Collectors.groupby example : How to do group by in java

Last updated on March 19th, 2017 at 08:31 pm

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We have already seen some examples on Collectors in previous post.  In this post, we are going to see Java 8 Collectors groupby example. Groupby is another feature added in java 8 and it is very much similar to SQL/Oracle.
Lets understand more with the help of example: Lets create our model class country as below:

Lets create main class in which we will use Collectors.groupBy to do group by.

When you run above class, you will get below output:

Reference: 
https://docs.oracle.com/javase/8/docs/api/java/util/stream/Collectors.html

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