How-to GROUP BY list of objects to map in java?
Problem: You need to group list of objects by field to map by object field. You have list of objects and need to group them by some field and get a Map<Field, List&… »
How-to split (partition) Collection in java?
Problem You have big Collection of objects and would like to partition by NUMBER elements. As a result you'd like to have Collection with Collection, each of them containing NUMBER elements. For example: You have… »