
and we can say now we have an instance
of our dog class then we could say mr.
twinkles speak fluffy speak and I'll say
what we call him Fido speak
I prefer to do lowercase but we should
because their names I'm kind of weird
about that sometimes so when we run this
bad boy you'll see we have meow meow
barks we've got both cats meowing and
dog barking here so we got a noisy room
okay great but what are we really
leveraging here what's the real power of
classes what we can do here is say like
bool Clause out and with the dog we can
say string color
so what we down now is our blueprints
are different right both of them have a
speak but dog has a color cat has a
claws-out and we can access those
through the properties so let's say Fido
oops not final Fido
there we go and let's just print this
bad boy my spelling skills are much to
be desired today there we go
so you can see we now have brown after
bark because we're printing out photos
color so that is in a nutshell how you
would build a class and how you would
actually make your blueprint now there's
a lot that goes into this we're gonna
split this up over several videos and
what I want to do now is actually make a
bit more of a complex example and to do
that we're going to kind of abandon the
dog cat example we're gonna make a new
file and we're gonna call it let's call
it house and in here we're going to say
class house and we're gonna make our
scope now we're going to make a private
variable here we're gonna say mm H and
then we're going to make a public
variable
and then we're just gonna make a couple
properties that are public here we're
gonna say int with it height ah that was
my phone I did hear it go away phone I'm
doing a tutorial and then what is the
difference between private and public
some of you know other languages
understand this but some of you that are
new may not notice how it has this
underscore in the beginning of it that
is how you differentiate between private
and public private means that only this
class inside of the scope can access
this variable public means anything in
the class and outside of it can access
it so a good example let's just import
here just gonna say House 1 equal new
house so if we try to say House 1 dot
and we do that underscore age equal 99
years old you notice how it is not
liking that it's going to say the setter
age is undefined in class house what
does that mean the Center age that makes
literally no sense what's going on here
so let's try house 1 dot width equal
we'll say this is 100 feet and house 1
that height actually should call that
length but actually let's change that
because I want this to actually make
sense
and let's say this is 200 feet long it's
kind of a big house those take it just
fine so what is this complaining about
let's just try to run it and of course
boom same air class house has no
instance center underscore age it's
doing that because we have a scope issue
this is a private variable and we're
trying to access it outside of the class
now if we're in the class itself and
let's just say notice how it suddenly
works that is called scope within the
class you cannot access that outside of
this class or the scope whenever you see
these brackets think of scope because it
is private private is denoted by that
underscore that is specific to this
language to definitely pay attention to
that in most other languages you
actually write the word public or
private in front of the type dart goes
away from that whole concept but fear
not there is an easy way to set that and
we're going to show that right now what
we're gonna do is a getter and setter so
we're gonna say you remember the error
message that popped out with is there is
no setter what's a setter well this is a
concept that sprung up about I want to
say 20-some odd years ago and we're just
going to go over it real quick so when
we get something you're taking something
right you're saying give it to me so
we're going to get I want to say footage
and then we're gonna do fat arrow width
times length what have we done here
we're getting a getter we're getting a
getter we're creating a getter using the
get keyword that is an integer type the
variable is called footage the fat air
really basically says we're making an
anonymous function here because it's all
one line we don't have to break this
into like something like this and
footage returned with times length yeah
you don't have to do something like that
so we're just going to delete that
because it's all one line right it's all
compact you can definitely do it the
other way but that's well this fat error
really does it just condenses it to 1/9
so we're getting that and we have this
anonymous function here or is it inline
function autonomous versus inline that
always messes me up so let's get our
square footage from this thing it's
actually delete that so it'll run and
we're going to say print house one
footage so when we run this you can see
this is a large house let's scale that
down that's like you know massive house
let's just say this is a length of 50
feet actually 25 feet by 60-foot house
okay that's more reasonable that's about
a normal house size here so how is it
calculating how's it getting this
footage well back to our our blueprint
here we got our getter and the getter is
saying hey whenever you try to access
this variable run this code and all
