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OK.

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Finally let's get back to our project and let's make some extensions.

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I think it's been a while.

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So it's time for us to extend our project.

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So we're going to get to some of the stuff we have learned in the previous lesson.

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And the main thing that we are going to test is how to read data from that text in an efficient way

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.

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So that's what we learned in the previous lesson.

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Now we are going to test that.

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Now if you recall we had this class data stores which was acting as a database and all the data was

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hardcoded here in this class.

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Ok here you are.

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Here we are.

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For example here we have the user data and we hardcoded it.

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And similarly if you go down we had babblings.

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And further down we had movies and books.

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So all of that it was hardcoded.

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So we were not using a database.

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So we had to rely on this class to provide that data.

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Now what we're going to do is we're going to move all of this data into files okaying or text files

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and we are going to read from that.

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So that's going to be a nice extension.

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So you're going to do that.

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And if you'll recall when we created this class we also created these four classes that text files that

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you'll see here book more we use it on babbling.

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They actually had that data with them.

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Of course we did not use any of those files but we just use the data from that.

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So but now we're going to use the files.

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OK.

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And the data that you'll see here is the data that we have here we simply copied the data and do these

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files and we just hardcoded them.

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So now we are going to remove all of this we are going to delete all of this and we are going to simply

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read from the file.

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So I wanted to read in the code.

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So you're not going to write any new code here.

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And in fact we have already seen the code and then the last lesson.

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So we are just going to review the code that has already been written.

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So it's it's the exact same code.

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So we don't have to write it again.

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So let's just go ahead and let's just look at the code.

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So if you recall this is the project really all I want is another project which is for our demo classes

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the classes that we use for demoing our concepts.

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So it really is a project that we created.

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And we had all these packages here and I have created a new package called as you can see this com semantic

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script through Leo and UKL and biton the utile class.

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I created this class called Sauti within the package I created this class called.

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I will you can.

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So you would how all utility classes.

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OK.

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Any utility classes that we are going to create will go into this package.

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So the first one that we have created is all your data.

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Ok I can hear how to read motard so that we can read data from these files undertreatment there has

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two parameters.

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One is data string array.

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Another is filename.

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OK so in a given invocation we would pass the final one off the filenames and we will read the data

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into this string at it.

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So it's kind of similar to the read method that we have seen in the reader class where we were passing

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a character characters.

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OK.

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So it's exactly identical to that.

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So in this case we would read for example for instance if we passed the user filename then we would

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use this data on each element in the idea would be filled up.

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One of the lines on these lines here that it is operated by DAPs.

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So in this case the array size would be fine by the time we read all of this the size of the string

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array would be fine.

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So each element in that it would store a single line.

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So here.

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So as we have as you can see here is a file name we are creating a file input stream object and we are

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chaining it to input stream reader or an input stream reader also has another parameter which is a character

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sort of it's just the encoding scheme and it is of 8 here and it is in Don't chained to a buffer treater

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for performance.

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OK.

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And this is the third try with the resources Sendak's that we are using here and here is a line and

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here we are reading invoking the read line method.

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We order did ask it and we are invoking it on the radar object on that line and we are storing that

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line in this Are called data and we are incrementing on the index variable as being incremented here

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.

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So it's initialized to zero and after adding in line it's once again being incremented on whenever we

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reach whenever read Landru dense and then we terminate dunno.

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It means that we have read everything that we need.

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Now here I just have to try I need to add some catch blocks here.

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So here is the first one.

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It says I need to add some exceptions here.

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The catch blocks here.

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So let's just go ahead and say I'd catch Glaus to try.

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So it's going to add to the cache but also on his unsupported and coding exception the other one is

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file not found exception.

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Another one is the last one is Iowa exception.

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Now we don't have those errors anymore here.

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But first let me run this existing file.

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So that's the old version.

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So far everything is running fine.

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So now it's time to commandeers out

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and here it is.

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So this is a new chord.

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So this is a little user's method and that they just are class so it's going to load user data.

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So here we are creating a string instance and we have a total of five users.

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So the size of the string arrays 5 and we are invoking the I will you tell Metford the read method and

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we are passing this data the string array and we are passing the name of the file which is user.

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OK so user has all of this data here.

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So this is the ID field.

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This is the.

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And third one I need to see what that is but this is the first name last name.

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This is the gender under the user type I guess.

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Yeah.

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And this is the password.

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So that's the thing.

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And here we are reading the reader once the data is read.

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We are the next step is to just do whatever we are doing here which is to create user instances and

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store them.

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And this they called us users.

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OK.

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So that's what we are doing here.

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In each iteration we are creating a single user instance on storing it in the users.

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Ari.

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OK.

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So here we are iterating the string array.

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And in each iteration we are going to read a single line that has been read and since it is tabular

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McGirt we are splitting that line.

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We are we are calling it as a roll.

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Each line this is being called as a row and we are splitting it by TAB delimiter but tab delimiter because

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the data is delimited by tabs and so the values get stored here.

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And then the sixth element is actually the gender.

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So we are getting that gender information here.

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So by default we are saying it is male but then if it happens to be F in which case we are reassigning

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it to wit and gendered or female.

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Otherwise we are re-assigning a good transgender and everything is fine here.

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It's a long way.

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The first one the idea is long.

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So we are doing a long Darbar so long to get along well you and everything else is fine.

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So let's just go ahead and run with this first change and everything is fine.

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So let's go ahead and make the second change also.

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And this is for ramblings.

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So here is the blank file.

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And you have this information here and you can ignore the last fill here for all of the bookmarks wabbling

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movie and book.

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There is this thing called the unknown which is which indicates the kid friendly starters but you don't

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have to worry about it for now.

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So

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OK so similarly we are declaring the string here creating the string array and this value is five count

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per type.

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So we are going to have five bookmarks for each type.

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So let's start variable and we are passing this name weblink.

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And the same thing.

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We are simply spreading the values and we are invoking it here.

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Our only thing is the unknown value which you read which I said that we can ignore as being ignored

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here.

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And the same bet movies do.

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So let me comment this out.

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OK.

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So we are passing the movie as a filename here and we are spreading the values.

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Only thing is cast here and diverters.

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So if you go here cast and directors can have multiple values which are supported by commas.

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So this piece of code is taking care of that.

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So we are splitting that into String Array here.

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And we are simply passing those values here.

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Gaston directors are being passed us a string Arrius.

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So that's what movies and the final bonus books.

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So I'm going to upload these three methods three or four methods into a file so you can look at data

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in the resources section.

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So here you are passing book and bookmark count.

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Once again file eins here only the authors can have multiple values.

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So because a book can be written by multiple authors.

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So that's why we are using another split on the fifth the value that is supposed to represent the authors

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.

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So that's about it.

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So we have all of this sort of mirrored around it one more time and everything is running fine.

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It's well-tested so it's running fine.

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So I'm going to just upload those methods.

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This matter I don't have to upload I think you can write it yourself but I might also upload this.

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So that's about it that's how we are going to read data here by chaining multiple training so that's

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the recreative Madden Huynh buffer reader helps in reading it in a very efficient way.

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And we are using UTF 8 here.

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That's about it.

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And thank you