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Multiple Strings
4:34In this video, we will expand on what we've learned to allow to prompt for multiple variables and use them in a single formatted String.
[MUSIC]
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Now that we know how to take input and
output it into our formatted text,
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we're ready to get started on
this MadLibs like program.
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By the end of the stage,
we'll have a working prototype.
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First, let's review the main
concept of this program.
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The way Mad Libs works in real life
is two people get together and
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one of them has a book.
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Each page of the book has a story that
has blank lines that have types of words
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such as adjective, noun, verb, etc.
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The narrator asks the person for
each of those types of words and
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fills in the blanks with the word that
was suggested by the other player.
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The story is then read with the new
words in it and hilarity into it..
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So we can do that right.
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No problem.
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Now one thing I want to show you is
how to include more than one variable
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into a formatted string.
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Are you ready?
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Let's dive back into work spaces.
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We're going to launch a new
workspace with a new starting point.
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Now don't worry.
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Your work from the previous day stage is
saved and you can get back to it later.
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Please click the Launch Workspaces button.
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All right,
I've added a new starter file for
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you that has a new starting point or
boilerplate that we're going to be using.
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I've named the program TreeStory.
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So let's open up TreeStory.java.
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The first thing I wanna show you right
off about here is a multiline comment.
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When you wanna group a section of comments
together, you can work a whole block of
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comments by surrounding them using
a forward slash and then an asterisk.
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And then you end that, when you're done
with your comments, with an asterisk and
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then a forward slash.
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I have left us some notes here about
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parts of speech in case it's been awhile
since we thought about that sort of stuff.
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So like I said, because there's going
to be multiple blanks to fill and
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we're going to need to learn how to insert
multiple variables into our format string.
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Well this turns out to be super easy.
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So first we need to gather a couple
of variables like we did before.
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Let's grab their name.
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So again, to do that
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they say we declare a variable
string name equals console.readline.
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And then we put in what we're looking for
enter your name.
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Put a couple spaces.
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And then of course the semi-colon,
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then we need to do the same thing for
the adjectives.
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So we say String, it's a String adjective.
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You know what,
why don't you pause the video or air and
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see if you can finish the rest of the line
and then un-pause it and check and
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see if what you got was
the same as what I did.
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Sound good?
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Okay.
So I'm going to write equals console.readLine,
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enter an adjective.
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And I get only a couple spaces.
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The printf method on console
takes multiple parameters.
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I had stated before the arguments
are separated by commas.
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So let's take a look at
what this might look like.
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So we'll start with our
usual console.printf and
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we'll pass it the string, %s.
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Is very %s.
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And so the first %s
there is gonna be our name.
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And the second one that we
want to do is the adjective.
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So again it will be
name is very adjective.
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All right let's give that a go.
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One trick I wanted to show
you while we’re here,
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you might not know while it’s
on the command line yet.
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But if you do each command, and
then follow it with double ampersands,
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they run in order until one fails.
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So since we keep typing in
the same thing, let's just type that
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on some one line.
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Let's try it.
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So when I say clear and we're gonna do
the compiler which is javac and the name
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of the program which is Tree Story that
Java their way to do another and then do.
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Okay, so again, so what's going to
happen is it's going to run clear and
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if that works.
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It's going to run the compiler and if
that works then it will run the program.
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One thing to do,
always gotta remember to save.
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So it's saved.
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Here we go..When I press enter there we
go, it cleared the screen it compiled and
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now it's running the program so we're
going to enter your name and say Dave.
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Smart.
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Dave is very smart.
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Now having learned how to add multiple
variables to a format string,
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I'm pretty confident that
you have all the skills
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that you'll need to complete
our tree story prototype.
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Now before we kick off and start
building out our own story templates.
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I thought we'd swing over to an exercise.
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And after you ace that one,
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let's talk quickly about what
to do when you encounter errors.
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