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Hi there.

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This is Diliman Hello and welcome back.

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Let's look at I will which stands for input and output in any software.

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It's very common to read data from some source and also to write some data up to some destination for

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instance as this diagram shows is source or the destination can be a fine which can be on a local machine

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or even on some remote the server.

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In this case you can read something from a file or you can also write something into we are fine example

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we'll be reading some data see us we find are generating a CSP file.

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Which means that you're writing something in DC as we fight it on here to aioli or is simply a software

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component that specializes in doing that reading and writing.

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Similarly when you're interacting with a web service like send rest API you would request some data

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on process response and when requesting data you mean sometimes how to send some data with the API that

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is your right data onto the network which will be passed on to the API server.

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And this gives the rest server who would act as a destination understrapper your server would then send

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some response back in which gives the rest of us or were would also act as its source.

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So the rest of us are is acting as both source and destination.

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And sometimes we have to download webpages for example in our application may want to download all the

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web links in the system so that users can search the contents of those babblings in disguise.

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The remote web server acts as a source.

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In fact run off or project extensions and this chapter is about downloading ramblings.

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So these are some common activities and many times they can be very critical from a business standpoint

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and this chapter is all about how we can read data from such different sources and also how we can write

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data to different destinations.

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Just know that our destination is also referred to as us.

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But as a language we are creating a good I will frame work is very challenging and one reason is due

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to the different types of sources and sinks in one like file network console and so on.

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And second is due to the number of different areas in which we can communicate with these different

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social son.

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For example sometimes you may want to read the dot sequence Cheney and sometimes you may want to read

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that a dot randomly and in some cases you may want to read the data as individual bytes.

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And in some other cases you may want to read them as a group halfbacks Also the data format can be different

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too.

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That is data that can be in binary or in character format.

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I guess this job is a nurse created lots and lots of specialized classes and these specialized classes

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can be combined or changed in different ways.

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And one most common benefit of such a training is to improve the speed in performing input and output

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.

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So there are process which will specifically help in improving speed and you will see how we can use

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them.

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No Djala comes with two sets of packages.

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One is java.io God I will.

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It is referred to as my will and second is gelada.

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And I will which is referred to as new I will doctor I will.

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Was there from the beginning.

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Well and I was introduced in July 4 and in this chapter we will focus only on stream my will as it is

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most commonly used in the future I'm most likely Aard one or two lessons on Jemadar and I will.

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And here are the things we will see in this chapter which fall under stream I will Lytton's my well

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.

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There are two sets of packages.

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The first set of packages is classified as byte strings under use for handling binary data such as images

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.

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And the second set of packages is classified as character streams under use for handling characters

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like Ex-Files under that exploit.

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Each of them separately not within byte streams we will see how we can read and write binary data such

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as images in an efficient way.

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And in the process we will also look at a design pattern called decorator pattern.

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We will also see how we can see you everyday Guler Java objects to disk and how we can read them back

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from the disk and get them to cross streams Vivan see how we can read and write text content in an efficient

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way.

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We will also see how we can collect input from the user through the console.

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That is a command prompt.

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So we will see how we can make our program interact with the user.

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And lots of several demos.

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And most importantly we'll be making few important extensions to our project.

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Now in the current portion of the project most of the data such as user and Marber how been hardcoded

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in jar files but with the new extension liberalitie the same data from text files and other extension

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would be to download ramblings that is good.

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Note that actually the page content of those who blinks and then write them to their desk.

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That way we will see how we can go right back to their desk.

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But before we do any of this we also have a prerequisite Allison caracter in coding and it is the first

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lesson of the chapter understanding Conacher and coding is very important if we want to write programs

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that read and write text.

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So it is a fundamental lesson and if youre not of enough character encoding then you definitely should

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not give this lesson and thats about it.

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So lets go ahead and learn all about performing and put on outworker