that's doing is taking our variables
width and length and multiplying them
and then returning them pretty simple
but what if we want to actually set
something we want to set the age of the
house up here so let's do that now we
have another problem is we can't access
that because it's a private variable
that's what getters and setters work in
tandem so we're going to say int get
mm-hmm and let's just call this home age
that way now let's call this years that
way there's no real real issue between
underscore age and age and we're going
to say
returned age and then we're going to set
home error I'm sorry
years old now you want to give it a type
there so what we're really doing is
we're saying okay when you try to get
something out of this when you're trying
to access that return this which is
actually up here this private variable
however when you're trying to set it or
save something to think of a variable as
a container like a little bucket
remember a variable is something that
will change the contents of that bucket
will change so when we go to pull
something out of that bucket we're
calling get when we go to put something
into the bucket we're calling set think
of it in terms of those concepts and to
make much more sense now set and get you
have to have a type here so we want to
get we want to pull out of that bucket
an integer and set we want to put into
that bucket an integer and that's how
we're actually doing that so when we go
to pull out of the bucket this will get
run when we go to put into the bucket
this will get run that's a very
confusing concept if you're new to
programming that's why I kind of really
wanted to cover it so we're gonna say
house one that's years old
equal say it's a ten-year-old house and
then we're going to print house 1 dot
years old let's run this and you can see
there's our ten so here we are calling
the setter here we're calling the getter
getters and setters are important
because sometimes you don't want to
actually expose your variable to the
outside world or you want to control how
its accessed for example let's say you
want to set this but you know you're
running a real estate agency and older
houses really are more attractive so you
want to add ten years to that house
so what we're doing here is a little
sneaky right because we're saying house
one years old is ten but under the hood
in the background we're actually adding
ten years so it's now twenty years old
so always think of getters and setters
as if you're working with a bucket it'll
be much easier in your head and that's
why you need to use them so you can
actually isolate that variable from the
outside world so that's great null what
happens if we have multiple homes here
so let's just make a new house let's
make a couple of them
and let's add a property in here call oh
we've already got it color and we're
gonna go back here and we're gonna say I
want a red house house to dot color on a
blue house then house three mmm I need a
good color I need like a solid color
that's just gonna stand out whack you
don't see any black houses I don't know
why Black's pretty cool color that could
be really trendy to have like a
completely black house I'd buy one so
back to our trusty list example with
generics program remember how we have
worked with I think strings and integers
in the past see how this is list and
then the little arrows and then e that
is the template we're going to be
working with and we are going to say we
want to use our house class notice how
maybe it's not visible it's got that
little C right here
it wasn't too visible when I'm on it but
it's got that seed that denotes it's a
class so we're gonna use the class not
an actual variable we're going to call
this homes whole new list house now that
statement that we've worked in the past
makes a little more sense because we
know now that list is actually under the
hood a class and this just means it's
using generic programming which we will
use in future tutorials now we're just
going to say homes dot for each and in
here we're going to say whoopsie I
always come on keyboard work with me
here there we go we are just going to do
our function I want to say value and
we're going to say print even how you
dot color
so really what we're doing here is we're
saying make a list and in that list
we're gonna store homes or the house
class that blueprint and for each of
them we're going to print out the color
and you can see how it is now where'd it
go why did it not do that there's brown
print value dot color did I screwed that
up you know it's been a very long day
when you just completely forget to do
something there's nothing in our list
that's why it wasn't working my brain is
totally fried I have bought in the house
I am currently doing a lot of stuff at
work so bear with me if I'm a little
scatterbrained sometimes homeownership
will definitely make you lose your mind
I spent all weekend installing these
lights it should have been the easiest
thing in the world after about a million
cuss words the lights are installed
working though there we go so there's
our three houses with the three
different colors and in there you can
access the other properties and things
to like you know footage things like
that alright so that is in a nutshell
intro to classes I hope you found this
educational and entertaining we're gonna
