Stream groupingBy | Level Up Lunch
In java 8 the idea of grouping objects in a collection based on the values of one or more of their properties is simplified by using a Collector. A collector is another new interface introduced in Java 8 for defining how to perform a reduction operation on a stream and with the functional nature allows you to achieve a grouping with a single statment. It might even spark debates with your DBA for control or their lack of understanding. Should it happen in code or in the database? In the example below, we will peform a number of group by statements to show the simplicity and flexibility of the interface.
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