#Convert string to list java 8 how to#

This is the standard way to collect the result of the stream in a container like a List, Set, or any Collection. converting a Stream of String to a List of String, or converting a Stream of Integer to List of Integer, and so on. Here are 5 simple ways to convert a Stream in Java 8 to List e.g. Java 8 Stream to List conversion - 5 examples

I would suggest preferring a standard way, which is by using llect() and Collectors class, but it's good to know other ways, just in case if you need it.Īnd, If you are serious about improving Java functional programming skills then I highly recommend you check out the Learn Java Functional Programming with Lambdas & Streams by Rang Rao Karnam on Udemy, which explains both Functional Programming and Java Stream fundamentals in good detail I would have preferred having those methods at least the common ones directly into Stream but nevertheless, there is something you can use to convert a Java 8 Stream to List.īy the way, my research for this task also reveals several other ways to achieve the same result, which I have summarized in this tutorial. ArrayList or LinkedList to get the contents of that Stream. You can also use any List implementation class e.g. Here you will find methods like toList(), which can be used to convert Java 8 Stream to List. Anyway, It seems they did think about this and provided a class called Collector and Collectors to collect the result of stream operations into different containers or Collection classes. Similarly, they could have provided convenient methods like toList(), toSet() into Stream class, but unfortunately, they have not done that. when they introduced Path class in JDK 7, which is similar to java.io.File, they provided a toPath() method to File class. Java has a design philosophy of providing conversion methods between new and old API classes e.g. Though class has toArray() method to convert Stream to Array, but there is no similar method to convert Stream to List or Set.

When you are processing a List using Stream's map and filter method, you ideally want your result in some collection so that you can pass it to other parts of the program.

#Convert string to list java 8 how to#

One of the common problems while working with Stream API in Java 8 is how to convert a Stream to List in Java because there is no toList() method present in the Stream class.