cover these a little more in depth be
sure to really read up on classes on the
official dart site and for the source
code go out to my website void roms com
click tutorials and there's a link to my
github repos I do have it out here as
flutter' tutorials and then I have them
as sub modules in here and I'll put in
the additional sub modules if you're so
inclined if this helped you definitely
consider donating this sites run 100
percent off your donations and I thank
you for watching
the seventh dart tutorial alright so
today we're gonna click language and
then go back to tour and what we're
going to start today is called classes
you may be sitting in a class watching
this video but this is different so
first off what is a class if you never
come from any other language it'll say
dart is an object-oriented language with
classes and mix and based inheritance
what in the heck does that mean what it
really means is a class is a blue print
from that blue plant that blue print you
create an instance of that object so
let's say you have a house well a house
is a abstract concept right there's
different types of houses that come in
all sizes shapes colors rooms locations
so a house would be your blueprint from
that you would instigate or make
instances of houses so you would
actually build the houses from those
blueprints that's kind of what we're
gonna be doing today
all right so we're gonna create a new
project here I'm gonna make sure its
console application at dart and let's
call this classes one even though it's
really like intro to classes so while
that is just grinding away calculating
the trajectory of everything of the
universe
what is the mixin based inheritance mean
you'll see this passed around quite a
bit really what that means is you can
have multiple classes and have those
classes inherit from each other for
example you are inherited from your
mother and your father so let's say your
mother has red hair and your father has
blue eyes you probably have red hair and
blue eyes actually I think most redheads
have blue eyes anyways I am when I had
here I was a redhead but anyways so
let's just dive right in here so first
thing I want to cover is why do we need
classes to begin with we can already put
functions in here so let's just say we
want to do void print speak whoops
that was just stupid and what to speak
and then in here we're going to print
something right and we can call this
pretty much from wherever we want right
we've done this before and we're gonna
say so when we run this we know
absolutely what to expect it's speaking
but let's say we want to mimic a dog or
a cat hmm then we've got to change this
so let's say string I don't know what to
call this noise and then we're gonna add
the noise here and oops oh yeah we
forgot to add this so now we want to say
we're gonna just imitate a cat here yeah
why not and that's gonna be out but what
if we want to do a dog now well okay I
guess we could just do this and then
bark instead but we are now imitating a
dog in a cat but we don't actually have
a dog in a cat what if we want to add
things like fur color eye color you know
name things like that that's where class
is really shine so first thing we're
gonna do is make a new dart file let's
just call it cat that dirt and notice
how I put it in the bin file if you read
the official documentation the Lib is
actually really for external or public
things so if you want to share that with
the rest of the world where bin is
really for your internal program I may
be wrong on that but that's what I read
and whoops we don't save void we say
class because we're giving an actual
type now this is not a return type this
is a declaration notice how it doesn't
take any parenthesis it just has these
brackets so there's no parameters here
we will get into that
they're called constructors we'll get
into that into a future tutorial but
right now we're going to keep it simple
here so now we're gonna say void speak
print you know and we're going to just
through the magic copy and paste make a
new file call this dog and
go back to our main file here let's just
get rid of these first thing we really
need to do is actually import those so
we're going to import and we're going to
import cat dart and we're going to
import dog that dirt I thought my phone
made a weird noise I just heard that
anyways
I dropped my phone and it like a camera
case crack the phone itself is fine but
I had to order a special apartment now
the phone's act and just weird alright
so now that we have our classes our
blueprints we have to actually make
instances of those objects so we're
gonna say cat and I don't know what to
call the cat let's call him mr. twinkles
I have no idea what to name the cat you
call new cat so what are we doing here
we've seen something similar so we're
declaring a type which is actually our
class our blueprint this guy right here
and then we're saying our variable name
and then we're going to actually assign
it a value and we're saying new new as a
keyword new cat meaning we're going to
take that cat blueprint make a brand new
version of that and hand it to this
variable we could also do this so now we
have two instances of the same blueprint
but they're two different objects we
have an object here and an object here
and we can say now we have an instance
of our dog class then we could say mr.
