If you need to iterate over the elements in a Map in Java 8, this source code shows how to do it:
This approach uses an anonymous function — also known as a lambda — and it’s similar to the approach used to traverse a Map in Scala.
The following complete example shows how to iterate over all of the elements in a Java Map (or HashMap) using both a) the Java 8 style and b) the type of code you had to use prior to Java 8:
As a quick summary, if you needed to see how to iterate over the elements in a Map/HashMap in Java 8, I hope this is helpful.
The author of this article is Alvin Alexander, the original article can be found on https://alvinalexander.com.