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Java - Code Samples

 Sample 1. Averaging Group By using Java 8

<Collection_Reference>.stream().collect(Collectors.groupingBy(<Class_Name>::<Method_to_get_group_by_element>,
               Collectors.averagingDouble(<Class_Name>::<Method_to_get_element_to_perform_averaging_on>)));

Example -

Get Dept and it's average Salary

list..stream().collect(Collectors.groupingBy(Employee::getDept,
               Collectors.averagingDouble(Employee::getSalary)));

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