实践
https://objcoding.com/2019/03/04/lambda/
https://developer.ibm.com/zh/articles/j-lo-java8streamapi/
概念以及实践
https://developer.ibm.com/zh/articles/j-understanding-functional-programming-1/
https://developer.ibm.com/zh/articles/j-understanding-functional-programming-2/
https://developer.ibm.com/zh/articles/j-understanding-functional-programming-3/
https://developer.ibm.com/zh/articles/j-understanding-functional-programming-4/
https://developer.ibm.com/zh/articles/j-understanding-functional-programming-5/