Streams was a much needed feature in Java. They revolutionize the way we perform operations in Collections. For examples, now you don’t need to perform multiple for each statements to filter, sort or print elements.
The Streams API ships with all kinds of operations, including the previously described ones, but also map, group, reduce and many others.
Since I’ve started using them, I find it very hard to write code in Java 7 again, without this excelente API. Check out this small video about it:
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