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Step1 stream lambda optional#1

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Woomin-Jeon wants to merge 9 commits intoitaewon-coding-dojo:woomin-Jeonitaewon-coding-dojo/java-ladder:woomin-Jeonfrom Woomin-Jeon:step1-stream-lambda-optionalCopy head branch name to clipboard

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Commits on Jun 25, 2020

• Convert anonymous Class to lambda

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Commits on Jun 29, 2020

• Remove sum methods duplication by using interface

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• Modify anonymous Class to lambda expresstion

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• Modify countWords() by using lambda expression

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• Fill code in sumOverThreeAndDouble method

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• Fill code in printLongestWordTop100 method

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Commits on Jun 30, 2020

• Make ageIsInRange2() method by using Optional

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• Make getUser() by using orElse() method

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• Make of() method by using lambda and orElseThrow()

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