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Well done!
You have completed Java Basics (2014)!
You have completed Java Basics (2014)!
Preview
In 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.
Additional Info
- The official Mad Libs site. Download the app!
- A Stack Exchange article about logic on the command line.
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[MUSIC]
0:00
Now that we know how to take input and
output it into our formatted text,
0:04
we're ready to get started on
this MadLibs like program.
0:08
By the end of the stage,
we'll have a working prototype.
0:12
First, let's review the main
concept of this program.
0:16
The way Mad Libs works in real life
is two people get together and
0:19
one of them has a book.
0:23
Each page of the book has a story that
has blank lines that have types of words
0:24
such as adjective, noun, verb, etc.
0:29
The narrator asks the person for
each of those types of words and
0:32
fills in the blanks with the word that
was suggested by the other player.
0:35
The story is then read with the new
words in it and hilarity into it..
0:39
So we can do that right.
0:43
No problem.
0:45
Now one thing I want to show you is
how to include more than one variable
0:46
into a formatted string.
0:49
Are you ready?
0:51
Let's dive back into work spaces.
0:52
We're going to launch a new
workspace with a new starting point.
0:54
Now don't worry.
0:57
Your work from the previous day stage is
saved and you can get back to it later.
0:58
Please click the Launch Workspaces button.
1:01
All right,
I've added a new starter file for
1:04
you that has a new starting point or
boilerplate that we're going to be using.
1:06
I've named the program TreeStory.
1:10
So let's open up TreeStory.java.
1:12
The first thing I wanna show you right
off about here is a multiline comment.
1:16
When you wanna group a section of comments
together, you can work a whole block of
1:21
comments by surrounding them using
a forward slash and then an asterisk.
1:24
And then you end that, when you're done
with your comments, with an asterisk and
1:29
then a forward slash.
1:32
I have left us some notes here about
1:33
parts of speech in case it's been awhile
since we thought about that sort of stuff.
1:36
So like I said, because there's going
to be multiple blanks to fill and
1:39
we're going to need to learn how to insert
multiple variables into our format string.
1:42
Well this turns out to be super easy.
1:46
So first we need to gather a couple
of variables like we did before.
1:49
Let's grab their name.
1:52
So again, to do that
1:53
they say we declare a variable
string name equals console.readline.
1:55
And then we put in what we're looking for
enter your name.
2:00
Put a couple spaces.
2:06
And then of course the semi-colon,
2:08
then we need to do the same thing for
the adjectives.
2:11
So we say String, it's a String adjective.
2:13
You know what,
why don't you pause the video or air and
2:15
see if you can finish the rest of the line
and then un-pause it and check and
2:19
see if what you got was
the same as what I did.
2:22
Sound good?
2:24
Okay.
So I'm going to write equals console.readLine,
2:26
enter an adjective.
2:30
And I get only a couple spaces.
2:34
The printf method on console
takes multiple parameters.
2:39
I had stated before the arguments
are separated by commas.
2:42
So let's take a look at
what this might look like.
2:44
So we'll start with our
usual console.printf and
2:47
we'll pass it the string, %s.
2:53
Is very %s.
2:56
And so the first %s
there is gonna be our name.
3:01
And the second one that we
want to do is the adjective.
3:03
So again it will be
name is very adjective.
3:07
All right let's give that a go.
3:11
One trick I wanted to show
you while we’re here,
3:13
you might not know while it’s
on the command line yet.
3:14
But if you do each command, and
then follow it with double ampersands,
3:16
they run in order until one fails.
3:20
So since we keep typing in
the same thing, let's just type that
3:23
on some one line.
3:25
Let's try it.
3:26
So when I say clear and we're gonna do
the compiler which is javac and the name
3:29
of the program which is Tree Story that
Java their way to do another and then do.
3:35
Okay, so again, so what's going to
happen is it's going to run clear and
3:45
if that works.
3:49
It's going to run the compiler and if
that works then it will run the program.
3:50
One thing to do,
always gotta remember to save.
3:54
So it's saved.
3:58
Here we go..When I press enter there we
go, it cleared the screen it compiled and
3:59
now it's running the program so we're
going to enter your name and say Dave.
4:04
Smart.
4:08
Dave is very smart.
4:10
Now having learned how to add multiple
variables to a format string,
4:13
I'm pretty confident that
you have all the skills
4:17
that you'll need to complete
our tree story prototype.
4:20
Now before we kick off and start
building out our own story templates.
4:23
I thought we'd swing over to an exercise.
4:27
And after you ace that one,
4:29
let's talk quickly about what
to do when you encounter errors.
4:31
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