lambda-and-stream

https://z0ltan.wordpress.com/2017/07/11/creating-custom-java-8-stream-collectors/ https://www.nurkiewicz.com/2014/07/introduction-to-writing-custom.html https://github.com/timmyjose-study/custom-stream-collectors-java8 https://easyjava.ru/java/language/java-8-stream-api-chast-shestaya-sobstvennyj-kollektor/ https://dzone.com/articles/do-it-java-8-recursive-lambdas https://dzone.com/articles/walking-recursive-data https://videoportal.epam.com/video/lajpG4RB https://videoportal.epam.com/video/nJLmM9a9 https://dzone.com/articles/functional-interface-and-lambda-expression-in-java https://www.concretepage.com/java/java-8/java-functional-interface https://habr.com/ru/company/luxoft/blog/270383/ https://habr.com/ru/post/224593/ https://habr.com/ru/post/213805/ https://dzone.com/articles/why-we-need-lambda-expressions https://dzone.com/articles/why-we-need-lambda-expressions-0 https://dzone.com/articles/higher-order-functions https://www.ibm.com/developerworks/library/j-java8idioms6/index.html https://marcin-chwedczuk.github.io/java-8-how-to-write-custom-collector https://dzone.com/articles/writing-functional-interfaces