Java 8 Flatmap List Of List

Let us consider another example to understand this well. Convert map to list with stream.flatmap(). In java, to convert a 2d array into a 1d array, we can loop the 2d array and put all the elements into a new array;

I am not so familiar with java 8 (still learning) and looking to see if i could find something equivalent of the below code using flatmap. У меня есть следующий код который можно было бы гораздо проще использовать java 8 stream api: Stream map () function is used to transform an input stream to a new output stream by applying a mapper function on each element.

У меня есть следующий код который можно было бы гораздо проще использовать java 8 stream api:

Stream flatmap java list example We would be looking at flatmap method in java 8 streams and optional. A little example, i had to develop as a teaching use case, of how to take a map with integer keys and values with a list as value and find a specific value in any list in the whole map using java streams. Posted on october 2, 2017 | by josedacruz.