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‫Welcome back.

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‫It's challenge time again and I hope you manage to check out the whole inheritance video and understand

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‫what was going on and how to create the post and the image post and how they correlate to each other

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‫so how they are connected to each other.

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‫So that image post is the deriving class and post is the base class.

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‫Because now the little challenge is to create a new class called Video Post, which is a driving class

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‫with the property video URL and length.

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‫So these are unique properties to that video post.

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‫So just imagine we are still in this post type of thing and we have normal posts which are just text

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‫then we have or which can be text but anything else as well.

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‫Then we have an image post which also has an image URL and now what we want to have is a video post

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‫where we actually have a video URL instead of an image URL and also the length of the video.

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‫So these are the information that we want to have about every video post.

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‫So now create the required constructors to create a video post adjusted to string method accordingly,

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‫because we have seen in the image post that the two string method adds some more information based on

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‫the information that was sent here already.

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‫But we want to know even more about the video post than we know about the post.

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‫So the just two string method then create an instance of video post.

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‫So pretty much the same thing as we did here with the image post.

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‫Just create one and then write it onto the console.

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‫So maybe I should add that and use the two string method on it.

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‫Then if you feel like a real challenge, then you can go ahead with the more advanced stuff.

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‫So use a timer and a callback method here.

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‫You can Google it.

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‫You can simply yeah, you can try to do it yourself or you can Google it.

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‫So the idea is that our video post has a method called play and one that is called stop, and when play

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‫is called then they should write the current duration of the video.

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‫So every single second there should be a tick writing at which second of the video we currently are.

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‫And then one stop is pressed, the timer is stopped and there's also a text written stop that and that's

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‫best with double P and yeah, that's pretty much it.

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‫So play the video after creating the instance and pause it when the user presses any key.

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‫Or maybe stop it when the user presses any key.

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‫So by presses any key, I just mean you have a real line there.

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‫So just keep it simple or read key better.

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‫So just keep it simple and that what you see here will help you to create even video players later on.

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‫So that's really just a basic concept and use timers here.

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‫But as I said, this one is the more advanced part.

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‫If you don't feel like doing it or if it's too difficult, then it's fine as well.

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‫You can just check out the video, but I really advise you to check this out because it will teach you

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‫how to use timers and callbacks by just googling it.

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‫And it's best to just try yourself to experience how it's working and then you will definitely remember

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‫it next time you want to use timers.

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‫All right.

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‫So pause the video now and try to do this challenge.

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‫Already.

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‫I hope you tried it.

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‫First of all, we, of course, need a new class.

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‫And it's going to be our video post.

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‫And now that video post should inherit from post.

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‫And here, as I said, we would have a different property or actually two different properties, which

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‫we didn't have before.

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‫And one of them is the video URL protected string video u r URL and it's a get and a set.

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‫Then the same thing with the length protected int length with a capital l, it's best also get and set.

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‫Next we need a constructor, so let's create a constructor here.

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‫Public video post and I'm going to leave it empty again.

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‫The same approach as we had in our image post here where we simply created this empty constructor because

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‫neither constructor calls a base clause.

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‫The one from the post will be called.

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‫So that one here.

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‫So if we have an empty video post, the post method will be called or the post constructor will be called

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‫the default one.

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‫But we also have one where we actually hand over the required information.

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‫So for example, for a video post, what's interesting there, well, it's on one hand the title again

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‫string title, then the username so sent by username, then the URL, string video URL and the bool

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‫is published and even the length.

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‫So in length is also useful here.

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‫All right.

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‫So quite a long constructor in terms of its parameters.

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‫And now we, of course, need to use this dot and of course, this dot get ID or get next ID is going

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‫to be required here as well.

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‫So we want to not create an ID that is already there.

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‫We want to go ahead and use the next ID.

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‫And as you might recall, this get next ID is returning and increased or incremented current post ID,

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‫which is a static variable.

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‫So it's unique for this whole program, which means that it will be overridden with a new value or pretty

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‫much we will simply get the new value and it's always going to be just one ID once.

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‫So each ID is only going to be unique and that's really important here.

