Boolean - Intro to Java Programming Udacity English English (auto-generated)

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You've been working a lot with and and or now, and the expressions got kind of

you've been working a lot with and and/or now and the expressions got kind

complicated. In fact, so complicated that they've attracted the interest of

of complicated in fact so complicated that they've

mathematicians, such as this stern looking fellow. His name is George Boole.

attracted the interest of mathematicians such as this Stern looking fellow his name is George Boole and he figure

And he figured out the rules for working with conditions that could be true or

out the rules for working with

false. And ever since, that's been called Boolean logic. Now, why do we care?

conditions that could be true or false and ever since that's been called boolean logic now why do we care we want

We want our programs to be simpler to read. And so, when we have a long and

our programs to be simpler to read and

complex condition, such as this one, we might want to put it in a separate

so when we have a long and complex condition such as this one we might want

method. Let's think about what this test here was. This was the test for the s

to put it in a separate method let's think about what this test here was this

flag, where you had a blue square in the middle. And this test you checked, is

was the test for the S flag where you had a blue square in the middle this

our pixel, in the middle. Alright, so if we had a method that could test that,

test you checked is our pixel in the middle all right so if we had a method

we could say, if x and y is in the middle, then we want blue, otherwise white.

that could test that we could say if x and y is in the middle then we want blue

Much easier to read. let's go and write this method. Here it is, isInMiddle,

otherwise white much easier to read let's go and write this method here it is is in middle

takes and x and a y, coordinate. And here, you have the exact same condition

takes an X and an y coordinate and here

that we've had before. And we simply compute, and return that. There's just one

you have the exact same condition that we've had before and we simply compute and return that there's just one catch

catch. We have to specify a return type for this method. And what is this thing

we have to specify a return type for this method and what is this thing

that's being returned? Well it's either true or false. In Java, the type, that

that's being returned well it's either true or false in Java

has two values, true and false, is called, Boolean, in honor, of our friend

the type that has two values true and false is called boolean in honor of our

George. Here it is. So when you have a method, that can return a condition,

friend George here it is so when you have a method that can return a

that's true or false, you declare it as a Boolean method. Then you can use that

condition that's true or false you declare it as a boolean method then you

method inside an if statement just as much as you can use the relational

can use that method inside an if statement just as much as you can use

operator. You would want to do that whenever a condition has become so

the relational operators you would want to do that whenever a condition has

complicated, that you want to put it inside its own method. You can also

become so complicated that you want to put it inside its own method you can also declare variables of

declare variables of Boolean type. Let me give you a quick example. [SOUND].

boolean type let me give you a quick example

I've reimplemented the isInMiddle method to use two Boolean variables. Let's

ivory implemented is a middle method to use two boolean variables let's check it

check it out. The first variable, x in middle, checks where the x is between 1

out the first variable X in middle checks whether X is between one-third

3rd and 2 3rds of the weight. It's said to true if this condition is fulfilled.

and two-thirds of the width it's set to true if this condition is fulfilled or

Or to false if it's not. And similarly. This variable over here, yInMiddle, is

to false if it's not and similarly this variable over here Y

set to true when this condition is fulfilled, and to false if it's not. Why

in middle is set to true when this condition is fulfilled and to false if

might I want to do this? Because each of those conditions is complicated enough

it's not why might I want to do this because each of those conditions is complicated

that by saving it in a variable, it makes the code easier to read. Now over

enough that by saving it in a variable it makes the code easier to read now

here, I say if both of these conditions are fulfilled then the point is in the

over here I say if both of these conditions are fulfilled then the point

middle, so I return the and of these two. Generally, you use a Boolean variable

is in the middle so I returned the end of these two generally you use a boolean

if you want to remember a value that's true of false, so that you can use it

variable if you want to remember a value

later. Sarah has an example of that for you, in a different context.

that's true or false so that he can use it later Sarah has an example of that for you in a different context

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