19- Solution- Getting Many Quotes

Jul 04, 2026 01:27 · 4:49 · English · Whisper Turbo · 2 གསལ་བཤད་

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S… Speaker 1 (19- Solution- Getting Many Quotes)

Now that we have built this small piece of functionality,

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S… Speaker 1 (19- Solution- Getting Many Quotes)

we can work on getting quotes from different websites.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So back to our flight service class,

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S… Speaker 1 (19- Solution- Getting Many Quotes)

we have the get quote method.

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Now let's add a method called get quotes.

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So public,

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what should be the return type of this method?

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We want to return a list of completable future of

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quote.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So list of completable

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future of quote.

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Let's import the list class now we call this get quotes Now

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this method should have the knowledge of the websites you want to query So

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let's store them in a list of strings here.

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I'm going to use list of and pass site one site

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two and site three Now for

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each site we should get a quote.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

There are two ways to do this one way is to create a list of

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S… Speaker 1 (19- Solution- Getting Many Quotes)

completable future of quote then iterate over

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S… Speaker 1 (19- Solution- Getting Many Quotes)

these sites,

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S… Speaker 1 (19- Solution- Getting Many Quotes)

get each site for each site,

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call the git quote method and then add the result to our list.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

But there is a better way.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

We can use functional programming techniques.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

We can use the streams API.

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So we're going to get a stream

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from this list and then map each object or

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each string to a completable future of quote.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So we get the site and here we call git quote

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with that site.

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Now, this lambda expression is simply calling a method so we can convert

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it to a method reference.

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That's better.

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Now,

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what is the return type of this map method?

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Take a look.

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we press F1 here.

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So this returns a stream of completable future.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So earlier we talked about intermediate and terminal operations in streams.

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The map method is not going to execute anything.

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It's just going to build a pipeline.

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It's going to build a recipe for us.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So eventually we need to collect the result into a list object.

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So here we call collect and pass collectors

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dot to list.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So this will return a list of completable futures and

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then we'll return it

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from this method.

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Now,

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let's test our new method.

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So we go to our demo class.

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Instead of calling the get quote method,

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we're going to call get quotes.

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Now this returns a list of completable features.

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For each feature,

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we need to consume it and print its result,

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which is the quote object.

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So once again,

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we can use the streams API here.

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We convert this list to a stream and

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then we use the map method.

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So here we should pass a function that takes a completable future of quote

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and return something else.

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So we're going to take a future object and then

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call then accept Now here we need to pass

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a consumer of quote.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So this is where we get the quote object and Print

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it on a terminal.

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So once again,

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we can use a method reference quote double colon to string

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Now, once again,

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we're building a processing pipeline,

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so nothing is going to happen until we use a terminal operation.

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So here we can call collect,

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and then collect the result into a list.

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Now,

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there is something redundant here.

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In our flight service,

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after we call the map method,

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we get a stream.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

We get that stream and then collect the result into a list.

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Now,

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in our demo class,

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S… Speaker 1 (19- Solution- Getting Many Quotes)

once again,

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S… Speaker 1 (19- Solution- Getting Many Quotes)

we get that list and convert it back to a stream.

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This is unnecessary.

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So in this method,

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we don't really need to collect the result into a list.

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Let's delete this line.

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Now we should return a stream of,

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let's import this,

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a stream of completable future of quote.

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Okay.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

Now we don't need this import statement either.

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Good.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

So our method is cleaner.

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We can't even put this on the same line.

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Nice.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

Now back to our demo class.

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S… Speaker 1 (19- Solution- Getting Many Quotes)

We don't need to call the stream method anymore.

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So we get the quotes.

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This will give us a stream of future objects.

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For each future object,

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we'll accept the result and print the code.

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Actually,

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I made a mistake here.

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Instead of calling quote the toString,

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we should call the print line method.

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So we should pass this quote object that we get to the print line method.

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So system .out double colon print line.

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Now,

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let's run our program and see what happens.

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So we're querying all these websites

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at the same time.

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After three seconds, they all respond, beautiful.

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