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‫Then the title is going to be title and actually we can even go ahead and copy that from here because

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‫it's the same approach.

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‫Right.

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‫And.

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‫We can simply import it here and now we go ahead with our unique URLs.

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‫So property video URL is a member of video post and actually I called it accidentally is published but

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‫it should be as public with your post but not of post.

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‫And that will be this video URL is going to be video URL and this length is going to be length.

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‫So whatever is given over here as the argument should be taken into the object's properties which are

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‫length video URL and of course the one that we inherited from post.

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‫All right, so that's our constructor.

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‫And now we need to have a two string method.

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‫As we said, we would need a specific two string method.

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‫And it's easiest if we just copy it from the image post and we override it again.

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‫So public overwrite string to string.

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‫So we override the method of our post class, which means we override this method here, which again

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‫overrides from system that object.

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‫So that's the beauty about inheritance you can override and override.

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‫So now we have the string format and it might be a little different.

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‫Well, different.

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‫We can decide whether we want that or not.

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‫We could send the length in here or we could leave it as is.

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‫So the only difference would be not the image URL but the video URL are required.

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‫And if you feel like it, you can add the length in here as well.

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‫So if you want to for inform about that.

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‫So maybe let's just do that.

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‫Maybe it's easiest to just do that and that will be for done.

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‫And in here I'm just going to add this dot length and I separate by comma.

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‫So now in order to make it more readable, I'm just going to use a second line here.

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‫All right, so that's our two string method.

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‫And now we can go ahead into our posts or actually in our program class.

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‫And in here we can create a video post.

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‫Video post we're going to call it video post.

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‫One is going to be a new video post and we could go ahead and do like that.

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‫But then it would be an empty post, which is our ID zero post, like this one here, which just has

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‫my first post as info.

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‫It's public and it's by Dennis Panetta, but that's not very interesting.

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‫So we are going to create one with our own unique values which will have a unique ID because we created

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‫it that way.

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‫So we can go ahead and here and I'm going to say this is a failed video and I uploaded it.

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‫So Dennis Panetta uploaded it and you can find it under https video dot com slash fail video or something

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‫like that.

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‫It's just a fake ID or a fake link video dot com slash fail video.

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‫And then as this is too long for one row, I'm just gonna put it over to the next one.

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‫What we need now, if you check it out here, there are two overloads, so let's check out the overloads.

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‫We need to have an additional information about the access or whether it's public or not.

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‫And here we are again, public, and now we need the length.

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‫So let's say this video is 15 seconds long or maybe 10 seconds long.

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‫Ten is fine.

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‫So just make it 10 seconds long.

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‫And now.

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‫That's pretty much it.

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‫So we can already start our program and we should see the information about our video posts.

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‫And of course, the more challenging part is still missing.

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‫So that we are check out my new shoes that images dot com and actually we don't call the method yet

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‫the two string method so maybe we should do that.

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‫And next we need to call this video posts to string method.

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‫All right.

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‫So by the way, if you were wondering video that you can see, there are multiple methods here already.

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‫And we didn't create those numbers.

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‫They were just there.

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‫And that is because we inherit from post, which again inherits from the system that object.

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‫By the way, if you check it out for post one as well, post one dot, you can see those methods there

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‫as well.

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‫So equals get hashCode get type update.

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‫So these methods, they are inherited from the system object class.

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‫All right, so now we have the two string.

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‫So now we of course need to put that into a console right line.

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‫Actually, let's copy this code here and replace image post by video post one.

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‫All right.

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‫And now we can start it and there we are.

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‫So one things for the birthday wishes, then three As you can see, the video post has a different ID

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‫than our image post.

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‫So we have one, three and two.

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‫That is just the order in which we are writing them onto the console.

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‫So if you check it out here at the video post, even though it's created after the image post we printed

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‫out earlier, and that gives us this wrong order if you want.

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‫But the order is not that important if you well, it's based on what you want to show.

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‫So if you want to show the images based on the order that they were created or the posts in general,

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‫based on the order that they were created, or you want to show the latest 1/1, those kind of things,

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‫then the order of course matters.

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‫But in our case it's really good that we have it that way.