twinkles speak fluffy speak and I'll say
what we call him Fido speak
I prefer to do lowercase but we should
because their names I'm kind of weird
about that sometimes so when we run this
bad boy you'll see we have meow meow
barks we've got both cats meowing and
dog barking here so we got a noisy room
okay great but what are we really
leveraging here what's the real power of
classes what we can do here is say like
bool Clause out and with the dog we can
say string color
so what we down now is our blueprints
are different right both of them have a
speak but dog has a color cat has a
claws-out and we can access those
through the properties so let's say Fido
oops not final Fido
there we go and let's just print this
bad boy my spelling skills are much to
be desired today there we go
so you can see we now have brown after
bark because we're printing out photos
color so that is in a nutshell how you
would build a class and how you would
actually make your blueprint now there's
a lot that goes into this we're gonna
split this up over several videos and
what I want to do now is actually make a
bit more of a complex example and to do
that we're going to kind of abandon the
dog cat example we're gonna make a new
file and we're gonna call it let's call
it house and in here we're going to say
class house and we're gonna make our
scope now we're going to make a private
variable here we're gonna say mm H and
then we're going to make a public
variable
and then we're just gonna make a couple
properties that are public here we're
gonna say int with it height ah that was
my phone I did hear it go away phone I'm
doing a tutorial and then what is the
difference between private and public
some of you know other languages
understand this but some of you that are
new may not notice how it has this
underscore in the beginning of it that
is how you differentiate between private
and public private means that only this
class inside of the scope can access
this variable public means anything in
the class and outside of it can access
it so a good example let's just import
here just gonna say House 1 equal new
house so if we try to say House 1 dot
and we do that underscore age equal 99
years old you notice how it is not
liking that it's going to say the setter
age is undefined in class house what
does that mean the Center age that makes
literally no sense what's going on here
so let's try house 1 dot width equal
we'll say this is 100 feet and house 1
that height actually should call that
length but actually let's change that
because I want this to actually make
sense
and let's say this is 200 feet long it's
kind of a big house those take it just
fine so what is this complaining about
let's just try to run it and of course
boom same air class house has no
instance center underscore age it's
doing that because we have a scope issue
this is a private variable and we're
trying to access it outside of the class
now if we're in the class itself and
let's just say notice how it suddenly
works that is called scope within the
class you cannot access that outside of
this class or the scope whenever you see
these brackets think of scope because it
is private private is denoted by that
underscore that is specific to this
language to definitely pay attention to
that in most other languages you
actually write the word public or
private in front of the type dart goes
away from that whole concept but fear
not there is an easy way to set that and
we're going to show that right now what
we're gonna do is a getter and setter so
we're gonna say you remember the error
message that popped out with is there is
no setter what's a setter well this is a
concept that sprung up about I want to
say 20-some odd years ago and we're just
going to go over it real quick so when
we get something you're taking something
right you're saying give it to me so
we're going to get I want to say footage
and then we're gonna do fat arrow width
times length what have we done here
we're getting a getter we're getting a
getter we're creating a getter using the
get keyword that is an integer type the
variable is called footage the fat air
really basically says we're making an
anonymous function here because it's all
one line we don't have to break this
into like something like this and
footage returned with times length yeah
you don't have to do something like that
so we're just going to delete that
because it's all one line right it's all
compact you can definitely do it the
other way but that's well this fat error
really does it just condenses it to 1/9
so we're getting that and we have this
anonymous function here or is it inline
function autonomous versus inline that
always messes me up so let's get our
square footage from this thing it's
actually delete that so it'll run and
we're going to say print house one
footage so when we run this you can see
this is a large house let's scale that
down that's like you know massive house
let's just say this is a length of 50
feet actually 25 feet by 60-foot house
okay that's more reasonable that's about
a normal house size here so how is it
calculating how's it getting this
footage well back to our our blueprint
here we got our getter and the getter is
saying hey whenever you try to access
this variable run this code and all
that's doing is taking our variables
width and length and multiplying them
and then returning them pretty simple
but what if we want to actually set
something we want to set the age of the
house up here so let's do that now we
have another problem is we can't access
that because it's a private variable
