Feature#1

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victortwin wants to merge 3 commits intojava-online-course:masterfrom

victortwin:feature

Commits on Dec 3, 2019

implement SimpleTextStatisticsAnalyzer
victortwin
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Commits on Dec 4, 2019

use frequency() and anonymous class
victortwin
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Commits on Dec 5, 2019

implement Stream-based methods
victortwin
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