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‫So you can see that the ID is set up and at the moment when the object is created, so ID three and

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‫ID two and another at the moment when it is called like here like the two string method.

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‫So if you would like to have the correct.

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‫Order for the order in which they are created would just go ahead like this.

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‫And now we can see one, two and three.

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‫So thanks for the birthday wishes.

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‫Then our image with the new shoes than the fail video by Dennis Panetta.

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‫And as you can see here, the length of ten is sent as well.

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‫All right.

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‫So that was part one.

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‫And now the more advanced challenge, which is to create a timer and a callback method, which is called

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‫every second and should inform us about the duration of the video or the current duration of the video.

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‫And of course, we need to create the fields as required.

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‫So we will need some additional fields in here.

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‫For example, we will need to know at which point in the video we are.

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‫So let's go ahead and actually let's create the fields before the properties.

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‫So here properties and now let's create the memory fields.

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‫And what is going to be a protected boolean is playing that is useful because if a video is playing

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‫then you can pause it.

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‫If it's not playing, then you can stop, start it.

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‫So that's really important.

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‫So if a video is already playing, you wouldn't want to start it playing.

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‫That's why we have this helper boolean here and then we need a protected int cur duration.

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‫It's zero now in order to call the timer.

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‫We create a new method, let's create a public void play method and let's create the stop method as

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‫well.

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‫So public void, stop.

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‫Now, what do we want to do here?

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‫Well, first of all, let's just write something onto the console, like playing.

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‫So we.

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‫Okay.

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‫The play was started or playing.

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‫The video was started.

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‫And in here I want to set the timer.

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‫And first let's create the timer.

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‫So we are going to need a timer here, timer, and I'm going to call it timer.

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‫Now, in order to use timer, we need to use system dot threading.

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‫That's the one that I need using system threading.

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‫And now what we can go ahead and do is to initialize the timer whenever place pressed.

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‫So timer is going to be a new.

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‫Timer.

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‫Timer callback should be the method that is called after.

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‫What we need to state here, which I'm going to just say is no.

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‫So as you can see, you need a timer callback, then you need an object, you need to do time and a

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‫period and the due time is when it should start and the period should be how often should repeat it,

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‫or in which time frame it should be repeated.

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‫So the due time, I'm going to set it as zero and the period is 1000 milliseconds.

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‫So now of course I need to have this timer callback method and I'm just going to go ahead and create

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‫that.

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‫And it should be a private method because I don't want anybody else to call it only this class itself.

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‫So only void video posts should be able to call this timer callback and the timer callback while it

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‫needs an object as its parameter.

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‫And just going to say, oh, I'm going to call it oh, and now I can check if the current duration is

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‫below the length of the video, then I want to go ahead and increase the current duration by one and

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‫display onto the console.

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‫So see w video at 0 seconds like this and then we need to have the current duration.

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‫So what this will do is simply right onto the console.

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‫And now in order to force the garbage collector for this video, we're just going to use GC Dot collection

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‫so that will clean up any mess.

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‫And by the way, else, if the current duration is not below the length, so that means that the video

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‫is over.

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‫We want to call the stop method.

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‫So in here we're just going to call stop.

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‫And now stop needs, of course, to be implemented.

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‫So let's check out what we need in stop console dot right line and this is going to be stopped at and

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‫then we just say at which second we stop the video and I'm going to say courage, duration.

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‫And of course, we need to reset the current duration to being zero and stop the timer and stop the

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‫time.

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‫We call it this post method.

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‫This one just cleans up the timer or stops the timer and resets it.

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‫Now in order to make this even cleaner.

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‫As I said, we have this is playing field and we can use that in our play method.

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‫So we could say only if is playing this false.

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‫So we use the exclamation mark at to start.

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‫Only then I want to do this.

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‫Only then I want to start playing.

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‫Only then I want to initialize the timer.

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‫And if it's not playing, then nothing should happen.

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‫And here we can do the same.

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‫So in the stop method we can check if is playing is true.

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‫So only if the player is playing, we should be able to stop it.

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‫All right.

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‫So that's it for our video post class.

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‫So now we should be able to check it out by going to our program and at one point start creating or

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‫start playing the video.

