Modificador static en java || Taller 3

Ronald

hace 5 semanas

En este video se explica que es static.

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00:00Hello, welcome to a new video about the stati modifier in Java.

00:08Well, in Java the stati modifier is used to define members of a class, attributes or methods,

00:17that belong to the class itself rather than the object instance.

00:22So what does this mean? That when you create an instance of a class,

00:33that instance, the static attribute or method will belong to the class, not the instance.

00:44So, let's look at it with some examples I have back.

00:49Now, we have a class called car, which has public access modifier with two attributes,

01:03two attributes called brand and another model,

01:10which we have an integer type stati variable called car counter.

01:20And we have the attribute parameterized with two parameters, brand and model,

01:29which is initialized.

01:30And here we see something that is the car counter.

01:38What does this do?

01:39That every time a car object is created, a car instance,

01:46What this will do is increase the car counter variable by one.

01:54What's happening?

01:55That every time a car object is created, what it will do is that this variable,

02:02As it is of all classes, it will show the number of cars that are being created.

02:11So here we're going to do a sample, here we're going to create, here we're going to instance,

02:24let's create a car object, then, car here ready.

02:31So, once that object is created, the counter will increase by one,

02:41This is going to increase by one, because as we can see, we have here the instance where that object was created.

02:52And we can see that every time that car class is instantiated, the car counter is incremented.

03:07So what's going on here?

03:12This method, we have a static method that does not return anything.

03:16What does a static method mean?

03:18A static method, also, is one that is of the class, is of the class, but is not instantiated.

03:30So you don't need to create one, create an instance where it is,

03:37an instance of a class where that method is located so that it can be accessed.

03:42But we can access, access that method directly.

03:48There you can access it without having to create an instance.

03:53And here mark one, because we created a single object.

04:00But if we create multiple objects, here I show you.

04:03The result would be 3.

04:15As we can see, correct.

04:17For that,

04:21Here we have,

04:22Here we have another one,

04:26another example of static methods.

04:28Here we have,

04:30Here we have this class called mathematics,

04:34which contains the operations,

04:37four basic operations,

04:39addition, subtraction, multiplication and division.

04:42What this static method does,

04:45which returns an integer.

04:48And, by parameter,

04:51It needs two parameters,

04:53two integers.

04:54And this is going to return depending on what the method is.

05:00If it is the sum,

05:01returns the sum of these two parameters that we send to it.

05:05So,

05:06as they are static,

05:08it is necessary to create one,

05:11create an object of that class to be able to access its methods.

05:15But,

05:17that already being within the same package,

05:19we can access it

05:21directly.

05:23So,

05:24we make a,

05:27here we will try

05:31how the sum works.

05:36And we access it directly.

05:37And when executing it,

05:39we see that the sum is 5

05:43and everything works correctly.

05:46So

05:51and

05:52and

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