Modificador de paquete (default) en java || Taller 5

Ronald

En este video se explica el modificador de acceso default en java

Transcript

00:00Hello everyone, in this video we are going to talk about this FAO access modifier or package modifier.

00:08This FAO access modifier has an access level that applies to members of the class

00:16when no explicit access modifier is specified

00:23That means that when we create a variable we are going to create a variable down here.

00:30an integer variable called A

00:34But we assign an access modifier to that variable. In this case, I want it to be public for the other classes.

00:44then I write here PULL

00:45and here we are defining a variable of integer type and that is a public access modifier

00:56But what is the package or FAO access modifier?

01:02is one that does not have an access modifier explicitly specified

01:09In this case we have an example with this class called products

01:17In this product class we have three attributes

01:21one of type string, one of type double and one boolean

01:29with its respective parameterized constructor to initialize the objects

01:35initialize the, to initialize the attributes of this class

01:42and a method that also has FAO access modifier

01:52That is, it does not have an explicit access modifier if it is public, if it is private or if it is protected.

02:00Well then as you can see the attributes and methods up to the constructor

02:10are found with FAO access modifier, package

02:17What are the advantages and disadvantages of having this package modifier or FAO?

02:27Well, one of the first advantages is that it can be accessed from the same class.

02:34from the same package

02:36but the disadvantage is that it cannot be accessed from a subclass

02:42not even outside the package

02:45What does this mean?

02:47that I can access these attributes and these methods

02:53being in that same package where the class is

02:57So if I believe myself

03:00I have a package called company

03:06Within that package is the products class

03:10and another class called test

03:13where the main method is

03:15So here we can see that in product

03:21We create a product object called corn

03:25we create your instance

03:27We initialize it as the product name corn

03:32its price and its stock

03:34but just as we can initialize it

03:38we can access it directly

03:41since we are in the same package

03:44where that kind of product is located

03:47and we can access it through class E

03:56and we can display the information that we assigned here by accessing those variables

04:07As you can see it shows us

04:10the values we had assigned to it here directly

04:15but if we comment on this line

04:18What it will show us are the values that we passed to the constructor

04:24so if we comment on them

04:27once commented

04:32we go back and execute

04:34will not show us this anymore

04:36but this

04:37and here it is

04:39if we go to another class

04:43outside the package

04:46we try to create

04:48an instance

04:49of the class

04:50of the product class

04:52As you can see

04:56when trying to access

04:58to class E

05:00when trying to create an object

05:02product

05:04It marks an error for us

05:06and why it marks us as an error

05:08because

05:09the builder

05:10has access

05:12from FAO

05:13which means that

05:16can only be accessed

05:18from their own class

05:20and within the same package

05:22but outside the package

05:24cannot be accessed

05:26and within the same package

05:28of the class

05:29and inside the package

05:31about the class

05:32because

05:32can be accessed

05:33from their own class

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