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‫So what I'm going to do is after I have created the video post, I'm going to play it.

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‫And then as I said, I would like to leave the or let the user actually stop playing the video.

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‫So how do we do that console that read key and afterwards I will call the stop method and in between,

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‫of course I would like to inform the user about what you should do.

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‫So I'm going to use C.W. here, console right line and I'm going to say press any key to stop the video.

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‫All right.

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‫And now we can check it out.

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‫And see whether what we have built there actually works so that we are press any key to stop the video?

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‫As you can see, the video has started and it's running and let's say I want to press any key and actually

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‫I was too slow.

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‫So the video went through and after 10 seconds it stopped.

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‫And why is that?

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‫Well, that's because our video is only 10 seconds long.

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‫So we have this length property, which indicates how long the video is.

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‫So let's say we create a different video and we want this video, or actually we changed the duration

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‫of our video post to just being 5 seconds.

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‫So let's just do that and run it again.

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‫And then you will see after 5 seconds it will stop.

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‫And there we are.

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‫Video finished.

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‫So now let's stop it manually.

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‫Let's run it again.

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‫There we are.

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‫And let's press any key to stop the video.

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‫And it's not working.

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‫And that is because if we check the post Claus is playing is wrong.

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‫And that's why is playing is never true.

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‫So what we need to do here is to set is playing to true, of course.

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‫And the same goes for our stop here.

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‫So we say is playing is false.

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‫All right, so now let's go back here and let's run it again.

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‫And now the video is running and I post it or I stopped it and it says Stopped at four, and we could

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‫even go ahead and change it to stop that 4 seconds like this.

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‫And in order to have more time, as you saw, it was pretty close.

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‫I'm going to give myself 10 seconds again.

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‫So I drag it over.

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‫Here I am and I stop it.

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‫So I pressed the enter key.

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‫Okey dokey.

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‫So that was quite a challenge.

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‫I hope you manage to do that, even the more advanced thing.

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‫But what's really interesting, and I haven't touched upon it too much is this whole timer method.

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‫So if you used it, then you understand what is going on or this time a class.

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‫So there is a class called timer and you can use it in order to use timer methods or in order to use

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‫a timer.

290
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‫So what it does is you go ahead and create a new timer object and you can use a timer callback and the

291
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‫timer callback allows you to be called or to execute some code each time that this duration is over.

292
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‫So each time that the time frame that you assigned here so in my case 1000 milliseconds is over or this

293
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‫period, then this timer callback will be called.

294
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‫So it will be called in my case every single second.

295
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‫That's why it says video at 1/2, 2 seconds and so forth.

296
00:23:06,460 --> 00:23:13,780
‫That's pretty cool because now you can go ahead and create timer based methods or timer based programs

297
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‫pretty much.

298
00:23:14,530 --> 00:23:20,170
‫And you could create a whole timer where the user can play around with and do even more than we just

299
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‫did here.

300
00:23:21,070 --> 00:23:26,350
‫So the general idea is you create a new timer, you create a timer callback, which is this timer callback

301
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‫method which needs an object that's important.

302
00:23:29,200 --> 00:23:34,060
‫And then in here you can go ahead or within the curly brackets, you can go ahead and execute your code

303
00:23:34,060 --> 00:23:35,050
‫regularly.

304
00:23:35,350 --> 00:23:38,620
‫And that will be every so in so many seconds.

305
00:23:38,620 --> 00:23:45,880
‫Then of course, the timer object has, if you look at it, a due time, which you can assign, which

306
00:23:45,880 --> 00:23:49,360
‫is this one here, and a state which you can assign.

307
00:23:49,360 --> 00:23:51,310
‫And I just use the state null.

308
00:23:51,910 --> 00:23:52,510
‫All right.

309
00:23:52,510 --> 00:23:54,070
‫So that was it.

310
00:23:54,250 --> 00:24:01,990
‫And we are going to go ahead and see even more what we can do with inheritance and object oriented programming

311
00:24:01,990 --> 00:24:02,890
‫in the next videos.

312
00:24:02,890 --> 00:24:04,000
‫So see you there.