Constructors - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
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Now that you know how to implement methods, let's move on to constructors. You
now that you know how to implement methods let's move on to constructors
want to be able to create variations of objects. For example, a car that's very
you want to be able to create variations of objects for example a car that's very
fuel efficient or a car that is less so. In Java you use constructors to
fuel-efficient or a car that is less so in Java you use constructors to
initialize objects, here is an example. In the body of the constructor we
initialize objects here is an example in the body of the constructor we simply
simply initialize the instance variables. The first two here are set to a
initialize the instance variables the
constant value. When a car is first created, it has not driven any miles and
first two here are set to a constant value when a car is first created it has
its tank is empty. This instance variable is set to a parameter, and that
not driven any miles and it's tank is empty this instance variable is set to a
allows you to construct cars with different properties. Here, we construct a
parameter that allows you to construct cars with different properties here we
car with 60 miles per gallon. The value 60 is passed into the parameter
construct a car with 60 miles per gallon the value 60 is passed into the
variable. And is then set the instance variable here. Over here we construct a
parameter variable and is then set to the instance variable here over here we
car with 5 miles per gallon and again, the 5 is passed into the parameter
construct a car with five miles per gallon and again the five has passed
variable. And then used to initialize this instance variable. A couple of
into the parameter variable and then used to initialize this instance
things to pay attention to, when you define the constructor, note the name.
variable a couple of things to pay attention to when you define a constructor note the name it's the same
It's the same as the class name. The class is called car, the constructor is
as the class name the class is called
called car. Also note that there's no return type at all not even void. The
car the constructor is called car also note that there's no return type at all not even void the constructor is not a
constructor is not a method. It does not return any value. Instead the job of
method it doesn't return any value
constructor is just to initialize the instance variables. You can have more
instead the job of a constructor is simply to initialize the instance
than one constructor and you'll get a change to write one right now. Here is
variables you can have more than one constructor and you'll get a chance to
our constructor in BlueJ, you see the statements that we had just before,
write one right now here is our constructor in bluej you see
together with a couple of statements that set's the car's picture. Now this
the statements that we had just before together with a couple of statements that set the car's picture now this
constructure always takes the same picture to construct the car. It would be
constructor always takes the same picture to construct a car it would be
much nicer if we could choose a different picture for every car, so let's do
much nicer if we could specify a different picture for every car so let's
that. I'd like you to write another constructure that takes two arguments, the
do that I'd like you to write another constructor that takes two arguments the
fuel efficiency and the picture file to be used. Go ahead and do that in the
fuel efficiency and the picture file to be used go ahead and do that in the
coding environment and submit your answer.
coding environment and submit your answer
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