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Welcome to Part four.

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Now we're going to modify our threads to invoke future tasks instead of renewables because their own

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method inside of a renewable is void, which means whatever value gets returned from average, it's

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going to get swallowed into void into our workaround was to store this return value in a class level

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variable before it gets swallowed.

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But that's not really best practice.

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Instead, what we want to do is have our thread execute a callable which holds on to the final value.

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So here what we can do is say future task.

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We expect a double to be returned.

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Future.

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Is equal to a new future task.

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That expects a callable.

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Here we can pass in our future task.

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And we can repeat this.

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Three more times it seems to.

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And three, call this future two or three.

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Future three.

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Thread for.

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And future for the Red five.

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This is going to be technology.

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This will be office supplies.

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And here we'd be getting the total average.

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All right, simple enough.

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And now here we can just say.

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Well, our classical variables are furniture, technology, supplies and average, respectively.

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So here we can say furniture is equal to future except.

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Technology is equal to future to don't get.

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Do the same thing for I think it was called supplies.

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Yeah.

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Supplies equals future three, don't get.

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And then we've got.

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Average.

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Is equal to a future for.

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Get.

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On handled exception, type execution exception for the sake of expediency will just catch all exceptions

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in this one block and print the resulting error message.

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And if we run the code.

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Um, yeah, and.

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You get the same results.

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Perfect.