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

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:


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