that's what getters and setters work in
tandem so we're going to say int get
mm-hmm and let's just call this home age
that way now let's call this years that
way there's no real real issue between
underscore age and age and we're going
to say
returned age and then we're going to set
home error I'm sorry
years old now you want to give it a type
there so what we're really doing is
we're saying okay when you try to get
something out of this when you're trying
to access that return this which is
actually up here this private variable
however when you're trying to set it or
save something to think of a variable as
a container like a little bucket
remember a variable is something that
will change the contents of that bucket
will change so when we go to pull
something out of that bucket we're
calling get when we go to put something
into the bucket we're calling set think
of it in terms of those concepts and to
make much more sense now set and get you
have to have a type here so we want to
get we want to pull out of that bucket
an integer and set we want to put into
that bucket an integer and that's how
we're actually doing that so when we go
to pull out of the bucket this will get
run when we go to put into the bucket
this will get run that's a very
confusing concept if you're new to
programming that's why I kind of really
wanted to cover it so we're gonna say
house one that's years old
equal say it's a ten-year-old house and
then we're going to print house 1 dot
years old let's run this and you can see
there's our ten so here we are calling
the setter here we're calling the getter
getters and setters are important
because sometimes you don't want to
actually expose your variable to the
outside world or you want to control how
its accessed for example let's say you
want to set this but you know you're
running a real estate agency and older
houses really are more attractive so you
want to add ten years to that house
so what we're doing here is a little
sneaky right because we're saying house
one years old is ten but under the hood
in the background we're actually adding
ten years so it's now twenty years old
so always think of getters and setters
as if you're working with a bucket it'll
be much easier in your head and that's
why you need to use them so you can
actually isolate that variable from the
outside world so that's great null what
happens if we have multiple homes here
so let's just make a new house let's
make a couple of them
and let's add a property in here call oh
we've already got it color and we're
gonna go back here and we're gonna say I
want a red house house to dot color on a
blue house then house three mmm I need a
good color I need like a solid color
that's just gonna stand out whack you
don't see any black houses I don't know
why Black's pretty cool color that could
be really trendy to have like a
completely black house I'd buy one so
back to our trusty list example with
generics program remember how we have
worked with I think strings and integers
in the past see how this is list and
then the little arrows and then e that
is the template we're going to be
working with and we are going to say we
want to use our house class notice how
maybe it's not visible it's got that
little C right here
it wasn't too visible when I'm on it but
it's got that seed that denotes it's a
class so we're gonna use the class not
an actual variable we're going to call
this homes whole new list house now that
statement that we've worked in the past
makes a little more sense because we
know now that list is actually under the
hood a class and this just means it's
using generic programming which we will
use in future tutorials now we're just
going to say homes dot for each and in
here we're going to say whoopsie I
always come on keyboard work with me
here there we go we are just going to do
our function I want to say value and
we're going to say print even how you
dot color
so really what we're doing here is we're
saying make a list and in that list
we're gonna store homes or the house
class that blueprint and for each of
them we're going to print out the color
and you can see how it is now where'd it
go why did it not do that there's brown
print value dot color did I screwed that
up you know it's been a very long day
when you just completely forget to do
something there's nothing in our list
that's why it wasn't working my brain is
totally fried I have bought in the house
I am currently doing a lot of stuff at
work so bear with me if I'm a little
scatterbrained sometimes homeownership
will definitely make you lose your mind
I spent all weekend installing these
lights it should have been the easiest
thing in the world after about a million
cuss words the lights are installed
working though there we go so there's
our three houses with the three
different colors and in there you can
access the other properties and things
to like you know footage things like
that alright so that is in a nutshell
intro to classes I hope you found this
educational and entertaining we're gonna
cover these a little more in depth be
sure to really read up on classes on the
official dart site and for the source
code go out to my website void roms com
click tutorials and there's a link to my
github repos I do have it out here as
flutter' tutorials and then I have them
as sub modules in here and I'll put in
the additional sub modules if you're so
inclined if this helped you definitely
consider donating this sites run 100
percent off your donations and I thank
you for watching
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