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Vienneau understand how to read text from a file as well as from the network.

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Next thing to learn is how the can read text.

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Did they use it.

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And does it take cancel reading from console is not that common compared to reading.

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Phylogenic book but still there may be instances where we would need that.

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For example let's say first typing a server using a program.

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Did the java program may take some input from the system admin or the developer.

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And based on the input it may do some preliminary checks on only if all of the checks would succeed

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then the observer would be started by the program.

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So that's just one example.

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And there can be many instances where this might be very useful reading from the Ansal self learned

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about how we can read text that user enters in a console.

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So here we have this new method called Read from standard book as we want to read data from the console

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standard input is basically the console and it is in the eye or Demo class that is in the package.

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OK.

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So here initially we are asking the user to enter first start the next stock in order to continue.

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And we are saying we are using buffered reader and that's because later we will also use a different

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approach to take the input from the console.

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But first let's look at this particular approach.

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And we already discussed it in one of the previous lessons.

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So we are just going to implement the same code here.

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In fact the code is already here and what we're going to do is the user is going to enter the next stock

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.

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But if the user does not enter the tech stock on you if he enters something else then we would prompt

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the user to re-enter the text and we were budak under the user enters the next dock.

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So we use the why loop here for that Ironmen when the user and does the text dock then we would exit

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the while loop.

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OK.

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So here we have the play with resources in packs and we have the normal read button which is a buffer

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reader which is used for performance.

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It is chained to the input stream reader that is don't change to an input stream instance.

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So in this case the input stream instances system.

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And so on is a variable static variable within the system class and that represents an input stream

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instance.

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In this case it represents a console.

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OK under Carter and coding is UTF 8.

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So since this is an input stream instance we can pass system not in our we can pass a file input stream

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or even an input stream that represents a remote host.

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OK we have seen that in the last lesson and once again we are going to use the read line method from

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the buffer reader which gives us a line of text as a string and it is assigned to this variable cardiod

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which is a string.

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And if it is not equal to none and if it is if it not equal stock then it means that we need to prompt

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the user to re-enter the text and that's what it is doing.

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But if the user does start then we would exit the while loop and we would print the next contract.

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So let's just go ahead.

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I'm not on this program.

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OK so it is asking us to enter text.

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So let's just put some random here.

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OK.

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So it's once again asking us to enter the next let's decide which you start and there you go.

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So we are in the next day.

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So that's how you will do it.

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So everything is the same except that we are passing system dot and it's a different source.

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Now there is also another approach to handle this so you can obviously you can definitely use this matter

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but there is also another class which helps us to do it on it's call as the scanner class from Jellico

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Trudel package and it was introduced in giallo file and it can be used for this for doing this.

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So the input to the scanner constructor is System.

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In.

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OK.

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So this is how you would instantiate a scanner and everything else is say we are asking the user to

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enter the text dock and instead of red line we have this medicore next line which would read under data

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the data that is read from the console.

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So this next line method actually blocks under the user enters a text.

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And if it equals start then we are going to exit the loop.

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So let's just go ahead and run this.

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So once again I put some random because store under Reagan and let's just enter start.

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There you go.

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So it's exactly identical to that.

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And the cool thing about Skynet is that

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it's not restricted to just strings.

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For example with buffler reader we were reading on E-Strings But here we can also the token that we

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enter in the console can also be an end or it can also be along so the text that we understand can be

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some primitive also need not be just string.

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So we can also do that.

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So it kind of provides nice convenient methods to extract the text entered as an OK so we can do that

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.

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It can also be done using a buffer reader but in that case we would have to parse the string into and

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put in or do our set.

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So we we would have to use something like an integer Dropbox and method.

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But here it is much more cleaner and the scanner itself provides a method to extract the string as an

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and so let's just go ahead and vote on it again.

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So that's understocked underestimate does asking a store and or some stock good.

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So let's just say one two three.

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And as you can see it's spending this next thanks to you under the code 1.3.

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And there are also methods for like next long necks double and so on.

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You can use that.

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But if you enter at something else like if you're walking next and but if the string happens to be something

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else not on and then it will throw an exception card mis input mismatch exception input mismatch exception

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which is a runtime exception.

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OK.

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So let's also try that.

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Now let me just enter the H.C. as you can see Strawson and put mismatch exception.

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So that's the thing that's there.

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What did you have with the scanner.

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It also uses internally a buffer just like buffer reader.

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But I think the buffer size is smaller.

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That's what I read.

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So that's about scanner and this is a little bit of description from the API itself.

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So it's not simply a scanner.

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OK.

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Parses Remedios and string.

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OK.

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And there is nothing more to it or simply a scanner.

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And the way it works is in this case we passed system not in but we can also pass a string to it or

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lauching for example or it can be a file also because the input parameter is to the constructor as this

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is an input stream.

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So obviously you can pass a file also using the file input stream and it would beg to be taxed on it

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would tokenize the text which means that it would break the text into individual pieces individual words

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and it uses it as a delimiter.

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By default it uses whitespace.

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So that's how it works.

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But you can also pass a different delimiter Also if you want to.

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And and then once you do that you can extract each text using methods like next and our next there is

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also a method called next order if you want the entire line itself because the text might have several

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lines then you would use next line.

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So it is basically used to parse text.

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OK.

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And here let's also try that.

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So we have this text.

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Hello how are you.

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So that's the string.

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So we are invoking a different constructor here and we are just checking if the scanner has another

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token and if it does then we are printing that.

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So we're going to print tokenize and burn this strings up this individual words into that.

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So as you can see it is printing the individual words.

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Hello how are you.

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OK.

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Because it's tokenized using whitespace.

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And that's how it works by default.

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OK.

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So there are also these convenient methods like has Next.

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Next and even all the Remedios all the methods that can extract the primitives next and has a matter

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convenient math associated Metuchen has.

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And it's just going to check if the next book and whether it is an end or not if what it does and if

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it says Yes if it returns a boolean value or group then you can extract.

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It doesn't.

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OK you can invoke this method.

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So it has those convenience methods.

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So you can actually go ahead and use this on anytime you want to parse a text.

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You can think of using a scanner for reading from the console you can use either Gunner or the board

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reader.

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And that's about it.

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You can find the find this good updater.

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I would more and the resources section.

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And thank you and happy coding.